) and heat the nut on the end of the filter and the nut on the tubing until when you drip a drop or two of water on it you get a nice sizzle. You will boil the gas in the filter, that's ok. Then do the other end, and then quit for the night and let them cool all the way back to room temperature overnight. In the morning soak them again with Kroil. Do the heat again the next night, and again let them cool overnight and soak with Kroil. Next night heat them again and try the wrench gently with everything hot. There are rubber orings in each fitting that might start leaking with the heat, so once you start the heat don't turn the key on until you get it apart. Might be a good idea to unplug the fuel pump back under the rear bumper and run the engine until it stalls, to empty the line as much as possible, too. Murphy's Law. 
