Hi All,

I've been trying to figure this one out for a while now with no luck. Perhaps someone here can point me in the right direction.

I've set my static FP at 32psi and even after i turn on the engine it stays at 32 psi. When i WOT fuel pressure never exceeds 40psi. DOes this sound right?
I've wired the fuel pump to the battery via a relay. Any insight or ideas are most welcomed.TIA.

Regards,

Dave

 

Tried to delete... no "Delete" feature!!!! Sorry.

 

Here is a paragraph by me from an earlier thread:
The 1994 factory manual states on page TD-4 that the FPR specs are 35.6 - 37.0 psi output pressure. (The fuel pump itself should provide 71.1 - 106.7 psi.)

 

what does it mean if your fuel pressure doesnt hold well after you turn off the car?

 

Are you testing the fuel pressure with the car running?

There are 2 relays for the fuel pump, the standard fuel pump relay and then fuel pump relay (speed) which bypasses the resistor and increases the voltage to the pump. Make sure you didn't take this out of the loop when you wired it up.

edit : I see that you did your own wiring and took the resistor out of the equation. Have you tested the voltage at the pump? It sounds like either you're not getting enough voltage (bad relay or wires), pump on its way out, or maybe you have a clog somewhere in the line prior to where you're checking the pressure.

charlie

 

Thanks for the feedback guys. I pretty much worked on the back of the car. Splicing 12V power supply wire to pump and running it directly to battery via relay.

What sort of fuel pressure are you guys seeing in the following rpms:

Idle -
0psi-
Boost-

 

Just to quickly clarify my fuel system:

Stock 550 Inj.
1600 Secondary
Walbro 255fuel pump
Sard FPR