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Old 07-25-2018, 11:48 AM   #1
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Weird Water Pump Behavior?

Last night, I went to put some water in my fresh tank and something weird happened. I had the water pump turned on, and the manifold was switched to "normal". I connected my water hose and then turned the manifold to "city fill", and the water pump started pumping? I turned on the water at the spigot so the fresh tank would fill, and the pump continued running? I went inside and checked for any open spigots and found none, the outside shower was right above my head, so I know it was off.

So, where was the pump pumping water to/from?

I've been thinking about it, and the only thing I could come up with is that perhaps when I turned the valves to "city fill", the system lost pressure? And the pump was trying then to pressurize my city hose? But then why would it continue to run while I was filling the tank?

I don't know... a real mystery... ideas?
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Old 07-25-2018, 12:21 PM   #2
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Our Seneca does the same thing... I'm tuning into this thread... since I have not figured it out yet either.
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Old 07-25-2018, 12:41 PM   #3
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The water pump in my Greyhawk just did the same thing. I went inside and turned the pump off.
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Old 07-25-2018, 01:01 PM   #4
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The water pump in my Greyhawk just did the same thing. I went inside and turned the pump off.
Whe would it be on if you are on city water (normal)?
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Old 07-25-2018, 01:13 PM   #5
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Whe would it be on if you are on city water (normal)?
The "normal" position on the manifold is for running off the on-board fresh tank using the pump. There is also a "City Fill" position which is when you want to use the "city" water pressure to fill the fresh tank (this is what I was doing, and I was doing it because I wanted to use that hose for something else). Then there is "City fixtures" which is when you want to run just off city water, and "Country fill" when you want the pump to actually pull water INTO the fresh tank from a hose on your water inlet.

I was in the "city fill" position putting water into my fresh tank, and I just can't figure out why the pump would run.

I'm glad that at least I'm not the only one though!
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Old 07-25-2018, 04:17 PM   #6
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Ok on my 2016 31ul there are 2 valves that must turned for whatever you want to do. Don't know if you have that type of manifold.
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Old 07-25-2018, 05:34 PM   #7
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Bob, being new to the Jayco Greyhawk I had the same experience a few weeks ago. I posted something about this on the forum because I wasnít sure if I was reading the manifold plate correctly. At the time I quickly ran into the coach to turn off the pump. Like you I had no idea where the water may be pumping to. I wish they would have put a second switch next to the manifold controls. That would make more sense than running back into the coach.
Hope you find a solution. Jimmyd
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Old 07-25-2018, 06:03 PM   #8
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on the greyhawk 30x there is a secondary water pump switch on the manifold. Did you by chance bump that not realizing it when connecting the hose? The pump will run regardless of the manifold settings. The other switch is on the main information panel. I can turn either one on. the switches are not on or off. it depends on the position of the other switch (if that makes sense).
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Old 07-25-2018, 07:42 PM   #9
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JPhealy the 2016 Greyhawk 29MV does not have that additional switch.
I wish it did. My previous coach had a switch at every water source. You could control it from any one of four locations. Not so on this model class c.
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Old 07-25-2018, 07:51 PM   #10
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Originally Posted by Camper_bob View Post
The "normal" position on the manifold is for running off the on-board fresh tank using the pump. There is also a "City Fill" position which is when you want to use the "city" water pressure to fill the fresh tank (this is what I was doing, and I was doing it because I wanted to use that hose for something else). Then there is "City fixtures" which is when you want to run just off city water, and "Country fill" when you want the pump to actually pull water INTO the fresh tank from a hose on your water inlet.

I was in the "city fill" position putting water into my fresh tank, and I just can't figure out why the pump would run.

I'm glad that at least I'm not the only one though!
You are completely correct. Brain fart on my part about the terminology. Question still remains, the pump does not need to be on during this operation unless you are in the country fill mode. That's why it was running.
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