Q: Q: No power to the fuel pump

asked by on

I was driving home one friday, and stopped at a light. The light changed and I started to accelerate and bam my truck stopped accelerating and I pulled over to the shoulder. After getting towed home I looked for the problem. I discovered my fuel pump was not working. So I ordered a new fuel pump not testing the old one. I took off my bed, and replaced the pump. But to no avail, I wasn't getting power to my pump. So I decided to test the old pump using a power source and the damn thing ran... I don't know where to go from here, I tested my fuses and relays and they were all good. What's my next step?

My car has 220000 miles.
My car has an automatic transmission.

Hi. I would go back over a few things. Specifically, the fuel pump relay and fuses. Check the voltage drop across the fuel pump relay while trying to start it. An older relay will pass a resistance test (the contacts do indeed touch) but won’t pass enough current because the contacts are burned.

Also check the fuses for the ECM as well. Check the oil pump pressure switch - this is a low oil pressure fail-safe to protect the engine. Last but not least, make sure the ground for the fuel pump itself is good and clean. When you removed the bed, you removed several ground wires for taillights, and the fuel pump. Make sure it’s back on with a good clean ground. If these checks are not successful, I would recommend having an expert, like one from YourMechanic, inspect the loss of power and address this issue properly.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Q: No power to the fuel pump

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: Check engine light not working.

If the check engine light is not coming on, then that is a good sign. If your dashboard before displayed the check engine light before and now it is not coming on, then the dashboard warning light could have burned...

Q: What makes my trailblazer start and die repeatedly? I have changed fuel pump and steering column whats next?

Hello, thank you for writing in. When you address the steering column, I am assuming that you replaced the ignition switch. This is one component that may cause this issues, but you are most likely dealing with an air, fuel,...

Q: Fuel gauge still reading as full after driving

Hello. There are not many things which can cause an erratic fuel gauge reading. They're usually one of two things, the fuel gauge display itself as being faulty or a bad fuel gauge sending unit. I suggest that you drive...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.