FPR Vacuum Configuration
Thread Starter
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
FPR Vacuum Configuration
I'm in the C5 forum because I have a LS1 question.
Working on a friend's C4 with a LS1 engine. It was installed by an engine shop with lots of changes to the car and frame. My question is in regard to the fuel pressure regular (FPR).
The FPR is installed on the right side rear and top of engine with a fuel pressure gauge along side of it. Starts fine and runs with a pressure of 60 psi. But the pressure never changes when throttle is opened. I noticed the vacuum port is capped off with no input vacuum to it.
I did put vacuum to the FPR and it did vary the fuel pressure so it does work. It's just not hooked up so the fuel pressure remains at 60 psi.
Is this a normal set up for a LS1 where there's no vacuum line to the manifold?
Thanks for the input.
Working on a friend's C4 with a LS1 engine. It was installed by an engine shop with lots of changes to the car and frame. My question is in regard to the fuel pressure regular (FPR).
The FPR is installed on the right side rear and top of engine with a fuel pressure gauge along side of it. Starts fine and runs with a pressure of 60 psi. But the pressure never changes when throttle is opened. I noticed the vacuum port is capped off with no input vacuum to it.
I did put vacuum to the FPR and it did vary the fuel pressure so it does work. It's just not hooked up so the fuel pressure remains at 60 psi.
Is this a normal set up for a LS1 where there's no vacuum line to the manifold?
Thanks for the input.
Thread Starter
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
Race Director
Joined: Apr 2007
Posts: 11,150
Likes: 890
From: South Western Ontario
Well, my car has a little hose in it but it goes to the air breather where there is no vacuum. Plugging it may not be the best idea since that side needs to have an atmospheric reference.
Thread Starter
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
Point taken. Florida pretty flat not much change on atmospheric pressure here. Also I don’t think that little plastic cap seals that well.
