So I was adjusting the fuel pressure last night and I set it to 42psi with the vacuum line disconnected for the AFPR and I had that line plugged with a screw. I then turned the ty off, took the screw out, and plugged the vacuum line back in. I started the ty and my fuel pressure guage still said 42psi. WTF. From what I remember, shouldn't it jump up like 10psi once the vacuum line is plugged back in. I know I know, something is clogging the vacuum lines and I need to redo them all... again, and the check valves. Anything else I should look for?
Vacuum problem... I think
- Thread starter AZTY
- Start date
turbodog
Donating Member
Actually it should jump DOWN ~ 7 psi at idle, because it follows manifold vacuum/pressure, and the manifold is in vacuum at idle. Might be a check valve installed incorrectly. There should be no check valves in the path between the FPR and the intake. If you have a mityVac, you can manually pull a vacuum on the FPR and see if fuel pressure responds. could be the AFPR has failed. Definitely stay out of boost until you're sure the fuel pressure is tracking boost level correctly. HTH.
BigBadSmoosh
Picking fights on I-65 since 2013
vac lines, aren't that prone to go bad..
I mean, hell since I replaced mine with the silicon ones, I haven't had a single problem..
I mean, hell since I replaced mine with the silicon ones, I haven't had a single problem..