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Old 11-04-2003, 07:09 AM
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Holley Carb Problem

Hi all. I am new to this forum.

I have a problem that is bugging me. I have a 454 with a 750 Holley Square Bore Double Pumper on a performer intake and headers.

The carb can not control the fuel flow into the float bowls. The fuel pump is a standard mechanical pump (Replaced yesterday) and the re-circulating line from the pump to the tank is good. I have rebuilt the carb with the Holley kit. I can not get the floats to shut down the fuel flow.

Any Ideas before I put the Quadra Junk back on the motor?


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Old 11-04-2003, 07:28 AM
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The Smell of Nitro in the morn
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What pressure is the fuel pump rated at?
On the Primary Fuel Inlet & Valve Seat Assembly, remove it and check for crud under the seat. When installing it, with the washer under the nut put in the Valve Seat Assembly (needle jet) and screw it down until its half way into the nut and lock it down with the screw. This should get you close, You should be able to feel some resistance when getting close. Carefully with the site plug out use a scribe or something small and see if you can lift the float a little before a full stop, it may move about 1/4".
This is a starting point I always use, and works most of the time.
Clockwise is less gas in the float.
When adjusting, give the motor time to burn some gas from the carb to level out the float area before making any other adjustment.
Luv the smell of NITRO in the morning.
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Old 11-04-2003, 07:56 AM
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Thanks for the ideas. I'll check this out this weekend.

The fuel pump is the standard pump for a 78 454. I believe the presser is 5 to 7 LBS. Holley suggested putting a new pump on the motor because the line back to the tank could be clogged causing to much presser on the carb.

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