C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

fuel pump??

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Old Mar 1, 2005 | 02:42 PM
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6spd
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Burning Brakes
 
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Default fuel pump??

question about my fuel pump. it's a 91 vette. i replaced the pump with one from napa. it seems the pump is not keeping up?? i have all bolt on's. encluding lt headers. it happens at 3900 rpms. i know tpi's run out around 4500 but it feels like it falls right on it's face. other than that no knock retard it runs perfect up to that point. plugs ,wires, coil everything new. i was told to buy a 255 pump a good name brand. what do you guys think?? fuel prssure is not dropping off i have a in the car gauge. pressure is at 40psi with line on.with line off it's 45psi. thanks
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Old Mar 1, 2005 | 02:44 PM
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I say test it.

RACE ON!!!
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Old Mar 1, 2005 | 02:49 PM
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how do i test it?? it works great till i get to that point of around 3900rpms
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Old Mar 1, 2005 | 02:55 PM
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Monitor your fuel pressure while you make a run. Put the greatest demand possible on the fuel system, high load, high rpms, and watch for a pressure drop.

RACE ON!!!
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Old Mar 1, 2005 | 02:59 PM
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6spd
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okay i will do that when the weather gets better. also i was told it could also be weak valve springs??
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