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Pontiac Forum: Carburetor Flooding When Hot
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  #1  
Old August 5th, 2018, 07:04 PM
Maxxthedog Maxxthedog is offline
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Carburetor Flooding When Hot

Hi Gang,
I have search this (and other) sites and seen similar issues to mine but not quite the same.
1972, 350 2bbl, 350 auto, all stock.
New, manual stock fuel pump.
Carb was rebuild.

After driving car and it is how (about 30 minutes or so), the engine will flood and die. I was finally able to get it to do this in the garage with the air cleaner off. I looked down the carb and gas as pouring into the carb. It only does this when hot.
I have seen this issue on a hot restart, but never while driving down the road.

I have seen a recommendation to check my fuel pressure. How do I do that? Just put a hose on the end of the fuel line that does to the carb and crank the engine?
For those of you that have a psi gauge in-line, how did you do it? I have one solid metal line that runs from the fuel pump to the carb.

Thanks
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Old August 6th, 2018, 10:49 AM
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melsg5 melsg5 is offline
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you probably will want to rent a tester and connect it to the end of the line.
You either have too much pressure or the float was not correctly adjusted or installed.
Do you know the published PSI of the pump that you installed?
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Old August 7th, 2018, 02:10 PM
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cammerjeff cammerjeff is offline
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My guess would be the float level set to high.
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Old August 12th, 2018, 02:54 AM
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Kraig1957 Kraig1957 is offline
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If the pressure is too high, you could get an adjustable in-line fuel pressure regulator. I have used a type similar to the Mr. Gasket 9710.

I set it at 3.5 psi with an electric fuel pump and that was enough for my 1972 Lemans with a 400 cubic inch V8 and an Edelbrock 625cfm carb. I have also used it with an Edelbrock Quadrajet Carb, back when I had to still get the car smog checked in California.
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Old September 17th, 2018, 08:50 PM
Maxxthedog Maxxthedog is offline
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UPDATE Finally

Thanks for all of the help.
Looks like the float was set wrong. I set it to the instructions and it still acted up. Lowered it a bit and was better. When it is real hot it will still act up so I might have to come down again.
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Old September 18th, 2018, 09:23 AM
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Not sure what kind of float you have, metal or a plastic but both types can have issues. The metal can develop leaks and the plastic can become porous. The metal one you submerge in some water and check for air bubbles.
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