Fuel pump troubleshooting
Fuel pump troubleshooting My fuel pump sounds like its barely priming now. I want to replace the relay and fuse to see if that will help, so does anyone have a part number for the relay? And what fuse is it? Its a 96 LT1 btw. Also how do you check the prime connector?
TECH Veteran
Joined: Dec 2008
Posts: 4,145
Likes: 61
From: Little Rock, AR
Save yourself all the trouble and attach a test gauge to check the pressure. The relay uses the PCM BAT fuse, so if the car is running, it's not that. The prime connector is there to manually run the pump when 12v is jumped to it.
Sh, I looked at your diagrams and see the priming connector. With a fuel pressure gauge connected, turning the key ON shows no pressure. I'm guessing this is where I try to manually jump the fuel pump? And, I do that by just running a wire to it from the battery or other 12v source?
This is for my '97Z by the way...
This is for my '97Z by the way...
Alright, I ran a fused wire from the + to the prime connector and nothing happened. Does the ignition have to be on when I do this? I think you said that the prime connector bypasses the relay, so it can't be the relay, right? By the way thanks for your site, it really is helpful...
TECH Veteran
Joined: Dec 2008
Posts: 4,145
Likes: 61
From: Little Rock, AR
Alright, I ran a fused wire from the + to the prime connector and nothing happened. Does the ignition have to be on when I do this? I think you said that the prime connector bypasses the relay, so it can't be the relay, right? By the way thanks for your site, it really is helpful...
Do some continuity testing to see if your circuitry is ok.
Please forgive my ignorance, but how do I that, and to what circuits am I doing that to? I have a voltmeter and a non-powered testlight if that helps, which reminds me, I tested the orange wire at the relay harness and there's power...
