I tried searching and couldn't find anything and no one else knows. I think have a problem w/ my Aeromotive FPR, but I'll let you guys make the call.

Everytime I start the car the FPR starts off at 40psi because of the cold idle and then drops down to 37psi (that's where I have it set for idle). Now when I start driving in both conditions (didn't let the engine warm up/ or warmed up) the fuel pressure gauge jumps like crazy and it fluctuates. It goes from like 40-100, 40-70,40-60, etc. but never goes down the other way. Then when I come to a stop it'll keep doing that for 3 seconds or so and then come back to 37psi. I think it's the way I mounted the FPR. Its really loose and wiggles at every small bump. Also the Gauge is electrical. My other fuel setup is nothing much besides at 255 Walbro Pump, AEM fuel rail, and stainless lines.

Please help me out. I don't want this thing messing up my tune. Any input about the problem would help. Thanks

Here is a pic of the mounted FPR...

 

Could it be the gauge?

If the FPR is moving around and the source line is getting compressed due to vibration, it'll impact fuel pressure for sure. I've seen the smallest movement impact fuel pressure.

 

could be your gauge, it could be broke. my fpr gauge broke and gave me crazy as hell readings.

 

sounds like bad gauge

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Synapse &raquo;</TD></TR><TR><TD CLASS="quote">Could it be the gauge?

If the FPR is moving around and the source line is getting compressed due to vibration, it'll impact fuel pressure for sure. I've seen the smallest movement impact fuel pressure.</TD></TR></TABLE>

True, I've seen a car do it after being shut off. There is still pressure in the lines and you move the line and the guage on the regulator shoots right up. So there might be alot of movement.

 

make sure the sending unit is grounded good. most of them ground threw the mounting point (the pipe threads). If the regulator isnt mounted good it could not be grounded there fore your sending unit will not be grounded. tighten it all up and see what happens. if still a problem take a piece of wire and clamp it to the sending unit with a hose clamp and ground the other end.