How to intall fuel pressure regulator ?

[yoga-serega]

Hey evey one! I'm new to the community so don't be to hard on me ) I've tried to search for this kind of thread but could not find anything cirtain.

So I have got a few questions about instalation. Do I hooked it up to the return line? what do I do with the stock fuel pressure regulator ? And what would be stock pressure for rb20det on r32 ?

Thank you...

[maximumrpm]

yes hook it up to the stock fuel line then the other end to your fuel rail...u have to remove the fpr...and the other line is a vacuum line to your plenum

[yoga-serega]

Which line? feed fuel line or return line? so the stock one just sit on top of fuel rail or it is actully conected with it? Can I just take the vacum line off the stock one and put it on new one ?

Thax

[yoga-serega]

bump

[Sydneykid]

What sort of aftermarket fuel pressure regulator (FPR) do you have?

We use Nismo FPR's ($180 from Nengun), they replace the standard FPR.

1. So we just unbolt the standard FPR from the fuel rail, replace it with the Nismo FPR and swap over the vacuum hose (from the standard FPR to the Nismo FPR)

2. Then we set up the fuel pressure, to standard (36-38 psi) using a fuel pressure gauge

3. If we need more (or less ) fuel flow we adjust the FPR on the dyno to achieve the AF ratios we want.

Note that #2 requires a fule pressure gauge and #3 requires a dyno, do you have either of those? If not I would not suggest fitting it yourself as it is very easy to run too low fuel pressure and detonate (via lean running) your engine.

If you have bought a stand alone FPR (does not replace the standard FPR) then you simply mount it somewhere close by the standard FPR. Run the fuel return so it goes;

fuel rail--->std FPR--->aftermarket FPR---> std return to the tank

You will need to T into the vacuum supply (from the plenum to the std FPR) to supply vacuum to the aftermarket FPR.

Hope that was of some hlep:cheers:

[Boosting]

so if you get after marker fuel pressure reg u still need the factory one to.

if so why would that be

[Sydneykid]

so if you get after marker fuel pressure reg u still need the factory one to.

if so why would that be

You don't NEED the standard FPR, but if you remove it, what are you going to replace it with? It has to be a fitting that bolts to the end of the standard fuel rail and has plumbing to supply the excess fuel to the aftermarket FPR.

So it is easier/cheaper to simply leave the standard FPR there.

[Waldo]

buy a sard adapter for $35 from horsepower in a box...it bolts right onto the standard RB fuel rail

[Bobjones]

So SK your saying that at idle the standard FPR is running 36-38psi....

EDIT: on a RB25det????