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I blew the head gasket on my 8011. To fix that I had to remove the fuel tank, take the head off, get it resurfaced and valve seats ground, new valves insertted.
Then. I stripped the injection pump after watching a tutorial on YouTube on " motorpal" search result.
Thisbrought me to a video where a guy on Russian strips the pump right down, it's ok to follow him.
Once stripped take the old o-rings to your seal supplier and get new ones . This hopefully stops your diesel leaks and possibly saves you a costly rebuild. Or to I hope, my newly rubbered pump is going in in about a week.