No smoke is either no fuel or no compression, given that it was just running so can rule out other issues. Given that it pops on WD-40, it's probably no fuel. Just to be sure, the decompression lever is set to Run when you attempt to start it right? When you bleed the injectors, make sure the governor lever is OFF, not part or full throttle. It can look like you have fuel at the injectors and the transfer pump can be putting out pressure but unless it's squirting, then there's still air in it. Prefer to bleed using the bleeders behind the fuel pumps, rather than cracking the lines to the injectors - they only have so many retightens in them. Try putting 2-5psi air pressure in the diesel fuel tank and/or fill it up to the top. Just some ideas for you.

It's possible that your injector lines are blocked, and/or your injector nozzles are stuck open. In this case, slacken the injector lines at the injectors, and bleed there (I know I wrote before that this is not preferred but since you have good output at the pump bleeders, we need to verify that you have fuel all the way to the injectors). If you have good output at the injector union nuts, then try to start again. If still no smoke, try winding the main engine over by hand, to confirm that, regardless of where the decompression lever is set, you can feel good compression by hand. Sometimes the lever can be set in the right position but not be correctly setting the valve depressors. This likely isn't your issue since you haven't reported messing with that part of the machine, but it's still good to check it off the trouble-shooting list. Usually you can tell if the compression is correctly working because when cranking under compression on the pony, the engine sort of "jumps" a little and you can hear the difference between no compression and compression.The pony should noticeably sound like it's working when changing from no- to compression