Been chasing leaks for over a year now and was about over it. Boiling diesel fuel in well mixed with exhaust. In under a hour it was finished and I'm just a little, really a little, smarter. I'm a happy camper now even with all the supplies to reseal the injectors. I'm sure all this would of been half a day with a real MB expert and not the year I've been dealing with it. Hope this helps somebody. On a side note be careful of the fuel return line. I purchased by first line from an Amazon seller. Fast shipping but the size was wrong. It was 2.5 mm which leaked. Buying from FCP or Pelican will definitely get you the right hose size.