Skip the auto shop - Our mechanics make house calls

Q: I replaced the fuel pump and now my truck won't start

asked by on

I recently replaced the fuel pump and now my truck won't start. When the fuel pump is hooked up on the tank, no fuel is pushed through, but I can hear the pump running. However, when I disconnect the fuel pump and hook it straight to the battery, the fuel pump sprays fuel out. I've checked and both the relay and the fuse are good. What else could be the problem?

My car has 200000 miles.
My car has an automatic transmission.

A: Hi there: In some cases, when the fuel pum...

Hi there:

In some cases, when the fuel pump is not supplying fuel from the tank to the fuel injectors it's due to one of three different issues. First, it's possible that the pump or some of the hose attachments are installed backwards or that there is a blockage somewhere in the fuel lines; typically at the first fuel filter. Finally, it's possible that you have a ground issue somewhere near the fuel pump that's causing a reduction in power. The best way to trace this issue is to contact a mobile mechanic and have them help you diagnose this issue; as the process for tracing a fuel pump delivery issue can be complex and very time consuming.

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・Save up to 30%

Get a quote

What others are asking

Q: Noises coming from the undercarriage.

I suspect you have a driveshaft issue, probably one of the U-joints (the front is a double U-joint, or Cardan joint). This driveshaft also has a sliding spline section, which, if it gets grit in it or is not lubricated,...

Q: How do I pair a phone with the Bluetooth system?

Before using your phone with the Bluetooth system, you’ll need to pair the phone. Here’s how: 1. Press the Phone Send button. 2. Following the prompt, say “Connect Phone”. 3. Following the prompt, say “Add Phone”. 4. Follow the instruction...

Q: Pickup is running rough, jerking, stalling, and not idling over 3000 rpms

Hey there. This sounds like an air/fuel delivery problem which may be a result of a dirty or failing mass air flow sensor. This may also be a result of a failing O2 sensor which may also cause an incorrect...

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 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...