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Old 02-15-2012, 12:45 PM
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been thinking of your problem, did you know that q-jets have this infamous welch plugs under the fuel bowl that always leak? they are under the main circuit fuel wells, two adjacent plugs that are some sort of pinned/riveted/hammered down or someting, they need to be seal covered with epoxy, when they leak your mixture becomes very rich, and is likely that when the carb gets hot the gaps grow bigger and the leak increases upsetting your mixture, they'll dump lots of fuel directly above the throttle plates.

one sure way to know you have this problem is when you let the car sit for two or three days, it takes long to start because the fuel bowl has drained empty.

some carb rebuild kits have this piece of dense foam that is inserted between the main body and the throttle plates body gasket, where the big hole in the center is, to help sealing this leaks but I have found it does nothing, only epoxy cures this problem.
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