I am so sick of having fuel leaks

Just to make sure we're on the same page: Mechanical pump? You've got male NPT pipe/inverted flare fittings that thread into the body of the pump, right? You can use teflon sealer on the pipe threads that screw into the body of the pump. The inverted flare side should not use any sealers. Use two flare nut wrenches to tighten the nut (fuel line) to the fitting.

Recently I had trouble with a couple of leaky flare fittings on a carb - everything was new. I lubed the threads and the flare mating surfaces with a little petroleum jelly. Snugged them down again - problem solved.