Searched for about 15 minutes, but couldn't exactly come up with a definitive answer.

Short mods list:
Rebuilt s5 jspec(not running yet)
Intake/exhaust ports about as big as they can get
RA classic seals, solid corners etc.
RTEK 1.7
750cc Seccondaries
Stock prims
Walbro 255

I have an aftermarket FPR that I'm wanting to run, but am sorta skeptical about running it along with the stock FPR.

1: Is it possible, or even worth it to run an aftermarket FPR with the stock rails+FPR?

2: Can/should I just cut the stock FPR off, and weld a barb onto it?

 

use the s4 TII rails and heighten it with 4mm spacers to the secondary rail
(check out Rising RPM - Home They will mention this on their aftermarket rail setup)

 

So just banjo the primary, and barb the secondary?

M14x1.5 is the size I need for the secondary correct?

 

RETED has all the info on the other forum where he converted it all to A/N Fittings.

It may even be in the Archives,but hey..your dilemma.my suggestion.
I got a gallon of oil to clean up after a blown sender...Yay..

 

There is no point in running 2 fpr.
Use the s4 t2 fuel rail and do a pulsation dampener delete.
I did not want to redo all of my fuel line from the pump to the rail, so I kept everything 5/16", but with AEM fpr. I am only expecting 300whp range

 

Okay, now I'm getting pissed off.

I can not, for the life of me, find an m12x1.25 to 5/16 barb fitting for the secondary rail.

I may run a m12x1.25 to AN-6, then an AN-6 to 3/8 barb fitting. But then I'd have to shove the 5/16 fuel line onto the bigger 3/8, and I'm not real comfortable with that.


What the hell is everybody doing to run FPR's on S4 rails?? This is turning out to be pretty annoying.

 

They remove fpr and pulsation damp along with the secondary banjo bolts and such...then it's a matter of using AN fittings right on the rail. Unlike the s5...everything is removable on s4 rails...they are also aluminum so they get pretty when you polish them.

 

maybe this will help, this is what i did

FC3S Pro v2.0: Mods - Fuel System

i bought all fittings from summit, good luck

 

THAT is what I was talking about,.all parts listed to do it right there

 

by the way,.,an engine will lose 4 litres in 10 seconds through a 1/8th sender hole!..