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When hook up city water to rv it shoots out vent

Can not get water to stop coming out of vent so it is pouring out

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It is likely one of two things, either your RV has a waterline to your fresh water tank that allows you to fill that tank when you are hooked to City water, or the check valve on your water pump is bad and it is allowing city water to fill your fresh water tank. Make sure your freshwater tank is empty, have someone turn the city water on while you watch the freshwater tank... you should be able to see where it is filling from....if it is filling from the water line that run to the water pump, the check valve is bad, if it is filling from a city water fill line, locate the valve on that line and close it. If it is indeed the water pump check valve...you can either replace the pump, or add a cheap inline check valve, like a sharkbite check valve.. they run like 12 to 15 dollars.. install in seconds....you just cut the pex pipe then shove the ends into each end of the check valve.

Posted on Mar 21, 2014

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Posted on Jan 02, 2017

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2 Answers

Where is the water pump on a laredo 274rb located? Its getting cold and time to winterize.


Is 1 gallon such a waste of money or replacing all lines busting from freezing .

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How do I winterize. My 5th wheel does not have the hose to pump antifreeze like my old camper did


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Why is fresh water tank filling up when hooked up to city water?


Many RVs have the plumbing to fill the fresh water tank from the city water hook up. This valve is usually near the city water hook up and labeling is similar to "city water" and "tank fill". Another anomaly from leaving the valve in the "tank fill" position is that, when not connected to city water, the on board pump may run continuously and the water volume is very low.

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1 Answer

Freshwater tank fills and overflows even though selector is pointed at 'city water' position.


Other than a leaking 4 way selector valve the probable cause would be a leaking check valve in the pump.

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Where can I find the plumbing schematic for a 2008 Keystone Springdale 291.


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When connecting the water to the city water connection it filled my fresh water tank. Is that normal?


Probable cause would be a leaking check valve in the pump.

On the RV the city water and discharge from the fresh water pump are tied together. When on city water the discharge of the pump will have city water pressure on it. If the internal check valve on the pump is leaking, water will flow through the pump backwards and into your fresh water tank.

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I HAVE A 2014 THOR PALLAZZO 33.2. I JUST HOOKED UP TO CITY WATER BUT CANNOT GET ANY WATER INTO RV


Double check you are hooked up to city valve, just in case they have a tank flush valve that looks similar. If you are, remove hose and screen in city valve and push plunger end in and see if it's free. You should be able to push in small end of valve in center. Perhaps check valve is jambed.

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1 Answer

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Make sure you have enough water in the tank or city water hooked up. A pump will run and suck air if the level is low. it could force water to the sink, etc, but not the shower.

Are your valves for the water pump set correctly? Remote possibility someone installed a shut-off valve between the pump and shower.

Could be the pump is getting weak/leaking internally and can't build enough pressure.

Make sure the shower head is not clogged. Remove it from the hose and try again.

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Remove the screen/washer at the city valve and you see a small stem in center of valve, that's the plunger (check valve ) . Use a pair of needle-nose pliers if necessary to push it in ( it should have spring behind it) slightly and make sure it is centered in the hole, then just pull on it slightly to seat it. Now try pump. If it won't seat properly and water still shoots out, it's probably defective and needs changing. Perhaps whoever winterized it forgot to push that in after pumping antifreeze through system, which results in water trapped in valve, thus freezes and breaks apart inside. If your stuck, screw a plug the right size into the city water fitting. Short piece of old garden hose with male end & plug (old bolt or anything proper diameter) and small hose clamp in other end will work for temporary use even.

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