This is a very common problem... as the poster above said look at the filler tube. No look (if you can) at the one on your car.. I can't do a decent job of ASCII Drawing but
car
\
\
. Tank
Motor home
----_______ tANK
Much longer tube and not much "slope" the result is if you have a lock on pump even the 1st stop may be too fast.
A piece of wood like quarter inch. Cut in stair steps.. You may find a position that works.
ALso if you can tilt the RV away from the pump
And if you have dual fill (Drivers and passenger side) open both gas caps (don't forget to replace both)
