i just took another picture. the whole cylinder-shaped piece at the bottom of the petcock (which has a drop of gas at the bottom, which you might be able to see) seems to be wet. is it possible that the gas is leaking down from the petcock (at the arrow), instead of where the petcock meets the clear tube? if so, does that mean i probably need a new petcock? (i doubt i have the skills to take it apart and repair it myself.)
