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Old 10-21-2021, 03:19 PM   #1
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Water pump on 2516g will not draw antifreeze

I am winterizing a 2516g and trying to pump antifreeze through the water lines. We only use the city water hookup during our camping trips. The internal pump runs when turned on, but does not start drawing up antifreeze. Because we don't use the internal pump, does it need priming? If so, is there an easy way to prime that internal pump? There is no valve inside the camper, only the one under the camper at the fresh water tank. I have all the valves set properly, but the pump does not draw when turned on. Any suggestions will be appreciated.
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Old 10-21-2021, 04:24 PM   #2
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Are you trying to draw the antifreeze through the pump with a bypass tube or are you putting the antifreeze in the fresh tank and drawing it through the pump that way.
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Old 10-21-2021, 04:29 PM   #3
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Where are you trying to draw the antifreeze from?
If you have a winterizing connection on the pump there has to be a valve to select either the fresh tank or the winterizing hose/connection.

If you put antifreeze in the fresh tank (not recommended) you may not have enough in it for the pump to pick up. That's one of the reasons to not put antifreeze in your fresh tank. It can take MANY gallons to reach the suction port... and... it takes LOTS AND LOTS of flushing to get it out come spring.
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Old 10-21-2021, 06:34 PM   #4
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Water pump on 2516g will not draw antifreeze

I am trying to draw the antifreeze from a 3/8 bypass tube that is attached to the valve on the fresh water line, near the fresh water tank. The fresh water tank is empty. There is no closer valve to the fresh water pump inside the camper.
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Old 10-21-2021, 10:44 PM   #5
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Quote:
Originally Posted by NoTrumpAce View Post
I am trying to draw the antifreeze from a 3/8 bypass tube that is attached to the valve on the fresh water line, near the fresh water tank. The fresh water tank is empty. There is no closer valve to the fresh water pump inside the camper.

Not sure if this is the valve you're referring to, but the way you have described it, sounds like the same as my popup. And if so, this bypass valve ( attached to blue pex line ) needs to be turned so as to block the freshwater flow. Then you can begin your winterizing by attaching your hose to the nipple on the valve. Hopefully this helps. Please excuse the sideways pic.
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Old 10-22-2021, 05:39 AM   #6
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The valve in my grey wolf was half buried in spray foam where it goes through the floor into the fresh water tank.
Had to dig a little to find it.
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Old 10-22-2021, 01:44 PM   #7
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The second year I was winterizing my rig, it did not draw antifreeze. I learned that the two drain tubes had to be plugged or closed.
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Old 10-22-2021, 02:57 PM   #8
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Hold your antifreeze hose up and pour some into the hose to help prime. Once it starts pulling it in you can drop it into the jug to suck it out.
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Old 10-22-2021, 07:41 PM   #9
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Make sure to hold the antifreeze bottle higher than the inlet
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Old 10-22-2021, 08:13 PM   #10
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did you open your water faucet?
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Old 10-22-2021, 09:33 PM   #11
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In order to suck antifreeze (or water if you boondock) you need to open a faucet to create a demand on the output side.

It will not create the vacuum needed to suck antifreeze (or water from the fresh water tank) if there is a closed system on the other side that is trying to be pressurized.
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Old 10-25-2021, 10:52 AM   #12
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Water pump on 2516g will not draw antifreeze

Thank you for all the suggestions. I really appreciate the time that people take to respond.
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Old 10-29-2021, 12:42 PM   #13
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Were you able to figure it out?
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Old 10-29-2021, 01:51 PM   #14
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I am betting on he opened a faucet.
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Old 11-01-2021, 10:21 AM   #15
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Water pump on 2516g will not draw antifreeze

None of the suggestions helped, including opening the faucet. I started to think the pump was defective. I disconnected the pump from the water lines, but left it wired, put it over a bucket in the camper, put my vinyl tube in the intake side of the pump and into a gallon of antifreeze. Turned on the switch and it pumped like a champ. Put the pump back into the water lines, left a faucet open and it pumped as expected. Mission accomplished, but I am still puzzled about the pump, which says in the manual that it is self priming. Because we do not boondock, I wonder if the pump is affected by the long time between uses.
Thanks, everybody who responded.
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Old 11-01-2021, 10:53 AM   #16
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Maybe the low-point drains in the water lines are open and thus there's no suction? On my camper these are T-valves (push/pull) in each the hot and cold lines (red and blue, respectively) that run along the floor inside a cupboard under the swing-up sink.
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Old 11-01-2021, 08:19 PM   #17
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If the 3 way valve has worked to winterize before and no disassemble has occurred, disregard this solution.

Assuming that you have a 3 way valve that controls the direction of the pump suction, normally the lever on that 3 way valve should be in the directions of the desired path.

That 3 way valve could be installed backwards, the suction port on top could be directed to the fresh water tank and not the pump.

With the 3 way valve in position to the draw tube, not the fresh water tank.

1. Feel if there is any suction on the draw tube with the pump running.

2. Blow on the draw tube, with the pump off and water valves off, if you can pass air, chances are that you are blowing into the fresh water tank and not the pump and
the 3 way valve is either installed backwards or defective.

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