I can prime it 2 times sometimes 3 but usually second prime and fires right up. And this is warm, after about 20 mins of engine shut down to about 2-3 hours. After that fires right up first prime. And it's just a longer crank when warm. Never not started on me.

 

Getting ready to decide on injectors or fuel pumps first. Any thoughts?

 

Some folks have suggested clamping off the fuel return line to eliminate the fuel check valves as a possible root cause.

If the pressure still bleeds off it's an injector problem.