Capt: Guess you have discovered this from this experience. Do NOT affix the tank in such a way that is diffecult to remove. Best way is place tank loosely in place. Hopefully with centerline of tank as close to center of needle valve as is possible,(vertically). Wedge some foam around it,firmly but not too tight to hold in place. That then holds securely but still enables it to be removed if need be. 3 lines are totally unnecassary unless engine is cowled since fueling can be done by removing supply line when cowl not preventing that. Tip: when fueling uncowled engine have a small plastic bottle with fuel line, plus a vent to plug into pressure line (remove from muffler). That will catch excess fuel in bottle rather than have it go into muffler. Saves fuel also prevents flooding motor. Don't forget to put pressure line back on muffler.