Wednesday, November 30, 2022


RV “city water” connection yields no pressure


By Chris Dougherty

Chris Dougherty is a certified RV technician. Here is a letter he received from a reader while he was serving as’s technical editor.

Dear Chris,
drip faucetI have a new-to-us 2003 National Sea Breeze LX, with an issue with water pressure.

The coach seems to have great water pressure and flow when we are pumping from the on-board storage tank, but when we are connected to the city water line, both the volume and pressure seem low. I’ve checked the water flow at the source, and it just rushes out of the hose. Other RVers in the park all say they don’t have a problem.

I’m guessing it is either a bad pressure regulator or a restricted water filter. I’ve dismissed the filter idea as I assume the water from the storage tank would also flow through it, and that source seems fine. The information we got with the coach says there are two filters in it. One for the ice maker and the other for the rest of the system. So far I can only find the ice maker filter, and I’m wondering if the information is a misprint, as it seems redundant to filter the water and then re-filter it for the ice cubes. —Jerry

Dear Jerry,
The problem you are referring to is somewhat common, and here are a few things to consider when there is a flow restriction in the incoming water connection.

First, make sure the flow is good through the hose itself, to verify that the inner lining of the hose hasn’t separated and blocked the flow. Second, most city water connections have a filter/washer installed where the hose connects. Remove this filter/washer and check its condition. If it’s plugged up (which they frequently are) clean it or just replace it. On occasion, the one-way valve in the city water inlet on some RVs breaks, and the pieces can block the water flow. I’m not sure which connection you have in your coach, but it will have some sort of check valve, and that could be plugged or faulty.

Third is the filter for the incoming city water. There are numerous types of filters on the market, and having two filters in the system is not unusual. The primary filter for incoming water is most likely just a particulate filter, but other filter elements that are finer could have been installed. The ice maker filter is a much finer filter for removing impurities from your drinking water. If you have never changed the filter element, now would be a good time to make certain they’re OK.

While I’m not certain about your particular coach from here, some RVs were equipped with a water control system, Coachmen among them. There were a number of valves which controlled how water was distributed throughout the system, winterizing settings, water tank filling, and in some cases, water system drains. Make sure all your valves are in the correct setting.


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2 years ago

I have the same problem as Jerry. Installed new inlet check valve still almost no water pressure. this started after I had a leak at the inlet water hose, made a new connection on the water hose. after that the pressure stored in hose was used the pressure was and is almost nothing. I really need help

2 years ago
Reply to  kathleen

Same here . Came home to higher pressure and made no difference.
When I left home connection it was great pressure to sink

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