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Open Roads Forum  >  Class A Motorhomes

 > Weird water leak...or...???

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Jim@HiTek

Gresham, OR, USA

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Posted: 03/03/12 05:25pm Link  |  Print  |  Notify Moderator

A couple months ago, I checked in my water bay and discovered a puddle of water around the water pump. An 18yo Sureflow. I removed it and found that it was a seal leak at the pump housing seam.

So I took it apart and cleaned it up, found there was nothing broken. Put it back together. Everything looked good, operated fine with no seam leak.

Now my problem. Ever since I did that maintenance job on the pump, it's been acting like I have a water leak. If I turn off the pump overnight, next morning it takes several seconds to come up to pressure. If I forget to shut it off after using it, anywhere from 10 minutes to an hour later, it runs without my having used any water.

I'm pretty familiar with my RV and the plumbing but I cannot for the life of me find any leak! I've checked everywhere...at least I think so. Under all sinks, behind the toilet, in the water bay, under the rig where the earth is dry and I would be able to see a wet spot. Local humidity is 54% so any leak shouldn't air dry to quickly to find...I think.

Shore water inlet has a pressure gauge installed...not leaking there. Shower, inside or outside, isn't leaking, toilet isn't leaking, sink faucets aren't leaking, no mystery puddles of water anywhere, no water stained wood anywhere I can find, and I've looked...

I'm at my wits end. Does anyone have a trick that might lead me to what I suspect is an air leak into the system (that somehow closes when pressure come up), not a water leak?


Jim@HiTek
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driveby

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Posted: 03/03/12 05:37pm Link  |  Print  |  Notify Moderator

Any chance there is an air bubble not fully out of the system yet and that is the issue? I know my aquarium pump makes funny noises for a good 24 hours after I clean. And I *know* that doesn't leak. It's all about air bubbles that seem to take forever to clear out. It runs full time (obviously).


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Jim@HiTek

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Posted: 03/03/12 05:51pm Link  |  Print  |  Notify Moderator

Huh. I'd not considered that driveby...but I don't know how to test for it. My pump is directly below the water tank so where could a bubble hide? Any idea?

driveby

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Posted: 03/03/12 05:54pm Link  |  Print  |  Notify Moderator

Dunno where, but maybe open all the faucets and run them hot then cold for a bunch of minutes. Toilet too. That should force a bubble out.

failing that maybe a drive down a bumpy road to "jiggle it out"

Jim@HiTek

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Posted: 03/03/12 05:59pm Link  |  Print  |  Notify Moderator

I'll try that right now. Thx.


On Edit: HAH!!!! Got a big pulse of air out of the shower! That might have been it. Testing now.

Old-Biscuit

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Posted: 03/03/12 06:06pm Link  |  Print  |  Notify Moderator

That sounds like the internal check valve is leaking allowing a little water to backflow thru pump into fresh water tank which drops the line pressure. That will cause pump to run temporarily to get pressure back up. Not surprising with an 18 yr. old pump.....you can get new pump internals, take it back apart and check/clean the diaphragms OR get new pump.
New pump.....haven't heard anything good about the 'Smart Sensor' ones.

TURBODOG1000

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Posted: 03/03/12 06:13pm Link  |  Print  |  Notify Moderator

X2 On a leaking check valve.


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Jim@HiTek

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Posted: 03/03/12 06:21pm Link  |  Print  |  Notify Moderator

Well, guys, thanks, but 15 minutes later, after getting the air bubble out of the shower plumbing my pump isn't running 4-6 seconds to come up to pressure like it was. Now it only takes 1-2 seconds...like it use to.

I owe driveby a couple beers. Or virgin pina coladas if that's his choice.

THANKS DRIVEBY!! Such a simple problem with a simple solution.

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Posted: 03/03/12 06:53pm Link  |  Print  |  Notify Moderator

Wow. Who (unless knowledgeable like driveby) would think of an air problem when looking at a water problem? Yet it only took 12 minutes for the OP to get the right solution.

This is exactly what I think this Forum is for and isn't it great?

Gotta love it.

Jim@HiTek

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Posted: 03/03/12 07:10pm Link  |  Print  |  Notify Moderator

I KNOW. Pretty cool. That's why I always start here for solutions to problems with my RV.

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