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It has been a long time since I changed out a filter on a 240. I can tell you about my experience with the 940's. I don't think they are all that different.
I remove the pump and filter as a unit from under the car. I have a piece of 1/2" dowel, an appropriate size hose clamp and a pan at the ready when disconnecting the hose from the tank to the pump. My experience is that fuel will run out in a steady stream- the hose acts as a siphon.
I "bump" the connection of the pressurized fuel line with an impact to loosen them. There are "flats" on the filter for counter holding but I would not use them. The filter material is thin and the connection can be difficult to loosen/tighten.
After the fuel lines and electrical connections are off you can move the unit to the bench. If you don't have new copper washers you should anneal the old ones and resurface them on carborundum paper (#180). Those connections that are secured with copper washers have a tendency to leak. I use an impact to again "bump" the high pressure connections to insure they are tight. It is maddening to think you are finished with this task only to find a high pressure leak when you start the car.
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Any twenty minute job is just a broken bolt away from a three day ordeal
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