Bought a 1959 Hiawatha 7.5hp not too long ago. Appears to have been built by Scot Atwater from what I've found on line. I was having fuel issues as the motor runs fine for a few minute and then acts like it's starved for gas. Bought new ball and hoses but it was still doing the same thing. Checked the fuel filter and the gasket/diaphragm on top was ruptured. I've been checking everywhere but can't find anything online. Is their any good places that have parts for these old motors? The model number is OM3-7987B. About the only thing I've found is someone who made one of a nitrile glove. It's not regular gasket material because it does have a little give to it, almost like a hard rubber.