If your fuel system has two filters, the primary one is usually about 10 microns cause the fine mesh secondary will catch anything finer than that. If it was a single filter systems (used for a couple years around 2004-2005), the finer filter would be required. As far as I know, all 2011 chassis have two filter fuel systems, cause that's what Cummins specifies now.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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