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Old 03-05-2021, 04:51 PM
slip knot slip knot is offline
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Join Date: Jul 2015
Location: Texas gulf coast
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I had a generator tech come in and fix a DEF leak on our genset. its got two onboard 40 gallon tanks and a 200 gallon remote tank. The hose between the remote tank and onboards was leaking.
He was telling me that DEF can go bad. These generators have onboard monitoring of the %DEF in the solution and once it gets out of range it would cause the genset to go into derated mode. I knew it wasn't supposed to be stored in sunlight but never heard of it getting stronger as the water evaporates off. He seemed pretty sharp on the genset and even showed me where to find the % on the HMI for the generator. Just one more headache to monitor for.
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Old 03-05-2021, 06:08 PM
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Matt Shade Matt Shade is offline
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Join Date: Jan 2007
Location: Ohio
Posts: 3,065

One of the first things they did when I took my truck in for warranty work was dip the tank and test the quality of my DEF. I have a strong suspicion they'd have hung all the repairs on me if it hadn't tested out correctly.
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Old 03-05-2021, 06:11 PM
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astronut astronut is offline
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Location: Louisiana
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With all I have been reading on this thread, I am very glad I do not own any diesel powered vehicles where I would have to use that DEF stuff!
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Last edited by astronut; 03-06-2021 at 08:19 AM.
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Old 03-06-2021, 02:57 AM
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greywynd greywynd is offline
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Join Date: Dec 2005
Location: Wainwright, Alberta
Posts: 5,609

Yep, they have used a refractometer to test mine a time or two. Can’t recall what the ‘spec’ is offhand.

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Old 03-10-2021, 10:11 PM
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rustythe4x4 rustythe4x4 is offline
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Join Date: Oct 2010
Location: Saskatchewan
Posts: 1,612

In my experience, in the mild temps during winter (just below freezing) the new diesels seem to over compensate and dump more than the 1 to 2% of fuel used they are supposed to. My last 6.7 Cummins would run at nearly 5% when the temp hovered around-4 Celsius. My latest 6.7 Cummins stays at about 3% at those temps.

Also note the DEF and DPF are not supposed to be interconnected, and the DEF is also supposed to cease injection while doing a regen (they say it could interfere with the regen process)

Dodge and Ford have both made official statements to not fill their DEF tanks past half during freezing conditions, but GM seems to pretend freezing won't affect the system. (Which it does)
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