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Old 12-17-2010, 03:09 PM   #15
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Easy solution if you have an outside faucet/shower. Just open the valve and it will drain down enough to break the syphon.
I don't understand how that would have any effect. The outside shower is plumbed after the pump, not on the tank side, so no water flows from it unless the pump is on or city water connected. And with the vent/overflow line obviously down to the 1/3 level in Supermike's tank, it wouldn't break the vacuum until the level dropped to 1/3 anyway. Can you explain further?
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Old 12-17-2010, 03:32 PM   #16
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I am gratful for all of your thoughts. We are off for a couple of weeks tomorrow and so will be unable to reply further, but your continued ideas would be appreciated. I will re-surface, after the 2nd Jan.

Thank you all, and a great Christmas and Peaceful New Year to you all.

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Old 12-18-2010, 07:22 AM   #17
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I don't understand how that would have any effect. The outside shower is plumbed after the pump, not on the tank side, so no water flows from it unless the pump is on or city water connected. And with the vent/overflow line obviously down to the 1/3 level in Supermike's tank, it wouldn't break the vacuum until the level dropped to 1/3 anyway. Can you explain further?
It was sometime ago, but I think I switched from tank fill to city and back again when it was y. Apparently there was enough drainage to break the volume. I'm fairly sure that my vent is at the top of the tank based on comments over at SafariFriends.

Maybe I just got lucky.
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Old 12-21-2010, 12:34 PM   #18
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I'll bet the problem is not a siphoning of the tank. Look and see if an air bubble is being compressed in the tank. The pressure captured may be pushing the water out. The overflow may not be the high point vent of the system. Does the overflow extend into the tank? It made have been engineered that way to relieve the pressure in the event of overfilling. Just my 2 cents.
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Old 12-21-2010, 01:18 PM   #19
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When it starts pouring out, let it run for about 30 seconds and then put your hand over the drain pipe and it will stop. My Essex does the same thing. The syphon tube IS recessed down into the tank
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Old 12-22-2010, 11:05 AM   #20
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. The syphon tube IS recessed down into the tank
Not on Winnebagos . I watched them mold the tanks and spin weld the overflow vent fitting on the top of the tank.
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Old 01-11-2011, 03:43 PM   #21
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Thanks to all that replied.

We ended back at the Dealers with this problem and the immediate answer was it can't syphon like that because the overflow is spun wealded to the tank, there is no pipe inside.

My responce was "well you try it and see"

So the rig was put in over the pit and the hose connected, the tank filled until it ran out of the overflow and the hose disconnected. 20 minutes later and it is still running out of the overflow and a small flood is beginning in the pit. So the mechanic goes underneath and pronounces that the tank is still full. Rubbish says I, standing on a very wet floor. At that point there was a huge intake of air (like a big fart) and the flowing water stops and there is now only a third of a tank full.

So again the hose was attached and the tank filled up until it started out of the overflow. Here we go again, except this time the mechanic, skinny guy, had disappeared amoungst the tank and all the rest of the stuff around there. He shortly reappears to say that the top of this very wide, but not very deep tank was collapsing as the water went out. So who would have thought that any syphon once begun would be strong enough to do that.

Anyway the elbow where the overflow pipe exits the tank was replaced with a tee piece and a vacumn breaker fitted to the additional leg, which allows air into the top of the tank. It seems to have fixed it, as several fills afterwards were ok.

So there mystery solved.
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Old 01-12-2011, 06:29 AM   #22
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I had the same problem when I filled up the tank prior to a dry camping trip in my 99 Adventurer. My solution was to go to the hardware store and purchase pvc shutoff for 1/2 pvc pipe, it slips right on to the end of the overflow pipe, you can apply glue if you like, after filling tank I shut the vale off while I travel, once I get to my destination I open it up, solved the problem on my 99 and did the same thing on my current 2004 Adventurer
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