My duallie with 105K on it died & will not restart. It shuttered & shut off. Had it towed home, changed the Cam Pos Sensor & fuel filter. Checked for codes today with a Snap On machine & it is clear. Cranking pressure is over 2,000 & the tach rises when cranking. Unplugged the ICP & tried. All fuses are good & oil is full & clean. cranks with a little white exhaust smoke but no start. Where should I look next?

fuel pump run? Fuel pressure? How much fuel in tank? They are known for fuel pickup in tank falling off and not picking up past 1/4 tank.

About half tank of diesel & the tank pump works.