[Oldsguy]

Well, contaminated fuel will do it. No there is no drain plug but you can disconnnect the fuel line and drain most of the fuel that way. Of course you may have rust in your tank and it would be a good idea to check that out. You may have to do a complete tank removal. About the smell from the breather, that MIGHT indicate a blown head gasket, which would associate with the engin overheating. How does the radiator fluid smell and look? A compression check would help there. Sounds like common problems with the older cars, you are well on your way to conquering them though. Good luck.