Take a look at how the hose hooks onto the evap switch under your hood or refer to a post about doing a fuel pump. The oval clip that needs to be squeezed into a circle to come off is what I'm referring to.
That oval clip that gets squeezed is how the drive shafts under the seats are held in place. If you find the correct one and unhook it.. you can then use a drill to drive the shaft and move the seat forward. However..I have ... successfully removed seats in a JY w/o power and while the bolts were tough to get at. Ratcheting wrench with pivoting head is all you need.
