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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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When car didn't start last time i didn't here fuel

Customer Question

when car didn't start last time i didn't here fuel pump running i suspect its the pcm i changed the fuel pump relay no luck there
Submitted: 1 year ago.
Category: Chevy
Expert:  Kavey replied 1 year ago.

Hello. My name is ***** ***** I will be helping you today.

What do you mean last time? Is the car starting now?

Why do you suspect the PCM?

Customer: replied 1 year ago.
i replaced fuel pump 6 months ago its been fine for 5 since then its shut down on express way and on short drive every tiome i go back out tou car to get it it will start and drive home only once was i there when it ditnt start right up and after looking at it for 10 min started ran fine its been up on jack stands ran it off and on for 2weeks ran fine today my daughter took it back out mile later she at work for 8 hrs no start
Customer: replied 1 year ago.
i dont here the fuel pump prime when no start has happened so its pcm or crazy loss of power
to pump or junk fuel pump works when it wants 2
Customer: replied 1 year ago.
are you there
Expert:  Kavey replied 1 year ago.

Did the system give you some indication I was not here?

Expert:  Kavey replied 1 year ago.

When it wont start do you have power to the fuel pump?

What brand pump did you put in?

Customer: replied 1 year ago.
no its tells me nothing
Customer: replied 1 year ago.
i have to have car towed home
Customer: replied 1 year ago.
lets assume no power for now
Customer: replied 1 year ago.
ill check tomorrow on power when i get it back
Expert:  Kavey replied 1 year ago.

Are you willing to pay for another question if your assumption is wrong and we have to start all over?

Customer: replied 1 year ago.
i guess my question is if no power and wires are good were 2 next
Expert:  Kavey replied 1 year ago.

Then you check for power to the relay on both the control side and the feed and you check to see if its getting a ground signal. If thats good you see if you can bypass it and get the fuel pump to run.

If that works you check the control circuit at the pcm. If its coming out of the PCM and not making it to the relay you find and fix the wire.

If its not coming out of the PCM you replace the PCM.