My bro picket a 1980's BMW for $300.

He reckons it had been sitting stationary for at least 10 years and the remaining fuel in the tanks smells like turps.
It has also turned some of the rubber parts inside the tank (not the hoses) into black goo and would like to know if it is decomposed fuel or turps or something else has been accidentally put in the tank

He has a vid about it on his Youtube channel (FangitJoe) YouTube skip to about 9:30 if you just want to look at the goo.


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