Most likely the hand pump is shot and allows air to leak in while the engine is running. This has filled the filter and IP with air, and it' aint' gonna start until you get fuel into the injectors again.
Here's what I would do if you cannot get a replacement hand pump:
Remove main filter and fill with diesel fuel or diesel fuel treatment. Re-install and open either the bleed screw on the IP (if you can find it) or the fitting for the return line. Don't remove the fitting, just loosen the bolt to bypass the pressure relief in it.
Rig up a containter of fuel and some fuel line so you can gravity feed the hand pump -- just a quart jar and some hose may work -- hold jar well above engine level with the hose going down to the hand pump. Try pumping how -- with a little luck, the pump will provide enough suction to get fuel up over the top of the jar. If not, fill the hose and stick it back in.
At the very least, you should get fuel leaking out at the pump now.
Pump like all getout -- you should get fuel at least dribbling out of the IP.
L
osen the injector cap nut about a half turn (17 mm wrench).
Tighten fitting, and will still keeping your "tank" elevated, crank engine -- the lift pump will push the fuel through even if the hadn pump leaks. When fuel starts to run out of the injectors instead of air, tighten the cap nuts and attempt to start. Should go pretty soon.
You will need to charge the battery at least once for this exercise.
Peter