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Old 09-06-2017, 12:26 PM   #1
Junior Member
Join Date: Aug 2017
Posts: 13
black tank flush lines

can anyone tell me where the tank flush line back flow preventer is located
for the black tanks on a 2018 sierra 384 QBOK. I put flow meters on both lines and still not getting any flow to the tanks. I have flushed the tanks many times by way of holding the toilet flush pedal down to flush the tanks after dumping black tanks. Also tried filling the tanks up several times past 2/3 full and flush and still cannot get any flow at the tank flush connections, I'm convinced the back flow preventers are in backwards.

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Old 09-08-2017, 06:50 PM   #2
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Join Date: Nov 2011
Posts: 19,906
Usually are installed in the bathrooms under the sink.

Otherwise, you might need to contact FR for assistance.
2018 Ram 3500 DRW/crew cab/long bed/4x4/4.10 gears pulling a 2017 Spartan 1245 by Prime Time
Checkout my site for RVing tips, tricks, and info | My family and I have fulltimed since June 2015
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black, black tank, black tank flush, flush, tank

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