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6.7L Power Stroke Engine and Drivetrain Discussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

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Old 04-16-2011, 11:29 AM   #1 (permalink)
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DEF tank size?

I did a search on this forum, but never got a specific answer. After your ""low DEF" warning shows up on the odo- how much DEF can you safely add without spilling it all over the place? It's really annoying not knowing how much is in the tank. I would imagine it would be easy to overflow this thing and make a big mess.
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Old 04-16-2011, 11:53 AM   #2 (permalink)
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If you use the filler spout from ford, it stops filling when full. No overfilling or spilling.

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Old 04-16-2011, 12:01 PM   #3 (permalink)
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It's a 5 gallon tank.
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Old 04-16-2011, 01:35 PM   #4 (permalink)
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Reductant Tank Capacity
  • Inboard frame mounted reductant tank Approximately 19.7L (5.2 gal)
  • Outboard frame mounted reductant tank Approximately 21.7L (5.73 gal)
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Old 05-01-2011, 02:35 PM   #5 (permalink)
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Does the truck read the level in the tank?

I put in 2 gallons when it said I had 1200kms left to go and I didn't gain anything.
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Old 05-01-2011, 08:41 PM   #6 (permalink)
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i added one gallon the day i got it 800 mile drive home dealer didnt fill it then 5 gallons since have 7000 miles on truck
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Old 06-30-2011, 10:55 AM   #7 (permalink)
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Quote:
Originally Posted by torino73 View Post
I would imagine it would be easy to overflow this thing and make a big mess.
If you do spill DEF, give a good wash down with water to dilute it. Do this immediately and then it wont harm your surface in any way. Its non-hazardous but it can react with some materials and leave a mark.
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Old 07-04-2011, 07:41 PM   #8 (permalink)
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Once you get the "less than half full" message, you can safely put in a 2.5 gal jug.

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Old 07-05-2011, 08:20 AM   #9 (permalink)
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The DEF tank has a limited guage in it. It knows if you are OK ( basically above half full) It knows when you are below half and then it reads some values at the bottom of the tank.

So don't expect it to change the display unless to add enough to reach the next level.
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