Bird man,
Any way you can post some pictures of the problem you are describing???
A standard in-cab gas tank for your '52 should not have 3 "plugs" in the bottom of the tank.
There should be only one threaded port that your fuel line shut-off valve is threaded into near the passenger end of the tank that protrudes out of the cab floor.
Post some pictures and we can try and better answer your question.
Dan
