Skip the auto shop - Our mechanics make house calls

Q: No power to the fuel pump

asked by on

My truck shut off with no warning. Looked over a few things. I noticed the fuel pump was not coming on. I checked fuses and relays, all seemed to check out. Also the day before my truck shut off the fuel gauge got stuck in the full position. With everything seeming to be good I replaced the fuel pump. Still the fuel pump seems to be not getting any power. What would be the next thing for me to check?

My car has 118000 miles.
My car has an automatic transmission.

Hi there. Circuit test(s) need to be preformed to confirm the diagnosis. This can be done using a test light. With the key on engine off, power should be supplied to the fuel pump for two seconds, this is initialization. During cranking constant power is supplied.

The ignition switch supplies power to the power distribution center fuses. The fuse(s) supply power to the fuel pump relay control and load circuits. The fuel pump relay may appear to be working but it may not be. Next in the circuit is the fuel pump inertia switch, designed to stop power to the fuel pump in an accident or heavy impact. The other side of the fuel pump is the ground circuit. There may be a poor ground.

For more help, I recommend having your vehicle’s loss of power at the fuel pump inspected and repaired by a certified technician, such as one from YourMechanic.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car lost power while driving on highway and wont start now

There are several possible reasons for a vehicle to crank and not start. A bad fuel pump, clogged fuel filter, faulty injectors, bad ecu, failed ignition coil, or a malfunctioning sensor. It will first be necessary to figure out if...

Q: Why is my car acting like this?

Hi There, Shaking or vibration may be caused by many different things such as faulty spark plugs, poor fuel pressure or misfires. Other things such as a faulty idle air control valve may cause the engine idle to drop below...

Q: I own a 2000 f150 lariat 4 x4. 5.4 l. Started getting a loud grinding noise front passager brakes. Replaced brakes and wheel

Hi there. While using junkyard or used parts (especially brake or suspension parts) is highly discouraged and can cause major damage, it is unlikely that they caused the aluminum wheel to split in half. In most cases, this is caused...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.