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Old 03-22-2019, 10:28 AM   #1
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Water Pump Issue

I have a 5 year old ShuFlo Revolution water pump which replaced the noisy OEM pump. At the end of the 2018 season, it ran but did not pump water and I had to get a hand pump to winterize. We are planning a trip in a month and I need to get it resolved. Since it is still winter here (we are expecting a foot of snow by tomorrow morning), I can't fill the fresh water tank for trouble shooting. When it first happened, I tapped the city water check valve, but it didn't fix it. A friend suggested the pump may be worn enough that it can no longer prime itself. I can just order a new pump and replace it, but that is the most expensive solution that is not the problem.
Any ideas? I did install a ShurFlo filter at the time of installing the pump and a permanent winterizing valve. Just to review, the pump runs, but we get no water.
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Old 03-22-2019, 10:49 AM   #2
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City water check valve is on discharge side of pump so would not have any affect on pump priming....just leak when pump running

Issue of pump not priming is on suction side of pump


Pump can not prime sucking air






Winterizing valve?
Check clamps/fittings/strainer on pump suction side
Winterizing valve....
It should CLOSE off fresh water tank suction when turned to use for winterizing.



Does it have a hose that you stick in jug ......fill the hose with water and then place in full jug/bottle/bucket of water and run pump
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Old 03-22-2019, 10:54 AM   #3
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I would check winterizing valves to make sure they are properly set.
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Old 03-22-2019, 10:57 AM   #4
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Old Biscuit suggested winterizing valves while I was typing.
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Old 03-22-2019, 11:32 AM   #5
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When weather permits, I will check winterizing valves, but issue started while on last camping trip. The reason I tapped the city water check valve is that when it hasn't seated, the pump will not quit running because it fails to build pressure.
Old Biscuit, I do run a hose into a jug for winterizing, but couldn't as it wasn't sucking anything. I need to revisit that whole process. Naturally, it is behind lots of plumbing and wiring. I also found no signs that water was being pumped out somewhere as there was no dripping under the trailer. Once weather permits, I could just take the pump out and run a hose from the inlet side into a bucket of water, check the strainer and winterizing components.
Has anyone had a pump wear out? How about some kind of check valve at the fresh tank? It's hard to deal with this as the snow falls. At this point, I am not even sure we'll be able to get the fiver out by late April. If I can't get it fixed by then, we'll use water jugs for on the road and I can look at it when we get to Virginia.
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Old 03-22-2019, 01:03 PM   #6
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you have best solution..I to would do it easy way and just remove it{least on mine just lean in and easy. then yo can take head off and check seals ect. and if even turning. noisy or brushes. bearing ect.. just need a 2 buck cigarette light cord, off ends and you have cord for testing many things..
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Old 03-22-2019, 06:22 PM   #7
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They sell rebuild kits pretty cheap. Just put "repair shurflo pump" in Youtube and a bunch of how to vids pop up with part numbers. Super easy to rebuild.
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Old 03-22-2019, 07:38 PM   #8
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You could pull it out, and "bench check" it after disassembly to check the rubber vanes for debris and hard water stuff stuck in there.

I just screw a fitting on the pump and put a hose on the suction side in a bucket of water. I have a spare 12V battery I connected to test it.

Ended up replacing ours.
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Old 03-23-2019, 06:27 AM   #9
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If you can get at the pump fairly easily you could take the inlet and outlet hoses off. Rig up a section of flexible hose on both sides. Place suction hose into bucket of water, outlet to the ground. This isolates the pump and doesn't involve having to re-winterize the coach. Turn on pump using house controls. If it pumps water then your problem is elsewhere. After testing run a little shot of antifreeze through the pump.
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Old 03-23-2019, 07:53 AM   #10
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It probably just needs a new rubber valve assembly. It doesn't take much to jam it up. I replaced a 22 year old Shurflo with the new 4008 pump when the old one stopped priming and I replaced the valve on the old one for a backup. I bought the screen filter for the new pump but the space in my enclosed underbelly was so tight that I couldn't easily fit it in, so I left it off thinking that the old one lasted forever without a filter. Less than 5 gallons of water later the new pump completely stopped pumping water so I switched the old repaired pump back in and it worked great for the next 3 weeks of our trip. when I inspected the new pump there were a few small plastic shavings caught in the valves that kept them from sealing.
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Old 03-23-2019, 10:06 AM   #11
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Maybe a more simple answer: the inlet screen on the pump is clogged with debris or sand from the tank. It's a fairly common problem. You've had 5 years of use, which isn't a lot of wear & tear but is potentially a lot of water sucked through the inlet screen. One tank fill from a sandy well can be enough to clog it up.



In any case, make sure you can pull water from the tank before buying another pump.
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Old 03-23-2019, 11:27 AM   #12
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I agree Gary, the screen should be visible easily and can tell by looking. but ive seen so many pumps hidden and backwards, or put on a board that vibrates n noisy, makes ya wonder.. if that is the case just replumb, easier than reinstalling stupid way.
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Old 03-23-2019, 05:21 PM   #13
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Like Old Biscuit said, more than likely sucking air on the low pressure side. Loose fitting somewhere.

Check the easy stuff before ripping things apart.
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Old 04-13-2019, 10:09 AM   #14
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We finally got a warm day and the the snow has melted right around the fiver so I cleared part of the basement to take a look. When I ordered the new pump a few years ago, I was encouraged to order a filter and did. I took the filter off and looked inside. Gross!
The bottom was completely blocked with black stuff and a lot of the strainer screen was as well. I took it inside and cleaned as well as I could with a toothbrush as the screen didn't want to come out and a stray wire cut my finger.
I use bleach with the first tank fill and flush it out, then reduced sanitizer after. I am guessing the crud gets washed off the tank sides as we go down the road. I haven't tested to see if it is working as we have another month of freezing ahead, but I suspect this will fix the problem.
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