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Author Topic: Air test for H2O  (Read 442 times)


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Air test for H2O
« on: February 03, 2018, 12:55:57 PM »
Can I safely test my fresh water system with regulated air?  I drained but didn't blow out the lines and it got very cold here. :-[  I'm kinda worried about the 12 volt H2O pump. :(

Gary RV_Wizard

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Re: Air test for H2O
« Reply #1 on: February 03, 2018, 02:24:36 PM »
Yes. I would use 25-30 psi.

However, that will only test the internal check valve in the pump, the one that prevents water from flowing back through the pump to the tank. You can't use air to verify that the pump can pump (suck water from the tank).  You cannot pressurize the fresh tank with air - the tank is vented.
Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL


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Re: Air test for H2O
« Reply #2 on: February 03, 2018, 02:52:28 PM »
Ga Boy, If I understand your concerns.... you are worried about the pump freezing after “air” wintering your system! I too, blow out my system, but follow-up through the pump with the RV antifreeze. Making sure your water heater is “bypassed”, then pull from your antifreeze bottle with your pump “winterization” line. This will flush your 12 volt water pump with antifreeze.....winterizing your pump!
Todd and Marianne
Home Base: Winchester, Wy.
Miniature Schnauzers - Sundai, Nellie and Maggie Mae
2007 Dodge Ram 3500,  6.7 Ram 6 speed manual, 4x4
2004 Teton Grand Freedom
2007 Bigfoot Class C


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Re: Air test for H2O
« Reply #3 on: February 03, 2018, 07:32:56 PM »
Thanks for the replies.  I will wait for warmer weather and do the test (Air and visual and then water)