Aluminum Boat Frozen Suggestions For Removing Sender Unit From Aluminum Fuel Tank On Boat?

Suggestions for removing sender unit from aluminum fuel tank on boat? - aluminum boat frozen

The fuel tank sending unit (ARM) without sealing the connection between the sender and tank. The mounting screws define the sender solder are corroded in the tank. The mechanic broke a nail, and said he would not go! Suggestions for the release of locks, super strong, or I'm breaking the remaining bolts holding the sender and not filing or frozen bolts dremeling and realignment of the channel and the drilling of new? 1988 33 Egg Think-tanks are made of aluminum. I undestand that aluminum, when they pierced? Right?