Clogging usually isn't immediate, unless you've got some serious build up in the system. Biodiesel is a solvent but it's a weak one, so things have to soak a little before then break loose. Depending on how grimy your tank and fuel lines are it make take many, many tanks or it may take only a few.
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Andrew '04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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