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Old 07-03-2016, 09:39 AM   #1
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Water pump losing prime

I have posted last season about this, I got a new pump installed by me, it primes and then over night looses prime and not much water the next day. I see some debri in filter sometimes. I put thread tape on the inlet of pump. I have checked for loose fittings and I'm frustrated and mad. We don't use the holding tank much but when we do I want it to work. It's a 16 nitro xlr 305vlr. I have had it 15 months and it has never worked well. When I put pump on I filled tank to over flow and primed then and it was working. Now the same thing. Any suggestions?
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Old 07-03-2016, 09:52 AM   #2
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Start over. Had to be a leak somewhere ahead of the pump allowing air into the line.....hard to find and it does not take much of a leak. Could be internal (pump)

How long is the suction line?
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Old 07-03-2016, 10:02 AM   #3
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Suction line is can't be seen so I'm have to take down my underbelly to see
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Old 07-03-2016, 10:02 AM   #4
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It has to be before the pump right
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Old 07-03-2016, 11:55 AM   #5
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Arkguy,,,,,did you have this priming problem before you installed the pump? If not.......there you are. BTW.....you don't use thread seal on plastic parts.
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Old 07-03-2016, 12:11 PM   #6
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water pump loosing prime

First off, thread tape is not required or necessary on the fitting threads. Check the rubber seal inside the line fitting that connects to the pump. Make sure the line fitting or the pump fitting is not cracked or has been cross threaded. If equipped with a strainer at pump check it or better yet remove it to see if that is the problem. I have had numerous problems with in-line filters/strainers causing this problem(most common). Since you state you changed the pump last step would be to make sure there are no kinks in the line between the tank and pump. Sometimes a staple or screw can puncture a hole. Sometimes removing the line at pump and blowing a little air through it works. Be sure to remove the water tank cap and don't blow too much air through there because the tank could be damaged. Good luck
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Old 07-03-2016, 12:22 PM   #7
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Quote:
Originally Posted by Arkguy29 View Post
It has to be before the pump right
Yes if your loosing prime it is from the Suction side of pump to the FW tank! I see you live in a Cold area,do you have a "Winterizing Valve" if so this could be the issue"Bad or turned the wrong way"! Crap in Filter, is this the Little "Pre Filter" before the pump? This is also a problem area that is prone to "Sucking Air! Youroo!! PS I use Tape on all my "Fluid and Air Threads"!
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Old 07-03-2016, 12:30 PM   #8
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Arkguy,,,,,are you sure you put that little white rubber gasket back in the end of the hose, and on right, where it seats and seals the hose connection on the inlet side of the pump???
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Old 07-03-2016, 12:32 PM   #9
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Could it be the valve outside that is city water. If I remember right it has a check valve in it and if not sealed off it will stop priming all together.
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Old 07-03-2016, 12:49 PM   #10
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Could it be the valve outside that is city water. If I remember right it has a check valve in it and if not sealed off it will stop priming all together.
City water check valve should be on the Pressure side when on Pump! Youroo!!
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