how to diagnose the fuel pump

How To Diagnose The Fuel Pump Problems?

The prime responsibility of fuel pump is to transfer vehicle's fuel from the tank to engine.

The vehicle may not run properly if the fuel pump fails to deliver the adequate amount of pressurized fuel to the engine.

Low fuel pressure can create many problems inside the engine.

:- Hard starting :- Rough idle

:- Misfire :- engine stalling etc.

Low fuel pressure automatically shuts down the engine

while driving.

It causes starting and driveability problems in the vehicle.

The problematic fuel pump can starve the engine and cause loss of power when the engine is under load or

:-accelerating hard :- driving at high speed etc.

A malfunctioning fuel pump always leads to total disaster of the vehicle.

A faulty fuel pump will create a situation like—it will deliver too much or too little fuel due to the fluctuating pressure and that leads to a

performance issue in the vehicle.

What are the different types of fuel pump found in vehicles?

:- Electrical fuel pump

:- Mechanical fuel pump

What are the common symptoms of the faulty fuel pump?

:- Engine doesn't start ---

This is the most important sign of faulty fuel pump. The

vehicle only revs and don't start.

Except faulty fuel pump, there are various other reasons that affect the no-start symptom vehicle.

:-Fuel pump relay

:-Pump fuse :- Pump wiring circuit

Some other reasons are :- weak pump

:- restricted fuel line :- defective fuel pressure regulator etc.

Engine surging :-

The regular wear and tear can cause the fuel pump to surge.

The surging causes irregular fuel resistance where the pump can't draw enough energy to maintain proper fuel pressure for starting

the vehicle.

Vehicle Loses Power While Accelerating

The vehicle needs more fuel at a time of acceleration and due to the faulty fuel pump, it lacks to maintain

the same need.

This continuous power issue causes the engine to improperly mix the air -fuel and loss of power.

The Engine Sputters at High Speed

This is the early symptom of faulty fuel pump. The vehicle will be normal and steady for first 10miles, then the problems like jerking, sputtering continues for

next half miles before it went to normal again.

If in-case the fuel pump runs and generates adequate pressure but still the vehicle is stalling, then there may be a problem in

other parts.

:- Blown injector fuel :- Bad relay

:- shorter fuel injector etc..

Note :- The fuel pressure should be in between 30-

80psi to start or run a vehicle.

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