Dishwasher high drain loop

[Pat5600]

I am still fighting sewer gas smell once in a while coming out of garbage disposal sink drain side. After a lot of troubleshooting, I seemed to have minimized the odor by disconnecting the dishwasher drain hose into the garbage disposal, plugged the GD hole with a wine cork??. Yes I have cleaned the dishwasher itself, drain filter, ran various cleaners thru multiple washes (vinegar, baking soda etc) So the question is the routing of the drain hose. #1 was how the builder installed the DW drain routing [knocked hole in cabinet wall at top] and utube and other video show it as #2. Both seem to be a good high loop? Question does it really matter on version 1 or 2.

 

[Reach4]

Any bad smell inside the dishwasher?

Did the smell occur when the dishwasher was connected, but you had not run the dishwasher in the last 24 hours?

One possibility is that the dishwasher discharges fast, and cuts off fast, having siphoned the p-trap. Maybe your p-trap venting is not quite right. How about a photo showing your trap, the output of the disposal, and where the drain enters the wall.

You could experiment by running some water from the kitchen faucet for a little while after the dishwasher discharges. This would be to refill the trap.

 

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[John Gayewski]

The top picture is gonna be better, the second picture is kind of bad depending on how much room you have in the cabinet.

Either way, the dishwasher drain shouldn't be causing sewer gas smell. A properly vented plumbing system should not allow sewer gas even without a high loop.

 

[Pat5600]

Thanks guys for the reply. The under sink plumbing has not changed in 20 years. This started maybe 3 months ago after I changed out the GD, same model etc. Just last week again, I disassembled the p-traps etc, they were clean and had water in them. I removed the GDisposal and took it to the garage sink, smelled it, ran water down thru the top and watched/smelled the water coming out the exhaust. Sewer gas for maybe 10 seconds and then it cleared up. Took the exhaust pipe off, cleaned the gasket and reassembled and reinstalled again. No, there is no sewer smell inside the DW or under the cabinet. I had a previous thread before about the AAV being changed out. The old one was quite a mess inside. Before I removed the DW drain hose, just running water would cause the smell. GD was not turned on. I thought perhaps the water was drawing air/smell from the DW or hose or there was food waste stuck within the GD. I have run ice cubes, orange peals etc. The smell returns shortly. Removing the hose did reduce it quite a bit but not eliminate it. I am thinking I should remove the dishwasher, change out the hose, inspect area behind the DW etc. Thanks again. Pat. Picture will follow up shortly