[Mister]

Tom,
I solved my percolation problems by replacing my large dropped base air filter with a small diameter air filter.
My theory, right or wrong, was that the big air filter was trapping heat. Whatever the actual cause was, the small air filter eliminated my fuel delivery problems.
By the way, my problems were much worse when "winter gas" was sold. I think it is more gaseous than "summer gas".
Good luck.
Mike