My 460 has what the wiring diagram appears to show, the starter switch can either be turned clockwise 1 click for heat, clockwise once more for heat+ start, or counter-clockwise for just start - The above diagram doesn't give fuse sizes, but that just seemed too small to me.
Guess I was wrong though - just found the fuse info on the 460, all fuses are 8 amp except starter, which is 16 amp. Yours is probably same, even the positions on the fuse block look to be same (at least, #1 is the 16 amp)
Have you tried moving the starter switch the opposite way to see if the fuse still blows? IF you have a shorted glow plug that would take out the fuse immediately. If starting WITHOUT heat doesn't blow the fuse, glow plugs are where I'd look.
Bleeding - My Case manual shows two different ways, one is similar to all the "monkey-motion" mentioned, the other was just to loosen the fitting right at the injector pump til fuel comes out, then tighten.
That method seemed kinda slow, so I ran an air hose into a regulator, turned down to about 4 PSI - I have one of those conical rubber ends for the hose, so I removed the fuel tank cap, drilled a hole in a plastic paint spray can lid, placed that over the fuel tank neck and (GENTLY) "encouraged" fuel to go.
Took about 2-3 seconds that way, tightend up the fitting at the pump and it started right off.
Haven't tried that on the Long, no need as yet. My 460 has a primer pump on the side of the block, owner manual says if it's been sitting a long time you should stroke the lever 20 times before starting. On mine, you can tell when it's primed because the lever has more resistance to moving... Steve