Originally Posted by Deltawinds
I have an older 35' Citation that is stationery at a seasonal Massachusetts campground. The trailer is connected to the campground water and strong, consistent pressure feeds two hose reels, one of which is on a splitter feeding the camper. Last year, no problems from April to October. This year, I am having inconsistent and varying water pressure at the kitchen sink, the bathroom sink and toilet from full pressure to a trickle at both ends. Overnight, or even sooner, I will have full pressure at both, but eventually the pressure drops off. Frankly, I'm stumped and have no idea what the problem might be. The water system pump from the fresh water storage tank does not work and hasn't since we bought this trailer on site.
First, should we assume the other side of the splitter still has full and constant pressure?
Disconnect the hose from the trailer. Is there full pressure/flow from the end?
If so, the most likely suspect is the check valve in the hose connector on the trailer. A sticking check valve will produce your exact symptoms.
A second likely suspect is a pressure regulator, if you have one plumbed into the hose or trailer. Same cause as check valve, especially if a cheap fixed pressure type.