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Locate the water heater and access the cargo door near it. Inside the cargo door, most likely behind an access panel, you should see the water pump. The water pump need to be near the hot water heater to get the most pressure.
One way to locate the water pump is to turn on a facet and then turn on the water pump. You should be able to hear it run as it tries to "catch up" on water flow/pressure. Look where the sound comes from. You can find the water heater from outside the RV by looking at the walls for a access door that has a screen on a portion of it. This will be the location of either the water pump or the furnace. If furnace, look for another such door.
If the trailer has a fresh water holding tank it will have a pump. The older units have a hand pump located next to the sink. There should be a switch located inside the camper, typically on the monitor panel. When you turn that switch on and open the faucet you should hear a vibration noise. If the switch does not illuminate that could be that the circuit is dead and the fuses will need to be checked. The pump is usually located near the sink behind an access panel that will be screwed shut.
They usually locate them close to the kitchen or bathroom sinks. Often times they will be hidden behind a concealment panel in the storage space under the bathroom. You will have to possibly remove your items in storage behind the kingpin. On the drivers side of the unit inside the storage space there should be a carpeted panel that will have four screws holding it in place. Remove that panel and behind the "docking station" where all of the fresh water supply connects you should find the fresh water pump.
No diagrams available. There should be a tank located under the trailer with a water fill point on the outside of the trailer. Inside under a cabinet there should be a demand pump with an on/off switch located on the monitor panel. There may be a winterizing three way valve between the tank and the pump with a third open ended line used to draw antifreeze into the system. If the valve is in the wrong position the pump will not prime and distribute the water as designed. From there the pump is plumbed into the rest of the plumbing system.