400 fuel pump

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Jul 22, 2012 | 05:25 PM

Schickel

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400 fuel pump

I recently put a new intake and a 650cfm holly carb on my truck and now my engine is starving for feul. Is there a manufacturer that makes larger capacity pumps or can i turn up an origonal one to compensate for the larger carb?

Jul 22, 2012 | 05:36 PM

J ballan

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From: Saskatchewan

I would put a gauge in before the carb and just verify what the fuel pressure is. From what I've heard a good stock pump should put out more than enough pressure.

Jul 22, 2012 | 05:49 PM

Schickel

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What should i have for pressure?

Jul 22, 2012 | 08:05 PM

J ballan

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From: Saskatchewan

I believe it should be around 6.5 to 8 psi.

Jul 22, 2012 | 08:26 PM

704 dentside man

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An intake and carb wouldn't relegate a, what was good fuel pump, now useless. My guess would be an improperly tuned new carb.

Jul 22, 2012 | 08:33 PM

devino246

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From: Lynchburg, VA

Are you positive it's starving for fuel and not flooding? The stock mechanical fuel pumps often output too much pressure for aftermarket carbs.

Jul 22, 2012 | 08:44 PM

Schickel

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Well it happens after ive been goin down the road for a while if i pump the gas or pull the choke it tries to keep running and i have a clear filter right before the carb that is almost empty when i get out and look at it