??? 1st gen dodge cummins

[drycreekjeep]

it cranks great when its cold but after it warms up in warm weather it will not crank back without ether. if cold weather it will crank back up.???? yall got any ideas??

 

[TheViking]

I know starters use to not crank on old school big blocks after getting warm but the issues doesn't appear to be with the starter so I'm screwed on ideas. How about a pressure drop in the lines? The pump itself? My starting point would be fuel delivery.