As babymog said; if your Fuel has become contamineted by something growing in it or just bad fuel from the Pump a Filter can clog again quickly.

You often see in Posts something like; I just change my filter last week and now I have the same problem. What is wrong?

To see if it an issue with the Fuel Tank Screen you can swap positions of the Fuel Return Hose and the Fuel Inlet Hose. However, if you do they the Fuel will be drawn from a higher position inside of the Fuel Tank and you need to keep the Tank above 1/2 full so you do not run out of Fuel. Just do it to test.

To see if it is a restricted Fuel Tank Vent try driving without the Fuel Fill Cap on; but, do not do that on a full Tank of Fuel. Don't want Fuel blowing out on the paint job.

If you still have the Old Filter you could cut it apart and take a look at what is inside.

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84 300D, 82 Volvo 244Gl Diesel