fuel system cessna 150.pptx

7/27/2019 Fuel System Cessna 150.pptx

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FOR TRAINING PURPOSE ONLY

Revision No :

Issue No :Page No: 3 Subject Code:

Date : 9

Malaysian Institute of Aviation Technology

FUELSYSTEM


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Revision No :


Date : 9


Description

Fuel is gravity-fed from the metal wing tanks,

through a shut off valve and a fuel strainer, to

the carburetor. Positive ventilation is provided

by a vent line and check valve assemblylocated in the left wing tank and a crossover

line connecting the two tanks together. The

vent line from the check valve assembly

extends overboard through the lower wing

skin adjacent to the laft wing strut. A fuel linedrain is located between the shut off valve

and the strainer.


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Date : 9


PrecautionsDuring all fuelling, defueling, tank purging, and

tank repairing or assembly, ground the aircraft to

a suitable ground stake.

Residual fuel draining from lines and hose

constitutes a fire hazard. Use caution to prevent

the accumulation of fuel when lines or hose are

disconnected.Cap open lines and cover connections to

prevent thread damage and the entrance of

foreign matter.


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Figure 1: Cessna 150 fuel system schematic.


7/21Figure 2 : Cessna 150 fuel system


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Date : 9


FUEL TANKS


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Removal & InstallationRemove sump drain plug or valve and drain fuel from applicable

tank.

Remove fuel tank cover by removing attaching screws.

Remove wing root fairings.

Disconnect and plug or cap all fuel and vent lines ffrom tank.Remove fittings as necessary for clearance when removing tank.

Disconnect electrical lead and ground strap from fuel quantity

transmitter.

Disconnect strap securing fuel tank and remove tank. Use care to

avoid damage to protruding firrings and hose connections whenremoving the tank.

To install tank, reverse the preeceding steps. Be sure grounding is

secure.


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Figure 3 : Cessna 150 fuel tank.


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FUEL VENTS


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Checking

Attach a rubber tube to the end of vent line beneath the wing

Blow into tube to slightly pressurized the tanks, if air can be blown

into tanks,vent line is open.

After tank is slightly pressurized, insert end of rubber tube into a

container of water and watch for a contimous stream of bubbles,which indicates the bleed hole in valve assembly is open and

relieving pressure

After completion of step c, blow into tube again to slightly

pressurize the tank, and loosen, but do not remove filler cap on

opposite wing to check tank crossover line. If pressure escapes fromfiller cap, crossover line is open.

Any fuel vent found plugged or restricted must be corrected prior to

returning aircraft to service.


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Figure 4: Cessna 150 fuel vent location.


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FUEL SHUT-OFF-VALVE


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Removal & InstallationCompletely drain all fuel from wing tanks, fuel lines,

strainer and shu off valve.

Remove shut off valve handle

Remove copilots deat and access plate under seat.

Disconnect and cap all fuel lines at shut off valve.

Remove bolts attaching shut off valve and remove valveReverse the proceeding steps for installation. Safety wire

handle in ON position.


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FUEL STRAINER


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Disassembly & AssemblyRemove drain tube, safety wire, nut and washer at bottom of filterbowl, and remove bowl.

Carefully unscrew standpipe and remove

Remove filter screen and gasket. Wash filter screen and bowl

solvent and dry with compressed air.Using new gasket filter screen and top assembly, install screen

and stanpipe. Tighten standpipe only finger tight.

Using all new O-rings, install owl.

Turn shut off valve to ON position, check for leaks and proper

operation

Torque bottom nut to 25-30 lb-in., and safety wire to top assembly

of strainer. Wire must be have right hand wrap, at least 45

degrees.

Connect drain tube.


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Figure 5 : Cessna 150 fuel strainer


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PRIMING SYSTEM

THERMOSWITCHSPOT-TYPE


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Removal & Installation

Disconnect and cap all lines at primer

Unscrew knurled nut and remove plunger frompump body.

Remove pump body from instrument panel.

Prior to installing a primer, check for proper

pumping action and positive fuel shut off valve in

the locked position.

Reverse preceding steps for installation


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Revision No : Page No: 21 Subject Code:


fuel system cessna 150.pptx

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