|Topic Review (Newest First)|
|08-22-2019 01:33 PM|
|slayerfish||My truck uses much more DEF when towing. 'Specially in the mountains.|
|08-22-2019 01:22 PM|
Originally Posted by kthaxton View Post
RAM should have since they are using a non-traditional fluid level detector, either included a paragraph in the owners' manual that says something like the gauge indicates full and only starts to track when the fluid level once it falls to 2 1/2 gallons or used a different notification on the cluster. I guess one could argue no one reads the owners' manual but there are exceptions.
|08-22-2019 10:57 AM|
This explains how the gauge works and why it is not linear.
|08-22-2019 08:37 AM|
|boshog||When my DEF gauge needle touches the red, I add 2 1/2 gallons which pushes the gauge to full. I don't think the gauge is accurate or linear.|
|08-21-2019 09:34 AM|
The gauge works a lot like most fuel gauges work, too. Stays on Full for a lot longer than when the tank is actually full. Goes down a lot faster once it gets below half.
I run mine down until the warning messages actually come on the EVIC. There is a truck stop 15 minutes way that has DEF at the pump; works great to fill up exactly to the top, no need to store DEF that will eventually go bad.
If you do use old / expired / bad DEF, your truck will know, display error messages, and trip fault codes.
|08-21-2019 08:21 AM|
|Learjet||if you wait until the gauge gets down to 1/2...you can dump 2.5 gallons in.|
|08-20-2019 10:51 PM|
Originally Posted by Learjet View Post
|08-20-2019 09:50 PM|
please watch this informative video on how your DEF gauge works
|08-20-2019 09:11 PM|
Originally Posted by Jeremyw81 View Post
|08-20-2019 08:03 PM|
Thanks for all your tips. Yes, I will wait until it's at half or less next time and not even worry about the extra 2 or so gallons. I'm in FL so that'll suck if the fluid goes bad from the heat.
I pull a 5th wheel every other month, does def fluid burn faster when towing heavy loads? About 13k lbs
|08-20-2019 07:19 PM|
|bigblue11||I usually just had 2.5 gallons at a time. That will have my gauge show full when I fill it up when it hits the red. I don’t go through enough to dump 5 gallons in.|
|08-20-2019 05:21 PM|
|6401nohl||DEF tank is 5.5 gal. When close to "full", I've gone upwards of 3k miles before the gauge even moves. I've added a 2.5 gal jug when it was showing around 3/4 full without it sounding like it was topped off. Perhaps it was a case like Lins stated in post #2.|
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