Ok, this has been driving my nuts. My fuel pressure only rises about 3 or 4 psi wot. I have a Cartech FMU from hahn (I know I know) The Vac source I have going to the 3rd nipple on the back of the intake mani, there is also a universal check valve in line to the fmu. It's set at 55 psi @ idle and I'm running 5psi of boost stock injectors. I just changed my fuel filter too. Also, I have a really crappy idle if I DONT have any fuel system cleaner in my tank. Anyone have any clues as to what this may be?
97 RS-T HRC Stage 1, SFMU, TurboXS RFL, Stage 2 with FMIC soon to be installed...
#94261, "RE: Craptech FMU or something else?" In response to Reply # 0
doesnt the check valve go after the fmu i know when i had th cartech the vacuum line went straight from the sourse to the nipple on the cartech and then a bleed line had the check valve i never had a problem with mine
#94265, "RE: Craptech FMU or something else?" In response to Reply # 1
Originally posted by baxsom doesnt the check valve go after the fmu i know when i had th cartech the vacuum line went straight from the sourse to the nipple on the cartech and then a bleed line had the check valve i never had a problem with mine
Yea x2. With a check valve, wont it not see positive pressure, therefor not raising your fuel pressure?
#94276, "RE: Craptech FMU or something else?" In response to Reply # 3 Mar-30-06 12:39 AM by baxsom
Originally posted by kasper6188 The hahn manual shows the check valve going between the manifold and the fmu so it can only see boost and not see a vaccum.
you got a manual??
by the time my manual was delivered the kit was almost on
check out this thread it has a pic of my old cartech you can see the check valve after the cartech and the car ran perfect
the only reason i got rid of it was i put in a portfueler with the aeromotive 1:1 idled at 45psi raised the pressure to more than double that at high boost
#94277, "RE: Craptech FMU or something else?" In response to Reply # 5
Yeah, I have it installed so the boost can go through it to the fmu. I got my manual with my kit, got lucky. I'm going to try to do it like everyone else is doing it today though, just put it after the fmu. I hope this helps out because it's been doing this for a while now. I hope it's not my fuel pump. I have the 255lph that hahn supplies.
97 RS-T HRC Stage 1, SFMU, TurboXS RFL, Stage 2 with FMIC soon to be installed...
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