Posted by jacks on September 05, 2015 at 18:32:09 from (74.110.231.137):
In Reply to: Re: Gas/Carb/Methanol posted by Gary Mitchell on September 05, 2015 at 13:35:43:
Gary, in a vented fuel system such as older tractors had, when humidity is high outdoors your fuel tank will get high humidity air trapped in the air space, and the ethanol will absorb the water from the air. As the ethanol/gasoline/water mixture sits a weak acid is formed. The galvinizing coating inside the tank contains zinc, which is one of the 'least noble' metals- in other words zinc (also used in carburetor bodies) will sacrifice ions to the acid solution and literally be converted to a zinc oxide paste over time. I live in a humid climate, and I learned the hard way that ethanol gasoline and older carbureted engines is a bad combination. I have disassembled several small engine carburetors that were all coated with the white-grey paste that you describe. The carburetor bodies were pockmarked with holes inside, and not rebuildable. I run ethanol gasoline in a 90's jeep with a nonmetallic fuel tank, nonvented fuel system and fuel injection and don't have any trouble. My advice is to drain the fuel tank, clean everything up, rebuild the carb and stick with non ethanol gas. A little stabil in the fuel tanks keeps the gasoline useable for up to a year or more.
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