Shower Drain

Wondering if anyone else has this issue:

When using the shower and the kitchen sink, the shower it seems like the pressure in the holding tank builds up preventing the shower to drain. Then all off a sudden the air pressure releases through the shower drain in a big burst air. It isnt just a few bubbles of air it is burst of air which of course spashes the shower water all over. Then it drains no problem.

The tank is was just barely 2/3 full and it has happened twice, both times when using the kitchen sink, possibly just luck it happened that way.

Clearly the tank is not venting correctly in this senario. The vent doesnt seem to be blocked though because i have noticed bubblle from dish soap foam out the opening when washing a lot of dishes.

Seems strange, any ideas what to check or look into before I tear into it?

[ShrimpBurrito]

The kitchen sink vent is outside the TM, directly on the other of the wall as the sink. It's covered by a white louvered piece of plastic.

The tub does not vent there. The tub vent, IIRC, is behind the converter. It would be worth 5 min to slide the converter out and take a look. It's only held in by 4 phillips screws, and there should be enough slack in the wiring to pull it out far enough to look in that cavity.

Dave

thanks dave. so the tub doesnt vent to the outside?

[ShrimpBurrito]

If what I saw behind the converter was actually the tub vent (and I am nearly certain it was), then no, it does not vent directly to the outside. However, it does vent to the area under the tub, where there is also a screen opening to the underside of the trailer. This screen opening, maybe 3-4" in diameter, is where the bathroom fan vents to, although there is no duct or hose directing the air to that opening. The fan simply vents to the area under the tub, just like the tub vent, where theoretically the air eventually finds its way out through the screen opening.

Dave