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Old 11-15-2012, 05:50 PM   #15
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Quote:
Originally Posted by Midniteoyl View Post
You DO want to find and fix the problem, even if you think its just he inlet valve. Starting so often will eventually kill the pump..
Thanks for the heads up and since I started living in the RV for the last 2-3 weeks and will be for the winter, I have been shutting the power switch off on the control panel when the water pump is not in use. That does gets annoying after a while :(

I'm hoping that by testing the outlet of the pump will identify and eliminate the RV plumbing...
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Old 11-16-2012, 10:41 PM   #16
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UPDATE: I investigated the whole situation further, and found that the problem was not any leaking water pipes in the RV, but was the water pump itself.

It's a ShurFlo model, and the pump housing is held together with 6-8 screws with a gasket in between. Well the majority of the screws were 1/4 turn loose, either from the factory or from use...?

I tightened all the screws and it no longer leaks NOR comes on when all the faucets are closed.

In the attached photo, you can see the joint in the pump head (arrows) where there was a minute leak (enough to cause the problem)

You also see with the red circles where the @6-8 screws that needed to be tightened to seal the two housing together.

Either poorly constructed and tightened from the factory, OR came loose from use and vibration...?

I have owned the RV for @ 1 year, but the screws that were used to hold it down to the floor were rusted, so good thing that I found and solved the "pulsing" problem....
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Old 11-16-2012, 11:00 PM   #17
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When I re-installed the pump, I put some "pipe dope" on the threads of the fittings since I couldn't find my teflon tape.

Are we supposed to put teflon or similar products on those threads?

I also noticed that ShurFlo recommends not using stiff grey PVC pipes at the inlet or outlet ports. They recommend flexible tubing for the first foot going into AND out of the pump. Hmmm, mine is connected directly to my grey PVC pex water lines.

I wonder if the vibration will break/cause a leak further down the road?
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Old 11-16-2012, 11:04 PM   #18
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Quote:
Originally Posted by imorton
Hello Everyone, quick question...

My 12v water pump seems to pulse "on" for a 1/2 second and does this @ every 90 seconds. I have looked everywhere that I can physically see where the grey PVC water lines run and I CANNOT see any leaks anywhere.

Is it possibly normal (or a sign that the pump is coming due for replacement) that it comes "on" ever so briefly every 1-2 minutes?

I have a houseboat and I could swear that the water pump on the boat never pulses unless I open a tap/faucet.

The pump works fine when I open a faucet etc... But when I close all the taps and faucets etc... It just does a very small pulse (the time it takes to snap your fingers) , so I don't know if this normal behavior as it is trying to maintain 45 lbs of pressure...?

Anybody else notice their 12v water pump do the same thing?

IAN...
Had a similar issue after we disconnected from shore water I ran shore water through system with all faucets open them disconnected shore water - no more cycling of the 12v pump.
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Old 11-17-2012, 12:12 AM   #19
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Not sure I understand? You are saying that the city water pressure and back pressure helped to clean out the check valve on the 12v water pump?
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Old 11-17-2012, 07:22 AM   #20
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Imorton, glad you got her fixed and pulse free! I know that short section of flexible hose on the inlet and outlet will keep the pump noise and vibrations from transmitting to the harder PEX tubing. Good Job, and thanks for posting the fix to your problem.
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Old 11-17-2012, 07:41 AM   #21
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Ideally, the first 2' of both suction and delivery pipe should be as soft a pipe as can still handle the pressure (usually reinforced pressure hose) and the pipe should form a loop with none of the loop touching itself or anything else. This should reduce the pump noise considerably.
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Old 11-17-2012, 10:33 AM   #22
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Ideally, the first 2' of both suction and delivery pipe should be as soft a pipe as can still handle the pressure (usually reinforced pressure hose) and the pipe should form a loop with none of the loop touching itself or anything else. This should reduce the pump noise considerably.
Hi, thanks for the reply. That's the issue that I have, the inlet is flexible hose, yet the outlet port is connected directly to the grey PVC Pex piping.

From the outlet on the pump there's @2 inches of Pex and a 90 degree bend going behind the wall towards the shower etc....

The noise isn't really the issue now, but I am wondering if I should add a flexible pipe to the outlet so that the vibration doesn't cause the Grey PVC Pex pipe & fittings to crack/break/loosen from the pumps vibration?

At least now the pump doesn't cycle or pulse unnecessarily.
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Old 11-17-2012, 10:52 AM   #23
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I would add a flexible loop as described above... Yes.

Glad you found the leak
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Old 11-18-2012, 03:47 PM   #24
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Not sure what it did, but my guess is that there was a grain or two of grit holding something open and letting the pump cycle. If everything is tight, (No Leaks) the system should hold pressure and the pump not cycle.
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