My filler neck. JW51, your filler neck looks almost horizontal to the vertical cab metal. Can't tell if your neck grommet is rotated wrong or what? Also it would be nice to see an interior pic of filler neck connecting to the to the tank. If the tank is the same size as what we would expect, I wonder about the angle and length of the tank's neck which the filler neck connects to.
That has long been my theory. The tank neck is too long and/or at a slightly wrong angle.
I’ll get an interior pic posted here this evening.