I put in new fuel pump, ran fine, quit once again then started, was showing it to sell, quit again, 2 days later it started, put it in shed and it quit again, put in new relay and bypassed inertia switch, still not coming on with turn of ign. switch, relay clicks a second time if I stick a test light on hot out, voltage is very weak at tank connection----ground problem?---I can run a hot direct to fuel pump and it runs constant.