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Old 06-08-2007, 05:26 PM
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holley float adjustment

First i set the idle mixture using a vaccuum guage to the highest vacuum at 850rpm. 12mm hg. My fuel pressure is set at 5.5psi.

I recently bought this 650 holley double pumper on ebay. I adjusted the floats with the electric fuel pump on and the engine off to where fuel came up to the bottom of the sight plug. I did this on the front and rear barrels.
It ran great for a few minute and then I took it for a spin and the first lauch was great and on the way home it started to run bad. I opened the air cleaner to find the rear barrels being bolused with large drops of fuel at idle. The front barrels were fine. I readjusted with the car off and fuel pump on. It started great and ran ok for about 5 min then the fuel started to seep out the jets again in the back.
Should I set with car running or does this sound like a leaky float? The floats are brass.
Thanks, joe

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Old 06-08-2007, 08:05 PM
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I agree with Mark, bad needle and seat, or if it has a brass float the float could have a leak. This would allow the float to get some gas in it and sink a little which will open the needle and seat.
Vince
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Old 06-09-2007, 09:06 AM
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Thanks, I'll give that a try.
joe
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Old 06-09-2007, 12:44 PM
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Changed it and car runs beautfully,
thanks
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