Thanks Tiny! Now that you say it.... the whole system was REALLY rusty when I first got her. I pressure washed what I could reach as much as possible on the rebuild, but a chemical flush might be a great idea.
The fuel pump is brand new, but it did sit for 4 years before it was ever really ran. Might start there.
Tim - I have an insulator and gasket underneath, although I have been checking the carb to see if it was bubbling in the bowl. I've read you can sometimes even hear it.
The bubbling is definitely coming down the line from the fuel pump and into the filter. The hotter then engine gets, the worse the problem gets. What made me lean towards vapor lock was that pouring cold water on the fuel pump made it immediately stop bubbling until it heats up again. I've tried it with a cold wet rag too, same result. Although maybe the heat is making something expand and then it's sucking air?
