Thanks fo ryour suggestion , bill.
However, I tried all that you suggested. I took the fuel tank out, pressure tested it and the lines. I also cleaned out the fuel filter...but the problem is still there. I may try some new fuel, but the other stuff I'm using is not so old.
Ant other suggestions? I don't know if I told you, but the engine is mounted upside down...its in a corsair.

thanks again