I think my fuel pressure regulator is stuck as it sits on damn near 50#s at idle until I get on it or run it for a long time on the highway, then it relaxes to approx. 40-42#. The regulator is part of the rail on my 01 f 150 and I'd like to at least have the option of changing regulators or even having the ability to go with an adjustable regulator. I know people are using 97-98 f 150 rails as they have a removable regulator, my question is where to get these rails. Also makes no difference on fuel pressure with or without vaccuum line attatched while running and it has plenty of vaccuum at the line. Throwing rich code and I think the regulator is the problem.

 

i'd just go to the junkyard and get one from there. just flush it out before you install it.

 

Sounds like the Regulator to me .. These guys are pretty Damn quick - Two days on average getting the stuff to your front door

https://www.rockauto.com/catalog/rac...&parttype=1792

WHOOPS! When you hit the link above you get my old parts list. Just X that list out then the 98 regulator can be found scrolling down a bit.

 

every high performance truck needs the '97-'98 fuel rails, a lot of lightning guys switch over too

 

Anybody know if there's a difference between the 4.6/5.4 rails, as I have a guy who has 97 4.6 rails for sale???