2017 GMC/Chevy DEF tank!

You should get your truck and your dryer fixed (if a gas dryer) ;).

Yes DPF diesels no longer smell like the diesels of old but they sure as heck do not smell like air nor does your dryer! Both will kill you if you breath it for too long.

Don

IBcarguy wrote:
I agree that the DEF tank could have been designed differently to look better and not hang down so low. I have it on my GMC. I will admit however, that I am very impressed with the emission systems technology and the effectiveness of these systems. The current generation Duramax is very clean and I think they have come a long way in controlling emissions. I have no smoke and absolutely no black residue in my tailpipe (look at any gas motor tailpipe and compare!).

These trucks have had clean tailpipes since the first DPF truck back in 2007. 10 years now...

Yes the technology works. I can put my face up to the tailpipe on my 2012 LML and it smells like the air coming out of a dryer vent. The downside to all of this is all the sensors that come along with making this technology work. One sensor goes bad and you can find yourself on the side of the road in limp mode.

patriotgrunt wrote:

Cummins12V98 wrote:
"It is easier to turn around and come into the pump from the other way. "

Not really possible at truck stops.

I've been in a few "back country" truck stops where this is possible but none of them had def at the pumps. The major truck stops with def pumps that I've visited are much more restrictive on entry and exit.

True story!

Cummins12V98 wrote:
"It is easier to turn around and come into the pump from the other way. "

Not really possible at truck stops.

I've been in a few "back country" truck stops where this is possible but none of them had def at the pumps. The major truck stops with def pumps that I've visited are much more restrictive on entry and exit.

Thermoguy wrote:
This is an odd thread. The DEF Tank on GM hasn't moved since 2011. Are you just now noticing it? I can't recall a single instance where I have read someone has had a problem with the location when off road or a farmer in a field. Not sure why some think that now the 2017 would have any issues. I have been plenty of places with my truck and have never come close to hitting the DEF tank.

These posts are obviously written by people that haven't driven a GM since the model update in 2015. If you had, you would upgrade. I have driven the Ford, have a friend that has one - nice truck, but not as nice as the GM. I have a friend with a Dodge. Can't deny that the Cummings engine is great, but not the transmission and certainly not the quality of anything else on the road.

Seems like a case of envy trying to come up with excuses why your truck is better. Like most people that drive a certain kind of truck, you have to justify why you like your brand...

Why are you trying to bring common sense to this post? You will soon learn that it does not apply on these forums.:B

You can bet that if it was an issue it would have been moved a long time ago.

I would think that the fill tube being under the hood would have something to do with that design. I would also think there are fewer issues with putting DEF into the fuel tanks because it is not under the fill cover on the other two. Those locations have been discussed and cussed many times on this forum.

Fast Mopar wrote:
It's a very strange design, but I enjoy reading how people try to defend and justify it.

Or use it as an excuse to make it the reason they did not buy a new GM vehicle.

What one is looking at when seeing that thing is the secondary/ protective (spill?) containment pan.

FishOnOne wrote:
When I was kicking the tires on my Dad's new '16 Chevy Duramax a couple of months ago, I pointed out that hideous DEF tank to him and that was the first time he even noticed it...LOL. The step bars kind of hide it which helps. Also looking under the truck the DEF tank appears to be about flush with the transfer case skid plate good or bad.

Also I could tell my Dad was going to struggle pouring the large DEF containers into the port under the hood so I set him up with a transfer pump and stressed that he flushes it with water after pumping the DEF.

Kudos for being a good son and aren't you glad he won't make the mistake of putting it in his fuel tank.

otrfun wrote:

...
Ram says DEF usage is dependent on load, driving style, etc. It's my understanding that typical DEF usage (for a Ram Cummins) is supposed to be 1 - 2 percent.

Yep, 1.4% in our case.

884 mpg DEF vs 12.5 mpg Diesel
~70% of the time towing ~8200#

"Ron, tows really heavy!! He would be considered worst case scenario. His wife is a bit like Lucy who collected rocks along the road. "

You gots that right!!!

I would bet my average mileage would be 11-12mpg.

otrfun wrote:

Me Again wrote:

Cummins12V98 wrote:
My consumption of DEF was 48.6g in 23,416mi @ 481.8mpg. That is with about 10k of that being towing 33K combined.

I may have used 10 or less 2.5 gal boxes in 24.5k. That would be around 1000 mpg. Chris

I've typically seen DEF usage expressed as a percentage of the amount of diesel consumed. Expressing it this way takes into account how much fuel is used. Fuel and DEF usage is dependent on load, driving style, etc.

Have 12k on our '16 Ram 3500. 7k of that was towing a 12k 5th wheel while averaging 11 MPG (diesel). Typically get 17 MPG (diesel usage) when not towing.

Since the truck was new, we've used 8.5 gallons of DEF and burned approx. 930 gallons of diesel (or an overall average of 12.9 MPG of diesel usage). That puts our DEF consumption at .9 percent of diesel consumed. Or, if you prefer, a gallon of DEF used every 1,411 miles (1411 MPG of DEF).

If I assumed Cummins12V98's average diesel consumption was 14 MPG for 23,416 miles, his DEF usage would be 2.9 percent of 1,672 gallons of diesel consumed. Assuming the same 14 MPG for Me Again, his DEF usage would be 1.4 percent.

Ram says DEF usage is dependent on load, driving style, etc. It's my understanding that typical DEF usage (for a Ram Cummins) is supposed to be 1 - 2 percent.

Ron, tows really heavy!! He would be considered worst case scenario. His wife is a bit like Lucy who collected rocks along the road.