My cadillac is making a humming noise underneath the truck on the drivers side.

What is your question?

When I crank my truck I hear a humming/whinning noise from underneath you can hear it on the driver and passengers side. When you turn the truck off its hums for a little while then shuts off. Pleae help I hear it suppose to make a sound i hear it might be a vacuum line or my fuel pump HELP!!