I've had great results with 5 gallons of cheap old straight white vinegar (filling the tank absolutely full) - fabbed up some metal plates to seal the petcock and fuel sender openings, added EXACTLY 70 drywall screws (made sure I had 'em all when I was done) gave the tank a good shake once in a while over a period of a few days, drained, flushed, dried and Marvel Mystery oiled it. Like cajun31 says - process works great! Pretty sure I learned all this right here from you guys.
P.S. white vinegar $2.79 / 4 litre (just over 1 US gal.) x 5 = $13.95 (Cdn)
P.S. white vinegar $2.79 / 4 litre (just over 1 US gal.) x 5 = $13.95 (Cdn)
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