Computer replaced a little less then a year ago, the car wouldn't start?

JAMIENDAVE2006

MEMBER
1998 CHEVROLET TRUCK

I have had this car for about 4 years with a miriad of minor problems, but this one is a biggie. I had the computer replaced a little less then a year ago. In june, the car wouldn't start. I took it to a mechanic who got it started. Part of the time. He stated that there must be a problem in the theft system. The car sounds like it wants to start, but when you turn the key, the fuel pump won't start, which is preventing the engine from turning over. It started occasionally, but now won't start at all. The only theft system in the car is the one they put in, but there is no chip in the key. Help!

Wednesday, December 20th, 2006 AT 1:08 PM

1 Reply

SQM

MECHANIC
6,383 POSTS

Hello,

A fuel pump can be inoperative due to a bad relay, wiring harness or the pump itself.
First check the relay.
The fuel pump relay is located in the fuse block under the hood (see diagram).
Check the relay for any corrosion or burnt pins.
You can also test the relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

If the relay is good. Then check to see if you are getting power to the fuel pump connector. If there is no power with the key on then you have a faulty wiring. Possibly a short in the harness.

https://www.2carpros.com/articles/how-to-check-wiring

If there is power to that connector, then it is likely a bad fuel pump. In order to replace the pump you will have to drop the fuel tank.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

I have attached the diagrams for your reference.

Please let me know of any questions.
Thank you.

Images (Click to make bigger)