DEF contamination in gasoline

Bill Technician Rosetown, Saskatchewan Posted   Latest   Edited  
Question
Driveability
2013 GMC Sierra 2500 HD SLT 6.0L (G L96 Flex) 6-spd (6L90)
P0300 - Random/Multiple Cylinder Misfire Detected

This vehicle has had enough DEF poured in the fuel tank to cause multiple cylinder misfires and now down to one cylinder misfire. I have yet to take a look at the vehicle. This is a new one for me. I feel a best practice may be recommending Injectors, pump, rail, flush line and steam clean the tank. Seems like it could have a good possibility of a come back if any piece work is attempted. 

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Chris Diagnostician
Bryans Road, Maryland
Chris
 

Hello Bill. I recently took a diesel class on Fords. It was mentioned many times in the class that if this happens it is recommended to replace the entire system. Also it sounds like that is what they usually always do at the dealer. I was talking to a customer of mine and his did this to his truck when it was like new and that is what the dealer did was replaced everything. I think you are…

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Bill Technician
Rosetown, Saskatchewan
Bill
 

Thank you for the input Chris. I appreciate it.

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Cliff Diagnostician
Santa Maria, California
Cliff
 

I wonder if the full coverage vehicle insurance might cover this.... Especially if it was done maliciously. This might be worth asking for the customer to help save some money.

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Chris Diagnostician
Bryans Road, Maryland
Chris
 

That was brought up in the diesel class and some insurance companies were covering this as it could be about 10-15k in damages in the diesels.

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Michael Owner/Technician
Montague, New Jersey
Michael
 

ATG class?

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Chris Diagnostician
Bryans Road, Maryland
Chris
 

yes sir!

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Michael Owner/Technician
Montague, New Jersey
Michael
 

Obviously I had the same one with kris lewis. Good classes.

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Chris Diagnostician
Bryans Road, Maryland
Chris
 

Yup Kris is a great Instructor

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Bill Technician
Rosetown, Saskatchewan
Bill
 

Great advice guys. Thank you.

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Marlin Technician
Estacada, Oregon
Marlin
 

Considering that this is a basic design, port-injection system, I would recommend the following: remove and clean the tank, replace the fuel pump, replace the fuel filter, remove and ultrasonically clean the fuel injectors, run water then blow air through the fuel lines. Effect of fuel injection are of minor consequence in this vehicle; comparing this to the scenario of DEF in a diesel system…

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Martin Diagnostician
Burleson, Texas
Martin
 

Since this is a gas engine, I would drain and clean the tank, replace the pump and filter, then to be honest, I fire that sucker up. See what happens... If it runs fine and trims are correct, I'd ship it. Of course leave the door open for injector replacement in the future. Diesel on the other hand, replace everything.

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Robert Owner
Kennett Square, Pennsylvania
Robert
 

A gas engine with DEF?

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Martin Diagnostician
Burleson, Texas
Martin
 

A 6.0L gm engine is gasoline. 6.6L gonna be diesel...

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Robert Owner
Kennett Square, Pennsylvania
Robert
 

Is not the LC8 a LPG/CNG engine?

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Marlin Technician
Estacada, Oregon
Marlin
 

… point, yes it is! How can someone add DEF to THAT? I suspect that he loaded incorrect vehicle info. LC8 ENGINE LPG/CNG, 8 CYL, V8, 6.0L, SFI, GEN 1, GMNA

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Bill Technician
Rosetown, Saskatchewan
Bill
 

Wrong info, I will correct that if I can. I saw 6.0 and went with it. I have not seen the vehicle yet and maybe not ever. It is 60 miles away from me.

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Martin Diagnostician
Burleson, Texas
Martin
 

I did not pay attention to the rpo code. If it is, then my mistake. I don't see any cng vehicles. That didn't even cross my mind.

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Bill Technician
Rosetown, Saskatchewan
Bill
 

Marlin, The LC8 is CNG. This truck is not CNG My apologies. I have not seen the truck. I saw 6.0 and went with it. Incorrectly entered info. All I know is that it is a gas 6.0. I can get the full vin and correct that.

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Paul Technical Support Specialist
Lefkosia, Cyprus
Paul
   

In theory, in such cases dipping the parts in hot water to dilute the crystals formed and remaining DEF would do. In practice, you can't or at least shouldn't dip injectors and similar parts into water. Hot or cold makes no difference. But the rest parts should be, OK. Still a full system replacement would be the best option, every single pipe, filter, senor or what so ever having contact with…

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