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Old 07-31-2006, 11:57 PM
willys36@aol.com's Avatar
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Holley carb fuel evaporation - shrunk gaskets

I am having trouble with my Holley carb in my Willys. Have moved into a new house so the car has been sitting idle for extended periods. After a month or two, I get in to drive it and find the fuel has evaporated out of the bowls, the gaskets have shrunk and the car of course barely runs. New set of gaskets and I am off and running again. I will try the 'no shrink' blue gaskets this time but the bigger question is why is my fuel evaporating so quickly? Modern Oldsmobuicks don't seem to have that problem. Any ideas, short of giving the car a spin every week?

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Old 08-01-2006, 12:25 AM
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I had the same problem once. I figure maybe it evaporates through the cork. Makes you wonder what they were thinking. Oldsmobuicks in my past have always used paper gaskets and they don't seem to be a problem. Or maybe it just leaks out the well plugs so fast it doesn't have a chance to evaporate.
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Old 08-01-2006, 01:02 AM
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This new formulated gasoline evaporates much more quickly as it is blended for fuel injection and evaporation is not a consideration in a closed EVAP system.

It will also vaporize more quickly than the older style fuel leading to quicker vapor lock on a carbureted car. They don't have to worry about it with 42 psi EFI electric fuel pumps.
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Old 08-01-2006, 11:55 AM
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Typically Holley carbs had the fuel bowls vented to the atmosphere.

Put some fuel into a cup. Then cover the cup with come plastic wrap. Stick a pencil thru the plastic wrap to simulate the vent hole. Set this in the garage or patio where you can simulate the sitting vehicle. Observe the gas to see how fast it evaporates. This will give you some visual evidence of what happens inside the carb normally.

These days some of the gaskets available should eliminate the dreaded "dried out gasket syndrome".

Part of the problem with the evaporating gas is it leaves behind particles that crystalize and form debris that can clog the metering block ports. If you are going to store you might be wise to drain the bowls first that way you eliminate the gas residue. Or, if you have an electric pump, you can "prime" the carb routinely to keep the bowls full.
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Old 08-01-2006, 06:42 PM
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Quote:
Originally Posted by larryblack

Part of the problem with the evaporating gas is it leaves behind particles that crystalize and form debris that can clog the metering block ports. If you are going to store you might be wise to drain the bowls first that way you eliminate the gas residue. Or, if you have an electric pump, you can "prime" the carb routinely to keep the bowls full.
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Old 08-02-2006, 07:13 PM
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Thanx guys. Guess I will install blue gaskets and turn on the key once a week to prime the bowls.
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