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Old 03-29-2017, 11:58 PM   #1
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Brand: Thor Motor Coach
Model: Four Winds 33SW
State: Idaho
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Checking the DEF level

Hello Thor Owners!

I have a 2016 Thor Four Winds 33SW Super C motorhome on the Ford F-550 chassis. I have not been able to locate the DEF level indication system, if there is one. I have also been very frustrated when trying to fill the DEF tank at the truck stops.

Any help would be greatly appreciated.

Thank you,

Marshall Poe
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Old 03-30-2017, 02:21 AM   #2
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Model: Gemini 24TX (2017)
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Ours only displays a message when the level is low, no ongoing display that I know of on our Mercedes Sprinter chassis. Don't know if Ford does or not. We were advised to refill DEF every 7th tank of fuel. I was also told that once that DEF warning message comes on, you can continue to drive for quite a few more miles, before it runs out.
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Old 08-17-2017, 03:31 AM   #3
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Update

Quote:
Originally Posted by IdahoPoes View Post
Hello Thor Owners!

I have a 2016 Thor Four Winds 33SW Super C motorhome on the Ford F-550 chassis. I have not been able to locate the DEF level indication system, if there is one. I have also been very frustrated when trying to fill the DEF tank at the truck stops.

Any help would be greatly appreciated.

Thank you,

Marshall Poe
Well, the DEF tank fill issue was solved by ordering the 21GU Mis-Filling Prevention Device (MFPD) (see picture). It contains the magnets necessary to allow you to fill the DEF tank at the DEF pump at any truck stop.
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Old 08-17-2017, 03:49 AM   #4
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State: Arizona
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I have the same issue on my Class C chateau. It will not fill properly and shuts the pump off every two seconds. Takes me forever to fill it. Is this the problem on a gas engine? Dealer told me pipe was crushed and they fixed it but said it was a Chevy problem and not a Thor problem
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Old 08-17-2017, 03:51 AM   #5
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Quote:
Originally Posted by glamperjan View Post
I have the same issue on my Class C chateau. It will not fill properly and shuts the pump off every two seconds. Takes me forever to fill it. Is this the problem on a gas engine? Dealer told me pipe was crushed and they fixed it but said it was a Chevy problem and not a Thor problem
It may be. This device tells the pump to lower the fill rate for non-semi truck tanks. I know this fixes the DEF fill issue.

Marshall
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Old 08-17-2017, 04:41 AM   #6
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Does this part just snap in over the existing gas Inlet?
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Old 08-17-2017, 04:42 AM   #7
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Mine is gas engine not diesel. Does this device work the same for both?
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Old 08-17-2017, 04:43 AM   #8
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This feeling problem happens at all gas stations not just truck stops
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Old 08-17-2017, 12:07 PM   #9
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Model: ACE 27.1
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Quote:
Originally Posted by glamperjan View Post
Does this part just snap in over the existing gas Inlet?
No, this has nothing to do with filling a gas tank. This device is for the Diesel Exhaust Fluid (DEF) tank fill.

Comments/questions about filling a gas tank are in a different thread.

Gas pump nozzle clicking off
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Old 08-17-2017, 08:32 PM   #10
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Originally Posted by Tfryman View Post
No, this has nothing to do with filling a gas tank. This device is for the Diesel Exhaust Fluid (DEF) tank fill.

Comments/questions about filling a gas tank are in a different thread.

Gas pump nozzle clicking off
Ok thx
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Old 01-31-2018, 07:49 AM   #11
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Hey... I have a 2017 Thor Diesel... can anyone tell me when it is ok to add DEF? Can it be topped off or should I wait for a low level indicator? Also... is there a difference in Ultra low sulfur fuel? And Diesel 2?
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Old 01-31-2018, 02:10 PM   #12
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WTH is DEF?
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Old 01-31-2018, 03:25 PM   #13
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Quote:
Originally Posted by jb1911 View Post
WTH is DEF?


Diesel Exaust Fluid
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Old 01-31-2018, 03:29 PM   #14
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Quote:
Originally Posted by jb1911 View Post
WTH is DEF?
More details: https://en.wikipedia.org/wiki/Diesel_exhaust_fluid
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Old 01-31-2018, 05:46 PM   #15
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DEF = Diesel exhaust fluid, (Diesel exhaust fluid is an aqueous urea solution made with 32.5% urea and 67.5% deionized water) necessary for any diesel made 2010 or later. We have the Mercedes chassis on which the Gemini is built, uses DEF, but not that much, at least when underway. If you are in stop and go traffic, or idle a lot DEF consumption will skyrocket. DEF can be added anytime, most vehicles do have some sort of display. On mine, one of the buttons near speedometer, shifts the fuel level display to DEF level display.
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Old 01-31-2018, 09:41 PM   #16
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Thank you Laco for your response and explanation. I am only 2 weeks old with my Gemini... could you tell me the absolute need for Ultra low sulfur fuel vs Diesel 2? This Ultra low seems a little harder to find on a normal
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Old 01-31-2018, 10:27 PM   #17
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Model: challenger 37YT
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Quote:
Originally Posted by LAdriver View Post
Hey... I have a 2017 Thor Diesel... can anyone tell me when it is ok to add DEF? Can it be topped off or should I wait for a low level indicator? Also... is there a difference in Ultra low sulfur fuel? And Diesel 2?


I bought a CTS monitor that plugs into the OBD port in my pickup, it reads all the values that the dash doesnít include, even had a little red light that glows when itís regenerating. It tells you the load on the exhaust ( the higher the percentage of load, the closer to regen) and it tells you the DEF level in your tank.
It also gives to exhaust temps so you know when it safe to shut down your engine.
Iíve had this monitor in my last few pickups.
Will be putting one one my Challenger even though itís a gasser. I just like more info on what the motor is doing.
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Old 01-31-2018, 10:30 PM   #18
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http://m.thoroughbreddiesel.com/stor...-Shipping.aspx

This is where I got mine.
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Old 01-31-2018, 10:33 PM   #19
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Thank you Rick... I will definitely look into this CTS monitor... and thank you for responding also
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Old 01-31-2018, 11:14 PM   #20
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Quote:
Originally Posted by LAdriver View Post
Thank you Laco for your response and explanation. I am only 2 weeks old with my Gemini... could you tell me the absolute need for Ultra low sulfur fuel vs Diesel 2? This Ultra low seems a little harder to find on a normal
ULS diesel is pretty much all that has been available since 2010. No. 2 diesel dispensed today would be ULSD, as required by law. For some reason California does not require the label at diesel pumps to say ULSD, but it is required to be ULSD.
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