Ok so i installed the port fueler and all, got it running, under vac the car runs great, and has a steady fuel pressure at around 35. As the car builds boost the fuel pressure drops and the car sputters down like its out of gas. Any suggestions?

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97 RS-T, STAR Stage 2, HAHN FMIC, Decah Lambo Doors, 19" Axis Hiros, Built 420a - SOLD
2004 - G35 6MT 20" HREs & Tein Flex
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I just went through the same problem and it turned my fuel filter was really dirty and clogged. Id try that first.

I'll give it a try, but it must be VERY clogged the fuel pres drops to the point the car wants to die, closer to 10-15 psi

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97 RS-T, STAR Stage 2, HAHN FMIC, Decah Lambo Doors, 19" Axis Hiros, Built 420a - SOLD
2004 - G35 6MT 20" HREs & Tein Flex
-----------------------------------

Thats where mine was dropping too.

are you running a port fueler as well. Also would the car just build boost, and go nowhere with it? I'm gonna go ahead and change it out, but it just sounds too easy to be the problem lol, i have HORRIBLE luck so thats why i ask.

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97 RS-T, STAR Stage 2, HAHN FMIC, Decah Lambo Doors, 19" Axis Hiros, Built 420a - SOLD
2004 - G35 6MT 20" HREs & Tein Flex
-----------------------------------

Im Ms'd, but all in all same symptoms.

What would happen is I would build up to around 8psi then my fuel pressure would fall on its face, around 15-20psi.

I thought the same as you when you said "this is too easy of a fix", lol.

Give it a try, you never know.

Good luck, hope it works or you figure it out.
DJ

ok so new fuel filter solved nothing, same as before, pressure appears to be dropping at the same rate boost is building? Help!! Haha im so damn close to getting this thing back on the road what is going on???!??!

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97 RS-T, STAR Stage 2, HAHN FMIC, Decah Lambo Doors, 19" Axis Hiros, Built 420a - SOLD
2004 - G35 6MT 20" HREs & Tein Flex
-----------------------------------

The only other thing I can think of, is you have a vac leak some were thats small enough under vac to not really notice, but under boost it pushes open the whole instead of collapsing it, like vacuum does.

Do you have a boost leak detector?

Reversed the lines on the 1:1?? feed side, return bottom...

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Dying fuel pump, or a dead inline...

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new pump, and the 1:1 is correct. Only thing im wondering is if the port fueler isn't coming on would it loose fuel pressure going into boost?

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97 RS-T, STAR Stage 2, HAHN FMIC, Decah Lambo Doors, 19" Axis Hiros, Built 420a - SOLD
2004 - G35 6MT 20" HREs & Tein Flex
-----------------------------------