Dan partially answered your question--while it seems brutal, the cleanest way of getting the banjo bolts out is with an impact tool. You'll still need to hold the banjo--vise grips--or the fitting will spin with the bolt head ripping the vinyl line (jam the grips against the mounting plate). Don't despair if the line does break--it can be replaced with a short length of fuel injection rated rubber hose. Use the type of clamps that don't dig the thread/slots into the rubber---I think if you ask for aircraft type clamps at a good independant parts house you'll find the proper ones. Be sure to use new copper washer seals.
Electric pumps are better at pushing fuel than sucking it so the pump is mounted near the tank (140's w/FI and early 240's had the pump right at the tank) and that's the reason for the tank mounted push pumps. The filters used to be mounted in the engine compartment (k-jet equipped cars) but having the fuel spill up there didn't seem like such a great idea either. The car builders don't take DIYers lyinig on their backs into account in any case.
One little trick learned from removing the fuel hose from the chassis hard line on original VW beetles--tie a rag around your wrist so gas doesn't run up to your armpit--it burns--I know. -- Dave