Lynnmor wrote:
Follow the line from the city water port to the first fixture, there must be a restriction. If you were to remove the cold water line to the water heater and back flush from there with the city water port check valve removed, maybe you could dislodge debris or at least check the flow. Another method would be to connect a garden hose to the cold water low point drain instead of at the water heater.
X2
When hooked up to city water, do you have "good" pressure, and then it quickly falls off to a trickle when you turn on a tap? If so, you must have a kink or some debris somewhere between between the source tap and the water heater. Have you checked the supply hose itself?
Remove the screen at the trailer inlet then backflush as Lynnmor suggests. There is a sink tap to garden hose adaptor made for backlash situations. Take the aerator off the tap, and screw the adaptor on in it's place. Hook the garden hose up and flush.
Maybe check your local hardware store for one. You may also need a female (edited) by female (edited) hose adaptor for the source end.
Could be that there is a kink in the pex line if the supply hose is good. Good luck locating it if it is not obvious.
As an aside, 80 PSI could be a bit much for your RV. I prefer something around 40-50. Not sure, but I believe that RV water systems are rated at something like 60PSI. Something for you to check out.
Hope this helps.
