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Old 12-07-2014, 06:48 PM   #11
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This might be a longshot, but is the propane tank you are using getting low on fuel? Sometimes a nearly empty tank will give off an odor from the ethyl mercapan (the odorant added to propane so you can smell it if you have a leak). It doesn't seem to burn along with the propane and can accumulate in the bottom of the tank.

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Old 12-07-2014, 11:16 PM   #12
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We used to get this a lot from the hot water heater. Happened in several trailers after winterizing and sometimes after they would sit awhile with water in the system (we full time now so the water never sits). What I would do is dump one gallon of bleach into the fresh water tank and fill it. Our fresh water tanks were always around 30 gallons, so this gave the 30:1 ratio for sanitizing. Then, we just used the camper for a weekend and the smell always went away. Dishes seemed a little cleaner too . I have also done this more quickly by running the 30:1 solution through using the water pump by opening all the hot and cold faucets. The first way seemed to work a little better, but the second would do in a pinch.

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Old 12-08-2014, 08:03 AM   #13
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To summarize, you have a variety of things to check:

Battery - possible, but honestly highly unlikely, especially with a new unit. As poster said, easy to check!

Water heater - depending on your model, if it has an anode, that could be defective and causing the smell. Cheap/easy replacement. Many models don't have this, and it is pretty unlikely in a new model.

Water heater - sulphur bacteria growing in the heater. Hence the instructions for bleaching your water supply. Pretty common problem in some areas of the country. Posts on other forums seem to implicate untreated well water as the cause. High possibility.

Water system - same as water heater. Again, bleaching is the answer.

Drains - less likely, but your old friend bleach will take care of what is in the traps.

Grey tank - same as the drains. Again very less likely, as most odors are prevented from escaping via traps (which is what traps are for). Bleach from doing the drains should fix it.

Finally, just the water itself. Drain system and rinse....
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Old 12-08-2014, 11:16 AM   #14
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This has happened to us twice from the gray tank primarily after a long sit. We made sure all traps were filled with water and eventually (within a day) the smell was gone. Now, before we leave, I flush the gray tank.
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Old 12-08-2014, 12:54 PM   #15
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Originally Posted by Msullivan32 View Post
Can you run the bleach water through the hot water heater?
Yes... This is most likely what it is. Bacteria from the water sitting unused in your water heater over the course of camping season. Easiest way to deal with it is to make a mixture of water and bleach (search for the correct ratio... something like 25 to 1) and put it in a large bucket and use the hose you use to winterize your camper.

Once you have water pressure (make sure you do NOT have the water heater bypassed for this), open your hot water line. This will draw the bleach mixture into the water heater. You will need at least 6.5 gallons of bleach solution for a typical 6 gallon water heater. I'd suggest a little more and run the hot water lines in the sinks and bathtub so you kill any residual bacteria in those lines. Let it sit for 24 hours, it should kill the bacteria.

You can just drain your water heater or open your low point drains and all your faucets to get the bleach water out.

Been there... done that. Now I make sure to drain my low points after EVERY SINGLE TRIP.
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Old 12-08-2014, 01:11 PM   #16
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Originally Posted by Camping Couple View Post
... After some more searching, it could have been the plumbing vent under the sink also?...
I second this possibility. The gray-line vent under the bath sink might be stuck open, allowing gases to enter the TT. Snif it to see, or rubber-band a plastic band over it for a while to see if the odor dissipates.

If it's your sink drain traps, it's easy (but a nasty job) to remove them and clean out the accumulated gunk- just place a drain pan underneath when removing them. I think that is more effective than bleaching them, since you're removing all the "food" for the bacteria.

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