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Old 04-09-2017, 02:08 AM   #1
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Water pump problems

Here is what I have done so far; Bought another pump last year replaced it and got the coach winterized. Everything seemed to work just fine.

De-winterized the fifth-wheel with city water. Couldn't get the pump to pull the fresh water out of the tank. I gave up used bottles of water while on the road then hooked it up to city water.

We just got back from Spring Break and the pump will not pull the fluid into the lines. I switched the pumps again this year. It did not work! The pump runs but seems to not have the power to suck up the fluid. I almost gave up BUT then I pulled the line off of the outlet side, put my thumb on it to see if it was pressurizing. All of a sudden it kind of burped on that side and water came out, and the fluid started flowing. Happily I finished winterizing the coach.

Thought I'd recheck it after I had switched the pumps and again it didn't work. The valve to the fresh water tank has been closed.

I have never had this much problem with water pumps in my life and I've owned other fifth wheels with zero problems winterizing.

Both pumps are Shurflo. I'm wondering if I need to buy a larger pump, I'm ready to just give this fifth-wheel away for free. lol It is so frustrating! It seems the more complex they make the system the more problems.

It is a pretty simple system, water in, water out, I understand that air leaks are a main issue but for the life of me I can't seem to make it work on a regular basis and it doesn't seem to be an air leak. It seems like the pump is getting some kind of a vapor lock. It did have a filter inline that had a plastic case that broke a year ago and created an air leak. I took this out of the line and everything worked fine for a while.

Wall out, Wall back in, wall out, wall back in, wall out, wall back in. It really shouldn't be this hard.

Any ideas would be appreciated. When I get my patience back I will work on it again. Probably not until I get to our next destination for summer vacation.
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Old 04-09-2017, 02:33 AM   #2
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I think I read somewhere on here about a one way valve problem on here. Someone may chime in.
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Old 04-09-2017, 02:51 AM   #3
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Also make sure the valve is off for suction of your antifreeze pigtail. Just as a precaution make sure the plug is also in the end of the pigtail
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Old 04-09-2017, 03:18 AM   #4
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Also make sure the valve is off for suction of your antifreeze pigtail. Just as a precaution make sure the plug is also in the end of the pigtail
And tightend they leak air even when you think they're tight
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Old 04-09-2017, 02:26 PM   #5
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Wster pump problems

I have slept on this problem and this might be operator error. I need to check both fittings going to the pump. I'm thinking maybe I have lost a washer in one of those fittings and even though they are tight one might be allowing air into the system.

I hope I'm right.
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Old 04-09-2017, 03:17 PM   #6
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I had a similar problem when trying to winterize this winter. Took the pump out anticipating that I would have to buy a new one. On whim I took the pump apart not thinking I could fix it. However there was a circular disk that I presume is a valve that was stuck. After I pressed on it it was freed up and after reassembly it worked. Don't know for how long but we will see.
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Old 04-10-2017, 12:59 PM   #7
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I had a similar problem when trying to winterize this winter. Took the pump out anticipating that I would have to buy a new one. On whim I took the pump apart not thinking I could fix it. However there was a circular disk that I presume is a valve that was stuck. After I pressed on it it was freed up and after reassembly it worked. Don't know for how long but we will see.
Thank you so much for your input. I have an extra pump so I will play with it and see what it looks like.
Such a simple system should not create so many problems. I'm thinking of buying a larger pump that may have more suction
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Old 04-10-2017, 05:16 PM   #8
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You may be past this, but is the hand valve down by the pump open (isolates tank from pump).

Also, the pumps have difficulty pulling suction if deadheading air against a closed system. Did you try opening a valve downstream on the system while priming the pump?
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Old 04-10-2017, 06:36 PM   #9
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You may be past this, but is the hand valve down by the pump open (isolates tank from pump).

Also, the pumps have difficulty pulling suction if deadheading air against a closed system. Did you try opening a valve downstream on the system while priming the pump?
I opened the faucets which seems to always work. These pumps may need a different kind of priming. As I mentioned I took off the output side of the hose and place my thumb on the pump hole. pressed and released it a couple of times and then it let go with a burp of water and the suction started working. It may be a poor valve in these pumps. Its just odd that after buying another pump just like it they both act the same way.
I'm leaning to maybe and air leak somewhere. Just a weird weird problem
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Old 04-10-2017, 08:40 PM   #10
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The common air leak was not getting the antifreeze cap tight enough on the draft hose. Good luck, I hate those kind of issues.
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