"99 Z71 Fuel Pump

totally normal, these pumps run like 60psi so they are kinda noisey. the pump on my truck is very noisey. the sending unit is already wacked up and as soon as I get around to it I'm going to have the pump replaced under warranty.. I think the general consensis is that these pumps only last about 100K miles

Adair

I feel the need to "beat a dead horse". don't worry unless it stops whining. It should especially want to whine when you turn the key. I have 98 K1500 Z71 and just replaced last week at 108k. Your pump will probably go when you have a full tank of gas:( 100k is the magic #.

I wrote earlier this week that if the pump does go, you can sometimes get it started by hav>If the noise quits then you need to worry. It is normal for the whine.