DEF won't fill
Cargo Master
Joined: Feb 2015
Posts: 2,338
Likes: 255
From: Livermore Ca.
My filler tube is ‘like new’, there is no way this thing is blocked and I cannot get the air to go into the jug. As posted above, I need to squeeze the jug, when I can no longer squeeze the thing I need to back it out a bit and let air back into the jug. Maybe I’m doing something wrong but following this process I can get 2 jugs into the tank when I get the 500 mile warning.
6.7 Weight Loss
Joined: Jun 2017
Posts: 1,141
Likes: 5
From: Woodbury CT
I as well like that the tube "locks in place". I just don't get this entire system. It is the single biggest PIA of owning this truck. Thankfully we only have to deal with every 7,000 miles or so. No gauge and you have to wrestle with adding the stuff. I read a post someplace comparing it to when the catalytic converters 1st came out on gassers, how they smelled like rotten eggs, killed performance lowered gas mileage, had a high failure rate and cost a ton of money to replace. We have the 1st gen of this system which over time will become a "no brainer" just like the catalytic converters on gassers are. I guess there are improvements in the '17 - '19 models.
Hotshot
Joined: Nov 2013
Posts: 10,107
Likes: 96
From: Hempstead, TX
I buy my DEF at the pumps of my local fuel station. When a GM pulls up, he has to position his truck twice - once for fuel, and again for DEF. When filling his DEF, he has to pull the DEF hose across his fender to reach the fill. Additionally, his DEF fill is on the opposite side of the truck than his fuel fill, so the DEF hose has to stretch all the way across his engine bay, or he has to move his truck to an adjacent island. I like our way better.
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