Re: Fumes
the under tank petcock is brass on brass and can leak with scratches. I had to clean mine up. There are affordable replacements. The needle and seat are metal on metal and prone to some weeping of gas. if you have the tank drained clean or replace your pencil filter in the iron sediment bowl. The bottom threads out. use a crescent wrench(or appropriate size) on the flats above the bottom spinner. I think the spinner is a drain but mine is locked up.
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