yes , with the supply unhooked , to blow out any chunks or tank debri , or crap in the lines. if there is rust in the tank, it will be never ending. you can usually, immediately tell if the gas is even remotely lightly orange tinted. i have had rusted tanks, and they are nothing nice.
its been awhile since i bought one of those little guys, i dont recall if it was a Mr Gasket or not, but it worked good for me. i found a brand new carter for dirt cheap, and plumbed it in.
