Holley Carb Flooding on Shutdown - Team Camaro Tech
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post #1 of 3 (permalink) Old Apr 16th, 09, 04:22 PM Thread Starter
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Holley Carb Flooding on Shutdown

I have a Holley Red pump (internally regulated at ~6psi) and Holley 4150 that is flooding on engine shutdown. While running, the fuel level in both bowls are correctly set to the bottom of the site plugs.

After driving and shuting it down, it is hard to restart and I've noticed it leaking on the manifold and the butterflies are wet. Thinking that it was a stuck float, I noticed that the sight plugs showed that both fuel bowls are overfilled. I now suspect the fuel pressure is getting too high at some point or at shutdown.

Any ideas what could be causing this?


'68 Camaro RS - 502ci, Viper T56, Ford 9", Z06 brakes<br />'67 Camaro - 327ci, TH350, Ford 9", Baer<br />'97 Viper GTS - 488ci, Borla, K&N, shifter, Hoosier slicks
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post #2 of 3 (permalink) Old Apr 17th, 09, 07:52 AM
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Lightbulb Re: Holley Carb Flooding on Shutdown

I'd try a regulator set at 5 psi.

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post #3 of 3 (permalink) Old Apr 18th, 09, 07:06 AM
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Re: Holley Carb Flooding on Shutdown

Check the fuel line routing. If it runs ok but floods when turned off the fuel is likely boiling in the line and pushing past the floats.

Last edited by markw; Apr 18th, 09 at 07:07 AM. Reason: spellcheck
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