Boxer2rotary

iTrader: (8)

I thought at first it wasn't starting because of my weak compression in rear housing but after stalling and getting towed I realized I have zero fuel pressure. I am running supra fuel pump with a kenne bell bap, 550/1680 -8 lines and aeromotive fpr. I pulled the feed line off fuel tank and turned key and plenty of pressure, reconnected and removed line from secondary rail to fpr and I have fuel flow there. I removed fpr and installed new diaphragm even though old looked good but still no pressure. the injectors were cleaned and tested 600miles ago.

any advice or help.....

Busted7

Check for injector pulse it could be elect problem thus no fuel!
Fuse etc.

Boxer2rotary

iTrader: (8)

Okay, if it was a fuse wouldn't I still have fuel pressure at the fpr since I have fuel to the reg?

I will have to look on the wiring schematics to see where fuse is and I suppose I will check the fjo injector driver even though its brand new. I'm running a pfc I will reload my map as well.

Boxer2rotary

iTrader: (8)

I was thinking of bypassing the boost a pump but the pump is pumping fuel.

Sarusanj

iTrader: (9)

If you have flow/pressure all the way up to the fpr, then it must be the fpr? You have a gauge on the fpr I'm assuming?

Boxer2rotary

iTrader: (8)

Yes, I haven't spent hours digging into it but I do plan on verifying myself how much flow is actually at the fpr. I took the fpr apart and put a new diaphragm and the spring looked good. I will retest voltage at pump, can't hear it turn on but it is working so I will start there then check fuel filter but you would think I would get at least a few pounds is pressure.

RotaryEvolution

iTrader: (30)

check the pressure by teeing it off of the return line to the pressure regulator to see how much fuel pressure is really at the rails.

next, if you have an S5/6 remove the 4 pin connector at the top of the pump and i bet you will see the wires burned up from the BAP, even at stock voltage the upgraded fuel pumps burn up the craptastic S5/6 fuel pump connector on top of the pump. if you have an S4 and have the BAP wired in BEFORE the connector at the LR strut tower then move it to AFTER the connector. if you have an S5 pump housing use a bulkhead connector for the fuel pump at the top of the tank or get an S4 pump housing and swap your pump to it instead(S4 fuel pump recepticles already utilize bulkhead connectors and are superior to S5/6 ones, yay we do have something better than FDs!). if it is an FD i can't for 100% say that an S4 pump housing will fit the tank, you can modify it to use bulkhead connectors with isolators though and simply bypass the teeny tiny connector on top of the housing.

even if the connector isn't your issue you should still think about what i said before something bad does happen. i've dealt with it and seen it happen numerous times even on mildly modded 7's with those pump housings, the BAP just turns it into boost mode for the failure to occur.