Cat 3406b won’t start when hot

It has 40-45lbs at the fitting at the filter. It does drop of rather quick when it’s shutoff but comes right back up as soon as you start cranking. I put plungers and barrels in the injection pump and that made it run better at really low rpm but still doesn’t start hot. Ran the overhead thinking maybe the valves were tight and when hot, everything swelled just enough to hold them open but no such luck. Even tried putting a nurse tank up on the cowl and drew the fuel straight from it to eliminate the pick up tube in the tank. Really starting to run out of ideas.

 

I’ll try that tomorrow. Thank you

 

Pushed the rack bar back, it moved 1/2-3/4” and it started. It moved very easily. Now that I think back this started not long after I switched engine oil. Always ran rotella 15/40. Got a “deal” on a bunch of Sinclair 5/40 synthetic. Don’t know if that really effected anything or not. Thank you very much to wore out for pointing me in the right direction.