fuel pressure help
Thread Starter
|
New User
Joined: Mar 2003
Posts: 5
Likes: 0
From: woodbine u.s
fuel pressure help
hey guys. my friend has a 1991 f-150 with a 5.8 in it. he has been complaining of poor fuel mileage lately. he brought it over and we ran some checks on it and found that his fuel pressure is running about 100 psi. could he have a bad regulator or is something else causing this problem. any help would be appreciated.
Posting Guru
Joined: Jul 2003
Posts: 2,232
Likes: 1
From: Colville, Washington
EGADS!!! Is that with the truck running? Normal fuel pressure shoud not be more than 40-45 psi tops. At idle it should be around 30 psi. Check the pressure regulator and the vacuum line to it. I didn't know the pump was capable of 100 psi!!Putt
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
Sounds like there is some sort of blockage in the return lines to the fuel tank(s). I'm not sure how you would find the blockage - it may be just as easy to run new lines, depending on where the blockage may be. I'd disconnect the return line at the tank to verify that there is no flow through the line, as opposed to there being a blockage in the sending unit in the tank. Also check for kinks in the line.
