DEF tank - Dodge Cummins Diesel Forum
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post #1 of 10 (permalink) Old 04-15-2019, 01:43 PM Thread Starter
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DEF tank

I bought my 2017 2500 in late January (14k original miles) driving it up from North Carolina to NY. It started with a full DEF tank per the gauge. At 15,200 I was at 1/2 full and bought some WalMart DEF and dumped the whole 2 1/2 gal. in (gauge showed full,100%). I have since put another 800 miles on her but the gauge hasn't budged..Is this normal? Mostly short city driving...I'm a bit nervous as I have a long distance trip planned with my daughter and don't need any probs along the way that could be avoided..
Thanks for any input...


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post #2 of 10 (permalink) Old 04-15-2019, 01:45 PM
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Normal. The gauge is far from linear.

.
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post #3 of 10 (permalink) Old 04-15-2019, 01:58 PM
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Really depends on type of driving, i.e., hauling and towing, highway versus city. Mine uses the most when towing or hauling loads. I drove 600 miles this past weekend, towing a 98 Dodge Ram pickup on a 20' trailer,went from close to full to a quarter in 900 miles, 2.5 gals of DEF filled it back up. When daily driver back and forth to work, probably go 2k miles before hit drops quarter of a tank.

Your experience sounds normal. If concerned, just take a 2.5 gal jug with you, for peace of mind.
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post #4 of 10 (permalink) Old 04-15-2019, 02:08 PM
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Normal gauge reads full long before the tank is truly full. Part of that is because def will freeze up north and they leave some room for it. I usually let mine go to the red and then fill up then puts it right around full even then.
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post #5 of 10 (permalink) Old 04-15-2019, 02:20 PM
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Originally Posted by LI Guy View Post
I bought my 2017 2500 in late January (14k original miles) driving it up from North Carolina to NY. It started with a full DEF tank per the gauge. At 15,200 I was at 1/2 full and bought some WalMart DEF and dumped the whole 2 1/2 gal. in (gauge showed full,100%). I have since put another 800 miles on her but the gauge hasn't budged..Is this normal? Mostly short city driving...I'm a bit nervous as I have a long distance trip planned with my daughter and don't need any probs along the way that could be avoided..
Thanks for any input...
There is almost two gallons of tank capacity above where the gauge reads 100%, so running light, you can go a very long way before the needle will start to drop.

But, why would you be nervous of a long trip due to DEF usage?

DEF is available in thousands of locations throughout the country, at just about any walmart, auto parts store, and at almost all truck stops either in jugs or at the fuel island bulk pumps. Absolutely no need to be nervous about finding DEF, no matter where you are, or where you're going.

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post #6 of 10 (permalink) Old 04-15-2019, 02:27 PM
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The tank will hold about 2+ gallons above the full mark on the gauge. I wait till mine get into the red and then out in a 2.5 gallon jug and that takes it back to 100%. I am sure that is a little over 100% as it takes a while to start dropping. I use to fill the tank and it would take a long time to start goind down, then through a code, I assume because the DEF was in the tank too long in the extreme heat hear. So now I never add too much def so it turns over a little more often.
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post #7 of 10 (permalink) Old 04-15-2019, 02:30 PM Thread Starter
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Originally Posted by Ltngdrvr View Post
There is almost two gallons of tank capacity above where the gauge reads 100%, so running light, you can go a very long way before the needle will start to drop.

But, why would you be nervous of a long trip due to DEF usage?

DEF is available in thousands of locations throughout the country, at just about any walmart, auto parts store, and at almost all truck stops either in jugs or at the fuel island bulk pumps. Absolutely no need to be nervous about finding DEF, no matter where you are, or where you're going.
It was more for the correct amount of usage. Wasn't sure if there was a possible clog in the system or some such thing..First diesel ,so just being over cautious especially going away from home with it. Thanks for your reply...

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post #8 of 10 (permalink) Old 04-15-2019, 02:46 PM
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It was more for the correct amount of usage. Wasn't sure if there was a possible clog in the system or some such thing..First diesel ,so just being over cautious especially going away from home with it. Thanks for your reply...
If there's something wrong, the truck will let you know. Don't worry about it.
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post #9 of 10 (permalink) Old 04-15-2019, 02:58 PM
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I just went over 2,000 miles before the gauge came off the full mark.

please watch this video https://youtu.be/czJZuc8ThhI

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post #10 of 10 (permalink) Old 04-15-2019, 03:55 PM
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I only refill with the small jugs if I'm not taking a trip. The heat here can kill the DEF in the summers easy.
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