Transit Diesel Nightmare - Page 2 - Ford Transit USA Forum
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post #11 of 26 (permalink) Old 02-09-2016, 11:34:PM Thread Starter
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Was not recent.... Couple thousand miles ago.
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post #12 of 26 (permalink) Old 02-10-2016, 11:53:AM
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Was the DEF fill up recent or just prior to the onset of the problems?
I'm also curious to know
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post #13 of 26 (permalink) Old 02-10-2016, 01:23:PM Thread Starter
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Was not recent. Couple thousand miles ago.
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post #14 of 26 (permalink) Old 02-10-2016, 01:58:PM
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I find it extremely hard to believe if diesel fuel was present in the DEF tank a couple of thousand miles ago the problem just showed up.
The Reductant (DEF) Control Module monitors NOx sensors to know how much DEF to inject, so it would know almost immediately there was a problem.

So it would seem the diesel fuel had to have entered the tank very shortly before your CEL came on....and not at your last fill 2,000 miles ago.

It seems extremely unlikely the DEF could test good at the "nozzle" (I presume they mean the injector) yet contain diesel fuel in the tank.

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Last edited by Budsky; 02-10-2016 at 02:07:PM.
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post #15 of 26 (permalink) Old 02-10-2016, 02:24:PM
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If diesel pump nozzels for cars and trucks will not fit the filler tube for the DEF tank then the contamination was with DEF pump at DEF fillup. If DEF regeneration did not occur for some time (? How far before or between DEF regen.) or miles then could there be a delay until contaminated DEF was injected. Evidence seems to point to bad DEF from truck stop. Others should have been affected but with some variable delay and would be hard to find the source. Like tracking a point source for an infection. I hope you can find the DEF receipt and could find out if perhaps someone put diesel into their DEF pump tank. Should be a lot of angry truck drivers if that was the source. Have others had the same from that station?

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post #16 of 26 (permalink) Old 02-10-2016, 04:58:PM
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I think you've confused DEF with DPF.

There is no regen involving DEF. DEF is injected to reduce NOx emissions using the Selective Catalyst Reduction (SCR) convertor.

The regen is used to clean the Diesel Particulate Filter (DPF), and is a separate system. It injects diesel fuel to raise the DPF to a very high temp to burn off accumulated particulate matter, primarily, soot. This does occur on a cycle when the the DPF sensors determine the filter is filling up. It can be also manually started on some vehicles.

"Beluga" 2015 350HD 3.2D, 3.73, EL, HR.

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post #17 of 26 (permalink) Old 02-10-2016, 07:10:PM
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Got the difference-( with your explanation) but it is still a mystery. Was there another service performed where someone might have introduced wrong fluid into the DEF tank. Some service facilities will do a "top up of fluids" while doing an oil change or tire rotation. Some type of fuel additive or booster that went down the wrong filler? Beyond my pay grade as I would have thought there would be an effect pretty soon after the introduction. Will step back and read to learn more but in the interim no one is going to mess with my tanks but me and I guess the DEF pump at the truck stop is out even though it is way less costly that the individual 2.5 gallon containers. I pretty much felt that there is not much difference from one type DEF to another.

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post #18 of 26 (permalink) Old 02-10-2016, 07:25:PM Thread Starter
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Got the difference-( with your explanation) but it is still a mystery. Was there another service performed where someone might have introduced wrong fluid into the DEF tank. Some service facilities will do a "top up of fluids" while doing an oil change or tire rotation. Some type of fuel additive or booster that went down the wrong filler? Beyond my pay grade as I would have thought there would be an effect pretty soon after the introduction. Will step back and read to learn more but in the interim no one is going to mess with my tanks but me and I guess the DEF pump at the truck stop is out even though it is way less costly that the individual 2.5 gallon containers. I pretty much felt that there is not much difference from one type DEF to another.
Another very unlikely source is new vehicle prep. They told me the diesels come in empty and they fill the def. BUT that was 12,000 miles ago. I don't really have a scenario that makes total sense to me. I have only opened the def fill once, and it was a while back. Only one thing for certain, I will be paying the $2500+ bill tomorrow. I need to find the source because I fear future mechanical problems and resale issues.
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post #19 of 26 (permalink) Old 02-11-2016, 08:59:AM
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Be sure to get whatever DTC codes they found, the old parts they replaced and the DEF they drained or at least a sample of it.
Let us know- something about this all just smells fishy....

I also read on another forum where a guy went through something similar with his diesel Ford pickup where they told him his DEF was bad and when it was finally tested with a high priced specialized testing instrument it was fine...
I'm still puzzled by how they said the DEF was fine at the injector nozzle but later said it was bad in the tank.

"Beluga" 2015 350HD 3.2D, 3.73, EL, HR.
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post #20 of 26 (permalink) Old 02-25-2016, 09:54:PM Thread Starter
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Be sure to get whatever DTC codes they found, the old parts they replaced and the DEF they drained or at least a sample of it.
Let us know- something about this all just smells fishy....

I also read on another forum where a guy went through something similar with his diesel Ford pickup where they told him his DEF was bad and when it was finally tested with a high priced specialized testing instrument it was fine...
I'm still puzzled by how they said the DEF was fine at the injector nozzle but later said it was bad in the tank.
Update.... Sorry for the delay.

There are SO many things wrong with what the dealer is telling me. One of the latest developments is the fact that I emptied the contents of the old def tank into clean clear 1 gallon containers. There was well over 5 full gallons. The tank is only supposed to hold 5.5 gallons. And this is after the van was driven about 4,500 miles since the last def fill. My theory is that the dealership mechanic emptied my tank into what he thought was a clean container, but it contained diesel fuel, and returned all of the liquid, including maybe 2 gallons of diesel, back into my tank. Per their shop notes, the DEF tested clean twice, and only tested contaminated after they drained and filled the tank. They keep contradicting themselves… Originally when I asked them how could I drive this far with contaminated def? they told me that because diesel fuel is lighter, it would stay on top in the tank, allowing the pickup to only pull clean def from the bottom of the tank. Then later told me that "Of course it didn't consume any liquid, there was diesel in the pump". According to everyone I have talk to it is impossible to drive 4000 miles without any actual DEF in the tank.
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