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Old 11-15-2011, 07:19 PM
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why holley carb leaking gas onto manifold

I have holley dp carb thats leaks around the screws and around the base and the back of the carb what cause this problem........thanks the car dont misfire runs great

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Old 11-16-2011, 06:06 AM
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Leaky washers around the bolts, floats too high, too much fuel pressure.
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Old 11-16-2011, 07:20 AM
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Sounds like it needs a rebuild kit..

It could be high fuel pressure as well but it would also be leaking into the intake if that was the case.. Stuck floats as stated already..

What fuel pump you running? Whats fuel PSI?
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Old 11-16-2011, 09:27 AM
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Has the carb sat dry for a while? Gaskets might be dry?

In any case, it sounds like an overhaul, or at least re-gasket and float adjustment might be in order.
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Old 12-02-2011, 03:58 PM
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it only leaks when engine off after a drive
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Old 12-02-2011, 04:05 PM
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my Holley 3310

always leaked when i let it set for a month or so in my 390 ford 1948 Coupe. but it swelled the gaskets after an hour and always stopped leaking until i let them dry out again by not running the engine. I never had to re do the carb

Last edited by rsfyj; 12-02-2011 at 04:06 PM. Reason: spelling
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Old 12-04-2011, 09:13 AM
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Could have bad gaskets or a blown powervalve, or inproper float level
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Old 12-04-2011, 12:30 PM
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You have too high rear float or leaky fuel valve.
Fuel pressure, etc. would effect both bowls.
Check the float level when idling and adjust as needed.
Stop the engine and see if the fuel level rises after shutoff. If it does, you have valve problems. Could be the small "O" rings on the valve or a problem I see often is some Teflon tape in the valve seat.
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Old 12-04-2011, 02:00 PM
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If it was the float adjustment, the engine wouldn't run well. Your indicating the engine runs fine. If the floats were adjusted too high, the engine itself would be flooded and most likely spuddering or blowing some black smoke out the exhaust. It does sound like the floats, but not the adjustment. I'm curious if you have trouble initially starting the car, like the car is flooded and you have to put the pedal down to the floor to start it? I would check or replace the needle and seat for the float. What it sounds like is while the engine is running, you should have 4-6 lbs of fuel pressure, which is enough to apply pressure to the float needle and seat causing it to stop fuel from flowing into the bowls. When the engine is stopped and sits, the pressure is released slightly allowing the fuel to fill because the needle and seat are no longer sealing properly, at least until the fuel pressure is gone. One way to check this is to drive the car, park it and after a few minutes remove the float inspection screw on the side of bowls and see if gas flow out. If it does, the needle and seat need to be replaced. Also try this while the engine is running and see if fuel still comes out. Otherwise, go around and retighten some of the screws and even check the base plate to manifold nuts for tightness. Check the fuel lines for leaks and may a loose clamp or fitting.

Last edited by kleen56; 12-04-2011 at 02:07 PM.
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