Originally Posted by xlite
I'm not sure what "union washer" is but I cut my intake gaskets from cereal box cardboard and it lasts for years. That red material used on stock engines seems to melt very quickly. The cardboard lasts much longer.
Maybe your mating surfaces need to be matched better.
A union washer is a flat fuel resistant rubber washer that goes in the carb were it meets with the intake....It makes a good seal for factory carb's....I make my own gaskets out of gasket material....