Apparently there is a way to adapt it for 90*. Found these under their FAQ section.
Q. How do I use this for automotive or motor home use?
A. The downspout of the F-15 is the same size as 1" PVC pipe which can be added to reach any fuel tank. In line on/off valves can also be installed for more control. (If PVC pipe is used, a bonding wire should be attached from the funnel to the filler neck of the fuel tank to control static problems.)
Q. Won't using the funnel slow me down at the pump?
A. Yes. But you can use the funnel as a testing device if you are going to transfer a large quantity of fuel. If you are going to pump 150 gallons test the first 5 or 10 gallons and inspect the bottom of the funnel. If no water or contamination is visible in the funnel, pump directly into the tank and make another check at 50 gallons and 100 gallons. Usually if there is no contamination to begin with it means that the vendor is taking good care of his filters and you won't need the funnel. If, however, you find any contamination you are better to slow down and use the funnel for the whole refueling process or go to another source.
Formerly had 07 Neptune 36PDQ, ISB 325, Allison 2500, Source Trailing Arms and Ride Enhancement Kit, Demco KarKaddy 460SS.
Currently no Motorhome