Darin,

Mine is an 89 hatchback, so I'm not sure if the coupe is the same. I dont have a diagram, but I'll describe it here, and then take a few pics and email them if you want.

The tank is basically rectangular in shape. It mounts under the car beneath the spare tire well and behind the rear suspension assembly. The pickup and pump are mount about 1/4 of the distance from the right side edge. The tank is easily removed by unbolting the two retaining straps, the filler neck, and the few connection at the fuel pump/pick-up area.

It sounds as if this is very different from the S14 tank as you have described.

I hope this helps. let me kinow if you want some pics sent.

Jim

p.s. I'm looking for a 95-96 S14 for a driver (not race car, or rice car) Any problem areas I should know about?