What it the best way to remove the bowl that probaly hasnt ever ben taken out. My shut off handle is broken off and wont turn with vice grips. Its frozzen up. I was going to unscrew the bowl out of the gas tank and I cant find a place to put a wrench on it. I have a aftermarket bowl on my other A and it has a place to put a wrench. I dont want to break it off in the tank. The tank is empty and I sprayed the inside the tank where the bowl screws in and the outside with PB Blaster hoping it will loosen it up. Whats the best wrench to put on it? Im thinking maybe a pipe wrench. Can you get new shut off valves to rebuild the old one? Thanks.