How do I Replace a 12V Water Pump in an RV?

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    • 1). Turn off the power source to the water pump. If the RV uses circuit breakers, turn off the circuit breaker labeled water pump. If not, disconnect the negative battery terminal with an adjustable wrench.

    • 2). Turn the RV's water-supply valve's handle counterclockwise by hand. This valve is located where the hose connects to the RV's water intake.

    • 3). Follow the pipe that leads from the water storage tank to the water pump. Wrap a piece of tape around the hose that enters the pump from the storage tank. The arrow on the pump should point away from the hose with the tape. Verify this before continuing.

    • 4). Wrap a piece of tape around the wire that connects to the red-colored pump wire or the positive terminal, which has a "+" marking. The pump wires use red and black colored insulation. The red wire connects to a wire that leads to the battery's positive terminal, and the black wire connects to a wire that leads to the battery's negative terminal.

    • 5). Disconnect the wires that lead to the water pump. If the wires that come from the water pump connect to the wires that lead to the battery with wire nuts, loosen the wire nuts by hand. If the wires connect to the water pump with terminal screws, loosen the terminal screws with a flathead screwdriver.

    • 6). Loosen the hose clamps that hold both hoses to the water pump with a flathead screwdriver.

    • 7). Pull each hose from the pump. If a hose sticks, grab the hose and twist while pulling it off.

    • 8). Remove the water pump's mounting bolts with an adjustable wrench. Most pumps have three or four mounting bolts.

    • 9). Pull the pump from the RV. Place the new pump in its place. Verify the water pump's arrow points away from the hose with the tape on it.

    • 10

      Secure the pump to the RV with the mounting bolts. Tighten the bolts with the adjustable wrench.

    • 11

      Push the hoses onto their respective hose connections. Slide each hose clamp into place and tighten with a flathead screwdriver.

    • 12

      Connect the wire with tape on it to either the pump's red wire or its positive terminal. Connect the other wire to the pump's black wire or the negative terminal. If the pump uses wire connections, twist new wire nuts onto each wire connection. If the pump uses screws to hold the wires to wire terminals, tighten the terminal screw with a flathead screwdriver.

    • 13

      Turn on the water to the RV. Connect the power source to the water pump. Test the pump and check for leaks. Tighten any leaking hose clamps with a flathead screwdriver.

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