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Old 05-24-2013, 06:39 PM
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Holley flooding after warm up

I have a Holley 4150 750 cfm on top of my 454 c.i. After I take the car for a ride and it warms up the carb will flood. I can shut the car off and I can hear gas steaming into the front 2 chambers. The car starts fine and runs fine until I get it nice and warm then it will just start flooding. Would any one know what would cause this? Why wouldnt it start flooding during the time its coming up to temp?
Thanks in advance for any input you may have.

Thanks
Brian

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Old 05-24-2013, 06:48 PM
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start with checking fuel pressure
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Old 05-24-2013, 09:12 PM
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can you see fuel free flowing out of the boosters, or is it primarily on the idle circuit, I agree to check fuel pressure, second check you needle and seat
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Old 05-24-2013, 11:50 PM
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Flooding Holley - try this

I agree with all the advise given. I am running several Holley carbs, and every now and then a flooding issue will come up. In every case with me it has always been trash in the needle and seat, and in most cases you can not see it. I run a filter before the fuel pump and carb and it still happens. 99% of the time I can remove the needle and seat assembly, blow it out with compressed air, re- install and no more problems. You can do this without dismantling the carb. The only things that can cause this as far as I know are, excessive fuel pressure, bad needle and seat, bad float, float not adjusted properly, and trash in the needle and seat. Trash removal is the cheapest to repair, so I would start with that. If the car was running well and it just started doing this out of the blue, I would suspect a bad needle and seat or trash.
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Old 05-27-2013, 09:36 AM
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Both sides of the carb were flooded. I took the carb off and blew out the needle seats and metering blocks. Both floats were sound and in good shape. I reinstalled the carb. I also replaced replaced the plugs as they were carboned over. Restarted the car and its idleing fine. Now if the temperature ever warms up and it stops raining, I'll be able to take it for a test ride.
Thank you all for the advise and input. Its much appreciated.
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Old 05-27-2013, 09:44 AM
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Are you running a carb spacer or heat shield?

You may be boiling the fuel in the carb.
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Old 05-27-2013, 07:57 PM
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I have a 1" spacer under the carb.
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Old 05-27-2013, 10:26 PM
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Quote:
Originally Posted by Hawkfan View Post
I have a 1" spacer under the carb.
Is the spacer aluminum? You need a composite type spacer that does not transfer heat.
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Old 05-28-2013, 03:11 PM
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The spacer is phonolic
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Old 05-28-2013, 03:19 PM
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Well, you probably already know what I'm going to suggest. Install a 0-15 psi mechanical fuel pressure gauge temporarily on the cowl of the vehicle so that you can monitor fuel pressure as you drive. 6 psi max for a Holley. 5 psi max for Carter, Edelbrock and Rochester.
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Old 05-28-2013, 07:19 PM
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ok, I see this kind of problem from time to time and is why I asked if it is flowing fuel out of boosters and this is that the carb is a tad to small for the engine, primarily on big blocks, and what happens is that the idle gets turned up so high to get it to feed the motor that it changes from idles circuit to the throttle circuit, and when this happens the carb will continuously dump in fuel but the problem is that you don't have enough air, go to the holley web site at trouble shooting where it explains how to make the idle holes in the butterflies bigger so that you can then bring the carb back into the idle circuit and out of the throttle circuit. and always check your fuel pressure, if you believe your getting forms of trash in your carb after two filters, your fuel may have high quantities of ethanol which can cause corrosion. good luck
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Old 06-02-2013, 09:39 AM
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This is some great information and exceptional assistance! Knowing just enough to get by on carburetors, I need all the help I can get. I'm running a mechanical fuel pump. My pressure runs 7 to 8 psi. I havent made any adjustments to the carb out side of setting the idle to achieve 850 rpms. If 7 to 8 psi for this Holley, how would I control it with using a mechanical fuel pump? I'm running a modified cam & I had the block bored .060 over.
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Old 06-02-2013, 09:53 AM
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put a fuel regulator before the carb,set around 5-6 pounds max
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Old 06-14-2013, 05:56 PM
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Gentlemen,
Thanks for the advise. I put a regulator in, set it at 5 psi and everything seems to be fine.
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Old 06-14-2013, 09:49 PM
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post a video so we can see and hear it,,,
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