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Old 09-26-2023, 06:55 PM   #1
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Join Date: Sep 2023
Location: Jacksonville
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M.O.C. #33285

Just purchased a 3761fl 2021 has 4 drain tanks 2 black 2 gray. Anyone know which is which.?
Bob, Kay and our 3 pups Lily, Willis and Gizmo
Jacksonville, Nc
Retired LEO of 35 years enjoying life camping n fishing
2021 Montana 3761fl pulled with a 2022 F350 King Ranch
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Old 09-27-2023, 12:13 AM   #2
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Location: Box Elder
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M.O.C. #12947
Best to just get some food coloring, put some in one of the toilets or sinks, and when you drain tanks, through a clear drain fitting you will know which tank goes with the drain pull that the dye shows up with. The next time you are draining tanks, do the same thing to another area.
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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Old 09-27-2023, 07:18 AM   #3
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M.O.C. #22835
Agree with rohrmann's post above. But, I'd do it a little different.

Drain all tanks completely then close all the dump valves. Turn on a faucet (say, the bathroom sink) and let it run for a couple minutes. Pull each valve and see which one drain. Mark that valve. Now repeat with a different faucet, say the kitchen. It would be good to test all the valves again, because you just never know how things "could" be plumbed. Bathroom sink and shower could run into the same tank with the toilet, and then, it might not. So check each water faucet, toilet, shower. Then you'll know for sure, because you sure can not trust any labels on stuck on the trailer.
Who you are right now is a sum total off all you use to be.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
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