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Old 09-27-2012, 08:43 AM   #11
B47
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Tater and BF47

Mine does not go above the full line but more of a concern ... Why would the two of you fill up without filling your DEF tank. I get very nervous when my DEF guage gets down to one bar. I have been told that if you ever run dry on DEF the engine stops ... no matter how much fuel you have in the tank.

I always keep a couple of gallons spare in my storage compartment as a safety measure
Well in my case, my 2012 Ram 6.7L Cummins diesel does not use or require DEF and Tater never specified DEF so I assume he/she was speaking of the gasoline guage reading only.
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Old 09-27-2012, 04:30 PM   #12
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This is exactly what my fuel guage has started to do. Also, if it's the same problem I have, when you first turn your key on and all the guages reset themselves or bottom out, the fuel guage does not reset to the "E" mark, but only makes it to the 3/16 mark. (between 1/8 (orange) and the 1/4 tank mark).

I had my rig into Freightliner to fix. They replaced the fuel sensor in the tank and that still did not fix the problem. They are going to try replacing the guage itself next time around.

The 'low fuel' light on the dash still works correctly. Comes on when there is actually 1/8 of a tank left. But the fuel guage is off by about 3/16 of a tank. When it reaches 1/2 full, I know I have about 1/4 of a tank left.
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Old 09-27-2012, 04:56 PM   #13
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I never go below 1/4 of a tank as the generator will not run. At 1/4 it takes 70 gals of diesel.
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Old 10-01-2012, 11:31 AM   #14
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Also have a 2011 390BH. Gas gage does stop at "F", and does not go over. I also have a DEF system. I have been done to yellow once on the gage and was concerned what happen when it went to red. Was told at Freightliner Camp that when it went to red, as long as you did not turn the engine off, your could keep going for about 200 more miles. Also told that if you did stop the engine, you would need to be towed. Never found out, if it went to red, did you need to fill the DEF tank while the unit was still running. Figured I didn't need that information as DW would not let me get it down to red. ;-)
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Old 10-01-2012, 02:35 PM   #15
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Superchief

I have heard the same thing regarding DEF.

I was interested to hear you say that you have a 2011 with DEF since I had spoken to an other 2012 Berk owner with 6.7 ISB who claims that their unit does not require DEF ... even though his fuel guage has the DEF lights down below.

It was my understanding that all new diesel engine require DEF as some sort of new emmision regulation.
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Old 10-01-2012, 02:48 PM   #16
2011 Berkshire 390BH
 
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That would surprise me. I know some who have 2011 units, but built on 2010 Freightliner Frames, that do not have DEF. Have not heard of 2012 units without DEF. They might be in for a surprise when the red light comes on!
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Old 10-01-2012, 02:55 PM   #17
B47
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Quote:
Originally Posted by lefaivre View Post
Superchief

I have heard the same thing regarding DEF.

I was interested to hear you say that you have a 2011 with DEF since I had spoken to an other 2012 Berk owner with 6.7 ISB who claims that their unit does not require DEF ... even though his fuel guage has the DEF lights down below.

It was my understanding that all new diesel engine require DEF as some sort of new emmision regulation.
I can't speak for "all new diesel engines requires DEF...", but my 2012 Ram 2500 3/4 ton pick up with the Cummins 6.7 L diesel engine does not require DEF.

I do believe the Ram 3500 diesels do require DEF.
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Old 10-16-2012, 03:18 PM   #18
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Same problem

Having the same prob with my 2012 390bh... worked fine for the first 2 fill ups. Now its over by at least a quarter and when it says 1/4 tank its nearly empty.....basically 1/4 - 0 gallons, 1/2 = 25, 3/4=50, F=75..... if you here of a fix let me know...
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Old 10-18-2012, 09:39 PM   #19
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Just filled up my 2010 and the needle landed right on "F", and my wallet was right on "E". Taking it to College Station Texas for the A&M, LSU game!
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Old 10-18-2012, 09:42 PM   #20
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set the trip meter each time and see how many gallons you use for a given fill up vs miles keeping in mind you know how many gallons the tank is.

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