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Chevrolet/GMC Silverado/Sierra Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.S/Canada-9234766) - 2016 - CRC - 8/13/15

Contents Introduction . . . . . . . . . . . . . . . . . . . . . . 2

Instruments and Controls . . . . . . . . 5

Driving and Operating . . . . . . . . . . . 8

Vehicle Care . . . . . . . . . . . . . . . . . . . . 22

Service and Maintenance . . . . . . . 26

Technical Data . . . . . . . . . . . . . . . . . 30

Index . . . . . . . . . . . . . . . . . . . . . 32


2 Introduction

Introduction

The names, logos, emblems,slogans, vehicle model names, andvehicle body designs appearing inthis supplement including, but notlimited to, GM, the GM logo,CHEVROLET, the CHEVROLETEmblem, GMC, the GMC Truck

Emblem, SILVERADO, and SIERRAare trademarks and/or servicemarks of General Motors LLC, itssubsidiaries, affiliates, or licensors.

For vehicles first sold in Canada,substitute the name “GeneralMotors of Canada Limited” forChevrolet and GMC Motor Divisionwherever it appears in this manual.

This manual describes features thatmay or may not be on the vehiclebecause of optional equipment thatwas not purchased on the vehicle,model variants, countryspecifications, features/applicationsthat may not be available in yourregion, or changes subsequent tothe printing of this owner manual.

Refer to the purchasedocumentation relating to yourspecific vehicle to confirm thefeatures.

This vehicle is designed to operateon gasoline or Compressed NaturalGas (CNG). It will not operate ondiesel or Liquefied PetroleumGas (LPG) fuel.

Keep this manual in the vehicle forquick reference.

Canadian Vehicle OwnersA French language manual can beobtained from your dealer, atwww.helminc.com, or from:

Propriétaires Canadiens

On peut obtenir un exemplaire dece guide en français auprès duconcessionnaire ou à l'adressesuivante:

Helm, IncorporatedAttention: Customer Service47911 Halyard DrivePlymouth, MI 48170USA

Litho in U.S.A.Part No. 23341897 A First Printing ©2015 General Motors LLC. All Rights Reserved.


Introduction 3

Using this SupplementThis supplement containsinformation specific to the uniquecomponents of the vehicle. It doesnot explain everything you need toknow about the vehicle. Read thissupplement along with the ownermanual to learn about the vehicle'sfeatures and controls.

Index

A good place to look for what youneed is the Index in back of thissupplement. It is an alphabetical listof what is in the supplement, andthe page number where you willfind it.


4 Introduction

2 NOTES


Instruments and Controls 5

Instruments andControls

Warning Lights, Gauges, andIndicatorsFuel Gauge . . . . . . . . . . . . . . . . . . . . . 5Malfunction Indicator Lamp . . . . . 6

Information DisplaysDriver InformationCenter (DIC) . . . . . . . . . . . . . . . . . . . 7

Warning Lights,Gauges, andIndicators

Fuel GaugeThe vehicle has a gasoline/CNGfuel gauge.

Metric

English

When the ignition is on, thegasoline/CNG fuel gauge indicatesabout how much fuel is left inthe tank.

When the engine is running, the fuelgauge displays the level for the typeof fuel that is currently being used.The fuel level for the second fuel notbeing used (gasoline or CNG) isdisplayed in the Driver InformationCenter (DIC).

For CNG, the fuel gauge has beencalibrated to display full atapproximately 24 800 kPa(3,600 psig) and empty atapproximately 2 758 kPa (400 psig).


6 Instruments and Controls

CNG fuel gauge readings areaffected by changes in fueltemperature and fuel pressure.

See “Fuel Gauge” in the ownermanual.

MalfunctionIndicator Lamp

The malfunction indicator lamp is inthe instrument cluster.

This vehicle has been specificallydesigned to illuminate this indicatorwhen emissions exceed acceptablelevels while operating on eithergasoline or CNG fuel.

The malfunction indicator lampcomes on to indicate that there is aproblem and service is required.Malfunctions often will be indicatedby the system before any problem isapparent. This system is also

designed to assist the servicetechnician in correctly diagnosingany malfunction.

Caution

If the vehicle is continually drivenwith this light on, the emissioncontrols might not work as well,the vehicle fuel economy mightnot be as good, and the enginemight not run as smoothly. Thiscould lead to costly repairs thatmight not be covered by thevehicle warranty.

This light should come on as acheck to show you it is workingwhen the ignition is on and theengine is not running.

See the owner manual for moreinformation.

CNG Malfunction Indicator

The CNG indicator light on the fuelselector switch in the center stackwill show if the CNG system has anerror. If the light is blinking rapidlyand does not stop, an error hasoccurred. The light will continue toflash rapidly until the problem iscorrected. See your dealer forservice.


Instruments and Controls 7

Information Displays

Driver InformationCenter (DIC)The DIC displays are shown in thecenter of the instrument cluster inthe Info app. A bi-fuel vehicle withthe uplevel cluster will have thefollowing additional DIC info pages.

DIC Info Pages

Fuel Level : While operating onCNG, the gasoline fuel level can beviewed in the DIC.

CNG Fuel Level : While operatingon gasoline, the CNG fuel level canbe viewed in the DIC.


8 Driving and Operating

Driving andOperating

Driving InformationVehicle Load Limits . . . . . . . . . . . . . 8Truck-Camper LoadingInformation . . . . . . . . . . . . . . . . . . . . 8

Starting and OperatingStarting the Engine . . . . . . . . . . . . . . 9

FuelFuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Filling the Tank . . . . . . . . . . . . . . . . . 11Fuel System Leak . . . . . . . . . . . . . 16

TowingTrailer Towing . . . . . . . . . . . . . . . . . . 18

Driving Information

Vehicle Load LimitsPickup Models

{ Warning

Do not remove the CompressedNatural Gas (CNG) fuel tankshield. Things carried in the bedof the truck could shift forwardduring a sudden stop or acollision. The CNG fuel tank couldbe damaged and cause a naturalgas leak. If the gas is,accidentally, ignited, you or otherscould be seriously injured. Makesure things in the bed of the truckare properly secured.

Cab Chassis Models

See the Body Builder Manual atwww.gmupfitter.com for fuel tankcover modification restrictions.

Pickup and Cab Chassis Models

Caution

The CNG fuel tank and/or shieldcould be damaged if objects arestacked on or against the fueltank shield or sit or stand on theshield. Never put anything on oragainst the CNG fuel tank shield.

See “Vehicle Load Limits” in theowner manual for cargo loadinginstructions.

Truck-Camper LoadingInformationPickup Models

The vehicle was neitherdesigned nor intended to carry aslide-in camper.


Driving and Operating 9

Caution

Adding a slide-in camper orsimilar equipment to the vehiclecan damage it, and the repairswould not be covered by thevehicle warranty. Do not install aslide-in camper or similarequipment on the vehicle.

Cab Chassis Models

For incomplete vehicle information,see www.gmupfitter.com.

Starting andOperating

Starting the EngineAlways maintain a minimumgasoline level of at least one-quartertank. To protect engine components,a switch to gasoline may occur atany time. The vehicle will not start ifthe engine stalls due to lack ofgasoline.

FuelIf a fuel leak is suspected, see FuelSystem Leak 0 16.

. Whichever mode is selected, thevehicle always starts ongasoline. When CNG mode isselected, the vehicle willautomatically transition from gasto CNG. Always keep thegasoline tank at leastone-quarter full.

. It is very important not to run thegasoline tank out of fuel. Thesystem will not switch over toCNG operation if the enginestalls while running on gasoline.

. If the vehicle runs out of CNGfuel, it will automatically switchover to gasoline operation. Fornormal CNG operation, fill theCNG fuel storage system untilthe fuel gauge or DIC fuel levelpage displays at leastone-quarter full.



. If it takes unusually long to fillthe CNG cylinder, the fuel fillfilter may be clogged. Contactyour dealer for inspection and/orreplacement.

This vehicle is designed to operateon gasoline or Compressed NaturalGas (CNG) and has a gasoline tankand a CNG fuel storage system.See “Recommended Fuel” under“Fuel” in the owner manual forgasoline information.

The general marketplace fuel qualityof CNG (for motor vehicles) in thestate of California should be incompliance with Title 13 CaliforniaCode of Regulations, Section2292.5. The remaining regions ofNorth America do not employregulated fuel quality standards forgeneral marketplace vehicle usage,however, fuel is available at bothprivate and public filling stations.We recommend use of natural gasfuel from fueling stations designedfor providing fuel for vehicle use.

The main component of CNG ismethane, a highly flammable,colorless gas. An odorant has beenadded for detection through smell.The smell is similar to that of rotteneggs. The CNG in the vehicle isstored under high pressure(maximum 24 800 kPa/3,600 psig).Gas should never be smelled and ahissing sound should not be heard,unless refueling is being done.If gas is smelled or a hissing soundis heard at any other time, shutdown the vehicle and have itserviced. It may be possible to hearthe fuel flowing while the engine isrunning if standing close to thepipework or various fuel systemcomponents (regulator, filter). This isnormal and should not be confusedwith a hissing sound at fittings thatmay indicate a fuel leak. Follow theinstructions under Fuel System Leak0 16.

Fuel Selector Switch

The fuel selector switch is on thecenter stack below the climatecontrols. When the ignition is inON/RUN, pressz to selectbetween gasoline and CNG mode.The operating mode will bemaintained between key cycles. Theswitch also includes the fueloperation indicator light.



The vehicle always starts ongasoline. If the fuel selector switchis in CNG mode when the vehicle isstarted, the vehicle will start ongasoline and switch to CNG whenconditions for CNG operation havebeen met. While waiting totransition, the fuel operationindicator light will be flashing at arate of once per second. If thevehicle is turned off in gasolinemode, when started it will remain ingasoline mode until the fuel selectorswitch is pressed. At temperaturesbelow freezing, it may take 10 to15 minutes for the vehicle to switchfrom gasoline to CNG. If the switchis pressed to go to gasoline fromCNG while driving, the engine willchange to gasoline operation.If operating in CNG mode and theCNG tank is emptied, the vehiclewill automatically switch to gasolineoperation and the indicator light willflash continuously. Pressz to stopthe indicator light flashing. If thesystem transitions more than20 times in a single key cycle, it willremain in the last mode selected.

When the vehicle is heavily loaded,such as when towing a trailer up agrade, it may be prevented fromswitching to CNG. Once the highloads are no longer present, thesystem will switch.

Fuel Operation Indicator Light

The fuel operation indicator lightshows the current fuel mode orindicates a transition between fuels.

. Off: Vehicle is currentlyoperating on gasoline.

. On: Vehicle is currentlyoperating on CNG.

. Flashing Slowly (Once perSecond): Vehicle is awaitingchangeover to selected fuel orhas started the changeover.

. Flashing Rapidly (10 Times perSecond): CNG system error. Seeyour dealer.

Filling the Tank

{ Warning

CNG is flammable and highlyexplosive. You could be killed orseriously injured if leaking naturalgas is ignited. If you suspect aleak, do not start the engine ordrive the vehicle. Have thevehicle immediately towed,inspected, and repaired by anauthorized GM dealer.

Before filling either fuel tank, turn offthe engine.

The gasoline tank is filled throughthe standard fill pipe. See “Fillingthe Tank” under “Fuel” in the ownermanual.



The CNG fill valve is behind the fueldoor on the driver side of the tankshield in the pickup bed.

There is an identifying bluediamond-shaped CNG label on therear of the vehicle. Do not removethis label. This label is necessary for

compliance with NFPA-52regulations. Driving without thislabel may violate the laws orregulations in some states.Replacement labels can be orderedfrom your dealer.

Refueling Procedure

There are two methods of refueling:fast filling or slow filling. Fast fillingis normally used in fuel stations fornatural gas vehicles. It takes aboutsix to eight minutes to fill up the fueltanks. Slow filling is done with avehicle refueling appliance or atime-fill post provided by the fleetoperator. Refueling time variesdepending upon the refuelingsystem used — consult with therefueling station attendant or systemprovider. Always observe all safetyrecommendations and operatinginstructions on the refuelingequipment. When refueling, use afuel fill nozzle that complies withANSI/CSA-NGV 1-2006 standards.Nozzles are designed according totheir maximum fill pressure: P30

(blue handle) for 20 684 kPa(3,000 psig) and P36 (yellowhandle) for 24 800 kPa (3,600 psig).

Refuel with a yellow P36 nozzlewhere available. Using a blue P30nozzle will provide a partial fill only.

During fueling, CNG needs to bedelivered to the vehicle at theappropriate pressure in relationshipto the ambient temperature. Thiscan be done automatically by atemperature compensation systemon the CNG fuel dispenser ormanually by stopping the CNG fill ata recommended pressure. GMrecommends that customers useCNG fueling stations that have atemperature compensation systemwhenever possible. Check with thefuel station. If one is not available,see the temperature compensationchart that follows in this section tochoose the appropriate fill pressurefor the ambient temperature. Inaddition, fill only to the pressurelevel for the lowest ambienttemperature anticipated duringfueling.



Leaving a vehicle connected to aslow fill station can cause the tankto be filled to a higher pressure thanrecommended, especially whenoutside temperatures fluctuate.Disconnect the vehicle from the fillstation as soon as it is full, unlessan auto shutoff feature is used.

{ Warning

If CNG tanks are filled to a higherpressure than recommended andthen exposed to a much higherambient temperatureenvironment, expansion of thegas caused by the temperaturechange may cause pressure reliefdevices on the vehicle CNGtank(s) to release gas, asdesigned. If an ignition source ispresent, this could create a risk offire or explosion. If there is anypossibility that the tank has beenover pressurized, take steps torelieve the excess pressure, suchas by driving or running thevehicle in an outdoor open areato remove some fuel.

Make sure that your CNG vehicle isproperly maintained and repaired toavoid elevated temperaturessurrounding the tank, since elevatedtemperatures in the area of the tankcould also raise the CNG pressurein the tank.

Consult materials availablefrom NGVAmerica -http://www.ngvc.org and the CleanVehicle Education Foundation -http://www.cleanvehicle.org on CNGfueling stations.

Ambient Temperature/MaximumCNG Fill Pressure CompensationChart

To avoid the risk of fire or explosionif an ignition source were present,do not fill above the pressure levelthat corresponds to the lowestambient temperature expectedduring fueling.

Service Pressure 24 800 kPa(3,600 psig) at 21 °C (70 °F).



Depending on CNG fill stationequipment/performanceand environmental conditions,

CNG fill volume will vary.This will affect overall vehiclerange.

{ Warning

Attempting to fill a CNG fuelsystem that has a missing ordamaged O‐ring is dangerous.Natural gas can leak. If thenatural gas is ignited, you orothers could be injured. Replacethe O‐ring before filling the tank.

Put the vehicle into P (Park) andturn off the engine prior to refueling.

Remove the dust cap from thereceptacle, clean off any dirt ordebris on the receptacle, and follow



the refueling instructions on thepump or provided by the stationoperator.

Refueling will stop automaticallywhen the tank is full. Wait for thehigh pressure fuel to be purged fromthe hose before disconnecting. Seethe station operator for informationon how the line is purged. Todisconnect the vehicle from therefueling station, remove the nozzlefrom the fill valve. A hissing soundmay be heard as a small amount ofnatural gas escapes. This is normal.

Put the fill valve dust cap onsecurely and close the fuelfiller door.

If fuel or vapor is heard or seenleaking from the nozzle-fill valveconnection, stop refuelingimmediately. Dirt or other debrismay be preventing a positiveconnection. Turn off the refuelingdispenser, disconnect the nozzle,and inspect the fill valve for amissing, damaged, dirty, or wornO-ring. Reconnect the refuelingdispenser to the fill valve and beginrefueling again. If it continues toleak, replace the fill valve O-ring.

To replace the fill valve O-ring:

1. Carefully remove the O-ringfrom the groove in the fill valve.A small flat-blade or pointedtool can be used.

2. Make sure the groove is cleanand free of dirt and debris.

3. Install the new O-ring in thegroove in the fill valve. Makesure the O-ring is properlyseated in the groove.

If it continues to leak after you havereplaced the O-ring, have anauthorized dealer inspect thesealing O-ring in the fill valve.

If there is dirt or other debris on theinside of the fuel fill valve, gas mayleak out after refueling. If you needto add more fuel, do the refuelingprocedure again.

See an authorized GM dealer forreplacement O-rings.



Pressure Relief Devices

The CNG tank has pressure reliefdevices that are designed to releasepressure if the CNG tank isoverheated or over pressurized.

If a pressure relief device releasesCNG, the CNG tank will be emptiedand will switch to gasoline,if gasoline is available. A loudrushing noise may be heard whenCNG is released.

Fuel System Leak

{ Warning

Fuel vapors and fuel fires burnviolently and can cause injury ordeath.

. Keep all smoking materialsand sources of ignition awayfrom the fuel systemcomponents.

. CNG is non-toxic but thevapors are lighter than airand can cause oxygendepletion if they are

(Continued)

Warning (Continued)

enclosed in a confinedspace. Make sure there isadequate ventilation anduse extreme caution if aleak is suspected.

{ Warning

If you smell a persistent naturalgas odor or hear a continualhissing sound, there could be anatural gas leak. If the natural gasis ignited, you or others could beinjured. Do not start the engine ordrive the vehicle. Have thevehicle towed to an authorizedGM dealer for service.

A slight natural gas odor may bedetected for a few moments afterrefueling. This is normal. You shouldnot be able to smell natural gas atany other time. If you do, or if youhear a hissing sound, the fuelsystem may have a leak.

If natural gas is smelled or a hissingsound is heard:

1. Park the vehicle in awell-ventilated area and applythe parking brake. Keep heat,sparks, and flame away. Openall the vehicle doors forventilation.

2. Turn the ignition to LOCK/OFF.



3. The manual shutoff is near thefuel fill valve on the driver sideof the tank shield in thepickup bed.

A label is on the outside of thevehicle near the manual shutoffvalve. Do not remove this label.

Turn the lever one-quarter turnclockwise to turn off.

Do not drive the vehicle. The vehicleshould be towed to an authorizedGM dealer.

Do not add anything to the vehiclethat will cover the CNG fuel storagesystem or restrict access to themanual shutoff valve. SeeAccessories and Modifications 0 22.



Towing

Trailer TowingFor more information, see “TrailerTowing” in the owner manual.

Weight of the Trailer

How heavy can a trailer safely be?

It depends on how the rig is used.For example, speed, altitude, roadgrades, outside temperature, andhow much the vehicle is used to pulla trailer are all important. It candepend on any special equipmenton the vehicle, and the amount oftongue weight the vehicle can carry.

Maximum trailer weight is calculatedassuming only the driver is in thetow vehicle and it has all therequired trailering equipment. Theweight of additional optionalequipment, passengers, and cargoin the tow vehicle must besubtracted from the maximum trailerweight.



Use the following charts to determine how much the vehicle can weigh, based upon the vehicle model and options.

Vehicle Axle Ratio Maximum Trailer Weight GCWR*

2500 Series 2WD Regular Cab

Long Box 3.73 4 400 kg (9,700 lb) 7 530 kg (16,600 lb)

Long Box with UB7 3.73 4 400 kg (9,700 lb) 7 530 kg (16,600 lb)


2500 Series 2WD Double Cab

Standard Box 3.73 4 264 kg (9,400 lb) 7 530 kg (16,600 lb)




2500 Series 2WD Crew Cab



























*The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle andtrailer including any passengers, cargo, equipment, and conversions. The GCWR for the vehicle should not beexceeded.


22 Vehicle Care

Vehicle Care

General InformationAccessories andModifications . . . . . . . . . . . . . . . . . 22

Vehicle ChecksDoing Your OwnService Work . . . . . . . . . . . . . . . . . 23

Fuel System Components . . . . . 23

Electrical SystemFuses . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Jump StartingJump Starting - NorthAmerica . . . . . . . . . . . . . . . . . . . . . . 25

Appearance CareExterior Care . . . . . . . . . . . . . . . . . . 25

General Information

Accessories andModifications

{ Warning

Installing an aftermarketaccessory may damage thevehicle. Never install anaccessory that will restrict orprohibit access to the manualshutoff valve or the CNG fuelstorage system. Never install anytype of cover over the CNG fuelstorage system that may trapCNG fumes.

Adding accessories or makingmodifications to the vehicle,including to the CNG tank shields,could cause a malfunction ordamage and would not be coveredby the vehicle warranty.

{ Warning

To avoid damage to any fueltanks and reduce the risk ofexplosion, tank shields must bepresent. Do not drill, modify,attach accessories, or use shieldsas a work surface. Do not use firenear shields or tanks.

If a CNG tank needs service orrepair, have only a qualifiedtechnician perform the work. See“Accessories and Modifications” inthe owner manual.


Vehicle Care 23

Vehicle Checks

Doing Your OwnService Work

{ Warning

Never try to do your own servicework on the Compressed NaturalGas (CNG) fuel system. The CNGfuel system operates under highpressure. You can be injured andthe vehicle can be damaged ifyou try to do your own servicework. Service and repair of thissystem should only be performedby a qualified dealer.

Fuel System Components

{ Warning

Tampering with, or improperlymaintaining the high-pressure fuelsystem can cause a dangerouscondition in which serious injuryor death may result. Neverattempt to modify the fuel system,and always have the fuel systemrepaired and maintained by aqualified dealer.

CNG fuel system componentscomply with appropriate safetystandards. These component partshave been designed and approvedfor use in a CNG vehicle. Nevermodify or replace any original CNGcomponents or parts with thosespecified for a gasoline-poweredvehicle. Improper parts orcomponents can damage thevehicle fuel system and affect thevehicle safety and performance.

Do not modify, tamper with,or perforate the tank shield.Damage to the fuel system canresult.


24 Vehicle Care

Manual Shutoff Valve

Locate the manual shutoff valve sothat it can be found quickly if it isneeded.

The manual shutoff valve is near thefuel fill valve on the driver side ofthe tank shield in the pickup bed.

A label is on the outside of thevehicle near the manual shutoffvalve. Do not remove this label.

To turn off the valve, turn the leverone-quarter turn clockwise. Turn itcounterclockwise to turn the valveback on.

Turn off the valve if a fuel leak issuspected or if the vehicle isinvolved in an accident. This valve,when turned, will stop CNG flow tothe engine. If the vehicle has justbeen in storage and it will not switchover to CNG operation, verify thatthe valve is turned to the onposition.


Vehicle Care 25

Electrical System

Fuses

Fuse Location

The bi-fuel system has two fusesthat are part of the enginecompartment wiring harness. Bothfuses are in a plastic holder that ismounted inside the enginecompartment, near the accessorybattery tray.

Jump Starting

Jump Starting - NorthAmerica

{ Warning

If the CNG fuel system has aleak, a spark from the jumpercables could ignite the naturalgas, causing injury or death. Donot jump start the vehicle if yousmell a persistent natural gasodor or hear a continual hissingsound. Close the manual shutoffvalve, and have the vehicle towedto an authorized GM dealer forservice. See Fuel SystemComponents 0 23.

See “Jump Starting – NorthAmerica” in the owner manual.

Appearance Care

Exterior Care

Finish Damage

{ Warning

Heating the vehicle to above82 °C (180 °F) may damage theCompressed Natural Gas (CNG)tanks and may cause the fuelpressure relief device to open andrelease CNG. If an ignition sourceis present, this could create a riskof fire or explosion.

CNG tank(s) must be drained bya qualified technician prior to heatcuring a painted body repair.


26 Service and Maintenance

Service andMaintenance

Maintenance ScheduleMaintenance Schedule . . . . . . . . 26

Maintenance RecordsNatural Gas Vehicle (CNG)Service Records . . . . . . . . . . . . . . 28

MaintenanceSchedule

{ Warning

The tank shield protects the fueltank in a crash and from roadhazards. Operation with the shieldremoved may result in tankdamage that could result in arupture or possible explosion ofthe tank. You or others could beinjured or even killed. If you mustremove a tank shield for anyreason, e.g., tank inspection orvehicle repair, always reinstall theshield before operating thevehicle.

{ Warning

Keeping a CNG fuel tank inservice after the tank serviceexpiration date is dangerous andis prohibited by federal law. Thetank may no longer withstand the

(Continued)

Warning (Continued)

CNG fuel system operatingpressure. You could be severelyinjured or killed. Take the vehicleto an authorized GM dealer tohave the tank replaced.

See instructions on fuelcontainer for inspection andservice life.

This CNG vehicle is designed forroutine maintenance (fluids, filters,etc.) according to the originalspecifications as provided in theowner manual for gasoline fuelvehicles. See the owner manual formaintenance service intervals andfluid specifications.

See your dealer or other qualifiedrepair facility for required serviceand maintenance. Your dealer hasthe necessary training and parts torepair the vehicle.


Service and Maintenance 27

In addition, the CNG systemrequires the following every60 000 km (37,500 mi) or36 months, whichever occurs first:

. Visual inspection of the CNGfuel tanks by a CSAInternational-certified inspectoror authorized GM dealer. Formore information, see yourdealer or see:

http://www.csa-international.org

{ Warning

The CNG fuel system and tank(s)must be inspected by a certifiedinspector if the vehicle is involvedin a collision or fire.

The fuel tanks must be replaced15 years after manufacture. Theexpiration date of the fuel tanksis on a label on the fuel tanks.Have an authorized GM dealerreplace the fuel tanks. Do notreuse old fuel tanks.

. Replacement of the highpressure CNG filter. See yourdealer.

. If there are cuts or corrosion inthe flex line jacket, replacethe line.


28 Service and Maintenance

Maintenance Records

Natural Gas Vehicle (CNG) Service RecordsVehicle Identification Number (VIN)

CNG Tank Information

Vehicle Size Capacity* Serial # Exp. Date

Pickup533 mm x 1 327 mm

(21 in x 52 in)210 L

(55.5 gal)

Chassis Cab 635 mm x 1 327 mm(25 in x 52 in)

292.8 L(77.3 gal)

* Total Container Water Volume


Service and Maintenance 29

CNG Fuel Tank Inspection Record

Tank Serial Number: Tank Expiration Date:

Inspection Interval(Mileage or Years)

Inspection Date Inspector Inspector Initials Type of Repair

15 Years N/A N/A N/A Tank Exchanged


30 Technical Data

Technical Data

Vehicle DataCapacities andSpecifications . . . . . . . . . . . . . . . . 31


Technical Data 31

Vehicle Data

Capacities and Specifications

Application Total Capacities

Canada U.S.

CNG Fuel Tank Capacity ¹

Pickup 15.3 GGE200 Bar @ 15 °C

17.6 GGE3,600 psi @ 70 °F

Chassis Cab21.5 GGE

200 Bar @ 21 °C24.6 GGE

3,600 psi @ 70 °F

¹ GGE (Gasoline Gallon Equivalent)


32 Index

Index AAccessories and Modifications . . . 22Appearance CareExterior . . . . . . . . . . . . . . . . . . . . . . . . .25

BBattery - North America . . . . . . . . . . 25

CCalifornia Proposition65 Warning . . . . . . . . . . . . . . . . . . . . . 25

Canadian Vehicle Owners . . . . . . . . 2Capacities and Specifications . . . . 31CheckMalfunction Indicator EngineLight . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

CleaningExterior Care . . . . . . . . . . . . . . . . . . .25

ComponentsFuel System . . . . . . . . . . . . . . . . . . . .23

DDriver Information Center (DIC) . . . 7DrivingVehicle Load Limits . . . . . . . . . . . . . . 8

EElectrical SystemFuses . . . . . . . . . . . . . . . . . . . . . . . . . .25

EngineCheck and Service EngineSoon Light . . . . . . . . . . . . . . . . . . . . . 6

Starting . . . . . . . . . . . . . . . . . . . . . . . . . . 9

FFuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Filling the Tank . . . . . . . . . . . . . . . . . 11Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Fuel System Components . . . . . . . 23Fuel System Leak . . . . . . . . . . . . . . . 16Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

GGaugesFuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

IIntroduction . . . . . . . . . . . . . . . . . . . . . . . 2

JJump Starting - North America . . . 25

LLampsMalfunction Indicator . . . . . . . . . . . . 6

LeakFuel System . . . . . . . . . . . . . . . . . . . .16


Index 33

MMaintenance Schedule . . . . . . . . . . 26Malfunction Indicator Lamp . . . . . . . 6

NNatural GasVehicle Service Records . . . . . . . .28

Natural Gas Vehicle (CNG)Service Records . . . . . . . . . . . . . . . 28

PProposition 65 Warning,California . . . . . . . . . . . . . . . . . . . . . . . 25

SServiceAccessories andModifications . . . . . . . . . . . . . . . . . .22

Doing Your Own Work . . . . . . . . . .23Engine Soon Light . . . . . . . . . . . . . . . 6

Service and MaintenanceNatural Gas Vehicle (CNG)Service Records . . . . . . . . . . . . . .28

Specifications and Capacities . . . . 31Starting the Engine . . . . . . . . . . . . . . . 9SupplementUsing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

TTowingTrailer . . . . . . . . . . . . . . . . . . . . . . . . . .18

TrailerTowing . . . . . . . . . . . . . . . . . . . . . . . . . .18

Truck-Camper LoadingInformation . . . . . . . . . . . . . . . . . . . . . . 8

UUsing This Supplement . . . . . . . . . . . 3

VVehicleCanadian Owners . . . . . . . . . . . . . . . 2Load Limits . . . . . . . . . . . . . . . . . . . . . . 8

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