Skip the auto shop - Our mechanics make house calls

Q: Fuel pump won't energize

asked by on

'98 S10 fuel pump won't energize. New fuel pump, new relay, new oil pressure switch. If I reverse the two black wires on the pump it runs but the fuel gauge shows full with only 2 gallons of gas in the tank. If I wire it back according to the instructions the pump won't energize but the gauge reads correctly. If I bypass the codes and it doesn't help and I put the wires back to their original position will the computer reset itself. Please explain. Thank You.

My car has 200000 miles.
My car has a manual transmission.

Hi and thanks for contacting YourMechanic. Either you have the wrong fuel pump for the vehicle or the circuits to the fuel pump are shorted together and causing an issue with the fuel indicator an pump. The pump should have 3 wires, hot wire, ground wire, and gauge wire. If you are able to get the pump to work with the wires backwards and then when putting the wires on correctly the pump stops working, then you probably have the wrong year of pump. If you need further assistance troubleshooting your fuel pump, then seek out a technician, such as one from YourMechanic, that can assist you with your vehicle.

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!
  1. Home
  2. Questions
  3. Fuel pump won't energize

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 Sitting waiting for repair. Sat 9 Months Now repair finished but will not start.

Hi...gasoline has a limited shelf life. After four months or so, but sometimes even earlier, gum and varnish develop. Gasoline that is nine months old will typically not have enough of the volatile fractions (from the refinery process) to start...

Q: Where are the pump relay and fuses located?

Hi there - the fuel pump relay is under the hood, at the rear of the engine compartment, fairly high up on the firewall. There are a row of 3 relays, just behind and slightly to the right of the...

Q: No power to any components after doing my clutch

For your 2001 Volkswagen Jetta, you'll need to make sure all the large main fuses are not blown. You may not have identified the number 176 position. The fuse is a 110amp. It powers the inside main fuses. Check the...

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...
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.