Steve,
I'd suspect the fuel pump diaphragm. I had a boat on which the fuel pump
died after running alcohol-containing fuel. It didn't shed stuff, just
got hard and wouldn't pump.
Peace,
Pat
Thusly spake Steven Trovato, On 8/6/2009 3:02 PM:
> I have a boat that has been having fuel system problems. I have been
> finding black flakes in the carburetor bowl. The screen at the carb
> inlet seems to have develop a black coating. The pieces look like
> carbon paper. The question is, where is this coming from? The pieces
> in the bowl seem way too big to have ever made it through the fuel
> filter and the screen. And the deposits on the screen look like they
> formed there, not like little bits that just got trapped there. I
> live in NY, where fuel is oxygenated, usually 10% alcohol. The boat
> is a 1993 model. Manual warns against alcohol in fuel, but without a
> time machine, there's not much I can do about that. I suppose the
> hoses or fuel pump diaphragm could be deteriorating. I've never seen
> deposits form like that, and I can't see how else such large flakes
> got there. BTW, fuel tank is white plastic, and the engine is a 5.0l
> Ford with a Holley carb. Any theories? I wish I could send some of
> these flakes off to the CSI lab. Thanks.
>
> -Steve Trovato
> strovato@optonline.net
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