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Old 11-27-2012, 07:43 PM   #1
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12 volt pump

I have a 73' Ambassador, on a recent trip we were to far away to hook up to the water supply. I filled the holding tank with our water carrier, so we could have water for the toilet & sink (not to drink). (i bought a longer hose the next morning, LOL)

Anyway all i could get was vibration and noise out of the 12 volt pump, which i assume is original. Does it need to be primed or did I have a valve in the wrong position?

The control panel showed 1/4 tank & the pump would come on when i flipped the switch. Should i replace the pump or????
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Old 11-27-2012, 08:22 PM   #2
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You may need to prime the pump. It is a simple matter.
First; make sure you have water to the inlet of the pump.
Next; disconnect the discharge hose from the pump.
Then; turn on the pump to see if you get water out of the discharge. If so, turn the pump off.
Reconnect the discharge hose, open a cold water faucet and turn on the pump. If you get water, you are in business. If you choose to use hot water, keep in mind the water heater is either 6 or 10 gallons. If not full, it will take some time to get water out of the hot water faucet(s).
If you don't get water out the hot water side. There may be a 3 valve system to bypass the water heater for winterizing.
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Old 11-27-2012, 08:32 PM   #3
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Is there a "self priming" pump i can install?
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Old 11-27-2012, 10:31 PM   #4
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Shurflo and FloJet come to mind. There are others out there. Just type 12 volt RV water pump into the search engine.
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Old 11-28-2012, 12:12 AM   #5
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Also, if you have any leak in the intake side of the pump, you will not be able to draw water from your tank, which I believe in your '73 is below the floor. There is a rubber tube to the tank and they get to leaking under suction with age. There also is a strainer which must be in good condition. They are often damaged by freezing.

I would take the pump out and bench test if first, as well as replacing the intake hose and the strainer, if there is any question of their condition.

I had an intake hose which would not leak water out, but let so much air in under suction that the pump would not prime properly, nor pump right.
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