Dropping the fuel tank on a 97 Tahoe, how do I unhook the fuel lines from the pump?

Depending on tank size the lines are attached at different locals but all disconnect the same way-drop tank low enough to see where lines attach to sending unit-if your doing this on the ground you'll need to drop drive shaft-disconnect filler tube and vent tube(this is easier when tank is all the way up-they look like radiator hoses and can be very aggravating to remove)when removed siphon as much gas as possible out of tank-disconnect any evap lines then drop down and the lines are a hard plastic snapping into metal-there will be a clip usually white but have seen black on the ends of plastic line-look at them and you will see they expand out and catch the outside of the line-push the plastic line towards the hard line then compress the clip in towards the hard line then pull on plastic line with even force-it may take you a few tries till you get it-the clip will stay on the sender lines- make sure if your replacing pump make sure clips are on hard line before installing.

I just replaced my fuel pumb inside my fuel pump inside my gas tank a couple of months ago. There was no special tools needed. On your vehicle, you could buy a Haynes repair manual on you make and model and it would show you exactly what you need to do.