loss of fuel pressure

[delphinE30]

long story short....car ran normal, all of a sudden i have no power, smooth accel but just no power. next day i sart the car its normal. i replace the fuel filter. (very dirty) still lost pressure. replaced the FPR and checked fuel pumps and related fuel items. hooked up a FP gauge and it was good. good untill i rev it above 3,500 full throttle. it cuts....just no power no hesitation or anything just blah no power. sawpped ECUs and did the same thing. im completely lost now........

[05OCsrt-4]

sounds like possibly the filter in the fuel tank or the fuel pump is taking a crap

[delphinE30]

yea but only at higher R's and reset fuel pressure when the car is restarted?? o and i have 2 fuel pumps

[enigma]

Are the pumps inline, or parallel draw?
If one of the inline pumps takes a crap, or has stuff in it, it will create a parasitic load on the other pump.

[delphinE30]

yea we did think of that. we tested the main pump and it seemed to be alright. but ill probly just rip it out and see whats up with.