I did mine about a year ago, sorry no pics. I dumped the gas and washed the tank a few times with soap and water. Layed out where my sump was to go and scribed a line around it. Using a hole saw, i drilled about 6? holes in the tank where the sump would cover. I deburred my holes and then mig welded my sump on a little at a time. I plugged the outled holes on the sump and filled the tank with water to check for leaks. If no leaks , wash the tank a few more times to remove the metal shavings from drilling your holes. I threw a magnet in the tank while i washed it out. That helped gather up the shavings. Blow the tank dry, and you are ready to run.