Lakotah
Well-known member
My 99 C-5 has just turned 81K miles and for quite a few miles, I don't know 30-50K or so, I've listened to what I've gathered is my fuel pump. It's never been really noisy, just something I can hear. Well lately (the past 3 or 4 hundred miles) a new sound has come up. It sounds to me like a ball bearing that's starting to go out. At least that's what I can best describe it as. I've taken off the serpentine belt and manually turned and pulled at anything that will turn and I can't feel or hear anything unusual. I hear this noise at idling or just a few RPM's above that. One thing I do notice though is I can slightly smell hot antifreeze but see no signs of a leak anywhere and the anti freeze level always seems OK. I have to mention I replaced the water pump a few thousand miles ago with a quality pump. So I don't know, do these GM fuel pumps continue to get noisier as the miles increase? Oh, and I have to mention that I never abuse the performance that's available under the hood so I can't say it could be from my abuse. Thanks for any help on this.