HELLO....
I'd appreciate information if you can offer some insight...
....i own a 2003 with 25,000 miles.....i bought it used at around 22,000 miles...i noticed a hum coming from the fuel pump...granted it was not a loud noise..but an annoying hum audible at slow speeds or in park...
...i asked 2 vette mechanics for opinions...one said he could replace the pump with a new one and it will probably make the same "noise"...the second mechanic said a new one would probably clear it up...although he didn't think the one in the car was about to crap out..
...oh well....several hundered dollars later and a new pump installed...it sounds almost like the old one....after a long drive...it gets a little louder...i feel like it is in fact perfectly normal.....but since i don't know any other c5 owners i'm hoping to learn from here....does yours hum?..
....thanks for reading this and have a good one....Mike  

Yes mine and my wifes BOTH do.Most C-5 vettes do to.Just the way it is  

Fuel pump noise in C5s is not an uncommon problem. This stems from the fact that there are two fuel tanks and, consequently, two fuel pumps. One of the pumps constantly pumps fuel from the passenger-side tank into the driver-side tank, and this pump is very quiet. The noisy one (and the one you hear) is the main fuel pump located behind the driver seat that feeds gas to the engine. Unfortunately, this pump can be loud enough to be quite annoying, but there is a 'quasi-cure' that involves adding a foam fuel tank insulator pad (GM part number 12493728) and the installation procedure is outlined in Chevrolet Service Bulletin number 99-06-04-052. Your other option is to have a quieter after-market pump installed, and these are available from several sources.   Hope this helps you out.
Tom Benford
Corvette Fever
C5/C6 Solutions Columnist