How can I check to see if my injectors are leaking .It wont start without starting fluid idles rough runs good after it starts p0236 keeps coming up and p1652 put new fuel pump in tank new batteries crank sensor air filter fuel filter still have to give it a shot before it will start?

 

Your rail pressure has to be around 4000 PSI before your injectors will fire. Giving it a shot of either lets the engine spin fast enough to do that. You probably have one or more injectors that are giving a high fuel return rate and causing it not to start.

 

For P0236:
Mopar1973Man's Dodge Cummins Articles - P0236 MAP sensor Too High Too Long
For P1652:
Mopar1973Man's Dodge Cummins Articles - P1652 J1850 SHORT TO GROUND

If it's only one injector issue, try to cap one injector at a time and start. It would start once the bad injector was capped.

 

So if one injector is bad I should change all six ? I live in central Indiana does anyone around here have any good used or where do I get new other than dealer would like to have A little more power I pull livestock and farm equip a lot .Also I have a quadzilla box on it anyone know anything about them .