As a short term solution, at least carry a number of replacement primary filters. They are cheap and can be replaced in less than 2 minutes. When the primary plugs, replace it. Combine this advice with the the suggestion that you switch outlet and return lines and you could drive the car indefinitely without cleaning out the tank.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13