I Hope you don't run the car on it, just use it to start fires or something/anything else... I kind of had a situation like that too, I got a 78 Trailduster for my sisters Ranch, she needed a kick around cheap 4x4, I found it only a few miles away, that had sat for 20+ years, in some ol' guys garage... I was pleasantly surprised/shocked more like... when I pulled the carb, filter, checked the lines & fuel tank, found almost nothing varnished at all, very little sediments either, just some powdery residue in the carb, blew out the lines, drained the tank & flushed it out, put new filters on it, one before the pump & one after the fuel pump before the carb just in case... I put a light down in the tank, I couldn't see any signs of varnish or corrosion even... It had almost a full tank too, smelled like rotten vinegar kind of... It was up in the Northern Ca., Red Bluff area, with dry & hot summers, with mild winters too... I cleared/cleaned the carb out, put new gaskets, in all new fluids in it, new seals & rubber everywhere in the fuel system, hoses, belts etc., changed the oil {it was like nasty a$$ sludge} & it fired right up, after I primed the carb, not even sure why the person parked it, it ran & still runs great, nearly 10 years latter now...
