Welcome kemo sabe,Here is a diagram of the 215 explorer...

looks like the fuel tank is pretty close to the fuel fill,I dont think moving the fill would help,check to see if there any kinks or places where the lines are pinched and correct.
as far as a hardtop goes the only thing you may notice when you get one is a lighter feeling to your wallet and the loss of maybe a couple of MPHs.I like my hardtop,rod storage and not to have to deal with the bimini straps and the rattling,hiyo silver!

:batman: who was that masked man?
ok fixed it,fill and tank in same place as the osprey