Originally Posted by
neader
Hi Recently got 1997 F-250 7.3 and been making my Owen bio-diesel and have burned about forty gallons so for. Changed the fuel filter today and was surprised to find so mush Dirt rust even some water in the fuel filter bow.
Is this common or do I need to clean my fuel tanks soon 
Welcome to FTE and the bio forum!
Biodiesel is a great solvent and will clean all the crud from your fuel system. Just make sure you keep a spare fuel filter around for awhile and you'll be fine!