Humming Sound Around the Tailend?

[Ieatcamaros]

If it's pretty loud or distinct, then I bet your pump is on it's way out. Some pumps are just plain noisy, though. Stick your ear up to the filler door and listen to the pump running while the engine is running. Is this the same sound you hear? Another thing is, your fuel pump is designed to come on when the key is turned on. It should run for about two seconds. This is priming the fuel lines. So sit in your car, turn the key on and listen for the pump to come on. If it primes for much more than 2-3 seconds, I'd be thinking about a new pump in the future. Especially if you count it again a week or two later and 2-3 seconds turns into 3-5 seconds.