DEF gauge

[Phantom 4D]

Anyone having issues with the DEF gauge? 

Mine was down to three bars. I filled per the manual which brought it up to full. I did a 1000 mile round trip, then driving it around town. It was down two bars after the trip.

I've driven a at least 1000 more or les since the trip. It's still at two bars. I really don't know if I trust it. But don't want to go into limp mode on the road. 

 

[redwngr]

Gauge can be misleading, for sure. 

DEF is used as a ratio of the fuel burned -- should be about 2%  - so about 2 gallons of DEF for every 100 gallons of fuel.

 

My first DEF truck, was a 2011.   2011's didn't have a gauge at all -- just the 1000 mile to empty and 300 miles to empty warnings.

 

Anyway --  when they do get to empty they then start a 500 miles to speed limit countdown which gives lots of time to get def.  Most are going to need fuel within 500 miles anyway, and if diesel is available DEF will be available too. 

 

I've intentionally taken my L5P and LM2 trucks to 'empty' just to see how the messages work.

Yes, I wasn't far from home/rescue if things went south. 

 

Haven't been able to make that happen (yet) with this LZO --  but I have got it close, and I fill at a commercial, metered, bulk location so I can get a better handle on how much DEF it is using. 

 

Truck is running better than 29 mpg lifetime, and I've added def about every 7000 miles. 

 

 

 

Lifetime fuel was running 29.6 when the last def fill was done

 

29.6 / 1379 x 100% = 2.1% 

 

Last fill, only the last partial segment was still 'on'.

 

 

 

[Phantom 4D]

On 9/10/2024 at 6:17 PM, redwngr said:

Gauge can be misleading, for sure. 

DEF is used as a ratio of the fuel burned -- should be about 2%  - so about 2 gallons of DEF for every 100 gallons of fuel.

 

My first DEF truck, was a 2011.   2011's didn't have a gauge at all -- just the 1000 mile to empty and 300 miles to empty warnings.

 

Anyway --  when they do get to empty they then start a 500 miles to speed limit countdown which gives lots of time to get def.  Most are going to need fuel within 500 miles anyway, and if diesel is available DEF will be available too. 

 

I've intentionally taken my L5P and LM2 trucks to 'empty' just to see how the messages work.

Yes, I wasn't far from home/rescue if things went south. 

 

Haven't been able to make that happen (yet) with this LZO --  but I have got it close, and I fill at a commercial, metered, bulk location so I can get a better handle on how much DEF it is using. 

 

Truck is running better than 29 mpg lifetime, and I've added def about every 7000 miles. 

 

 

 

Lifetime fuel was running 29.6 when the last def fill was done

 

29.6 / 1379 x 100% = 2.1% 

 

Last fill, only the last partial segment was still 'on'.

 

 

 

Thanks for the info. I'll keep an eye on it. When I got the truck last year, the salesman and service manager said DEF should last until oil change. That didn't work out. I never listen to what they say anyway.