sometimes the vac lines to the electrical check valve BOV are not correct installed....

 

So I thought I found the issue...found two pieces of old FPR crammed way into where the FPR goes. I thought for sure that was my problem. Unfortunately, it made absolutely no difference...car still runs like crap and I am still getting 55 psi at idle and +/- 70psi under acceleration on a 3.8 bar FPR.

Would a clogged return fuel line cause higher fuel pressure? I'm thinking some of the smaller pieces from the old FPRs made into the fuel rail and maybe they are obstructing the return line?

How do I measure the return fuel pressure? And which fuel line is the return? The Green appears to be the out line. There is a line at the top of the sender and there is one (grey) next to the green line.

 

Yes, a clogged return line will cause elevated pressure. 3.8bar is pretty close to 55psi, add 1bar of boost and you have 70psi. 1bar is 14.5psi. Your tune appears to be the problem IMO.

 

So it is normal for a 3.8 bar to go to 70psi? Some are saying a 3.8 FPR should peak at 55 not above?

 

weres the rest of the pieces? they had to have gone somewere and into the fuel system would be my guess. possibly remove some fuel ines and try to blow them out with compressed air?

 

I'd say 90% came out with the pieces I got out...the balance must have gone into the fuel system...I'm not convinced that is my problem.

It would be nice to know if there is a method to measure the return fuel pressure to see if there is a problem.

No one has been able to tell me if I have "normal" fuel pressure as it is. I'm getting 55psi(3.8bar) at idle and 72psi(5bar) when accelerating with a stock 3.8bar FPR

 

you could remove the return line from the rail and add a line with a t fitting in connected to a gauge. readings from there. or at the fuel tank were it returns to the tank. that would likely be the easiest place to work from

 

If it's a 1:1 ratio FPR and pressure is applied YES pressure will rise with boost That vac hose attached to it is raising pressure under boost to compensate for that pressure in your intake attempting to blow the fuel back up the pipe. Likewise at idle it should lower pressure. When you remove the vac hose it settles at base pressure, vac and boost pressure modify it. I've said this a few times now, perhaps a 3rd party source will be trusted?

http://www.turbosmartusa.com/technic...s-an-fpr-work/

To be clear 1bar is 14.5psi. 3.8x14.5=55psi 1bar of boost added to that is 70psi. If anything your pressure should be lower at idle, is there a check valve on that line? Does the pressure RISE at idle when the vac hose is removed? It should....

 

Thanks, MY fuel pressure never goes below 55psi. I'll try removing the vac line and see what it reads.

 

any solution on this issue?