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psalm10720's avatar
psalm10720
Explorer
Jun 04, 2017

Water mystery on pump mode

I had my city water receptacle changed a few years ago and it solved a problem at the time. Now a new problem has just immerged..

The water system is working fine when using city water.

When I put the cap on the city water receptacle and turn on the pump the cap pops off and water pumps out of that receptacle. If I turn on faucets within the coach then go out and press on the cap a small weak amount of water comes out of the faucet but not strong at all.

Logically it seems as though something is blocked within the RV plumbing. I thought at first the pump wasn't working but when I went outside and observed that water was being pumped out of the city water receptacle I knew I didn't know the answer...

Any help is greatly appreciated...

1993 Winnebago Brave 27RC
Class A
  • georgelesley's avatar
    georgelesley
    Explorer
    Jun 04, 2017
    Once while camping we had the same thing happen. Late at nite with no other ideas, I took the air fitting I use for blowing the lines to winterize the system and screwed it in the fitting, that stopped the problem until I could put in a new fresh water fitting.
  • Dutch_12078's avatar
    Dutch_12078
    Explorer II
    Jun 04, 2017
    The city water fitting is equipped with a check valve that's purpose is to stop the back flow from the pump when the city water supply is not connected. Your check valve has failed in some way. Fixing it may be as easy as easy as removing the filter screen if it has one, and pushing in on the check valve and letting it re-seat itself. If that fails, the small rubber O-ring that forms the seat may have been displaced. If you can see it and get it back in place, you'll be all set. Otherwise, you may need a new fitting. A quick interim fix is to replace your existing push on cap with a screw in plug from a yard & garden shop. An inline garden hose shutoff valve also works well.

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