I will add more to this confusion. On my 49 the sender is just that, a bolted down cap with 2 wires coming out of it. My tank does drain from the bottom. However when I had my 53 the sender was different with a pickup attached but someone had put a cap on the outlet and brazed a piece of steel tubing thru that hole in the bottom. But there was a hole with a grommet going thru the floor in front of the tank.
Going back to the green book, although it says 1947-54 on the cover, the book is geared primarily to 1954. As an example check the sheet metal section and the driveshaft section. Nothing like a 47-53 in there. So maybe the drawing I mentioned in that book pertains to a 1954.
Are you confused yet!
