My line reversal advice is the first thing told to people who need to diagnose a clogged tank strainer. It's not the worst thing you can do, it's diagnostics. If anyone thinks that's a final fix they're wrong. If it works it means you have to remove the tank and clean it.

Also, if the crud is big enough to get stuck on the tank strainer, you'd be out of your mind to think it can go through the 10 micron secondary filter and into an injector... That just isn't going to happen.

What I've done in the past is blow out the strainer like described, and dose the tank with Clear Diesel by Power service. VStech had excellent luck with it in his 190D as well.

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'84 190D 2.2 5MT (Red/Palomino) Current car. Love it!
'85 190D 2.2 Auto *Cali* (Blue/Blue) *sold*
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Oh make no mistake, I'm going to do it. Might get another main filter on order first... I've seen big crud turn to lot's and lot's of fine particulate crud in one of our flow calibration systems.