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When the tank is OK but the sender fails, this is the way I deal with it unless the customer prefers otherwise.

These dimensions are good for ANY 51-56 passenger car and limo. The horizontal dimension is from the inside edge of the spare tire well, and the vertical dimension is from the beginning of the pressed in ribs.

Do not kneel on the trunk floor while cutting, and cut very shallow.

I weld 4 little tabs on the "door" to support it in the floor and put a bit of duct tape around it to seal when done.

Total time for a "replace the sunken float" repair was about 45 minutes.

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Thanks for posting measurements. Am sure the info will be appreciated by someone who needs to change the sender and doesn't relish dropping the tank.

I made up a pumping station that would empty the tank. Then removing it was very easy. Of course if the car has an electric pump, it can be drained directly. Modern cars are a lot harder to remove than most Packards.

You can call me paranoid if you like, but at least call me concerned. What about the risk of fire or explosion when using the cutting wheel? Lots of sparks flying around in an area where fuel fumes could be, especially if there is an undetected leak.

Now all you need to do is put some flanges on the scrap metel piece as well as a hinge on one side, reinstall it with the hinge and you have a door to protect the sending unit from trunk debris!