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Old 08-29-2011, 12:12 PM   #1
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Water pump

On our 2003 DSDP, (not hooked up to water supply) our water pump now runs about every 20 seconds or so, even when we're not using any water. It just comes on for a couple of seconds, then shuts off, only to repeat...... Any thoughts on what might be causing this? Are we losing pressure somewhere in a line? Incidentally, our actual pressure has never been better.......

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Old 08-29-2011, 01:00 PM   #2
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I'd have to agree with your loss of pressure do to a leak someplace.

John & Cathy R.
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Old 08-29-2011, 02:45 PM   #3
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It sounds like a small leak to me.
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Old 08-29-2011, 03:10 PM   #4
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Could be a leak or the check valves in the pump leaking. Either can cause this problem. Some obvious places to look for leaks is at you shore water connection. There should be a check valve there that may be leaking. Also if your unit has a valve you turn for filling the fresh water tank then make sure the valve is completely turned in the direction you want.

Your pump is old enough to have check valve problems. You can rebuild the pump rather than buy a new one. One sure way to determine if it is the pump check valves is to top off your fresh water tank then stay connected to your water supply. If your fresh water tank starts to overflow (this could take several days) you can be sure you have bad check valves. You won't see a lot of water dripping, but should notice a wet spot under your rig.
Pete - Full Timing
2000 Country Coach Magna 40', CAT C10, #5892
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Old 08-29-2011, 03:14 PM   #5
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If you look for a leak and can't find any evidence of a leak. It is probably your check valve in the pump.
1998 Pace Arrow 35 ft. F53 Ford V10 2012 Honda Civic toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.
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Old 08-29-2011, 03:46 PM   #6
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Thanks for the advice! Will do......
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Old 08-29-2011, 05:00 PM   #7
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Check your city fill/tank fill valve to assure it is all the way on city fill. If even a few degrees in the middle it will cause the pump to cycle.

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Old 08-30-2011, 01:08 AM   #8
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My coach is pre-plumbed for a washing machine, if I don't bleed out all the air from those lines my pump cycles; twice a min, until I do. But as other posters have stated, if no external leaks, suspect pump valves.

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