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Thread: DEF fluid gauge accuracy Reply to Thread
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  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
boshog
Quote:
Originally Posted by kthaxton View Post
This explains how the gauge works and why it is not linear.
Wow, that explains it. Thanks for posting the link.

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
kthaxton 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
troverman 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
hooked55
Quote:
Originally Posted by Learjet View Post
please watch this informative video on how your DEF gauge works

https://youtu.be/czJZuc8ThhI
Thank you Learjet, that explains it clearly. So we have approx. 3.5 gals when the gauge starts to move off of full. Good for about 3500 miles if we get 1000mpg as the video says. Ballpark range is 5500 miles per full tank of def. great information.....
08-20-2019 09:50 PM
Learjet please watch this informative video on how your DEF gauge works

https://youtu.be/czJZuc8ThhI
08-20-2019 09:11 PM
hooked55
Quote:
Originally Posted by Jeremyw81 View Post
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
Yes it uses more def when towing, but not a huge difference. Have also heard others say if the def is weaker due to heat or age it will use more also. Some of us that donít put many miles on need the Chemists to come up with DEF stabilizer like what Stabil does for gasoline. Maybe it already exists, anybody?
08-20-2019 08:03 PM
Jeremyw81 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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