Myth: Biodiesel causes filters to plug.

Fact: Biodiesel can be operated in any diesel engine with little or no modification to
the engine or the fuel system. Pure biodiesel (B100) has a solvent effect, which may
release deposits accumulated on tank walls and pipes from previous diesel fuel use.

With high blends of biodiesel, the release of deposits may clog filters initially and
precautions should be taken to replace fuel filters until the petroleum build-up is
eliminated. This issue is less prevalent with B20 blends, and there is no evidence that
lower-blend levels such as B2 have caused filters to plug. The Malaysia B5 Blend should make clogged filters a non-issue. THE END

Source: National Biodiesel Board