how do you change gas senting unit thats in the tank do you have to drop the gas tank or can you get to it in the trunk

First Gas Fumes are very flammable, keep hot lights and sparks away. This lock-ring & gasket O-ring holds the sending unit in the tank. if you have a drain plug you can drain the gas tank there, if not it would be easier to take tank out of car. The ring can be carefully turned by using a punch and light force from your hand or a small hammer. Again be careful Gas fumes are very flammable. The sending unit grounds through the lock-ring so be sure to have a clean serface on tank.