Using the existing petroleum marketing equipment certified by Underwriters Laboratories or other nationally recognized testing labs, it is unlawful for retailers to store and sell any fuel with greater than 10-percent ethanol or more than 5-percent biodiesel using existing equipment," he said. "Retailers must use equipment certified as compatible with the fuel they are selling."
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 (The success of the biodiesel fuel industry relies heavily on biodiesel testing <http://www.youtube.com/watch?v=s32Ke2VzrqU>, not only at the production level but at the consumer level, where degraded fuel may cause engine failures.  Of major concern to diesel and biodiesel users is the very real possibility that water has contaminated their fuel. (See http://www.youtube.com/watch?v=0YcczdvPyAk).  The potential catastrophic impact of this problem is discussed at length  in this video at: http://www.youtube.com/watch?v=-lh4qhXc_5s&feature=youtube_gdata.
Fleet Fuel's  family of inexpensive biodiesel test kits  is just a click away on the internet at:
<http://fleetfueltesting.com>)