Removing the PPRV

[jivepepper]

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. I'm glad I only need one 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.

 

[Kilgore Trout]

I would delete it but no way am I dropping the tank unless I have to. Good luck, be careful.

 

[showstopper2]

Im taking that one step further with my car and deleting all of the feed tube in favor of 2 individual outlets in the hat... one to feed from each pump. want to make sure I can support 6-700hp with my fuel system.

 

[jivepepper]

I would delete it but no way am I dropping the tank unless I have to. Good luck, be careful.

I don't blame you I wouldn't either unless I a reason to.

Im taking that one step further with my car and deleting all of the feed tube in favor of 2 individual outlets in the hat... one to feed from each pump. want to make sure I can support 6-700hp with my fuel system.

Sounds like a good plan.

 

[hotmustang331]

Good luck with that...I deleted mine at first 2. BUT I could only get 3PSI at the rail before the pump cuts off....and when I turned the key back on, all that pressure had bled off LOL. I put mine back on and was able to get 10PSI and then I started it up...now it holds pressure. But thanks for the info...as it does apply to some, and you definatly will have to do what you did.

HOWEVER, mine didnt have that oulet valve to relieve excess presure....its simply a one way valve . So having it on has no side effects for me...and definatly no stumbling if I shift or let off the gas.

Only problme I have is that sometimes my fuel rail pressure just drops like a rock while cruising for no reason down to 10-15PSI (or so my gauge says) and then kicks back up...ZERO differece in the cars power or sound though. That same issue with it having a hard time controlling the GT pump, happens durring a shift or the such...presure spikes and it cuts the pump off. Well everyonce in a while it wont catch in time and drops to around 10PSI and sets off my FRPS sensor fault and bingo, engine light....but thats rare. With my new sensor, my pressure fall rarely goes below 20-25PSI....with the old one it was dropping to 10PSI.
My totally stock setup did the same weird thing with the pressure just doing random things for no reason, but but not nearly as bad and never set off a light.