DEF TANK Over Fill - Ford Powerstroke Diesel Forum
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Old 02-04-2014, 07:58 PM
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DEF TANK Over Fill

What is the big deal about over filling the DEF Tank??? I ask because I did just that earlier today. Truck was already soaked as per raining all day long. Washed it off the side of the truck very rapidly but have seen in places {maybe the manual} not to over fill this tank...WHY
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Old 02-04-2014, 08:08 PM
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Overflow onto the ground is the main reason I see why not to overflow. Our mechanics always fill the DEF tanks when they change our oil so can't actually say why since I have yet to pour a drop in yet, lol
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Old 02-04-2014, 08:09 PM
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because it crystalizes when it is exposed to air for too long which can damage your paint and or cause the cap to become stuck or frozen due to crystallization around the cap supposedly all urine does this ?? hahaha
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Old 02-04-2014, 08:20 PM
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DEF TANK Over Fill

DEF freezes at like 30F. The tank is designed to handle the expansion of freezing DEF but if it is over full, there is a chance it can get damaged -or so they say anyways.

Last edited by Steveaux; 02-04-2014 at 08:29 PM.
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Old 02-04-2014, 08:49 PM
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Yeah overflowing urine is bad...
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Old 02-05-2014, 08:54 AM
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Quote:
Originally Posted by Steveaux View Post
DEF freezes at like 30F.
I looked this up recently out of curiosity during an extremely cold spell. The answer I found from multiple sources was that it freezes at 12F. Ford's system has a heater in it though from what I've read.
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Old 02-05-2014, 09:21 AM
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Quote:
Originally Posted by fiveohpatrol View Post
I looked this up recently out of curiosity during an extremely cold spell. The answer I found from multiple sources was that it freezes at 12F. Ford's system has a heater in it though from what I've read.

Ah, thanks for the correction. I couldn't remember the exact freezing point. The heater only works when the truck is running. It could still freeze if left sitting overnight for example.

From the manual:
Filling the DEF tank in cold climates
DEF will freeze below 12F (-11C); however, your vehicle is equipped with an automatic preheating system which allows the DEF system to operate below 12F (-11C). When the vehicle is not in operation for an extended period of time with temperatures at or below 12F (-11C), the DEF tank could freeze. If the tank is OVERFILLED and freezes, it could be damaged, therefore DO NOT OVERFILL.
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Old 02-05-2014, 09:55 AM
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I did read on my friend's facebook page that in his new Cummins, the system is NOT heated, and when we had a few day below 0 streak, it froze and the truck would not run without it being operational. That's a serious design flaw.
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Old 02-06-2014, 07:31 PM
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Don't worry about spilling that crap. It won't hurt paint, shoes, pants, etc. We go through hundreds of gallons of it on the farm (unfortunately) and it's ended up everywhere you can imagine. No ill effects yet. As far as expansion due to freezing; tank is heated and has an overflow. I wouldn't sweat it.
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Old 02-07-2014, 04:40 AM
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I over flowed it on our cab and chassis the other day. It didn't do anything on the ground but look wet and it didn't get any on the truck so can't offer advice there lol. If you don't know how full the tank is and your filling up with them stupid 2.5 gal container how can you tell when to stop. Lol. It's gonna over flow.
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