I have sprung a gas leak around the petcock.I replaced the o-ring where it hooks to the gas tank and also there is an o-ring I replaced in the bottom of the petcock(gas shut-off system).It looks like the leak may be coming from where the on-off-reserve **** is attached but Im not sure.Has anyone else had this problem.I replaced the on-off **** with a machined aluminum **** so I dont know if the plastic one sealed off or not but the problem didnt arise immediately after the change.Thanks for the help.