Hi! My husband has a 1984 300DT which was running and great up until last week. He took the car to work and when he went to start it at the end of the day it wouldn't start. One of the glow plugs was cracked so they replaced it but it still wouldn't start. After a few hours and no luck starting it they started it with ether and it started right up.

Here is what he did so far.

He changed all the glow plugs, changed the air filter.

He changed the 2 fuel filters and bled the fuel lines, and it started right up but then after sitting over night again...no start just cranks.

He cracked the fuel injectors open (while cranking the engine) to bleed air out of the lines and it started right up on the 1st one but then after sitting over night...no start just cranks.

Then the next day he bled the rest of the injectors and it started right up again but fuel leaked from the 1st injector so he tapped it in more and it stopped leaking but still after sitting over night it won't start.

He's also getting white smoke out of the muffler.

Once he gets it started it will start again and again, even up to an hour later but when it sits overnight it won't start in the morning it just cranks.

Any ideas on what to try next. Thank you for your help!