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Old 10-03-2016, 04:32 AM   #11
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Water pump not working

Well. It did happen again. Lost prime again at the dump station. I think I may be running too much water. I like to fill and dump the toilet a few times to flush the tank. I was able to use the remaining water in the anti-freeze fill line to get a prime back. And got it working again. Will be more careful in the future.
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Old 10-03-2016, 06:15 AM   #12
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Can't run to much water using a good pump. Might want to check that the holding tank vent (overflow) tube is clear. There's sometimes a screen over the end of that tube that gets clogged. Just a thought.
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Old 10-03-2016, 09:03 AM   #13
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If the system is properly sealed and vented, there's no way it should lose prime. Even if the tank vent is stopped up (which is a possibility) it would eventually stop sucking water, but wouldn't lose prime. I think you have a small leak on the suction side of the pump.

It could be that you have a stopped up tank vent as Bubbles said, and a suction leak that's not leaking until you get a little suction on the tank.

Check the vent screen and all the line and fittings between the pump and tank.
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Old 10-03-2016, 09:44 AM   #14
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Water pump not working

Just a thought here. Many times folks will utilize city water instead of FW from the tank. When disconnecting from the CG water a residual pressure will be left in the city water inlet. Then they attempt to use the FW via the pump. It works at first then stops pumping and the pump goes to a low volume hum. With Shurflo 2088 & 4008 Series pumps this is a bypass mode where the pump circulates within itself without any output. Basically, the pump can't overcome the residual city water pressure remaining in the line. Thus an air lock forms and you have pressure equalization. Turn your water pump off. Go outside to the city water connection, remove the cap and gently remove the screen washer. Stick you finger in the inlet and push the valve button (make sure you stand off to the side because there will be pressure coming out and you may get a bath). Relieve all the pressure, replace the screen washer and cap. Your water pump should start working as soon as you flip the switch. I always have the wife open both kitchen faucets when I turn off and disconnect city water at the CG to relieve internal residual pressure.
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Old 10-03-2016, 10:08 AM   #15
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Quote:
Originally Posted by D W View Post
Just a thought here. Many times folks will utilize city water instead of FW from the tank. When disconnecting from the CG water a residual pressure will be left in the city water inlet. Then they attempt to use the FW via the pump. It works at first then stops pumping and the pump goes to a low volume hum. With Shurflo 2088 & 4008 Series pumps this is a bypass mode where the pump circulates within itself without any output. Basically, the pump can't overcome the residual city water pressure remaining in the line. Thus an air lock forms and you have pressure equalization. Turn your water pump off. Go outside to the city water connection, remove the cap and gently remove the screen washer. Stick you finger in the inlet and push the valve button (make sure you stand off to the side because there will be pressure coming out and you may get a bath). Relieve all the pressure, replace the screen washer and cap. Your water pump should start working as soon as you flip the switch. I always have the wife open both kitchen faucets when I turn off and disconnect city water at the CG to relieve internal residual pressure.
You shouldn't have to push open the check valve at the city water connection. Just open a faucet. See attached.
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Old 10-03-2016, 10:20 AM   #16
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Sounds like the same issue I had with ours, brought it in and dealer replaced pump. The check valve was faulty in the pump.
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Old 10-03-2016, 12:36 PM   #17
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Originally Posted by rockfordroo View Post
You shouldn't have to push open the check valve at the city water connection. Just open a faucet. See attached.
All things being equal you'd think that's all it would take, but in my case the flow from the faucet just stopped and the pump went into by-pass mode. Same symptoms PEAS PA stated. I made quick call to FR and explained the situation to the Tech. The first thing he said was "tell me you didn't replace the pump". He said he has received dozens of calls where the owner has replaced the pump to the tune of $100, and they still have the same problem. He explained what the problem was and talked me through the steps over the phone (that I posted), and in 5 minutes my problem was solved. No pump relocation, no suction strainer disassembly, no pump valve replacement, and no pump replacement! So for now my money is on the FR Tech.
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Old 10-03-2016, 12:49 PM   #18
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Great that your problem is solved.
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