Well guys, and you specially you Mr. whunter, thanks a million, the spin-on filter was blocked, even to the point i ran the engine just before changing filters and as I removed the orifice bolt and the filter came loose, it hissed like a vacuum cleaner, the injection pump was trying like a dog to pull fuel past the element to the point of plenty of negative pressure. this also begs the question is my primer pump getting tired? I wonder if it would have helped overcome some of the back pressure if it were new? Anyway a million thanks to all!

Interesting other issue, the inner flat seal on the top of the filter was torn and deteriorating. there were some shreds of rubber in the orifice bolt when i removed it. Yes, the orifice bolt has two o ring seats vs. the newer style with only one. I bought a replacement about a year ago for my 95 124.131, the emergency shut off was leaking like a sieve and was over 80 bucks new, i replaced it with a straight bolt that was only 7, and it DID NOT have the lower or inter o-ring seat.

Filter time in service was 17,000 and 24.5 months. Mann WK817/3

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Mark
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THE WHITE FLEET
2016 GLE300d 4-MATIC 38K BROWN!
2012 S350 Bluetec==94k WHITE

2007 ML320 CDI==166K WHITE (FOR SALE)

Under new management:
2005 E320 CDI--140K--WHITE
1995 E300-Diesel-133.5K--THE CAR IS BLUE
1986 300SL--97.5K (European) AND WHITE. Back in Europe!
1991 190E 2.3-73K California Perfect.--WHITE
1995 E320-Wagon-159K--WHITE (recently scrapped)
1987 300D Turbo-213K--WHITE
1987 190D 2.5 Turbo-288K--WHITE