I'm removing my PPRV (parallel pressure relief valve).
Basically it's a one way check valve in the fuel tank that keeps pressure in the line to make it easier to start when the car has sat for a while. But it also incorporates a pressure relief valve that dumps excessive pump pressure back in into the tank. This is necessary since a returnless fuel system with the PPRV won't allow the pressure back through the pump.
Since I'm running the pumps at a higher than normal fuel pressure when I shift at high rpms the fuel pressure spikes for a mili second and causes the relief valve to open spilling gas back into the tank. This in return causes a drop of pressure across the fuel injectors. My car stumbles for a second then comes back on in between shifts. Especially between 3rd and fourth at wide open throttle and shifting fast. The last few times at the track this has been happening hurting my et and mph. Alot of 03-04 Cobra guys have this problem and I have the same fuel pump set so I hope this helps.
Took me forever to find sae 30r10 submersible fuel line at $21 a foot.
Now for the fun part of taking the tank down and Fuel pump assembly out. I hate working around gas.
If any you Cobra guys are having this problem I would suggest going to www.modularfords.com and searching for PPRV.
Basically it's a one way check valve in the fuel tank that keeps pressure in the line to make it easier to start when the car has sat for a while. But it also incorporates a pressure relief valve that dumps excessive pump pressure back in into the tank. This is necessary since a returnless fuel system with the PPRV won't allow the pressure back through the pump.
Since I'm running the pumps at a higher than normal fuel pressure when I shift at high rpms the fuel pressure spikes for a mili second and causes the relief valve to open spilling gas back into the tank. This in return causes a drop of pressure across the fuel injectors. My car stumbles for a second then comes back on in between shifts. Especially between 3rd and fourth at wide open throttle and shifting fast. The last few times at the track this has been happening hurting my et and mph. Alot of 03-04 Cobra guys have this problem and I have the same fuel pump set so I hope this helps.
Took me forever to find sae 30r10 submersible fuel line at $21 a foot.
Now for the fun part of taking the tank down and Fuel pump assembly out. I hate working around gas.
If any you Cobra guys are having this problem I would suggest going to www.modularfords.com and searching for PPRV.