Put the wrong fuel in! Can anyone help?

rogerwhemr · Feb 28, 2024

Hi all,

I have just purchased a CLA 220 Diesel with pretty much every option apart from the panoramic roof. I work most days so i only drive it occasionally, but when i do it is such a treat. Last night on my way home from a meal out with my wife i stupidly put petrol in it. £50 pounds worth to be exact so around 43 litres or so. I then proceeded to drive it home and it wasn't until i pulled up on the drive that i noticed it judder slightly, i immediately knew what i had done!
So after feeling like an idiot all evening, i'm now trying to find a solution. I've looked online and it says that if i take it to Mercedes they will charge me an arm and a leg, and if they find out about it i can loose my warranty? Is this correct?

Is there a way that i can drain it myself so that Mercedes will never find out about it when it next goes in to them?

rogerwhemr · Feb 28, 2024

rogerwhemr said:
Hi all,

I have just purchased a CLA 220 Diesel with pretty much every option apart from the panoramic roof. I work most days so i only drive it occasionally, but when i do it is such a treat. Last night on my way home from a meal out with my wife i stupidly put petrol in it. £50 pounds worth to be exact so around 43 litres or so. I then proceeded to drive it home and it wasn't until i pulled up on the drive that i noticed it judder slightly, i immediately knew what i had done!
So after feeling like an idiot all evening, i'm now trying to find a solution. I've looked online and it says that if i take it to Mercedes they will charge me an arm and a leg, and if they find out about it i can loose my warranty of Wrong Fuel SOS? Is this correct?

Is there a way that i can drain it myself so that Mercedes will never find out about it when it next goes in to them?

thanks in advance for any help

lynall · Feb 28, 2024

There will be local companies that will suck out the old fuel and top up with fresh, google misfuel or fuel draining etc.
If you have breakdown cover they may be able to sort someone out for you.

If you are handy, you can do it yourself but detaching a fuel pipe under the bonnet and bridging out the fuel pump relay to pump the tank dry into a container or two, refill with fresh diesel and cross your fingers.

Ratae · Feb 28, 2024

I sympathise.
Did the same trick some years ago with my Mercedes Sprinter 208CDi van.
Syphoned the tank.
Changed the fuel filter. (Filled the new one with diesel before fitting which is normal on the Sprinters)
Refilled with diesel.
After a bit of cranking it started & ran fine - & has continued to do so ever since.

The risk is that the diesel lubricates the fuel system & petrol can attack seals & doesn't lubricate & AIUI the 'replace the whole system' is intended to remove any bits & pieces that might have been damaged & will then cause further issues.
In view of that I'm not sure that running the fuel pump to drain the petrol is a good idea.

lynall · Feb 28, 2024

Ratae said:
In view of that I'm not sure that running the fuel pump to drain the petrol is a good idea.

It is the electric fuel pump I am talking about to drain the fuel, it wont do any more harm than may have already been done.

Graculus · Feb 28, 2024

rogerwhemr said:
Hi all,

I have just purchased a CLA 220 Diesel with pretty much every option apart from the panoramic roof. I work most days so i only drive it occasionally, but when i do it is such a treat. Last night on my way home from a meal out with my wife i stupidly put petrol in it. £50 pounds worth to be exact so around 43 litres or so. I then proceeded to drive it home and it wasn't until i pulled up on the drive that i noticed it judder slightly, i immediately knew what i had done!
So after feeling like an idiot all evening, i'm now trying to find a solution. I've looked online and it says that if i take it to Mercedes they will charge me an arm and a leg, and if they find out about it i can loose my warranty? Is this correct?

Is there a way that i can drain it myself so that Mercedes will never find out about it when it next goes in to them?

If youve driven it, the damage to the HP fuel pump will already have been done, when it goes in for 'warranty work' due to running issues, it'll be immediately obvious its been misfuelled. Personally, I'd take it in and get the work done to preserve the engine warranty, restricted warranty due to misfuelling basically means you have no warranty on the whole engine, not just the fuel system.

Put the wrong fuel in! Can anyone help?

rogerwhemr

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rogerwhemr

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lynall

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Ratae

Well-Known Member

lynall

Well-Known Member

Graculus

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