Q: No power to the fuel pumps

asked by on

There is no power going to the fuel pumps. We changed all the relays over and still nothing. If we ground the wire at the plug for the computer where you connect an obd reader to we get the pumps to turn on. What would cause this problem

My car has 101000 miles.
My car has an automatic transmission.

This is a tricky issue to diagnose without being there in person. It sounds like the pump may be getting a bad or weak ground. You will need a full wiring diagram and a knowledge of vehicle electronics and schematics to diagnose this. Start by checking power and ground for the pump at the relay terminals, and if you have power and ground, then jump the relay with a wire and see if the pump runs. If it doesn’t, then it may be getting a weak ground somewhere else. Also check all the ground connections for the vehicle, especially ones along the frame of the truck, as these are often subjected to weather elements and may corrode, causing a bad connection. If this yields no results, I would have a qualified professional diagnose the loss of power at fuel pumps and help you move forward with repairs.

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. No power to the fuel pumps

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: Hesitation when accelerating

Hi There, It sounds like you are describing the symptoms of a failing throttle position sensor. The throttle position sensor monitors the throttle position of the throttle plate inside the throttle body in relation to your foot position on the...

Q: Fuel shutoff switch

According to the owner's manual for your vehicle, your "vehicle has a feature that may automatically unlock the doors, turn on the interior lamps, turn on the hazard warning flashers, and shut off the fuel system after the airbags inflate."...

Q: intermittent no start

Follow the positive cable wires until you get to the connections between the fuse box's main power fuse to make sure you are getting good connections. Connect your volt meter between the battery center post and the outside of the...

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...
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...
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...