i am always looking for the simple thing... could be algae in the tank. you said you cleaned it but did you buy fuel again from the same place? perhaps too obvious a question but such a simple problem is easily overlooked.

good luck.

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.