Don't drop the tank. Several external back flush connectors available from Amazon or any rev parts source, using a hose to back flush. Connect between the hose and the tank outlet and work great, better in my opinion than the OEM flush.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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