Your Walbro doesn't push pressure, it flows. If the FPR can't flow enough to bypass what a healthy FP displaces then you build up pressure over target pressure. Typically this only happens if you have a Walbro 255HP (as opposed to normal 255) and are running a small exit FPR. The non-automatic B-series have "large exit" FPRs that can handle 700, or more. I'll know how much when Goforth's new car goes together.

There are interesting ways around this, just look at what Toyota did with their factory fuel pumps.

 

ok that makes sense. i was also getting a #1 cel code and i thought it was because it was loading up my o2 sensor. it only comes on about 10 miles of steady throttle. thats the only reason i was thinking about getting an adjustable fpr. maybe i'm wrong about whats causing it?

 

FPR?

First Person Shooter?


Halo 3?

 

For your application the original should be fine

 

I have a B&M and no problems. Works fine for me.

 

I also have on from DH Racing. Same as the B&M but billet. It uses the stock regulator with some modifications.