1997 GMC K1500 fuel pump and sending unit replacement

[AJCK87]

Hey guys,

I'm looking to do a drive way fuel pump replacement and I don't really want to drop the fuel tank or lift the box off. Since this is the second pump to go in less then a year... I wanted to cut an access port in the box to change out the pump. I was wondering if anyone had a good thread showing how they did it? Also wanted to get an idea of how big a hole and where it should be.

Thanks!