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I am not sure your problem is caused by clogged strainer. You would feel the car very sluggish at speed on freeway but OK at idle if the strainer is clogged. Add more diesel would alleviate the problem as it has more 'head'. Also you would see a lot of air bubbles at the primary filter. The lift pump would suck air from somewhere when it is starved of fuel. This is the experience I had with a OM603.
In any event, if you want to clean the strainer, this is what I did.
1) remove tank outlet hose and drain tank over night. If not you may find diesel all over you.
2) Remove the tank hose. You probably can reuse it as your car is only 1991. If not, cut open the hose clamp and replace the hose with a 3/8 ID fuel hose. It is easily done and save you ton of money.
3) Use a 46mm socket to remove the stainer. I always resue mine as there is nothing wrong with it except really dirty. I use engine or brake cleaner to clean it. Wash it with water and then blow dry with compress air. It is like new again.
4) Replace the o-ring. I bought a box of o-ring from HF for $7 and there are plenty in there to do all odd jobs.
Good luck.
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