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This is my first tank of e-free gas since the chirp developed. 1/4 tank into this one, and no chirps. I was reading an article (of course I can't find it now) where there was a discussion about ethanol mixes being a "dry" fuel as far as lubrication , and less sulfur meant the fuel had less lubrication ability for things like pumps. Dunno, but e-free gas DOES seem the cure the chirps. The pump may still be faulty but quiet. SOMEBODY with the savvy to do so PLEASE take a pump apart.
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