bbq: I need to know how to take a propane tank off a bbq. it is an old propane tank.|||turn off valve on top of tank clockwise tight use a rag its greasy. loosen propane connection clockwise a little bleeding off any excess gas note should stop making hissing noise in 1-3 seconds if not valve not shut off. make sure then remove gas line take out tank.|||If I remember correctly it has a left hand thread. So turn it clockwise to remove.|||turn the knob to the off position- righty tighty turn where the treaded hose connects to unthread it - lefty loosy...it might be on there pretty good.|||Turn off the valve and turn the hose fitting right to unscrew it. it should be a 7/8 or 15/16 wrench.|||Close the valve on the tank then unscrew the pressure regulator from the tank.