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Actually, the flush line from the black tank isn't routed uphill from the tank as they just toss it in the bottom of the frame...so it remains full of liquid black tank contents for the first 10 feet or so. Yes, it does eventually go uphill and to it's high point under the bathroom sink or in the shower wall. When I replaced my black tank rinse fitting, I found out how much sewer juices were in that line. I removed the brass close nipple that screws into the plastic rinse fitting and put a check valve in its place.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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