96 LT-1 fuel pressure
03-20-2017, 12:32 PM
#1
Melting Slicks
Thread Starter
97 LT-1 fuel pressure
Hey guys, hoping somebody can help me out. 96 LT1..fuel pressure at idle is 20 psi. When I disconnect the vacuum to the fuel pressure regulator the gauge only moves to 21psi. Gauge does not change when revving...if I stab the throttle it will stumble, sometimes stall. If I roll on it breaks up around 3500-4000 rpm. I've replaced the opti 6months ago. I'm thinking fuel pump. I hate to just throw parts at it. Thanks, Bill
Last edited by HT1663WB; 03-20-2017 at 12:52 PM.
03-20-2017, 12:52 PM
#2
Race Director
Hey guys, hoping somebody can help me out. 96 LT1..fuel pressure at idle is 20 psi. When I disconnect the vacuum to the fuel pressure regulator the gauge only moves to 21psi. Gauge does not change when revving...if I stab the throttle it will stumble, sometimes stall. If I roll on it breaks up around 3500-4000 rpm. I've replaced the opti 6months ago. I'm thinking fuel pump. I hate to just throw parts at it. Thanks, Bill
IMO
one of three things
1. Clogged filter
2. Old fuel pump
3. Bad regulator
If the fuel pressure regulator is good, I'd move on to fuel filter if its original, since its a maintenance item
Good news is pulling the pump is really easy on a C4.....
Last edited by aboatguy; 03-20-2017 at 12:55 PM.
The following users liked this post:
HT1663WB (03-21-2017)
03-20-2017, 12:59 PM
#4
Race Director
Did you pinch off the fuel return line IOT check fuel pressure regulator?
If you did that and line pressure didn't jump up its time to look at the pump.
Good news is you can remove the pump easily and it may be a dirty sock or leaking pulsator etc... but all accessible from the top without dropping the tank.
<Mike
If you did that and line pressure didn't jump up its time to look at the pump.
Good news is you can remove the pump easily and it may be a dirty sock or leaking pulsator etc... but all accessible from the top without dropping the tank.
<Mike
Last edited by aboatguy; 03-20-2017 at 01:03 PM.
The following users liked this post:
HT1663WB (03-21-2017)
The following users liked this post:
HT1663WB (03-21-2017)