I can't see how it would hurt anything you would only be moving it a couple inches, it would still be on the far end of the rail.
If everything bolts up it wouldn't hurt to try, you might spill a little gas at most, it couldn't hurt the motor any it will still get fuel no problem.
You have to pull that endcap off and see what it looks like, I have never had it off, as long as the surface will compress the o-ring and seal and still let gas through the center it should work.