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Old 09-20-2019, 02:34 PM   #1
Wmass camper
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Join Date: Jan 2019
Location: Holyoke
Posts: 20
M.O.C. #23350

2018 MHC 330RL
When I turned the winterization valve on, then turned the pump on, the pump would not draw the antifreeze into the system. Does anyone have any idea why it may not be working. Worked perfectly last winterization season. Did a work around, but would rather have it working appropriately for ease of operation!
2018 MHC 330RL
2019 Ford F250, 4.30 axle ratio,
Ext cab, 6.2L, gas
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Old 09-20-2019, 04:45 PM   #2
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Join Date: Oct 2012
Location: Box Elder
Posts: 3,219
M.O.C. #12947
Maybe your hose washers are not sealing as well as they did the last time you winterized. I remember discussions about putting a second washer I your connections.
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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Old 09-20-2019, 05:54 PM   #3
Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 5,686
M.O.C. #6433
Agree with Bob. Typically air leaking in the hose fitting not sealing well. Some have added a second washer. I, on the other hand, had to sand down my single washer. Mine did not have enough threads on the connection to pull it down tight.
Also I keep my antifreeze jug up at the level of the connection to reduce draw height.
Bill & Patricia

2007 3075RL
2012 F350 SRW CC LB FX4 6.7
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Old 09-20-2019, 05:58 PM   #4
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Join Date: Mar 2016
Location: Catoosa
Posts: 594
M.O.C. #18384
Some have mentioned turning the debris screen around backwards to hold the check valve open. I have two washers in mine and hold the jug higher than the intake. Still sometimes I need to " prime it by moving the hose up and down inside the jug.
2015 3100RL legacy...2005 Ford F-250 CC SB. Tows like a charm! 4/19 Updated to 2017 Chevy 3500 CC SB SRW -hope it tows as well as my F 250 did!
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Old 09-20-2019, 09:48 PM   #5
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Location: Medicine Hat
Posts: 27
M.O.C. #9836
Turn the screen washer at the hose connection around in the winterize port so that it holds the check valve open due to the pump not being able to pull enough suction to overcome the valve. Slightest air leak at the connection will prevent flow also. Just remember to turn the screen washer back around after done. I only use 1 washer.
Easy peasy.
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