Question about 2007 Volkswagen EOS Convertible

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Diesel fuel in a gas eos

Put diesel fuel in gas eos, drove for about 20 miles had car towed to dealership, removed fule from tank and lines, replaced spark plugs. Now low power engine light on ws making a whistle noise and sounded like a heat shield was rattling, not up shifting and then made a Big Bang , exhaust now loose and loud, power has returned.

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1 Answer

You have ruined the exhaust converters with the diesel fuel

Its that dealer next to usless?

Posted on Nov 29, 2012

  • 4 more comments 
  • Sam little Nov 29, 2012

    I hope my dealer isn't useless, they have always treated me fairly in the past.

  • Anonymous Nov 29, 2012

    Your a very rare exception They knew you had used diesel fuel & the converters were ruined from that. Let me explain They will take your money & do little When the cost to you is alot they do nothing Go to a reoair shop when your warantee is up Dealer as for warantee work too expensive & you see the results you get

  • Sam little Dec 09, 2012

    They tried the flushing and refueling first to try and save me some money. They were hoping the converter and turbo unit hadn't been damaged.Still waiting for parts to arrive. All will be well.

  • Anonymous Dec 09, 2012

    Let us know the end results I didn't mean to be hurtful but when you get a thousand questions a week from people who have just left a dealer for the third time & zero results it make you very frustrated as on a good day you could resolve at home in you driveway but a professional can't

  • Sam little Dec 29, 2012

    One new catalytic converter and car is as good as new. All repairs covered by auto insurance.

  • Anonymous Dec 31, 2012

    Good Deal



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Ran out of gas other day leaving work, grabbed a gas can out of shop. Didn't realize there was diesel fuel in there. Not much, less than 1/2 gallon. Drove about 1/4 mile and van died. Had to tow it home....

you are gonna have to purge the diesel out i would think. most likely its still in the fuel lines. is there a pressure test port on the intake? if so cover it with a rag and vent the line a few times after pressurising it up by turning the key on

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You need to bleed your fuel line. Diesel leaves a thin coat of oil and this needs to be removed via bleeding the line in order to get a high enough octane level that will be combustible and burn off any other residue that could be left with inside the cylinder itself.

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3:1 gas/ diesel in 2011 kia what can I do to remove it?

This site may have all your answers:

Basically do NOT drive the car and have the gas tank drained or talk to a mechanic.

Accidentally putting diesel in a gas car If you know that you have accidentally put the wrong fuel in the car, then don't compound the mistake by driving the vehicle while trying to think about what to do. Instead, call your mechanic immediately. At this point, the damage isn't permanent. If you drive and continue to drive, at one point the vehicle will stop and you will still have to have it towed.

There are two things you can do to try to fix the damage:
1. Try to clean up the damage yourself - have the vehicle towed home if it's not there already, and get as much of the diesel fuel out. How? By siphon if you can or any other method that you have available. Once you have as much of the diesel out as you can, fill the tank with the correct unleaded fuel that you normally use. Try to start the vehicle. It could take several attempts but it will start and it will smoke - a lot. It will continue to smoke until the last dregs of the diesel make its way through the system. It might run a little rough until everything is cleaned out. How it runs will depend on the proportion of diesel fuel relative to gas left in the tank.

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It sounds like there is still some water in the fuel system. I am assuming that this noise was not present prior to the fuel issue. The water in the fuel would not have impacted the bearings on the crankshaft. In most cases, there is water in all gas, but not as much as you had. I recommend that you change the fuel filter and that you go to an auto parts store and get some MARVEL MYSTERY FUEL ADDITIVE or OIL, and pour it in the gas tank. This will clean the fuel system, and remove any remaining water in the system. I would then start the vehicle and let it idle for a few minutes, then start raising the engine RPM's to no more than 2500-3000 RPM's for a few minutes. This will help move the product through the fuel lines, and intake system.

I hope that you have found this information to be useful, and if I can be of any further assistance, please let me know. Thank you for using fixya!

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Yes, you must drain the tank. Running with diesel may damage the engine and the catalytic converter. The fuel line and filter should also be cleared of diesel.

This car has a cover over the fuel tank underneath, and the service manual I have shows no drain plug on the bottom of the tank, so it will have to be drained at the top by removing the fuel pump, or by disconnecting the fuel line at the engine and running the pump until it is dry.

You may wish to hand this job to a mechanic. Try a mobile mechanic van that comes to you so the car does not have to be towed.

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