Loud Knock + Dark Smoke Start & Stop While Running

[kh99]

Thanks again for the great replies.

Added some ATF at about the 1 cup ratio and that seems to have cleared it up. About 5 hrs working and issue did not reoccur.
So hopefully it was just a fuel problem.
Plus my injectors should be good and clean now too.

Yes I'll have to shop around for different blends of diesel.
Surprised there is so much variation without some kind of rating system.

Or is there some rating / marking on the pump that I am missing????

 

[normde2001]

Just replace that $3 fuel filter and bleed the lines before going any further.

 

[KV60]

Its happened to me a few times. Probably water in the fuel

 

[MJPetersen]

Most of the water should separate out in the filter--there is a very small amount that stays dispersed in the fuel. Most likely it is a sticky injector.

Mike