I have a 2000 Chevrolet Suburban with 80,000 miles. Last summer, I started hearing a humming sound coming from under the truck. It seems like when it got warmer, or the longer period of time that I drove it, the humming got louder. I asked a local repair shop and he said it was probably my fuel pump. He said I didn't need to change it right away because it could still last a long time. When I brought this question up with some friends, they informed me that Chevy trucks all have a loud humming sound coming from their fuel pumps. They said I could put in a new fuel pump and it will probably make the same sounds. Is there any truth to this?