Fresh h2o tank sucking air

[boyscout]

I wonder if Tim2542 found a solution after he started this last fall?

Also Cate&Rob in the tank and plumbing photo you posted in Msg #3 there are three wires connected to level sensors to the right of the overflow. What is the wire and sensor to the left of the water outlet, lowest level? Why over there rather than with the others? Thx.

[Cate&Rob]

boyscout
Hi Mark,

That pattern of probe locations is also common with the level sensors in grey and black tanks. I don’t know the reason, but I suspect the separate and lowest probe is the circuit ground.

Rob

[MikeM]

I had the same issue when sanitizing the system on my new 2019 28MKS. Water pump kept running after faucet was turned off. Found that the fresh water tank line connection to the water pump had not been completed. The PEX band was in place where the line meets the water pump but it was not crimped. Thus there was a small leak and air getting in when the pump was running.

[howson]

I had the same issue when sanitizing the system on my new 2019 28MKS. Water pump kept running after faucet was turned off. Found that the fresh water tank line connection to the water pump had not been completed. The PEX band was in place where the line meets the water pump but it was not crimped. Thus there was a small leak and air getting in when the pump was running.

I noted this is your first post, MikeM, so welcome to Grand Design's Technical Forum and thank you for sharing your experience. That kind of information is very helpful in building our "knowledge base".

Howard

[Yoda]

My fresh tank has begun to suck air when only 1/2 empty or so, a new development. Any tips on where to look before I tear into it? I suspect Im going to have to open the bottom and find the tube going into the tank. This on a 310 Solitude Thanks

Mark - one thing to check as mentioned above. The filter assembly in front of the pump. Make sure the clear bulb portion is facing up. I don't know why but there was a post I read somewhere recently where turning the bulb up solve the air problem for them. The post may have been at the other place.

Hope this helps
Keith

[TucsonJim]

I had the same issue when sanitizing the system on my new 2019 28MKS. Water pump kept running after faucet was turned off. Found that the fresh water tank line connection to the water pump had not been completed. The PEX band was in place where the line meets the water pump but it was not crimped. Thus there was a small leak and air getting in when the pump was running.

Nothing better than a "new guy" joining in with a proposed solution in their very first post. Awesome. Welcome to the forum Mike!

Jim

[Kevin Kings]

Hello all, and thank you for your posts! I am the new kid on the block, have a GD 2019 Reflection150 273MK for a few months, and have been pulling out my hair over this same issue. I get a few short showers, some flushes, and a small bit of sink use, and my system starts sucking air. The coughing and sputtering water/air mix becomes more air if run very long. I was planning the bucket measure test for remaining water volume, and to go behind the Nautilus system to check all connections. I did that a while back, and had to buy a crimper tool and replace and re-crimp 21 of the weeping crimps on the hose/valve junctions. I will post the results after a complete inspection. Thanks for the numerous thoughts and ideas.

[Floyd&Tamily]

Just wanted to provide an update on my issue.....and no I haven't resolved it! lol. Anyway, used a borescope to inspect the connection at the tank and got some pictures inside the tank. Still trying to get a picture of where the tank outlet connection is on the inside. Anyway, one of my theories is that I have a restricted line to the pump where the issue is overcome with more than thirty gallons of water because there is essentially more "head" pressure with more water. The plastic shavings you see make me concerned that there could indeed be a restriction especially since there is a 90 degree fitting right out of the tank. I also found a few plastic shaving pieces at the pump. I'm unsure of how these shaving are still in the corner of the tank as I have flushed these tanks numerous times. I am eventually going to try and flush the supply line in reverse from the pump to the tank. More to follow........

[howson]

Just wanted to provide an update on my issue.....and no I haven't resolved it! lol. Anyway, used a borescope to inspect the connection at the tank and got some pictures inside the tank. Still trying to get a picture of where the tank outlet connection is on the inside. Anyway, one of my theories is that I have a restricted line to the pump where the issue is overcome with more than thirty gallons of water because there is essentially more "head" pressure with more water. The plastic shavings you see make me concerned that there could indeed be a restriction especially since there is a 90 degree fitting right out of the tank. I also found a few plastic shaving pieces at the pump. I'm unsure of how these shaving are still in the corner of the tank as I have flushed these tanks numerous times. I am eventually going to try and flush the supply line in reverse from the pump to the tank. More to follow........

Thanks for the update. When you find the culprit (and fix the problem) I suspect it will be something we'll share with a lot of individuals in the future.

[Cate&Rob]

I am eventually going to try and flush the supply line in reverse from the pump to the tank. More to follow........

Floyd&Tamily

Thanks for the follow-up on this. I have linked you into another related discussion, for your input there.
"Flushing the supply line" is essentially pressure filling the tank since this uses the same line that feed the water pump when using tank water.

Rob

[Floyd&Tamily]

Floyd&Tamily

Thanks for the follow-up on this. I have linked you into another related discussion, for your input there.
"Flushing the supply line" is essentially pressure filling the tank since this uses the same line that feed the water pump when using tank water.

Rob

Cate&Rob

Thanks for that nugget of info. That being said it may steer me in another direction/theory.........more to follow! By the way I did get a picture of the pick up inside the tank. It is right next to the dump valve. Doesn't appear to be restricted from what I can see anyway. I'll leave the proctologist comments for others to make! LOL