06 D12 hard start

I am dealing with a problem with prolonged start on a 06 D12 engine since it became colder in the midwest.
Already checked for fuel leaks and replaced the water separator filter, main fuel filter, fuel return valve, installed new priming pump assembly. I don't see any bubbles in the fuel tanks while engine is running nor any bubbles in the water separator sight glass. Also there is no coolant leak or overpressure in the surge tank. Priming the fuel pump does not help, after a couple pumps the plunger becomes stiff.
Any ideas would be greatly appreciated
Batteries and starter are good. After sitting overnight the engine struggles to start as if there is not enogh fuel in the head, sputtering and blowing white smoke for a second when starting.
No codes on the dash or ToolTech

 

Try this don't know if it will verify the problem ( I believe it's air in the line or losing its prime) Have your tanks filled to capacity when you shut it down & see if you still have a hard start when you fire it back up.

 

I don't know for sure just a suggestion. More diagnosis has to be done to pin it down.

 

Any diagnostics I can do to pinpoint the problem

 

Anybody in Chicago area that can take a look at this?

 

Anyone in Chicago area that can take a look at this?

 

repost

 

Sound like a bad injector cup

 

Your best bet for Chicago land is
nasriza

 

I have a similar problem and I have changed almost all fuel parts and my truck still refuses to start