Water pressure problem

[machman72]

I just started experiencing a water pressure problem with the rig. The problem seems to be too much pressure. I have noticed a couple of times now that when traveling, and using the water pump, I have actually seen it blow the rubber cover out of the city water hook up, and squirt water out the side. This weekend we were connected to the campsite water system. All the connections have those screw on backflow preventors. My rig was the only one in the whole site area that was blowing water out of the backflow preventor. Did it all weekend. My hoses are new, and the washers are also. Had everything connected good and tight, so I know it wasn't just leaking. Could actually hear air escaping from the backflow, before every "water squirt". Any Ideas? I checked my fresh water tank. I only carry enough water in it for toilet use while traveling, and it appeared fine. The water tank fill bypass is closed as it is supposed to be, except when filling it up. There's no pressurized air in the tank, since it has an overflow relif on it. Real strange.

[machman72]

I just started experiencing a water pressure problem with the rig. The problem seems to be too much pressure. I have noticed a couple of times now that when traveling, and using the water pump, I have actually seen it blow the rubber cover out of the city water hook up, and squirt water out the side. This weekend we were connected to the campsite water system. All the connections have those screw on backflow preventors. My rig was the only one in the whole site area that was blowing water out of the backflow preventor. Did it all weekend. My hoses are new, and the washers are also. Had everything connected good and tight, so I know it wasn't just leaking. Could actually hear air escaping from the backflow, before every "water squirt". Any Ideas? I checked my fresh water tank. I only carry enough water in it for toilet use while traveling, and it appeared fine. The water tank fill bypass is closed as it is supposed to be, except when filling it up. There's no pressurized air in the tank, since it has an overflow relif on it. Real strange.

[AFChap]

My guess is that you have a bad backflow preventer IN THE COACH end of the hookup. I've had the backflow preventer in my city water hookup leak sometimes when it gets something in it (sand, crud, etc). Sometimes, pushing the plunger to allow it to flow more, then releasing it, will help unless it is shot inside. When you have the water pump on, or city water connected and turned on, the system is pressurized, and if there is a weak point water will escape. And if there is any air in the line, it will escape also if the escape point is higher up in the system.

[Gary RVRoamer]

There is a check valve in the city water inlet that prevents back pressure pushing water out the inlet. Yours is either damaged or, more likely, just has some sand in it. Bleed the pressure off in the RV system and then look into the city inlet for dirt. You may have to remove a wire screen to do so. Maybe poke a bit at the check valve with a piece of stiff wire - that sometimes will let the dirt fall out. If that doesn't do it, replace the inlet - they aren't expensive and there are only a few types.

[paz]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by RV Roamer:
Bleed the pressure off in the RV system and then look into the city inlet for dirt. You may have to remove a wire screen to do so. Maybe poke a bit at the check valve with a piece of stiff wire - that sometimes will let the dirt fall out. </div></BLOCKQUOTE>
Make sure you open a faucet inside the coach to bleed off the pressure as RV Roamer says BEFORE poking around the check valve. Otherwise, you could get wet and you could damage the check valve. Don't ask me how I know.