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fuel psi falling off at high rpms

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Old Oct 29, 2004 | 01:14 PM
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From: east coast performance and tuning, jacksonville, nc
Default fuel psi falling off at high rpms

on the dyno ive noticed my fuel starts to fall off at 6200rpm. it falls about 15psi and the car starts to go lean. my set up is 255 walbro, aem fuel rail and 550 rc injectors. my question is, is the fuel pump lossing voltage or is the oem fuel line to small for 275hp to 300hp.
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Old Oct 29, 2004 | 01:57 PM
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Default Re: fuel psi falling off at high rpms (UJLSMoFo)

bump
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Old Oct 29, 2004 | 02:41 PM
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Default Re: fuel psi falling off at high rpms (UJLSMoFo)

Same thing happened to me and it turned out to be my fuel pump taking a crap...My guess is thats your problem.The fuel pump is going south.
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Old Oct 29, 2004 | 03:14 PM
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From: Bethel, Ct., USA
Default Re: fuel psi falling off at high rpms (UJLSMoFo)

Wow, this is pretty funny. I had a Walbro quit on me. I substituted it with the Czech Motec recommended Bosch 0 580 254 044. This is largest single that Bosch makes, it is motorsport pump for Porsche. Motec approves it for 700 hp. It weighs about 4 pounds and is loud as hell, but it works.

Mine has never had a hiccup with 72 pound Siemens at 460 RWHP and 3.3 bar.
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Old Oct 30, 2004 | 08:37 AM
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From: east coast performance and tuning, jacksonville, nc
Default Re: fuel psi falling off at high rpms (UJLSMoFo)

caued voltage be a problem?
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