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Old 07-01-2014, 04:59 PM   #1
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Air in water system

Our class C motorhome water bangs loudly but only when using pump. Does not happen on city water. How can we fix it?

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Old 07-01-2014, 05:13 PM   #2
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Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 11,950
Do you have any indication of air in the system when turning on the taps?
If so you need to check the inlet debris filter on the pump; clear plastic 2" round , screws off the pump by hand, and look for cracks. If cracked , replacement is in order. $10 or so.
If your not getting air out of the taps then you have to check the plumbing attached to the pump, if the pressure side is ridged plastic, you will need to install about a foot of drinking water suitable flex hose to isolate the pump, from the rest of the plumbing, and check all the runs of water lines for loose mounts.
Fittings and hose at any RV store.

99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 07-01-2014, 09:47 PM   #3
"Formerly Diplomat Don"
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Location: Moorpark, Ca.
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Typically there are several things you can do to repair this.

First....make sure your pump is soft mounted. Often, placing a mouse pad under it and screwing it back down will help.

Second....The banging is caused by surges in the pump and the plastic water line is moving and hitting a wall. You need to hunt down where the banging is coming from and secure the plastic water line better.

Lastly......Many RV manufacturers use the hard plastic PEX tubing for the water lines. They often plumb it directly to the water pump. This causes a lot of water pump noise to be transmitted to the interior. If the PEX water lines are plumbed directly to the pump, disconnect them. Go to your local hardware store and purchase the white hoses that are used under you sink in your house. You'll have to buy a plastic male sleeve to make the hoses mate. This will put a soft connection between the pump and water lines.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab
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Old 07-02-2014, 08:22 AM   #4
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Join Date: Apr 2013
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We looked at the pump, now it's not doing it! Will assess further, but just from visual inspection, under foot of the bed, holding up the stiff mattress and board with our head, pump was soft mounted, had smooth but stiff blue tubing mostly, could not see any water leakage there. Don't know how we will check connection behind shower - no access panel! I will eventually see if I can hand tighten all connections under sinks.
Thanks all for the help.
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