DennisM
Yes the fuel dumps right in through the cab floor.
My tank is directly inline with cab plumbing that goes from the filler through the floor just above the new tank. Also installed a leather gasket to allow slight movement of the cab up & down. Seems to work well. Check out the pics ffrom the previous post above.

These were the 3 reasons I went to this set up.

1. Stock looking filler on the outside.
2. Stock location for my spare.
3. Tank removed from inside of the cab.