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Re: [Shop-talk] Fuel system deposits

To: Steven Trovato <>
Subject: Re: [Shop-talk] Fuel system deposits
From: Pat Horne <>
Date: Thu, 06 Aug 2009 16:24:45 -0500

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.


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
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