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Old 08-25-2010, 03:53 PM   #1
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Stuck grey tank sensor

For the last few months my 1/3 full sensor on my grey tank has been stuck -- glows "on" whenever I hit the monitor. Before our last trip I put in a gal. of water with Calgon and detergent for a traveling slosh-wash on the way. While camping we mostly filled the tank, mainly dish and was water, and had to drive some miles on the way home before dumping. No luck -- it's still stuck. In looking under the trailer it appears that access to the sensors is up the drain pipe. I'm thinking a tank wand that shoots sideways up the drain pipe could blast it clean. But before I do, I thought I'd check in and seek advice; I don't want to inadvertently destroy the sensor trying to clean the schmutz off of it. Anyone know what the sensor looks like, and/or how sensitive it would be to a pressure blast?

Thanks in advance,
Bruce
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Old 08-25-2010, 04:32 PM   #2
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Re: Stuck grey tank sensor

Thats exactly what we have donewith ours a few times...one of those RV wands--Reace put a couple screws in the end of it so it really "flushed" towards the sensors.
Doug cleaned the tank out really well after our last trip and quite a lot of greyish soap sludge came out..
Sensors all read empty now...
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Old 08-25-2010, 05:17 PM   #3
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Re: Stuck grey tank sensor

Reace adapted my wand as well, but he didn't put screws in it. He drilled a couple more holes at a 45 degree angle so that water shoots upward as well as out the sides.

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Old 08-25-2010, 05:54 PM   #4
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Re: Stuck grey tank sensor

Hmmmmm....I just noticed ours was stuck on 1/3 or 1/4th ?? on our last outing. Where are you sticking the flush out wand? Know where it goes for the black tank (if needed), but not the grey? Should be some "soap scum de-mucker" somewhere to swish around in there.
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Old 08-25-2010, 06:20 PM   #5
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Re: Stuck grey tank sensor

Some folks swear that adding bags of ice and then driving around cleans tanks out exceptionally well. I've never tried it so I cannot verify that it does.
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Old 08-25-2010, 07:24 PM   #6
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Re: Stuck grey tank sensor

Yeppers, the wand works great for cleaning the sensor.

As a bit of a side note, due to the low mounting height of the grey tank, it really drains slow on our 19, as the drain pipe is almost level. What we do when we pull up to a dumping station is to put a bunch of blocks under the opposite side wheels. This really helps speed up the draining and completely empties it.
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Old 08-25-2010, 09:56 PM   #7
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Re: Stuck grey tank sensor

Eric

I tried a bag of ice in the black water tank. Added a small bag through the toilet about half way home. I was surprised how much came out when we got home. Either I did not drain it well at the campground or the ice losened things up.

How would you add ice to the gray water tank? Where are you putting the wand into to wash it out?

Jim

Interesting recommendation on getting it to drain faster. I can't help but think there might be times you do not drain it completely because of a minor slope on the ground around the drain.


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Old 08-26-2010, 09:31 AM   #8
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Re: Stuck grey tank sensor

Quote:
Originally Posted by fudge_brownie
Eric

How would you add ice to the gray water tank?
Paul - I think it is called typing before thinking on my part. I have no idea how you would get ice in the grey water tank in large enough quantity. I was thinking black water..... Can I blame it on age?
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Old 08-26-2010, 12:47 PM   #9
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Re: Stuck grey tank sensor

Hokie-

As far as getting to the grey tank sensors goes, looks to me like it's a matter of popping the waste tanks' drain cap, opening the grey waste gate valve, sticking the wand up the grey waste pipe and shooting a cleaning stream sideways onto the sensors, which are right next to the drain pipe junction with the grey tank. Betcha they are right there for that reason. All this is predicated on your 5.0 being built like my 19, of course.

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Old 08-26-2010, 05:14 PM   #10
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Re: Stuck grey tank sensor

Eric

Maybe we can use Bruce's method and blow ice into the gray tank. How about a pressurized reverse stinky slinky?

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