Skip the auto shop - Our mechanics make house calls

Q: Is my fuel pump bad?

asked by on

I tested my fuel pressure in my truck with the key on engine off and the psi went up to 60 then almost immediately dropped... does this mean my fuel pump is bad?

This means your fuel pump is coming on like it should. The pump will cycle on for a few seconds and then turn off if you just turn the key to on. This should happen each time you cycle the key.

60 psi is normal also. The pressure should stay close to 60 psi after the key is off for a long time to keep pressure at the injection system.

If the pressure drops to 0 psi real quick then you have a leak down problem and the fuel system would need to be checked to see if it is the fuel pump, pressure regulator or injection system not holding pressure. The pressure regulator and fuel pump are the most common failures of not holding the pressure.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Possible fuel pump problems?

Assuming you have the stock equipment still in your truck, it should have come with throttle body fuel injection and not a carburetor. If this is the case, you likely have a low fuel pressure issue that is preventing the...

Q: My Check Engine Light came on and the code read intake valve is stuck open

Hi there: Anytime you have an error code created, it is stored inside the ECU and triggers the check engine light. The only way to solve the issue is to have a professional mechanic to complete a check engine light...

Q: I'm only getting 5.5v to the fuel pump

Hi there. If you are only getting 5.5 volts at the red wire with the black stripe and battery voltage at the relay, then you have a bad connection in the circuit. You should also have battery voltage at fuse...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.