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Old 10-08-2016, 08:00 AM   #1
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Water pump problem

Ok this just started. if I have the water pump turned on and no water being used the pump will cycles every few seconds so It's loosing pressure somewhere.I don't see anything leaking. any ideas?
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Old 10-08-2016, 08:12 AM   #2
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If all faucets are closed the water is going somewhere. Losing pressure is a result of water escaping somewhere. Good luck.

You could try letting the pump cycle off, turn it off, and wait a few minutes and see if the system actually looses pressure.
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Old 10-08-2016, 08:16 AM   #3
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If you have an outside or water compartment shower head, make sure the water valves are closed, not just the head turned off. Same for the shower itself.
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Old 10-08-2016, 08:25 AM   #4
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Ok this just started. if I have the water pump turned on and no water being used the pump will cycles every few seconds so It's loosing pressure somewhere.I don't see anything leaking. any ideas?
If no leaks any where, and you are sure of this, you are going to have to pull the pump, it is likely that the diaphragm inside has failed, not allowing pressure to build up and stay there. And if this is the case, a new pump will be in order..........how old is it/your Coach?
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Old 10-08-2016, 08:30 AM   #5
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I would not get too excited about a leak yet. There is a check valve that keeps water from back flowing through the pump to the tank. Over time minerals or sand can build and allow the valve to not completely close. This lets the pressure drop and the pump runs again to bring the pressure back up. Some pumps have replacement valves, some rebuild kits and some just replace. With what you describe, your talking enough water, if you do have a leak it would show. We are talking cups not drips.

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Old 10-08-2016, 08:41 AM   #6
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Ok this just started. if I have the water pump turned on and no water being used the pump will cycles every few seconds so It's loosing pressure somewhere.I don't see anything leaking. any ideas?
Mak 1
It's not uncommon for a RV water pump to develop an "internal leak", (in the "diaphragm" or in the "presser switch").
If/when they do you will not be able to see any leaking water but the pump will cycle on/off continuously.
(Repair kits are available for most RV water pumps)
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Old 10-08-2016, 09:48 AM   #7
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Another cause is if you have a valve the switches from shore power water to tank fill. This is what I have. The valve could be bypassing and letting water just recirculate back to tank.

We developed a leak on our way back from Alaska, the pump would cycle occasionally. Could never really find a leak until it got worse and then noticed that water was leaking near the refrigerator drain directly below the water heater. Looked in that compartment where the water heater is, along with inverter & transfer switch, and there was ~1/2" water in the compartment with no visible leaks from any of the piping. Once we got home I looked close and found that there was water dripping from below the water heater. Removed it and took the styrofoam insulation off the exterior, pressurized it with water and found a pin hole leak at the seam. Decided to replace water heater instead of trying to repair by welding figuring there were probably other bad spots in the weld that would eventually start leaking.
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Old 10-08-2016, 10:03 AM   #8
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I am on same page with diaphragm leaking or a valve leaking. On our coach I have a water fill valve that fills water tank while hooked up to city water. If I leave the fill valve open with the water pump on the water will circulate and keep the pump running. So maybe you have a valve leaking somewhere but an inline leak, not external. Do you have a water heater by pass valve that is maybe not turned all the way? Follow the lines and see if you can hear of feel a leak. Good luck.
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Old 10-11-2016, 05:24 PM   #9
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Ok we camped for a week.always had water services.checked system after disconnecting at campsite.seems to be ok now,builds pressure and does not cycle till someone uses water,
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Old 10-14-2016, 10:29 AM   #10
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I had this going on for a few months on our 2003 Adventurer. Didn't find any external leaks. Over time, ended up with a low hum continually, changed out the pump.
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