Black Substance in Gasoline

Posted by Dave L On 2012/11/12 22:57:25

My '36 Packard has sat for a year with stabilized fuel. I have recently noticed that a black greasy substance collects in the glass bowl of the fuel pump when the electric pump is operated. When bowl is cleaned and fresh fuel is pumped into bowl, fuel becomes dark, almost black with little sediment -like fragments.
The tank was sealed a number of years ago with Bill Hirsch sealer.

Can anyone help! Could this be ethanol related? Any help will be greatly appreciated.

Dave L