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Old 12-06-2011, 09:11 PM
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carbourators

what could cause a quadra jet 4 barrel to leak gas out over night

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Old 12-07-2011, 01:33 AM
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Quote:
Originally Posted by 4speeed
what could cause a quadra jet 4 barrel to leak gas out over night
Is fuel puddling in the intake? If so, most likely the main well plugs are leaking. Fixes for this is to either peen the metal back over the plugs better, use an epoxy like Marine Tex to cover the plugs, or remove the original plugs and thread the holes for short screws.

Otherwise it could be heat soak- the hot engine temp could be percolating/evaporating the fuel out of the float bowl.
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Old 12-07-2011, 04:09 AM
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Also, if there is no filter in the inlet, it can siphon back out.....
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Old 12-07-2011, 07:32 AM
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More than likely it is your well plugs leaking. Very common with Q-Jets. Rather than epoxying them, obtain replacement plugs from NAPA and install them. The replacement plug has a sealing o-ring that the factory plug didn't have. I never had any luck with epoxy. Remove the original plug and measure the diameter. The plugs come in two sizes.
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Old 12-07-2011, 08:11 AM
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Quote:
Originally Posted by boothboy
More than likely it is your well plugs leaking. Very common with Q-Jets. Rather than epoxying them, obtain replacement plugs from NAPA and install them. The replacement plug has a sealing o-ring that the factory plug didn't have. I never had any luck with epoxy. Remove the original plug and measure the diameter. The plugs come in two sizes.
I hadn't heard of the NAPA plugs before. Do you have a p/n?
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Old 12-07-2011, 08:25 AM
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NAPA is a nation wide auto parts store. remove and measure the diameter of your plugs and tell them you need well plugs for a Q-Jet carb with this dimension. If they don't have them a good carb shop will. The easiest way to tell if you have leaking well plugs is to get your engine hot. Shut it off, wait 20 mins, remove your carb lifting it straight up and look at the bottom of it. If you see gas dripping from the throttle plate you got bad well plugs.
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Old 12-07-2011, 08:30 AM
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Quote:
Originally Posted by boothboy
NAPA is a nation wide auto parts store. remove and measure the diameter of your plugs and tell them you need well plugs for a Q-Jet carb with this dimension. If they don't have them a good carb shop will.
I'm familiar w/NAPA. My question was more about a specific part number because I have never heard of anything like this being sold by anyone- including Ruggles or Gessler. If the plugs have a rubber O-ring, I don't know how they would last, but I'm always up for a new fix to an old problem. So thanks anyway.

Last edited by cobalt327; 12-07-2011 at 08:41 AM.
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Old 12-07-2011, 09:41 AM
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Well my NAPA guy couldn't find them either. But he's only twelve. A quick google and here is the results.

http://quadrajetparts.com/advanced_s...ef74c0&x=0&y=0

As I said before, there is more than one size hence more than one part #

I never said the o-ring was made of rubber. They have been using o-rings in carburators for years. Ever re-build a Holley?
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Old 12-07-2011, 10:38 AM
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Nah, never. Appreciate the link.
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