Old Magnet
Senior Member
Me and my 80 year old brain have been thinking about your fuel contamination dilemma. It just occurred to me that what would be an obvious leak with old school stand alone injectors would not be so obvious when connections are buried under the valve cover.
What I am referring to is on a somewhat rare occasion an injection line ferrule may have split or otherwise not seal. To check it out:
1. Loosen the line nuts at the injection pumps one at a time with engine running to kill the injection pressure and see if at least one cylinder is loafing and not carrying the load.
2. Pull the valve cover and run engine while looking for a leaking line connection at the injector.
3. If you want to get fancy try the dye and light check like shown in the attached video.
Seems this would fill the criteria for the symptoms you've given. Please let us know if you've done this already or how it works out. Good luck.
What I am referring to is on a somewhat rare occasion an injection line ferrule may have split or otherwise not seal. To check it out:
1. Loosen the line nuts at the injection pumps one at a time with engine running to kill the injection pressure and see if at least one cylinder is loafing and not carrying the load.
2. Pull the valve cover and run engine while looking for a leaking line connection at the injector.
3. If you want to get fancy try the dye and light check like shown in the attached video.