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Old 06-17-2014, 12:22 AM   #1
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water pump quit!!

trying to finish up my re-plumbing of my water pump to quiet it down, and now it won't prime or shut off.

thoughts?

I eliminated the winterizing T and valves on the suction side of the pump and shortened the suction line. I assumed I had a vacuum leak, but I can manually suck water from the tank with ease (just like a straw). the discharge is routed through a 24" flexible kitchen sink supply hose. it worked fine last night, but after I modified the suction hose, it quit priming.

I might have damaged the wires to the shutoff pressure switch, I am going to check continuity tomorrow night. but that switch shouldn't affect pump suction, only shutoff.

any help would be appreciated.
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Old 06-17-2014, 04:03 AM   #2
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That would be my first guess.....pressure switch
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Old 06-18-2014, 07:08 AM   #3
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Make sure you open a faucet while trying to prime. Also make sure the suction side is leak free. How are you going to winterize now?
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Old 06-18-2014, 05:49 PM   #4
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Originally Posted by LiftedAWDAstro View Post
Make sure you open a faucet while trying to prime. Also make sure the suction side is leak free. How are you going to winterize now?
I opened all the faucets to try and prime, no luck. I thought I might have a vacuum leak in the line from the tank, but I was able to suck on the hose and got a mouthfull of water with no problem. (yeah gross, but test sat).

the pump and pressure switch tested fine last night on a bench with short hoses to/from a bucket of water. I will reinstall and see what happens.

as for winterizing, I have just used compressed air to blow the lines and waterheater clear for the past 7 years without issue. It really doesn't freeze hard here in the Puget sound area. I have an adapter I use for the city water connection and dial my compressor down to 50psi. I used a bicycle pump with my last trailer. Slow, but it worked.

I will get the pump back in this weekend and post an update.
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Old 06-19-2014, 01:38 AM   #5
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Put water in your lines with the city water hookup, then try it, sometimes back priming gets it started
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Old 06-19-2014, 09:29 AM   #6
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Put water in your lines with the city water hookup, then try it, sometimes back priming gets it started
Tried that too, no luck. I also have the waterheater bypassed so as to eliminate that as a source of air into the system.

so far I have
- bypassed the water heater
- filled and vented the system with city water.
- successfully syphoned water out of the TT water tank through the pump suction hose
- did a complete teardown of the pump, pressure switch, and strainer
- performed a successful bench test of the pump using a bucket of water and an external 12v source.

I can't think of anything else before I reinstall and attempt to try again.
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Old 06-19-2014, 10:10 AM   #7
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Is it possible that you have reversed positive and ground connections???
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Old 06-19-2014, 12:58 PM   #8
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Is it possible that you have reversed positive and ground connections???
not at the time. up to the point of failure, I had only added a flex hose to the discharge, remove the winterize "T" portion of the suction line, and added a 1/2" female coupling to mate the suction line to the pump.
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Old 06-19-2014, 07:23 PM   #9
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When you modified the suction side of the pump, did you by chance remove or damage the one-way valve? Depending on the pump you have, you may need to have a "check valve" on the supply line to maintain the pressure so the water doesn't just drain back into the tank.
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Old 06-25-2014, 10:05 AM   #10
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Okay, still not happy.
I solved the not pumping problem. I believe it was either an overheated pump, or an airleak between the suction hose and the female fitting to the pump. Either way, the pump works now.

HOWEVER, I purchased a pump silencing kit

http://www.amazon.com/SHURflo-94-591.../dp/B000WN5F96.

Now I notice significant vibration in the discharge hose.

I think the best I am going to be able to do is juggle how the flex hose is routed and coiled coming off the pump. getting it all tucked in under my kitchen cabinet is going to be tough.

other than to install an accumulator, does anyone have other ideas?

I hav
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