Def In Diesel Tank

Jon Owner/Technician California Posted   Latest  
Resolved
Driveability
2021 GMC Yukon Denali 3.0L (T LM2) 10-spd (10L80)
P2269 — Water in Fuel Condition - Sensor "A"
MIL On

I have a client that filled her diesel tank with DEF. Drove in 2-3 miles before she realized her mistake (MIL came on). There is DEF in the fuel filter. I have not checked farther down the line yet. It has 8000 miles on it. I am hesitant to open this can of worms up. What is your experience with this? I have had clients fill their tanks with DEF before but they have always caught it before driving it. Looking for advice. Thanks in advance.

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Kevin Technician
Alberta
Kevin
 

Refer to a diesel indepentant shop. No dealer need to know it happen. Ford had contamination kit. Costly mistake.

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Stephen Owner/Technician
California
Stephen
 

The def crystallizes the tips of the injectors..youll need to replace all of them, fuel lines, pumps, filters- anything the fuel touches pretty much will have to be replaced for good measure. It's a very expensive mistake.

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Tim Technician
Pennsylvania
Tim
 

Gm Document 5207114 adresses contaminants in the fuel. It states the following Diesel Exhaust Fluid (DEF) is a corrosive fluid that also tends to form deposits on components. In case of DEF contamination in the fuel tank, follow the guidelines below. If the in-tank fuel pump has been run, then it must be assumed that DEF has been pumped through both the low-pressure system and high-pressure…

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Jay Owner/Technician
Rhode Island
Jay
 

Once it crystallizes it’s toast really bad for the engine. that motor is junk don’t bother

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Caleb Diagnostician
Indiana
Caleb
 

Needs a new system. Will be a little cheaper since it's not a V8.

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Dean Technical Support Specialist
New Zealand
Dean
 

Not to put too fine a point on it, and pardon the language - But it's F@cked! As others have said the DEF Chrystilises and continues to do so. It will chemically bond with plastic and slowly release causing repetitive issues over and over again. The only repair is to replace E V E R Y T H I N G!!!! If Fuel touches it, it needs to be replaced. NOTE: REPLACED, Not Rebuilt - You cannot…

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Roy Technician
Iowa
Roy
   

I am not a diesel tech or expert. We did have a customer with a fairly new dodge Cummins put a gallon or two of Def in their tank. They did start it and drove around the block until it started to run poor and stall. He had it towed to our shop. I did some research which mirrors the replies you have gotten. I suggested he call his insurance company first and then take to a dealer. Spoke with him…

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Tom Owner
Wisconsin
Tom
 

Entire Fuel System will need to be replaced. Injectors, Lines, Tubes, Rail(s), Injection Pump, Lift Pump, Tank be cleaned or replaced. That stuff is nasty to the Diesel Fuel System. Don't bring to the dealer, they wont cover it and will possibly void warranty. Customer could try turning it into their insurance company, I've had customer successful in getting paid from them on it.

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Zeb Diagnostician
California
Zeb
 

We have a Chevy Equinox that has been filled and run with DEF twice - fuel & DEF fillers are side by side. First time I replaced filter and drained the tank. Pump ran intermittently. Went to the dealer with repairs north of 2k. All of my tools were DEF stained after working on the tank. Second time it went straight to the dealer for major repairs.

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Dan Owner/Technician
Texas
Dan
 

… Yeah … but ya can't fix STUPID … Ron White. 2:23 youtube​.​com/watch?v=UQv7Tr…

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Chester Instructor
California
Chester
 

The customer needs to call her insurance company. This is often a case of extreme damage. Insurance will pay for this because accidents do happen.

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Dan Owner/Technician
Texas
Dan
 

… Yeah…. but ya can't fix STUPID… Ron White. 2:23 youtube​.​com/watch?v=UQv7Tr…

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Jay Owner/Technician
Manitoba
Jay
 

Hello. Jon Being HD diesel technician we see this every now & then. Def and diesel fuel is a big no no. If your client goes to the dealership, they will most likely avoid the warranty for the fuel system for sure. It’s going to be your client’s dime. I suggest make an insurance claim. Pay the deductible & get it fixed properly, Majority of the fuel system will have to be flushed &…

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Scott Owner
California
Scott
   

Hi Jay, I agree with some other comments that the customer should contact their insurance company, mistakes happen. I do not agree that this would void the warranty. If the dealer can't fix it and offer a full warranty, the insurance company will not fix it, and would total the vehicle. I'm having a hard time thinking about how they would get close to 49k in repairs and not have the remainder…

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Mark Engineer
Colorado
Mark
 

Jon Others have already given great direction. Since the engine was started and the vehicle driven, the ENTIRE fuel system has to be replaced (and as others have already cautioned, REPLACED means REPLACED, not just rinsed). Due to the age (only a 2021), the insurance company, under comprehensive, probably won't “total” the vehicle. The correct repair probably will be in excess of 10k. In…

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Dean Technical Support Specialist
New Zealand
Dean
 

Small CRDI power vehicles are very common here in New Zealand. from Corollas to Hyundai i20’s and every SUV. DEF being sold beside the pump people sometimes think they are saving money by buying cheaper diesel - Only to find out the hard way just how expensive it is. we’d get at least 2 call outs a day nationwide for this issue and 90% of them write the vehicle off.

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Stan Owner/Technician
Georgia
Stan
 

We had a Ford with a 6.7 owner that poured two containers of DEF into the main fuel tank and drove it until it stopped running. It was towed to our shop. When this happens, we are told that Ford says it wI’ll need a new CP4 high pressure fuel pump as well as injectors, the entire fuel system for around 12,000 to 14,000 dollars. I looked at it as having nothing to lose by trying this idea. DEF is…

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Dennis Owner/Technician
Michigan
Dennis
 

Pretty much had the same experience as stan. Only difference was gave the customer couple bottles of stanadyne to add with next couple fill ups. Also changed fuel filters for 2 fill ups after. Going og on 3 years know everthing has been fine.

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Jon Owner/Technician
California
Jon Resolution
 

Thank you everybody. The entire fuel system was contaminated. Everything will be getting replaced. I really appreciate the input. Customer is working with their insurance to help pay for it.

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