oddshot
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VERY useful post. This is turning into one of those threads that will get cut and pasted into the back of my log book.You can visually identify any of the suggested problem areas.
Do not just change things and hope. You can easily diagnose all of the items mentioned.
The HH, remove the shutoff cover and turn on the in tank pump and you will see if the HH orings or tappet shaft are the issue.
The FDC, remove the bolts holding it onto the housing and turn on the in tank pump, look for leaks underneath it.
The Boost pump, the same.
The flame heater, can only let fuel into the oil if the it leaked enough to fill the intake side housing up to the shaft height and it wept past the sealed shaft and then ran into the oil return port. 99.95 % unlikely(nearly impossible). Flame heater nozzles are known to drip and can be repaired with new o rings. Remove the intake tube and look at the turbo impeller, if it looks to be soaked and fuel runs out when you remove the intake tube, that would show a total failure and possible point of fuel introduced to the oil. This is very unlikely and not one person has ever had this happen(and post it on this site in about 7 years). Personally, I would not even consider this a possibility.
For the record and for anyone who needs them, does anybody know where these various seals can be purchased?
How about the correct "by the book" names, if any, of these seals so we don't confuse the guy at the parts counter.