It is possible to mount the pumps in a RV tank using a stock fuel pump / holder assembly from a Ford EFI car.  Some Ford vehicles use an in-tank mount that is 'L' shaped; ie, it can fit in the outside/end rib and make the turn so the fuel pump is vertical.  Unfortunately, I didn't write the model/year of the auto that had this particualr mounting scheme but I think that it was from an early 90's model full size like a Taurus or Crown Vic; also might have been a Lincoln of some sort since the junk yard I frequent mixes the models.  I knew I should have bought a couple of these but I had about decided to use external pumps like everyone else - now back to plan A and I will be using intank fuel pumps.

Ken Powell