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Need plumbing advice, please? [message #328427] Sun, 21 January 2018 08:09 Go to previous message
GMC Jimmy is currently offline  GMC Jimmy   Canada
Messages: 199
Registered: September 2016
Location: Niagara, Ontario
Karma:
Senior Member
Hello All, I hope everyone is enjoying this winter, it has been quite cold and snowy in most parts of North America... Ontario included.

1975 26' Coachmen built Royale with dry bath.

I'm working away on getting the GMC ready for the spring and was hoping to address an issue I noticed last autumn. While running the water in the front lounge sink (just happened to be this sink but it happens with the bathroom sink as well), after a couple of minutes I notice the water rises up from the shower drain and into the shower.

While trying to diagnose why this is happening, and I'm no plumber, you could hear some gurgling sounds as the water builds up into the shower.

Looking over the existing plumbing to determine drains and vents etc it appeared there isn't a direct drain vent, at least one that we could identify.

We tried snaking out lines, both drain and vent to try and clear any obstructions or clogs, did the best we could and because testing afterwards yielded the same result we looked at installing a new vent line. There is a vent line in the bathroom that ties the main drain line into a vent pipe but we thought it might fix the issue by adding another vent a bit further downstream towards the rear of the coach... no luck.

Here is a photo with a little description... http://www.gmcmhphotos.com/photos/my-75-royale/p64479-image350.html

A = the existing drain line from the front lounge sink past the bathroom which disappears into the floor next to the generator enclosure, assuming this goes to the grey tank?

B = the newly added vent line connecting the main drain to what I believe is the black tank vent.

C = the existing vent line from black tank up through the roof via the bathroom.

What am I missing here, the only other possibility I can think of is that there should be another vent somewhere direct from the grey tank to the atmosphere? If this is the case where should I be looking because I haven't seen one yet?

Or should I be chasing an obstruction somewhere?

As always your guidance is appreciated,
Regards,
Mike

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