Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Pump: Description
Two types of fuel pumps are currently used. Most carbureted gasoline vehicles use an engine-mounted mechanical pump. General Motors diesel models use either a mechanical or electric pump, depending on model, to supply fuel to the injector pump. Gasoline vehicles with fuel injection use an electric pump normally located in or near the fuel tank.
Some models use a low pressure electric pump in conjunction with a high pressure electric pump. Usually one pump will be located in the fuel tank, the other externally. This provides adequate fuel delivery during extreme vehicle maneuvers or steep inclines with low fuel tank levels.
Vehicle manufacturers recommend that the pump be replaced as an assembly if found defective. Check pumps for fuel pressure, volume, and vacuum (suction). DO NOT attempt to overhaul or repair pump assembly. Some pumps will have an extra connection for fuel and vapor return to aid in hot starting and prevention of vapor lock.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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