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Old 08-09-2015, 07:05 AM   #1
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Bathroom Sink Drain

Hiya! I'm in the final stages of renovating a 1994 Firan Raven RV.

My bathroom sink stopped draining last night.

We had just installed a new faucet in the kitchen and stopped all line leaks and got city water to pressurize in the lines.

While getting the air out of the bathroom faucet lines water filled the sink and then wouldn't drain anymore. Tried boiling water. Tried plunging it, but it's very clear it's something fully stopping any water from moving forward in just the bathroom sink/drain line.

We disconnected the pipes visible under the bath sink and they are super clean. This RV was barely used for the last 7 years and rarely used before that.

Kitchen and shower do not back up at all.

It "feels" like (while plunging) about three ft into the drain pipe, where that drain hose connects to the air/drain pipe, is stopped/flapped to the point that only the littlest bit of water leaves the sink while plunging. It doesn't feel like a clog of stuff/gunk.

Opening the gray does not help drain the bath sink either.

Gray tank was drained several times during the testing process yesterday and no other backups are happening.

Any next step thoughts?

Thank you so much for your minutes and help.

=)
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Hiya! I'm Lorelei and I'm renovating a 1994 Firan Raven for FT living. 24k Miles; Chevy P30 7.4L (Gas) engine. Renovation blog here: http://rvrenovation.wordpress.com
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Old 08-09-2015, 07:26 AM   #2
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Try running a drain snake down the roof vent to clear clog.

Good Luck.
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Old 08-09-2015, 07:28 AM   #3
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Water can't drain into the tank if air can't flow out of the tank. Check your vent pipes and "air admittance" valve.
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Old 08-09-2015, 07:45 AM   #4
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[QUOTE=OneSiren;2688181]Hiya! I'm in the final stages of renovating a 1994 Firan Raven RV.
My bathroom sink stopped draining last night.
While getting the air out of the bathroom faucet lines water filled the sink and then wouldn't drain anymore. Tried boiling water. Tried plunging it, but it's very clear it's something fully stopping any water from moving forward in just the bathroom sink/drain line.
Any next step thoughts?
Thank you so much for your minutes and help.
[QUOTE]
OneSiren
If you have an air admittance valve in the sink drain plumbing verify that it is working.
AND/OR
run a sewer snake down the pipe.


AIR ADMITTANCE VALVE



SEWER SNAKE

Mel
'96 Safrai
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Old 08-09-2015, 07:54 AM   #5
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I would say run a small plumbers snake thru that waist pipe, hair and old soap are really tough! Plunging only packs it!

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Old 08-09-2015, 10:44 AM   #6
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As usual you all are fantastic. Thank you for photos and your time!

I have one of those snakes.

That valve graphic is now saved to my collection and was perfect. It matches what I'm "feeling" when we plunged and so I stopped as I knew hair or a mouse or whatever can't make that good of a seal to prevent almost no drainage.

I'll be back! =)
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Old 08-09-2015, 10:58 PM   #7
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Snake worked! We believe there is an air vent inside the wall b/w bath and bedroom per iPhone videos taken in the hole under the cabinet.

The snake pulled nothing out of the line at all - no gunk, hair, nothing, but now it's draining like a champ!

Thank you!!
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Old 08-10-2015, 07:09 AM   #8
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Quote:
Originally Posted by OneSiren View Post
Snake worked! We believe there is an air vent inside the wall b/w bath and bedroom per iPhone videos taken in the hole under the cabinet.
The snake pulled nothing out of the line at all - no gunk, hair, nothing, but now it's draining like a champ!
Thank you!!
OneSiren
Thanks for the update.
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Old 08-11-2015, 09:49 PM   #9
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If you start getting oder's from the gray tank in the bathroom the air admittance valve may be stuck open.
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