How do you change a fuel pump in a 82 Chevy?

Well i don't think its in the tank, you are probably running a mechanical one off the block. Follow your gas line from the EFI to the pump, it is usually on with two bolts and slide it out. make sure you look to see if the pump lever is in the down or up position when you pull the pump out. if its in the up position you can put some grease on the top of the lever to keep it in place when you put the new one back in. You are lucky, its normally way easier than if its in the tank.