DEF use
Lead Driver
Joined: Nov 2005
Posts: 5,235
Likes: 4,251
From: Kaysville Utah
You don't want it over filled in cold weather. the tank is designed to have DEF freeze at 12° but the filler hose is not and the freezing DEF will crack the filler line.
I usually leave my tanks on the low side in the winter months.
On the other note. I personally think that DEF crystallizes so easily that it coats the sensors in the tank. When you add new DEF, it some times takes a few hours for the crystals ti disolve and allow the sensors to do their job. What ever the reason, it often takes a few hours for the DEF gauge to recognize the fill up.
I usually leave my tanks on the low side in the winter months.
On the other note. I personally think that DEF crystallizes so easily that it coats the sensors in the tank. When you add new DEF, it some times takes a few hours for the crystals ti disolve and allow the sensors to do their job. What ever the reason, it often takes a few hours for the DEF gauge to recognize the fill up.
6.7 Weight Loss
Joined: Jun 2017
Posts: 1,141
Likes: 5
From: Woodbury CT
If he got the "500 mile" warning it should take roughly 5 gallons. He said he added 2 gallons and it overflowed, then got the warning again. If any of that 2 gallons went into the DEF tank he shouldn't get the 500 mile warning for somewhere between 1,000 and 2,000 miles.
Now as we all know, filling the DEF tank is a PIA. Using a funnel and a jug of DEF isn't going to work. Or at least I can't get it to work
Daywork, are you using the Ford PM-27-N filler tube? Did you line the arrow up with the jug? Even with the arrow lined up and the Ford filler tube I still struggle to have the stuff flow easily into the tank. I squeeze the s**t out of the jug, I then back the tube out of the filler neck, allow air back into the jug and repeat until the jug is empty. I'm not quite sure it "overflows" using the Ford filler tube, my experience is that you can't get anymore into the tank. If you did use the Ford filler tube and it did overflow at 2 gallons I would say there is a problem. What year truck? How many miles?
Now as we all know, filling the DEF tank is a PIA. Using a funnel and a jug of DEF isn't going to work. Or at least I can't get it to work
Daywork, are you using the Ford PM-27-N filler tube? Did you line the arrow up with the jug? Even with the arrow lined up and the Ford filler tube I still struggle to have the stuff flow easily into the tank. I squeeze the s**t out of the jug, I then back the tube out of the filler neck, allow air back into the jug and repeat until the jug is empty. I'm not quite sure it "overflows" using the Ford filler tube, my experience is that you can't get anymore into the tank. If you did use the Ford filler tube and it did overflow at 2 gallons I would say there is a problem. What year truck? How many miles?
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