I got my engine to start about 3 months ago but was having trouble keeping it idling and it was rough idling and would stall out if not giving any pedal after awhile. It was rebuilt top to bottom. Now i have changed out injectors with another set i had on the engine when it was running a month prior to rebuild just fine and same issues. Change my rebuilt pump from about 2 years ago which was working fine a month prior to rebuild (only was off for a month and a half and stored with diesel) with 2 other used pumps i have on hand which were running pumps but were not stored properly as they leaked and were there for cores or rebuild. Same exact issue persist through all three ip. to rule out the tank and filter i ran off a bottle of diesel right to the pump with same issue still persisting. The truck smokes white smoke as it seems to be getting to much air and not enough fuel. I have turned the fuel up on the pump and have gotten the idle to smooth out and the white smoke to go away at idle but when hitting the pedal it does not want to go back to idle which i guess is from the injectors getting loaded up with to much fuel. when set to stock setting for fuel it takes for ever to start. With fuel turned up it cranks right over with out much help from glow plugs and idles really nice as long as you dont hit the pedal and cause it to run on.
The only gasket i have not replaced was my intake gasket as it got misplaced and i am going to replace that gasket this week just to rule it out being an issue.
My mechanic think the injection pump is bad as the engine does fire on all cylinders as long as its getting fuel.
Wanted to get some opinions from others who may have more experience in this. I hate to shell out the cash to find out the ip wasnt the issue.
Any ideas would be great and if you need any clarification on what i described dont hesitate to ask. i am writing this rather quick as i am in one of my IT classes.