Partially emptied the black tank as the receiving facility was full. Buttoned up the line and closed all valves and drove 1/2 mile and black tank fumes started coming into the m/h maybe around the washing machine area. ?When we Stopped the smell stopped. But as soon as we moved the next day. They came back. What is the problem?Where could it be coming from and how to fix it. Stinky.

May not be the blank tank. I suspect you're smelling the gray tank which can be as bad as the black tank. Be sure all of the traps have water in them ....including the washer drain. If this does not help, then start replacing the air admittance valves under the sinks ($5.00 approx at Home Depot).I don't have a washer, so I've taped over the drain line so I don't have to worry about the trap losing water.Also be sure you don't have a stove burner slightly turned on as propane can smell bad also.Outgassing on a bad battery can be bad also.Good luck.Fred

What do you mean the receiving facility was full? Huh? Once you start to dump you don't stop until your finished dumping. How did you stop dumping?

Sometimes you'll get smells back into the coach if you're "P" traps are not full of water and other times just because of the movement of air around the toilet vent. If you determine it is, in fact, odors coming from the roof vent, you could install one of the Cyclone Vent covers that prevent the odors from reentering the coach. Below is a link to these covers, on sale at Camping World.....DennisCyclone Vent Covers

Thanks. The only possible trap w no water could be the washer/dryer. We were not able to turn it on for some reason so unable to restore water to that trap , if it has one. It only smells when moving. We thought the toilet vent was reentering the coach by way of the roof vent but NOT the case.

fltrker wrote:Partially emptied the black tank as the receiving facility was full. I wouldn't care how long the line was. I'm sure they would understand an extra 2 minutes to completely empty the black tank. Having said that, I'd be very careful the next time you pull that sewer cap off. Even though you closed all the valves, you may have closed the black valve on a wad of TP so it didn't close completely and is leaking black water into your sewer line.

Black tank fumes | Good Sam Community

cpmath
Explorer
Jun 24, 2013
What do you mean the receiving facility was full? Huh? Once you start to dump you don't stop until your finished dumping. How did you stop dumping?
fcooper
Explorer
Jun 23, 2013
May not be the blank tank. I suspect you're smelling the gray tank which can be as bad as the black tank. Be sure all of the traps have water in them ....including the washer drain. If this does not help, then start replacing the air admittance valves under the sinks ($5.00 approx at Home Depot).

I don't have a washer, so I've taped over the drain line so I don't have to worry about the trap losing water.

Also be sure you don't have a stove burner slightly turned on as propane can smell bad also.

Outgassing on a bad battery can be bad also.

Good luck.

Fred

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