Quote:
Originally Posted by FrankieT/A
I have robbmc 1/2 INCH PICK UP, 550 PUMP AND 1/2 INCH LINE ALL THE WAY TO THE QUAD ALL STAINLESS EXCEPT PICK UP TO ROBBMC 100 MICRON FILTER, BODY CONNECTION AND FRAME TO PUMP. My car still goes to zero top of third (manual). My cap is vented, then drilled 1/8 inch hole through cap and then ultimately left cap just laying on. Nothing helps. Im going to a pusher. BTW all connections are tight and all parts are new. Please excuse caps im typing on phone
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It's not unusual for the pressure to drop 1, 2 or even 3 psi at full throttle with a 550HP pump because a regulator is not required. But if the pressure is dropping to ZERO, something is wrong. Since you seem to have checked everything else, ship the pump back to us and let us check it for you. Maybe a valve is being held open by a piece of debris. What is the fuel pressure at idle?