Just out of curiosity, if your running an aftermarket fuel pressure regulator, what size vac hose are you using for your boost reference port? I think I might have too small of a line (3/16 vac line) causing fuel delivery issues over 25psi. Let me know if you guys are using 1/4 or bigger, thanks.

What's your fuel pressure under boost? Does your fuel pressure drop when you get over 25psi??
I don't think a single Bosch 044 And 1450s with enough especially with e85.

I ran a tiny -3AN line to mine and had no issues. The I.D. is .14", which is smaller yet than your 3/16" hose.

SlowSpyder said:

What's your fuel pressure under boost? Does your fuel pressure drop when you get over 25psi??
I don't think a single Bosch 044 And 1450s with enough especially with e85.

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How do you know that isn't enough fuel, he didn't even say what his setup is. He could be on a 16g for all we know.

I have -4 from a vacuum manifold run to my regulator.

My fuel system is
Twin intank walbros 255s
Kenne bell boost a pump running at 18v
Fic2150s
-8 feed/stock return
Russell fuel filter
Oem rail with -8 adapters
Weldon fpr

Car runs e85 only boost is 40psi...base fuel pressure is 43.

99gst_racer said:

I ran a tiny -3AN line to mine and had no issues. The I.D. is .14", which is smaller yet than your 3/16" hose.

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My pressure starts to drop off erraticly around 25psi. Im wondering if the 3/16 hose is holding me back.

goodhart said:

How do you know that isn't enough fuel, he didn't even say what his setup is. He could be on a 16g for all we know.

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Read his profile, definitely not updated.

It was all bolt on once i got the fitting for the fuel rail.With a -6an fuel line.Stock vaccume line.
I hope that helps.

firebirdvert305 said:

My pressure starts to drop off erraticly around 25psi. Im wondering if the 3/16 hose is holding me back.

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Which regulator are you running?

Weldon -10