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Old 03-29-2016, 10:13 PM   #1
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90 Chieftain. Water fill issue

I have a 1990 Winnebago Chieftain. Bought it about two months ago. She's just about all ready to go, so I figured I would try my hand at filling up and testing the plumbing system.
Well, it seems this model/year (and Itasca) have somewhat of a unique water fill system. There is only one inlet with a transfer valve from water tank fill or city water.
I attached a hose, transferred the valve to water fill & let her rip. The hot water tank filled and faucets had water with good pressure. That's as far as it went. Lost pressure in faucets and it didn't matter what side the valve was on, no water was flowing into the tank or coming from faucets.
There is also a drain valve next to the inlet that is completely missing.
Also, on the top side of the water tank there is a threaded elbow with nothing connected. I can't tell if it is related or if that is the overflow that is disconnected. I can only find one site with plumbing diagrams and the link that I need is coming up blank.
Any help is greatly appreciated. Thank you.

I'm going to try and upload a short video of the compartment in question.
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Old 03-30-2016, 10:26 AM   #2
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I'm surprised a plumbing diagram for a Winnebago isn't available, but I'm not sure it would help you because that looks like a DIY modification to me. Having a single city water fill point and a selector valve to choose tank fill or city water isn't uncommon. The only time it can cause an issue is if the valve isn't closed completely and you overfill the water tank, perhaps causing structural damage as it expands. (The overfill usually gets overwhelmed by the fill pressure.

You could restore the system to the original, or add a separate tank fill attachment either in the wet bay or on the RV side. There are many styles and types of fill attachments available. My RV has a plastic locking door that allows city water connection or tank fill in a separate access hole to the tank. No valve to set or fail, it just works.

The missing drain could be what the 'T' fitting with the cap on the end modification replaces. Not sure about the copper tube with the flare end, can't see where it's coming from.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 03-31-2016, 09:08 AM   #3
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Thank you for your insight.
I think I'm going to try connecting the free standing flared pipe to the cap on the T.
I believe they might be related.
I think the missing drain is a separate issue in itself.
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