2005 C50T has power at harness connection to fuel pump relay but no power at harness connector to fuel pump. Relay checks good, according to Clymer manual test. The wiring diagram shows a yellow wire that leads from the pump to the ecm and also to the relay. I am guessing the ecm activates the pump through this connection. Does anyone know a way to fault check this, or does anyone know what my next step should be? The engine will start and run with starting fluid, which claims to have upper cylinder lubricant, but I am skeptical and used it very sparingly. Also, the pump operates when voltage is applied to the tank wiring. I will appreciate any thoughts or recommendations.