Yes I do know the problem. The fuel pump was heating the fuel to over it's boiling point. No "hot lines" boiling it. I don't know what you mean about changing too many things at once. I changed the fuel pump to an electric one mounted in a cooler area and the problem went away. Bad gas? Bad gas for years and years from 20 or more different gas stations? All the info is in the thread, but it was quite a long thread and I don't expect anyone to re-read it all.