DEF tank was filled with diesel fuel. Not the truck's or Ford's fault that there are stupid people out there.

 

Do we know this for sure?

Unless the dealer filled the DEF with diesel, there is no way they'd be refunding the customer.

I'm also surprised that would be the result. You'd get the contaminated DEF message quickly, and no DEF would be injected.

Not to mention, DEF does not continuously inject, and the dosing injector has a very fine nozzle. Diesel would clog it, I think. It is pumped under relatively low pressure.

 

Diesel has a lower mass than water by almost 20% so it would spray through the nozzle easier than the DEF would.

 

It is more viscous, though?

 

Not so sure diesel would clog the injector. The shop used to use diesel fuel to find hairline cracks in diesel engine heads, especially the Detroits which would crack around the valve seats. The diesel would leak through even an invisible crack in the cast steel heads. Might not perform the same in an injector though. Something is still not being told about this whole story.

There is diesel fuel injected into the exhaust from the #8 cylinder injector for the regen. It is possible it was overfueling the regen process and created the problem. But it is also curious this mademoiselle felt pressured to call corporate Ford right off the bat. Too bad she wound up in a Fiat.

 

From reading a ton of posts, it seems at the moment that diesel was added to the DEF. Here was some technical info from Matt at Spartan on the issue:

"There are multiple (and I mean 10+ safeties) in these calibrations that disallow regeneration temperatures to get anywhere NEAR this high. Diesel in the DEF is the only situation in which the ECM wouldn't shut this down yesterday express. Even a split/cracked DPF wouldn't allow it because exotherm temperatures post-filter would be far beyond allowable thresholds on the rear temp sensor.

Diesel in the DEF is going to cause a runaway heating situation, because as temperatures come up (as far as the ECM sees) more DEF (ie, diesel) will be injected to deal with inferred NOx. Nasty positive feedback loop with that.

I seriously doubt the dealership filled it up with diesel in the DEF tank."

 

Never underestimate the folks at the dealership.

There was a user on this forum who took delivery of one of the first 2017's. Thirty (30) miles of driving and it wouldn't start. Towed back to dealer. Determined that the lot porter filled the truck with unleaded when prepping for delivery. Apparently, the truck tolerated the diesel/unleaded mix for 30 miles and said...no more.

 

Except there is no factual proof that occurred other then hearsay by idiots posting on her page.

 

What ever happened to that guy, and his poor truck? Did we ever hear a resolution?

 

I saw this earlier on IG.

I hope that diesel in the DEF tank is the cause and nothing with the engine.I have never read about anything of this nature about the 6.7.Only about the 6.4 when it first came out and I think that was an injector issue.

At first I was thinking this was fake.But after seeing how he continued to drive around with the truck shooting fire,I can see now how the DEF tank was filled with diesel .

 

Exactly my point. Too many fail safes for this to happen to a truck that has all the right fluids in place. Someone has to do something wrong in order for this to happen.

 

Did some backtracking. User was ChrisDGall. Found the original thread dated 09-04-2016. Never updated his status or resolution.

Then on 09-28-2016 he asked a couple questions about tow differences between the 250 and 350.

Then on 10-01-2016 he asked about last date to make changes on a ordered vehicle.

At this point, by following his posts, I can only assume (I know, terrible thing to do) the dealer accepted a return and he ended up ordering a new truck. Other than that, nothing heard. Would like to know resolution as well, just out of curiosity.

 

There is a fail safe for bad DEF, too...its called the "Contaminated DEF" message. I'm not sure if that message prevents DEF from being injected once it detects that or not, but seriously...you'd have to be a complete idiot to pump diesel into the DEF fill. The filler cap is smaller than ever...it looks like it'd be a difficult to even insert a filler nozzle in to.

I'm not buying it.

Perhaps the "failsafe" failed. Perhaps one or more of the temp sensors failed and read low...resulting in more and more diesel being injected on the exhaust stroke.

I can guarantee if the owner filled the DEF with diesel, no way the dealer would be buying it back.

If the dealer did, yeah, they would have to.

But more details are needed. How many miles were on the truck? Had the DEF been re-filled ever?

 

Years ago, I personally knew a guy who on the first day of ownership of his new car, opened the hood on his new car and saw the fill cap that read "Oil Fill". He took it off, looked inside and saw no oil. He continued to pour oil in until it was at the top of valve cover. Needless to say, very few seals were left inside that engine after a short drive. Had to pay out of pocket for repairs as dealer laughed when he asked for warranty coverage. (Rightfully so, IMO).

I know...everybody "knows a guy", but this is a 100% true story.

Bottom line: "You'd have to be a complete idiot to pump diesel in the DEF fill." Yes, they are out there and they do exist. Not saying this is what happened in this case, but I do not rule out anything when human decision making is in the formula! ;-)

 

A user in the 6.7 section reported this happening a little over a year ago.

https://www.ford-trucks.com/forums/1...m-exhaust.html