A torch on a fuel filter?!?!?! Are you sure he's a friend??? Get a can of PB Blaster rust penetrant, spray it liberally, wait 5 minutes, and spray again. Wait 5 more minutes and it should come right off. If you unhook the quick disconnect side first, you can hold the line nut with a wrench, and spin the filter which seems to help in breaking it free. Plus, if the line nut is rusted to the line itself, you wont kink or twist it off. Good luck.