Percolation? Heat soak? Don't drive during summer??

DentalDart said

You think I need a heat shield for the carb, when the carb isnt getting hot? Before I added the spacer it was hot to the touch, now when it dies its cool as can be.

My heat cross over is blocked off as well.

I had this carb on the past year, and never had a problem until I redid the engine and engine bay.

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That’s an issue with that type of carb (just like a TQ or a Q-jet) because the fuel bowls sit right over the hot intake manifold.

It’s great that you blocked off the crossover. An electric pump is a bandaid.

When the engine is turned off, the temp climbs even higher and the carb gets hotter and the fuel boils off. An electric pump doesn’t fix that.

Ive had them do the same thing sitting at a long stop light. The engine quits and then acts like it’s flooded (because it IS flooded from the fuel percolating out of the float bowls), but because there is no fuel in the carb, you have to crank the hell out of it to get the bowls filled AND get rid of all the excess fuel.

I have a 73 Duster sitting in my driveway right now that had the exact same issue. I live in a hot climate, so it was a PITA. The Cool Carb heat shield fix 98% of it. You can’t fix all of it because of the design of the carb.

The alcohol in the fuel doesn’t help, but that’s not all the problem. The number one issue is the design of the carb.