My TRX 420 will crank, but not start. I drained and replaced the fuel, replaced the spark plug. There is not gas on the spark plug. I removed the gas line from the injector thinking if I tried to start it and the pump is working, fuel should come out. None did. I hear a click and low hum when I turn on the key. Now I'm thinking maybe the fuel pump relay? I've see this can be a problem with these atv's. Can anyone give me a clue where the relay would be? I searched replacement parts and cant seem to find what I saw pictured. Any help would be greatly appreciated.