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Old 12-19-2014, 01:35 PM   #1
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check valve in water pump system

My DW said "fill the fresh water tank" did I do it NO. Then the camp groung water system went off just as I NEEDED a shower. When the water came back on I filled the fresh water tank, shut off the park water and ran the pump for about 10 minutes. Satisfied that all the air was out of the system and working properly I turned off the pump and turned on the campground system. About 5 minutes later I've got Niagara falls out of my vent and fresh water fill connection. I shut off the campground supply and pumped the fresh water down to 2/3 and tirned on the main supply. Same results. I figure there is a check valve somewhere near the pump but can't identify it! It has to be stuck open. My unit is a 2014 Puma 38 PLF. It worked fine last April when we went home for the "summer" now this. Does anyone know where the check valve is located? In the interm I have isolated the pump.
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Old 12-19-2014, 01:42 PM   #2
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Most RV pumps have a (Internal) valve! Youroo!!
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Old 12-19-2014, 01:56 PM   #3
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Turn your pump on, let it run for a bit to pressurize the system then turn it off. Bleed some pressure by opening a faucet. Repeat several times - all with the city supply off. Then turn the city supply back on. This usually reseats the valve and allows normal water operation.
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Old 12-19-2014, 02:18 PM   #4
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Thanks Big TJohn I'll give it another try. I did that twice yesterday but I will try it again.
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Old 12-20-2014, 07:02 AM   #5
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Youroo I think you are probably right. I am going to contact the dealer and see what they say. The unit is about 11 months old so it should be covered by Forest River anyway. I just thought if was an easy inexpensive fix I'd do it myself.
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Old 12-20-2014, 01:13 PM   #6
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Oldprof1, we are dealing with the exact same situation. The check valve that prevents the backflow into the fresh water tank is built into the pump. If it is like the pump was on our boat (and I think it is) the check valve is actually a diaphragm.

BigTJohn, we tried "cycling" the pump a lot, but the valve will not re-seat itself. Solution: Replace the pump. $109 at Camping World, but the same pump was $60 on Amazon.com with free shipping and no sales tax.

I have the pump, but our trailer is put away right now, so there is no big hurry to change my pump. Once I do, though, I'll take the old one apart and see what the diaphragm looks like. May be possible to re-seat it manually and keep the pump for a spare.

Good luck with yours!
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Old 12-20-2014, 04:44 PM   #7
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check valve

my water pump had a hair line crack internally and did the same thing bypassed the check valve, bad part was it filled the fresh water tank which had a leak and I was told to stop the leak or leave the camp ground.
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Old 12-20-2014, 04:57 PM   #8
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There may be so type of dirt or calcium sticking the check valve open. Take you pump off and take it apart and look for some foreign material in there. Put back together and it should/may work fine.
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Old 12-20-2014, 05:43 PM   #9
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Most of the higher end RV water pumps can be rebuilt fairly easily, Search online for a rebuild kit for your model, It consists of diaphragm, valve and seals. Simple task.
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Old 12-20-2014, 05:49 PM   #10
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or might be cheaper, faster and easier to add check valve to output line of water pump??

SharkBite 1/2 in. Brass Push-to-Connect Check Valve-U2008-0000LFA - The Home Depot
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