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I just last week replaced all four flush valves on our 3910. All were three inches. I would look at blockage. Both our black flush valves had slow leaks, when closed, which allowed buildup to occur.
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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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