5bar FPR fuel line pressure?

[wross996TT]

So I have blown three hoses internal to the fuel pump. I have a 5bar FPR installed. Does anyone know (or have thoughts) how much pressure a 5 bar FPR should allow? Is the 5 bar maximum/average or what?

TIA!

[Loren]

Sounds right...

Target test values when engine not running: 3.8 ± 0.2 bar.

Target test values when engine is idling: 3.3 ± 0.2 bar.

You can check the volume too..

Target value for supplied fuel quantity: − in 30 seconds, at least 1.25 liters.

[wross996TT]

Loren, those pressures are for the stock FPR (3.8). Since my system is modified, I am running the 5 bar FPR...don't know the spec or expected actual peak pressure (other than 5 bar = ~73.5 psi), but the tech did some runs and saw pressures to 85psi...I am wondering if the FPR is faulty or if this is normal.

Edited September 26, 2012 by wross996TT

[JFP in PA]

Why are you trying to run such a high fuel pressure? Everything in the fuel system is rated for the factory 3.3-3.8 bar pressures, so I am not surprised things are not holding up when the pressures are nearly 46% higher.........

[wross996TT]

JFP...can you say ~650HP... The only part of the fuel system to fail is the rubber U-shaped hose...it has been designed out by Porsche, so I'm guessing I'm not the only one with issues. In any case we have modified the hose length and installed a high pressure fuel submersible hose....should do the trick.

[JFP in PA]

JFP...can you say ~650HP... The only part of the fuel system to fail is the rubber U-shaped hose...it has been designed out by Porsche, so I'm guessing I'm not the only one with issues. In any case we have modified the hose length and installed a high pressure fuel submersible hose....should do the trick.

Pardon my repeated questions, but why do you need so much pressure? I've seen these non-DFI engines go big HP the dyno with lots of fuel volume (larger lines, bigger injectors, etc.), but without increasing the pressure. If you can find DFI lines that are the correct size and shape, they would work as the DFI operate north of 1,000 PSIG........

[wross996TT]

No worries. You are correct, I am at the limit of the stock fuel delivery system. Bumping up the pressure is as far as I could go without doing rails, injectors etc. Quite honestly the limits of my current configuration are fuel delivery...but I am quite happy here...any more and I would have to consider multiple internal mods.