I currently have the old screw style pump on my 300D. i noticed today when changing a fuel filter it's leaky so i'm going to replace it, but the new bosch pumps say they're not compatible with biodiesel. are there some internal seals that will break down or something? would it just necessitate replacing every 5 years?

i run blends anywhere from B20 to B100

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1981 NA 300D 310k miles