If you are running a return fuel setup you may want to consider this modification to you fuel system. After a lot of trial and error I found that the factory fuel system regulates the fuel pressure to approx. 50psi by venting off the excess pressure before it even leaves tank. The advantage to modifying your factory FPR is to allow your 1 to 1 FPR to continue climbing with your higher boost levels. A few added benefits are that fuel atomizes awesome around 60psi and you can flow more fuel out of your smaller injectors.

Note: If you don’t have a return fuel setup or upgraded fuel pump this isn’t going to help you much.

Below is a simple straight to the point DIY assuming you know how to get to your fuel pump assembly.


The FPR is located just right of the bottom of the pump. The picture show the top of the top of pump assembly removed; this is not required.


The FPR is very snug in the assembly but will come off easily if pulled straight out.


At this point mix up your epoxy (JB Weld). Get a small sandwich bag and fill the epoxy into a corner and cut a VERY small tip off of the corner.

Carefully squirt the epoxy into the o-ring side of the FPR, it will settle down into the FPR within moments so top it back off.

Once you're done let it sit over night before putting it back in the pump assembly.

 

Good write up!

 

Nice writeup RSRacer. I'm glad to see that we're not the only one that's realized the limitation of the factory fuel system with forced induction.

We didn't want to let the cat out of the bag yet, but here's the billet FPR bypass pill/plug that will be included with our upgraded competition return-style fuel system. The factory intank FPR is set to bleed off at 47psi, a little over 3 Bar (43.5 psi), the standard static pressure for a forced induction fuel system. Without eliminating the stock in-tank regulator, you will not be able to increase the FPR at the rail when using the in-tank pump as the main pump.



MrC

 

MrC, you guys are Always ahead of the game. Nice work, and Nice work RSRacer.

 

Funny, thing you show that plug. The first thing I did after filling mine in was to take a pair of calipers to it and model it in solid works. Your's looks identical to mine right down to the red anodizing.