Hey,

I ran low on fuel so the light came one. No biggie. Coincidently I checked under the hood to try to fix my shaking (posted in another thread), I saw that my secondary fuel filter was blackish. No biggie again. I took out a brand new filter and changed them over. The fuel that went in was again blackish in color. I'm kind of puzzled as there is no crud except the color change. Is it just all the dirt from my fuel tank or is it algae ? I change my filter every oil change so that other used filter wasn't that bad.

Oh yeh...when i poured the diesel out of the old filter it looked new again.

Thanks

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Audi TT