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Old 06-17-2012, 09:43 PM   #1
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New Rigs- DEF

Howdy,

I have been dealing with diesel engines for a long time... Today I saw a new thread posted about DEF (Diesel Excaust Fuild) and it having a seperate tank... I have pulled into many truck stops and have seen this as well, They will fill there big tank then take another nozzle and fill a small tank...What is the sole purpose of DEF and what is it suppose to do to help your engine or a rig that has this equiped on board...how does it work and whats the purpose of it...
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Old 06-17-2012, 09:46 PM   #2
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It is a government mandate to clean diesel exhaust. The theory is injecting urea in the exhaust will reduce NOX emissions.
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Old 06-17-2012, 09:55 PM   #3
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Here's a little additional explanation.
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Old 06-18-2012, 10:14 AM   #4
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DEF is the catalyst used in the SCR - Selective Catalytic Reduction emissions control system. Diesel engines made for highway use after 1/1/2010 are required to meet much more stringent anti-pollution specs and SCR is the most widely used method of meeting that requirement.

There is another overview of SCR & DEF here:
Selective Catalytic Reduction (SCR)
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Old 06-18-2012, 11:38 AM   #5
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For those of you who have this on your new rv,, Be Careful !!! Its extremley corrosive,,, don't get it mixed up with diesel fuel,, it ruins everything...
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Old 06-18-2012, 12:40 PM   #6
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Fact Sheet from Fleetguard.

http://www.wccressey.com/Cummins%20F...0DEF%20FAQ.pdf

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Old 06-18-2012, 03:53 PM   #7
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In the first years of the Diesel Particulate Filter (DPF), many manufacturers used raw diesel fuel to clean (regen) the filter by burning it in the filter to eliminate particulates that are trapped. This contributed to poor fuel mileage in those models. About 2 years ago a lot of them started putting a separate tank in for Diesel Exhaust Fluid (DEF) which is burned in the DEF in the regen process rather than raw fuel. This helps improve the poor fuel mileage of the earlier models. DEF can also be pruchased in 2.5 gallon bottles in truck stops, auto parts stores and WalMart for around 15 bucks.
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Old 06-18-2012, 05:40 PM   #8
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Howdy

Thanks for the reply's It never assits to see new stuff coming out to try and keep our zone clean and free... You answered all my questiona but I forgot. to add one question if you have this tank on your rig and you don't use it what will happen to your rig as I know some states not required to have there excaust tested at all and some states are... More B.S to try and make money and control the U.S.A
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Old 06-18-2012, 05:46 PM   #9
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Your vehicle will shut down and will not restart
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Old 06-18-2012, 08:27 PM   #10
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Quote:
Your vehicle will shut down and will not restart
Not quite accurate. It doesn't actually shut down - that could be dangerous. Instead, it goes into a "limp mode" where power is substantially reduced.
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Old 06-18-2012, 08:40 PM   #11
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Originally Posted by Gary RVRoamer View Post
Not quite accurate. It doesn't actually shut down - that could be dangerous. Instead, it goes into a "limp mode" where power is substantially reduced.

Only for about a hundred miles then they shut down.
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Old 06-19-2012, 03:16 PM   #12
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Howdy,

Thanks for all the replys i'm blessed i don't have this or have to deal with this as my coach is a older model as well as my truck is thanks for all help
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Old 06-19-2012, 03:30 PM   #13
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Quote:
Originally Posted by 450Donn View Post
Only for about a hundred miles then they shut down.
From the makers of DEF:

Will a truck stop if it runs out of DEF?
No. An engine will not be shut down or be unable to restart as a result of running out of Blue- DEF™. However, if the DEF tank is empty, engine horsepower will de-rate and BlueDEF™ should be added to the tank.

Blue Def Diesel exhaust fluid
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Old 06-19-2012, 03:58 PM   #14
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I stand corrected. This from discover DEF.com

What will happen if my truck runs out of Diesel Exhaust Fluid (DEF)?


The EPA requires vehicle manufacturers to put measures in place to ensure that vehicles cannot run without DEF. Most manufacturers have approached this in a similar way. Before a truck's DEF tank runs empty the driver is given a series of alerts on their dashboard displays (much the same way as if they were running low on diesel). Generally speaking, when the DEF tank level drops below 10% an amber warning lamp will come on, at 5% this lamp starts flashing and below 2.5% a solid amber warning light is displayed.
If the truck is allowed to run out of DEF completely, the engine's power is reduced. This generally follows the next intentional key-off, when vehicle speed will be limited to 5 mph and a solid red warning will be displayed.


I guess it does not completely shut down. But limiting to 5MPH is as good as in my book.
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