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Old 11-19-2018, 08:14 AM   #1
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White hose run out from underneath front of RV

Iíve got a white hose coming from underneath my RV in the front and it is steadily dripping water. Does anyone know what this is or what it goes to and have to stop it. There is a small lake under my RV but thereís no leaks in the RV or in the belly. Any help would be appreciated.
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Old 11-19-2018, 08:26 AM   #2
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I’ve got a white hose coming from underneath my RV in the front and it is steadily dripping water. Does anyone know what this is or what it goes to and have to stop it. There is a small lake under my RV but there’s no leaks in the RV or in the belly. Any help would be appreciated.
It's possible that your fresh water tank has filled up due to a bad check valve in your water pump.

The white hose is probably the overflow vent hose.

Turn off your city water and run off of your fresh water tank with the water pump.
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Old 11-19-2018, 08:28 AM   #3
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Make? Model? Year? Photos? New or used? (If used, it could be something the previous owner added.)
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Old 11-19-2018, 08:28 AM   #4
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Iím thinking itís a check valve also. Where would it be located.
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Old 11-19-2018, 08:35 AM   #5
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If you are connected to city water try the following.
Turn off city water
turn on any faucet until there is no flow then turn off
turn on water pump and let it run until it stops
open any faucet and let it run for 30 sec
shut off faucet and allow water pump to run until it stops
turn off water pump.
turn city water back on.

Drain FW tank


This should reseat the check valve in the water pump.
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Old 11-19-2018, 08:39 AM   #6
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I’m thinking it’s a check valve also. Where would it be located.
If it's the check valve mentioned by JohnD10, it's probably INSIDE the water pump... but could be before or after the water pump. Do a Search for "Fresh water tank filling" or some such. There are mechanical procedures which sometimes overcome the situation.
EDIT: Slower typist... I see Bob included the procedure in post #5.

Next, please answer the questions in post #3 .
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Old 11-19-2018, 08:44 AM   #7
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Iím thinking itís a check valve also. Where would it be located.
If Flybob's idea doesn't work, then you can add a check valve inline in front or after your water pump.

You don't have to replace the pump.

I did mine earlier this year...took me five minutes and no tools to fix!

Not sure what trailer you have (is it a 5'ver or a TT)?

Mine is a 5'ver, so the water pump is right next to the water heater just inside the basement on the offdoor side.
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Old 11-19-2018, 08:55 AM   #8
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Originally Posted by JohnD10 View Post
If Flybob's idea doesn't work, then you can add a check valve inline in front or after your water pump.

You don't have to replace the pump.

I did mine earlier this year...took me five minutes and no tools to fix!

Not sure what trailer you have (is it a 5'ver or a TT)?

Mine is a 5'ver, so the water pump is right next to the water heater just inside the basement on the offdoor side.
This works every time. Easy, comparatively cheap, and more reliable fix to the fresh water tank fill problem, than replacing the pump. The best location is before the pump (on the receive side of the pump), vice the pressurized side.
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Old 11-19-2018, 09:07 AM   #9
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That is where I put mine.

One, it was much easier to do as I didn't have to remove the water pump to install it.

And two, it just made more sense to me to put it there!

I've caught a lot of grief here from the self proclaimed 'professionals' about that placement and have been given their phD descriptions of why it shouldn't be in front of the water pump.

But I keep reading more often from those who put the check valve AFTER the water pump are reporting low water pressure issues.

Mine has been flowing perfectly since March, 2018 when I did the fix.
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Old 11-19-2018, 09:22 AM   #10
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Couple more things to add... Are you using a water pressure regulator?
High water pressure can overcome a perfectly good working check valve in the pump.

Also, make sure you don't have your 12v water pump switch on while using city water.
The pump, working against the city water pressure, can open the check valve as well.
No need for the pump to be on when using city water.
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