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Old 10-11-2018, 09:34 PM   #1
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2019 NP 377RLBH Black Tank Draining

When I drain the blank tank I have a ďglugĒ like pouring something out of a bottle. To me this means that the vent is not functioning as it should and it is sucking air.

Does anyone else with a 377 have this problem?donít know it itís common (caused by poor design) or limited to me and I have some obstruction in the vent stack.

Thanks
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Old 10-12-2018, 09:16 PM   #2
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Originally Posted by prm99v6 View Post
When I drain the blank tank I have a ďglugĒ like pouring something out of a bottle. To me this means that the vent is not functioning as it should and it is sucking air.

Does anyone else with a 377 have this problem?donít know it itís common (caused by poor design) or limited to me and I have some obstruction in the vent stack.

Thanks


That is strange. We have a 2017 377 and ours donít do that. Try filling the black up completely and then do a drain. Get a clear elbow for both ends of the septic hose to see whatís happening. You can also get up on the roof and check to make sure the cap isnít obstructed. Otherwise, a trip to the dealer is in store.

Another test is to fill the bowl full up to he brim and flush. How fast does it drain? Is there a large bubble or several trying to cough back up at you? If so, you have a vent problem. Sometimes we hear of the plastic circle cutout falling back into the tank at the factory when they drill and install, and that can get lodged at the drain valve, slowing the flow dramatically.
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Old 10-13-2018, 08:38 PM   #3
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Mine doesn’t “glue” but it is much slower than my previous BHBE on both the gray and the black. The gray is especially slower. Guess it has more turns.
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Old 10-13-2018, 10:20 PM   #4
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That is strange. We have a 2017 377 and ours donít do that. Try filling the black up completely and then do a drain. Get a clear elbow for both ends of the septic hose to see whatís happening. You can also get up on the roof and check to make sure the cap isnít obstructed. Otherwise, a trip to the dealer is in store.

Another test is to fill the bowl full up to he brim and flush. How fast does it drain? Is there a large bubble or several trying to cough back up at you? If so, you have a vent problem. Sometimes we hear of the plastic circle cutout falling back into the tank at the factory when they drill and install, and that can get lodged at the drain valve, slowing the flow dramatically.


Thanks. The bowl flushes fine and when the black tank is full it seems to come out good. But once it gets lower there is the suck of air , the ďglugĒ then good flow then it slows and repeats the cycle until itís empty. Iíll get up on the roof and check the vent stack.
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Old 10-14-2018, 07:37 AM   #5
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I had a problem Like that with a Montana fifth wheel. What I did was remove the vent cap take a tape measure and measure from the top of the roof to the bottom of the tank recorded that number, then slowly pulled up the tape until I contacted the bottom of the vent pipe that will give you the distance that’s in the tank. If the tank is for instance 8 inches and you only have 4 inches in the tank the vent went to far down and that’s the problem.
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Old 10-14-2018, 09:47 AM   #6
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One way to test the vent theory is to empty the black tank completely, get several 5 gal buckets, full 1Ē below brim, carry up the steps carefully, and count how much goes in til the drop tube starts to fill. Or with a garden hose and cutoff valve, fill one at a time in the bathroom. Keep tabs how it acts as you approach the 40 gal mark (8 buckets). You should have a 50 gal black tank.

As a side note, however, our shower grey is listed at 50 gallons, and Iíve measured 67 gallons on one experiment. Iíve pictures and video at the factory tour which shows both tanks looking equal size.

I carry 6 five gal buckets and lids with as our makeshift Ďblue caddy,í but ONLY for draining grey water! 30 gal of capacity and stores much easier (3 on each basement side) costs much less. $3/ea at WM. Lids are $1.50/ea. All for $30. If you can lift 43 lbs into the pickup bed, itís a viable alternative, and a good workout since we fulltimers donít ever hit the gym.
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Old 10-15-2018, 06:33 PM   #7
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If you are near full and it "glugs", but then stops "lugging" as the tank continues to drain, it's a sign that the vent has been pushed too far into the tank. Fill the tank with water, have someone step on the toilet flush (to let air in), and drain. If there is no "glug", then the vent is too deep in the tank.
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Old 10-15-2018, 07:46 PM   #8
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Snip...
have someone step on the toilet flush (to let air in), and drain. ...snip

Doh An excellent way to check vent restiction issues! Thank you!
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Old 10-15-2018, 08:32 PM   #9
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If you are near full and it "glugs", but then stops "lugging" as the tank continues to drain, it's a sign that the vent has been pushed too far into the tank. Fill the tank with water, have someone step on the toilet flush (to let air in), and drain. If there is no "glug", then the vent is too deep in the tank.


I think itís when it is lower. I have to check, but definitely want to check this. Thanks!
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Old 10-15-2018, 09:46 PM   #10
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I have the same problem with mine. Keep me posted, its annoyingly slow and I feel it slows down the sanicon system because that discharges faster than the black tank drains.
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