Hmm - bet someone filched the cap outa yer kit cause someone lost theirs lol, I've been meanin' to replace mine cause I hates it (can only fill tank 1/2 - 3/4 or it'll spew), still haven't done it yet cause Ima slacker
Cabinfever suggested this;
Originally Posted by Cabinfever1977
i actually do have a part number for a rubber/plastic cap(non vented) from Napa.
its a oil filler cap and you can make a hole in center and put a tube for venting.
Welcome to the forum Sparks!