Fuel pressure issue
Thread Starter
Advanced
Joined: Aug 2014
Posts: 50
Likes: 2
From: Wilmington North Carolina
Fuel pressure issue
hi guys, I have an '84 with cross fire injection. 120k on odometer but rebuilt enfine and tranny with no history of time done. However, lately with trying to fix my idling and having long cranks when starting, I've come to the conclusion i have bad fuel pressure. How can I test my fuel pressure? And if it's low, which im sure it is. What can I do to fix it? What areas need to be replaced or checked? And how can I build in a fuel pressure sensor gauge so as to keep an eye on the pressure?
Drifting
Joined: Mar 2006
Posts: 1,263
Likes: 188
From: Wabasha Mn
The factory fuel filter is down on the front pass side frame rail. It has short rubber connector hoses with clamps so is easy to plug in a test pressure gauge. Good time to change out the filter anyway, they are inexpensive too. On my 84 with 70k on it I got a reading of 15 psi. If it reads low then it would be time to install a new pump and fuel sock.
Thread Starter
Advanced
Joined: Aug 2014
Posts: 50
Likes: 2
From: Wilmington North Carolina
The factory fuel filter is down on the front pass side frame rail. It has short rubber connector hoses with clamps so is easy to plug in a test pressure gauge. Good time to change out the filter anyway, they are inexpensive too. On my 84 with 70k on it I got a reading of 15 psi. If it reads low then it would be time to install a new pump and fuel sock.
Team Owner
Joined: Feb 2006
Posts: 23,156
Likes: 117
From: San Antonio Texas
Getting to the fuel pump on a C4 is one of the few projects that isn't a huge hassle. The whole thing comes out of the filler neck. The pump itself might be old and weak. A friend had a pressure problem and it was the rubber hose from the fuel pump to the output steel line. It had developed a leak, from old hard rubber, and was just bleeding off fuel back into the tank. It made just enough pressure that the engine barely ran but it wouldn't pull the car.
Thread Starter
Advanced
Joined: Aug 2014
Posts: 50
Likes: 2
From: Wilmington North Carolina
The factory fuel filter is down on the front pass side frame rail. It has short rubber connector hoses with clamps so is easy to plug in a test pressure gauge. Good time to change out the filter anyway, they are inexpensive too. On my 84 with 70k on it I got a reading of 15 psi. If it reads low then it would be time to install a new pump and fuel sock.
