RB26 going lean after fuel system upgrade

[fullthrottle]

Rb26 in s13
Replaced stock tank, lines, fuel rail, FPR and filter with the following
10 gallon Fuel cell
-6an lines for supply and return
1 255lph hi pressure walbro gsl392
trickflow fuel filter
godspeed fuel rail
Aeromotive FPR set at 40psi

This problem didnt exist before this fuel system was installed into the car. Before i was using one walbro 255 intank fuel pump with stock lines and nismo FPR.
The fuel pump is mounted even with the bottom of the tank. Gravity should feed the fuel to the pump so i believe this is correct. My problem is that at high rpms in boost im going lean 16-18 A/F ratio and it starts cutting out and breaking up and I let off the gas as soon as it happens. Ive tried raising the pressure and running direct battery power to the fuel pump for full voltage. Still no change. Bad brand new pump? Any suggestions would be greatly appreciated.

[Boosted_240sx]

u need to get a fuel pressure gauge inside this way u can see it sounds to me like gravity isnt feeding the pump fast enough to get the right pressure at higher rpms

or get a go pro and put infront of ur pressure gauge and do a pull with it recording

[fullthrottle]

u need to get a fuel pressure gauge inside this way u can see it sounds to me like gravity isnt feeding the pump fast enough to get the right pressure at higher rpms

or get a go pro and put infront of ur pressure gauge and do a pull with it recording


This is at the top of my list along with swapping the pump out with my other pump. I was planning to run two of these pumps inline but one is suppose to be plenty. And im not running a surge tank yet which could be why im having this problem.

[TurboStrong]

so what happened to your car? im interested!

[fullthrottle]

It was a clogged fuel filter


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[PureRush]

Why dont you remove the fpr and see if the issue still exists

[fullthrottle]

Because the only reason I bumped the thread was to explain what was wrong.... And you can't remove the fpr and have the car run.... There's no way to connect the fuel lines without it.

[TurboStrong]

okay quick question i too am replacing my hard fuel lines on my s13 for my 26 but ive heard so many review on using different size lines like -8 to return and -6 to feed or vise versa? your using -6 for return and feed? and did for the end tips are you using those like c clap tips that only need a screw driver to tighten or loosen, also are u still using your stock oem gas tank breather line?

i looked around too for cheap steal braided lines but thats def not the case where i live its 8$ a foot, where did u get your setup please and thank you!!<3333

[fullthrottle]

You can't clamp ss lines to anything and expect your car not to catch on fire. You need to use jic fittings or -an fittings on everything. I'm using a fuel cell so I'm not using the oem tank breather. I bought a Godspeed fuel rail with 6 an fittings and then all of my lines and fittings were bought from summit or jegs. I used an automotive fpr with all 6an fittings and lines. Make sure your return line goes back to the top of the tank. I burned up a pump by having it return to a fitting at the bottom.

[fullthrottle]

And I used a trick flow inline fuel filter with 40micron filter.