Hex7E

I have a greddy ajustable FPR and i was wondering what to set the fuel presure to. Also if anyone knows which of the 2 spouts is return and which is the input (the 2 spouts are down and right).

I got the part because i know i have a fuel problem, i have replaced the injectors and i can hear the fuel pump gooing. The fuel pump has alreaty been rewired. It could still be the fuel pump but i thaught i would try this first. I know it is a fuel issue because it runs on staring fluid only.

SonicRaT

iTrader: (6)

40psi base

NZConvertible

If you have no way to adjust fuelling (fuel controller, standalone) you should stick to the stock 36psi. If you set it higher your mixtures will all be correspondingly higher.

scathcart

Stock is 34-39 psi (FSM, 4B-71)
Every stock car that I have installed a FP gauge on has been 39-40 psi static pressure.

NZConvertible

Well the average of those two number is 36.5psi. I'm going off the specs on page 4A-9 and 4B-9 which says 35.6-37psi.

Hex7E, did you measure fuel pressure before you replaced the FPR? It's a very uncommon failure point.

Hex7E

i have no way to test it, but i did test the old fpr with compressed air after takeing the thing appart. It appears to be good, which would mean leads me to beleave that the fuel pump is the only thing left to try. unless there is something i missed.

If i started the car without the vaccume line on the fpr what would happen?

buttsjim

If i started the car without the vaccume line on the fpr what would happen?[/QUOTE]

Taking the vacuum line off the FPR should increase your fuel pressure about 10 psi, or so (in addition to creating a vacuum leak). According to the FSM, the specified pressure is about 28 psi with the vacuum line connected, and 34 - 39 psi without it.