its alge/fungus... and thats a ***** to take care of...

Run some bioside through it, and be prepaired to replace many fuel filters, and possiably the lines...

~Nate

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95 Honda Shadow ACE 1100.
1999 Plymouth Neon Expresso. 2.4 swap, 10.5 to 1 comp, big cams. Autocross time attack vehicle!
2012 Escape, 'hunter" (5 sp 4cyl)