Since it was mentioned that the spin-on fuel filter is hard to find at regular auto part stores it can be a good idea to keep one in the trunk of the car. I mean you can get a bad load of fuel and it pretty quickly can plug up filters.

People have also said that if you get fuel with a lot of bio-diesel fuel mixed in it that it will clean your tank and fuel system and to have extra filters for that eventuality.

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84 300D, 82 Volvo 244Gl Diesel