Bad city connection check valve cause low water pressure?

ItsyRV wrote:
If the city water inlet is connected to a flexible hose/tube inside, it's a remote possibility the hose/tube somehow got kinked and is restricting flow.

Good point - that happened to mine. The city water inlet is the second from bottom white hose on the right in the photo I posted above. A short length of pex then flexible hose. I had to loosen the connections and twist the hose to get the kink out. You can see that it's still a bit restricted but not bad enough to worry about.

I plan to take it apart Saturday when I get back to camper. Should I use butyl tape to seal it back on camper.

If the city water inlet is connected to a flexible hose/tube inside, it's a remote possibility the hose/tube somehow got kinked and is restricting flow.

YES.......
A bad check valve in City Water Inlet WILL cause low flow issues

Check valve is a plunger/spring/O-ring assembly \IF o-ring gets dislodged is can Block water flow to plumbing lines

You have courage to hook to city water without a pressure regulator. Russian roulette!

A city water has a threaded "swivel" fitting on the interior side. Often inside a cabinet or behind a bank of drawers. You could get access to the interior side of the inlet and punch out the check valve. They're just cheapo plastic gizmos. I removed ours and replaced it with a commercial grade brass one. Perhaps that would help you?

AFAIK, check valves inside city water inlets are an integral part and you'd need to replace the inlet. That would require caulking it. I'd opt for a separate new one inside.

Is the filter screen still in the city water inlet? They can sometimes plug up with silt & debris. Same thing can happen to the check valve.

A regulator is always a good idea. CG water pressure can get very high and I've heard of it getting as high as 200 psi. We've seen as high as 140 psi. If you travel around much, you won't know what kind of pressure you'll have. Also, sometimes pressure can be at an acceptable level but there can be a surge that could possibly cause damage.

I know this is a pretty pathetic diagram, but it represents exactly what's in the photo I posted above. If your rig is like mine, the check valve is the only thing between city water and rig plumbing.

It's probably a defective check valve. The valve may have come out of the the mount, missing retainer clip. That's why it appeared crooked,out of place. With the pressure from the city water, it's pushing the valve piece too far and obstructing water flow. It probably doesn't stop the water from leaking out when using the pressure pump either.
Relativity cheap and easy to replace..

Ken

In any case, RV plumbing is always easy to figure out. This is my Voltage 3950.

joebedford wrote:
Was the water pressure still low when you checked your pump after the problem with city water?

I actually put some water in the tank and used the pump for better pressure. The pump worked great and easily built up pressure.