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Old 05-11-2014, 11:23 PM   #1
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DEF

Once again since I am new to this DP stuff do I need to add DEF to my fuel tank for my 2000 Holiday Rambler with a Caterpillar 330? I think not but I had never heard of DEF until I came on this site.
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Old 05-12-2014, 12:17 AM   #2
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NO!
DEF ,( Diesel Exhaust Fluid) is for 2012 and newer rigs , even the new pick ups are using it for emission reduction.
And DEF is in a separate tank and not added to the fuel but injected by computer control; and since I'll never afford a rig that new that's all I intend to learn about it.
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Old 05-12-2014, 06:49 AM   #3
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Not to mention it's mostly water, so do NOT put it in the fuel tank. Your 2000 does not need it. It was added to diesel engines to meet 2010 emmissions standards.
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Old 05-12-2014, 08:52 AM   #4
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Let me paraphrase what was just said: DO NOT PUT DEF IN YOUR FUEL TANK!!! Or you will be sitting on the side of the road, if you even make it that far.
Your 2000 model year does not require DEF at all.
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Old 05-12-2014, 01:12 PM   #5
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Try it and tell us what happens? Just kidding, but if you have taken your rig for a couple trips some big clues would be it is still running! No DEF tank, no DEF guage in your dash cluster. When we bought our 08 with our CAT there was not DEF, but when we ordered our 12 there was no CAT engines anymore in DP's. The only choice we had was the Cummins with DEF. Not a bad only choice, it is way quieter than our CAT and has lots' of power.
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Old 05-13-2014, 02:47 PM   #6
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Clarification:

DEF is a mixture of Urea (ammonia) and Dionized Water. Diesel Exhaust Fluid (DEF) does not go through the combustion chambers of a diesel engine.

Small quantities of DEF is injected into the exhaust stream and when mixed with the NOx, it changes into harmless nitrogen and water.

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