Hey guys,
need some help with this one. My truck was in the driveway all day, didn't even start it up, I came home from town on sunday and heard a buzzing noise on my truck. I walked around to the driver side and popped up the hood. I could still hear the noise. I got under the truck and the noise was even louder. I grabbed the high pressure fuel pump and it was on. The key wasn't even in the ignition. I had the key in my pocket. I was on my way into the garage to get a wrench to take the battery cable off when it stopped. I got the keys and started the engine and it ran ok. I have looked for a short in the wires but can't find anything. The pump wasn't on when I went to town.

Any one have any ideas what could be going on?

Thanks
Racer88