Fuel pressure
Thread Starter
Advanced
Joined: Jul 2021
Posts: 98
Likes: 4
From: Florence, Al.
Fuel pressure
I need a little help taking the fuel pressure on my AC6 Z51.
I hooked up the tester to the end of the fuel rail, but not getting any readings. Is there something else I need to do to get a good number? I also tried to check the fuel line that goes into the rail but cant get the connector off. It looks like a push/pull connection but no luck (Yes I did take the connector lock off first).
I had a new fuel pump on it a few months ago so that shouldnt be the problem.
Thanks
Jim
I hooked up the tester to the end of the fuel rail, but not getting any readings. Is there something else I need to do to get a good number? I also tried to check the fuel line that goes into the rail but cant get the connector off. It looks like a push/pull connection but no luck (Yes I did take the connector lock off first).
I had a new fuel pump on it a few months ago so that shouldnt be the problem.
Thanks
Jim
Melting Slicks
Joined: Apr 2019
Posts: 2,504
Likes: 1,166
From: Northern Wisconsin
To disconnect the fuel line, you need a special, but inexpensive tool. Search on Youtube for videos that show how to disconnect the fuel line. Forgive me if this sounds dumb, but you didn't say that the engine was running when you tried to measure the pressure with your gauge on the fuel rail. The engine must be running, or in "on" mode so the fuel pump is running in order to measure fuel pressure.
Thread Starter
Advanced
Joined: Jul 2021
Posts: 98
Likes: 4
From: Florence, Al.
Fuel pressure
To disconnect the fuel line, you need a special, but inexpensive tool. Search on Youtube for videos that show how to disconnect the fuel line. Forgive me if this sounds dumb, but you didn't say that the engine was running when you tried to measure the pressure with your gauge on the fuel rail. The engine must be running, or in "on" mode so the fuel pump is running in order to measure fuel pressure.
I would hate it the fuel pump was bad. I just had a new one installed not long ago. I have no idea how long
GM warranties the Pump.
Thanks for your input.
Le Mans Master
Joined: Dec 2004
Posts: 5,492
Likes: 808
From: West coast CA
Check the fuel pump relay, and the fuel pump relay terminals in the connector under the fuse box.
Instructor
Joined: Feb 2020
Posts: 206
Likes: 14
From: Summerville, South Carolina
Did you ever get this fixed? I am having no fuel pressure at cranking either.
Thread Starter
Advanced
Joined: Jul 2021
Posts: 98
Likes: 4
From: Florence, Al.
FYI: Dont make the same mistake I made by taking the car to a dealer. I went through three chevy dealers who couldnt help me. I found a small shop that specializes in foreign cars and they had the thing fixed within three days.
Jim
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,595
Likes: 4,055
From: Cape Coral, Florida
Yes the car is fixed. After spending over $6000 on pumps and other parts it turned out to be an electrical issue. I would check that first.
FYI: Dont make the same mistake I made by taking the car to a dealer. I went through three chevy dealers who couldnt help me. I found a small shop that specializes in foreign cars and they had the thing fixed within three days.
Jim
FYI: Dont make the same mistake I made by taking the car to a dealer. I went through three chevy dealers who couldnt help me. I found a small shop that specializes in foreign cars and they had the thing fixed within three days.
Jim
Last edited by C5 Diag; May 27, 2023 at 04:31 PM.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,595
Likes: 4,055
From: Cape Coral, Florida
Do you own a 12 volt incandescent test light ??…that is all you need to diagnose this !!…does your fuel pressure gauge have a pin in the end of the hose that will push open the Schrader valve ??…do you hear the pump turn on for 2 seconds with ignition on ??
Last edited by C5 Diag; May 27, 2023 at 04:30 PM.
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