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02-24-2022, 05:48 PM #11
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2021 Momentum 31G
2021 20' Haulmark Edge race trailer
'17 Ram CCLB 3500 dually 6.7 turbo
'96 Chevy C3500 CC dually 454
2019 Honda Talon X
1985 Honda FL350R Odyssey
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02-25-2022, 04:54 AM #12
I have had the underbelly off of my 398.
What I believe is the root cause is the haphazard way the tanks are installed. They are all at different heights. This will cause what you have experienced.I think that it will not do any good to shut off your valves in order to get a complete fill. because when you open them at camp that water will just leak out. The solution is to raise the height of the vents, as I touched on in my previous post. Install a "T" to each overflow. Install your valves to it, and a length of PEX to the remaining "T". Route the PEX to a higher spot on the coach. I installed mine high up in the propane compartment.
This eliminates having to remember to open the valves in camp, as they are always vented threu the new PEX, and permits a full fill as the vent is much higher than the tank... I also put some screen over the new vent to prevent things from getting into it.... Which IMO is another problem with the stock tank vent setup.... It is easy for insects etc. to find their way into the tanks
NOTE: I tied the vents together so I only had to run one vent into the propane compartment. This is fine for general use when camping using the water pump. But IMO, it is probably necessary to open the shutoff valves in order to use the tanks dump valves. I think those two, 2" valves with only one vent would not be sufficent. Opening the shutoff valves returns the venting to the stock configuration.Last edited by huntindog; 02-26-2022 at 03:40 AM.
2021 398M Full Body Paint 8k axles. LRH tires. Disc brakes.
Two bathrooms, no waiting 155 fresh, 104 black, 104 grey 1860 watts solar.
800AH BattleBorn Batteries No campgrounds 100% boondocking
2020 Silverado High Country 3500 dually crewcab Duramax Allison
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03-02-2022, 07:20 PM #13
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- Apr 2020
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- Central Wisconsin
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I have a much smaller 17 MKE with just one take, and I cork the overflow because I too noticed I didn't have the water I thought I had. I just make a checklist and uncork it at camp.
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03-04-2022, 06:29 AM #14
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- Nov 2019
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- S. E. PENNSYLVANIA
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You're setup should now work fine. I only have a single tank in my 337RLS 5er and was having the same issue... losing water while traveling. I tried the remedy of installing a PEX T fitting and running the vent pipe to the front of the RV and up into the propane compartment... It didn't work. The problem was that running PEX from the tank overflow located behind the rear axle all the way to the front of the RV then up about 2' caused what was essentially a very long pipe trap. I had extremely low water flow because the pump struggled to pull air past that water trap. I ended up repiping everything and just installing the ball valve on the tanks overflow line. Remembering to open the valve isn't hard... especially with a reminder tag on the Nautilus valve. While I was doing this modification I decided to relocate the overflow valve and the 1½" FW dump valve out from behind the rear wheel by mounting an aluminum angle to the rear stabilizer jack and attaching everything there.
It's much easier on the old back to access these valves... they've worked flawlessly since installed.
Last edited by IBEW Sparky; 03-04-2022 at 06:35 AM.
Bill & Colleen ~ Schwenksville, Pa
2019 Reflection 337RLS
2006 GMC Sierra 3500 8.1L V-8
Firestone Ride-Rite Air Bags
Front Stabilizer Bar
Rear Anti Sway Bar
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05-29-2023, 08:46 PM #15
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Hi Terry, quick question for you on this. When I fill up my tanks, the rear tank is the first one that starts to leak it is closest to the axles, and IÂ’ve noticed that when I fill up the water tank and itÂ’s level, listen back one towards the axles starts to leak first. I will then raise up the driver side and continue to fill slowly and then eventually the front take closest to the truck starts to leak. I just want to make sure that the rear tank which is closest to the axles is the main one that fills up and then it spills off into the second tank which is located at the front. I hope that makes sense, sir.
Thank you, and I hope you had a nice memorial day weekend
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05-30-2023, 04:48 AM #16
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Sorry, I don't know what the configuration is of where the fresh water is pulled from the tanks. I'm assuming it's being pulled from both tanks at the same time. Perhaps someone will chime in that knows for sure. When you are filling, both tanks are filling at the same time but rear fills completely before the front on mine as well. I just close the ball valve on the rear overflow when it starts to pour out and the front will take a bit more water before it starts to overflow.
2021 Momentum 31G
2021 20' Haulmark Edge race trailer
'17 Ram CCLB 3500 dually 6.7 turbo
'96 Chevy C3500 CC dually 454
2019 Honda Talon X
1985 Honda FL350R Odyssey
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05-30-2023, 12:32 PM #17
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06-28-2023, 08:57 AM #18
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I have a 2022 21g with dual tanks .It has 2 vent lines per tank .Do people still have proplems with this new set up ?
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12-20-2023, 07:12 PM #19
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Pls help. My 2018 Granddesign imagine is parked on my yard for the past 12 months. I hooked up the city water to the RV and leave it on all these time. Water keeps running out of the overflow valve often every hour. Am I not supposed to hook up water and leave it on like that? Pls help. Thanh you
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12-20-2023, 07:17 PM #20
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My water bill is skyrocketing. Pls help anyone. I am desperate. Merry Christmas everybody
Morryde Safe-T-rail install issues
Today, 12:55 AM in Mods and DIY