DEF tank capacity
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Cross-Country
Joined: Oct 2016
Posts: 90
Likes: 2
DEF tank capacity
I towed the MS Atlanta to the New Mexico mountains and back to DFW area with my F450 for a total of about 1500 miles including lots of day trips without the trailer. Upon returning to the DFW area, I started getting the "refill DEF tank message". I think it started with a number of about 500 miles to empty.
Anyways, I noticed on the gauge that it was about 1/4 full at that point. Having come from a Ram 3500, I was used to purchasing a 2.5 gallon SuperTech DEF container at Walmart and pouring that in. That amount usually filled me up. Today when I did that, I noticed that my gauge only went from about 1/4 full to about 5/8 full. I am guessing that it is a bigger tank than the Ram so I probably need to pick up another 2.5 gallons of DEF tomorrow.
I am LOVING this 450!!
Joe
Anyways, I noticed on the gauge that it was about 1/4 full at that point. Having come from a Ram 3500, I was used to purchasing a 2.5 gallon SuperTech DEF container at Walmart and pouring that in. That amount usually filled me up. Today when I did that, I noticed that my gauge only went from about 1/4 full to about 5/8 full. I am guessing that it is a bigger tank than the Ram so I probably need to pick up another 2.5 gallons of DEF tomorrow.
I am LOVING this 450!!
Joe
Cargo Master
Joined: Oct 2015
Posts: 2,745
Likes: 72
From: West Virginia
I find it perplexing that DEF comes in 2.5 gallon jugs and the tank is 7.5 gallons (which works out to three jugs of DEF from empty) but the gauge is marked in 1/4 tank increments. 
When I look at the gauge I ignore the markings and mentally divide it into thirds which is a much more convenient way to track how much I have or need.
When I look at the gauge I ignore the markings and mentally divide it into thirds which is a much more convenient way to track how much I have or need.
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Posting Guru
Joined: Jun 2018
Posts: 1,366
Likes: 186
From: Frederick, CO
The 7.5 gallon tank is brilliant. Just wait until the warning comes on and it easily takes 5 gallons (2 x 2.5). No need to meter it out or to use the various filling lines that prevent spillage. Easy peasy. Done.
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Senior User
Joined: Mar 2019
Posts: 486
Likes: 8
From: Salt Lake City
Exactly what homerj said. 2 - 2.5 Gallon Boxes fills up the tank when you are at 1/4 tank.
Tuned
Joined: Apr 2018
Posts: 454
Likes: 25
Most truck stops have a DEF pump, if its convenient for ya. Half my gas stations here have them. Much much easier if you can pin one down, especially since you rarely need DEF.
Also, I've had my truck now for 24k miles (30K total) and I've only filled the DEF three times. Third time being just a few weeks ago, and I'm still at full.
Also, I've had my truck now for 24k miles (30K total) and I've only filled the DEF three times. Third time being just a few weeks ago, and I'm still at full.
More Turbo
Joined: Sep 2016
Posts: 618
Likes: 6
Most truck stops have a DEF pump, if its convenient for ya. Half my gas stations here have them. Much much easier if you can pin one down, especially since you rarely need DEF.
Also, I've had my truck now for 24k miles (30K total) and I've only filled the DEF three times. Third time being just a few weeks ago, and I'm still at full.
Also, I've had my truck now for 24k miles (30K total) and I've only filled the DEF three times. Third time being just a few weeks ago, and I'm still at full.
Tuned
Joined: Apr 2018
Posts: 454
Likes: 25
Haha, yeah I have alot of highway drives on her. Probably only 3-4000 miles worth of towing at the moment.