Phew! 0.07L Unleaded...but how close can you go...?

zen navigator

Guest
Hi,



Had a close call at the weekend. Put 0.07L Unleaded into the MH. No sooner had I squeezed the trigger, I realised A frantic look at the counter and was reassuranced I got away with it. Blamed the missus for talking to me at the same time...happy to admit I can't multi task



You read about people who say a wee drop of the green stuff is good for the diesel. Now is that historical advice and would be a bad thing for newer common rail \ tdi engine?



How much can you get away with in times of Unlead to Diesel ratio before having to call out the A team. My close call was 1: 650 or thereabouts. How close could you go?



Thinking of adding some diesel additive just to be on the safe side.
 
Last edited:
That was close , could have been a lot worse - Having to pay for the wrong fuel !! :eek:

Worse still having to pay to have the AA pump it out AND the embarasment of it all...:D:D

aa-fuel-assist-2.jpg




STOLEN FROM THE AA SITE

Potential damage

Diesel fuel pumps operate on very fine tolerances and are lubricated by the diesel fuel itself.
Petrol in diesel acts as a solvent – it reduces lubrication and can cause damage to the pump through metal to metal contact.
Some fuel system seals can be affected by the compounds in petrol too.
The further the contaminated petrol goes in the system the more expensive the repair – it can be cheaper in more extreme cases to fit a new engine.
The newer common rail (or HDi) diesel engines are particularly vulnerable – if fuel contaminated by pump wear debris gets as far as the common rail system you may have to replace the low and high-pressure fuel pumps, injectors, fuel rail, line filters and the fuel tank too.
Many systems use a low-pressure electric pump in the tank or sender unit and this begins to work as soon as the ignition is switched on, circulating the contaminated fuel through the pump and rail – so it's important not to turn the ignition on.
Petrol in Diesel

Do not turn on the ignition or start the car
If the car's still under warranty you should check with the franchised dealer regarding their advice and correct remedial action – running with even a small amount of petrol in the tank might invalidate the warranty while some manufacturers advise that seals and filters should be renewed even if the engine has not been run.

Generally a small amount of incorrect fuel should not damage the engine as long as you have not started the car and top up fully with diesel fuel.
  • If you've added more than 10% (5 litres in a 50 litre tank) petrol – Drain the tank and refill with diesel
  • If you've added less than 10% petrol (5 litres in a 50 litre tank) – Top up with diesel and run normally unless the manufacturer has advised otherwise
Diesel in Petrol

Do not turn on the ignition or start the car
This is much less common because the standard diesel nozzle at fuel stations is larger than the fuel filler neck on modern petrol cars – you have to be pretty determined and patient to misfuel with diesel as a result.
If the car's still under warranty you should check with the franchised dealer regarding their advice and correct remedial action.

Generally a small amount of incorrect fuel should not damage the engine as long as you have not started the car top up fully with petrol.
  • If you've added more than 10% (5 litres in a 50 litre tank) diesel – the car shouldn't be run and the tank should be drained
  • If you've added less than 10% (5 litres in a 50 litre tank) diesel – the tank can be topped up with petrol and the car run normally unless the manufacturer has advised otherwise
NOW THE BAD NEWS - IF you have missfuel'd.


Prices start at:
  • £221.50 (£188.51 plus VAT) for AA Members who have been with us for more than one year
  • £256.75 (£218.51 plus VAT) for new AA Members within the first year of Membership
  • £303.75 (£258.51 plus VAT) for non-members
PLUS THE COST OF THE NEW FUEL - AT PUMP PRICE !!
 
Last edited:
fuel booboo

should not be any problems there.

I completely filled a vw pd diesel with petrol
60 ltr,then drove 6miles down road before engine cut out.
towed to a garage tank drained, lines blown through
refilled with diesel. No problems 1000 mile later:eek:

£220 plus fuel costs expensive mistake.

weez
Tony
 
So the AA say 1 part in 10 should be ok. Thought that threshold would be much lower?

Petrol in Diesel

If you've added less than 10% petrol (5 litres in a 50 litre tank) – Top up with diesel and run normally unless the manufacturer has advised otherwise


Googling some of the forums it seems people who have put in as much as 10 litres have just filled up with diesel and gone on there merry way and reported no problems weeks on. So must be something in that?

Not sure if I put that much petrol in a diesel engine, I be happy to drive off.

Dave

That was close , could have been a lot worse - Having to pay for the wrong fuel !! :eek:

Worse still having to pay to have the AA pump it out AND the embarasment of it all...:D:D

aa-fuel-assist-2.jpg




STOLEN FROM THE AA SITE

Potential damage

Diesel fuel pumps operate on very fine tolerances and are lubricated by the diesel fuel itself.
Petrol in diesel acts as a solvent – it reduces lubrication and can cause damage to the pump through metal to metal contact.
Some fuel system seals can be affected by the compounds in petrol too.
The further the contaminated petrol goes in the system the more expensive the repair – it can be cheaper in more extreme cases to fit a new engine.
The newer common rail (or HDi) diesel engines are particularly vulnerable – if fuel contaminated by pump wear debris gets as far as the common rail system you may have to replace the low and high-pressure fuel pumps, injectors, fuel rail, line filters and the fuel tank too.
Many systems use a low-pressure electric pump in the tank or sender unit and this begins to work as soon as the ignition is switched on, circulating the contaminated fuel through the pump and rail – so it's important not to turn the ignition on.
Petrol in Diesel

Do not turn on the ignition or start the car
If the car's still under warranty you should check with the franchised dealer regarding their advice and correct remedial action – running with even a small amount of petrol in the tank might invalidate the warranty while some manufacturers advise that seals and filters should be renewed even if the engine has not been run.

Generally a small amount of incorrect fuel should not damage the engine as long as you have not started the car and top up fully with diesel fuel.
  • If you've added more than 10% (5 litres in a 50 litre tank) petrol – Drain the tank and refill with diesel
  • If you've added less than 10% petrol (5 litres in a 50 litre tank) – Top up with diesel and run normally unless the manufacturer has advised otherwise
Diesel in Petrol

Do not turn on the ignition or start the car
This is much less common because the standard diesel nozzle at fuel stations is larger than the fuel filler neck on modern petrol cars – you have to be pretty determined and patient to misfuel with diesel as a result.
If the car's still under warranty you should check with the franchised dealer regarding their advice and correct remedial action.

Generally a small amount of incorrect fuel should not damage the engine as long as you have not started the car top up fully with petrol.
  • If you've added more than 10% (5 litres in a 50 litre tank) diesel – the car shouldn't be run and the tank should be drained
  • If you've added less than 10% (5 litres in a 50 litre tank) diesel – the tank can be topped up with petrol and the car run normally unless the manufacturer has advised otherwise
NOW THE BAD NEWS - IF you have missfuel'd.


Prices start at:
  • £221.50 (£188.51 plus VAT) for AA Members who have been with us for more than one year
  • £256.75 (£218.51 plus VAT) for new AA Members within the first year of Membership
  • £303.75 (£258.51 plus VAT) for non-members
PLUS THE COST OF THE NEW FUEL - AT PUMP PRICE !!
 
would think you will be ok i did the same with a diesel pug 405 turbo and had no prob at all in fact i do think it ran a bit better after
 
Truckers used to add 1 GALLON of petrol to their tanks in the winter to prevent waxing (I'm going back to the days before winter diesel!), their tanks hold over 50 gal so they would be on 50:1 or more, so as others have said 650:1 is not a problem.

I added 0.5ltr of engine oil to a tank (120:1) to aid upper cylinder and pump lubrication whilst I was running in, so you could add a drop to keep the 'oilyness' up if you're worried.
 
i regularly put petrol in my diesel tank .10 liters in an 80ltr tank .helps it burn luvly and clean. mitsubishi canter or my vw lt50.
ideal if you have a smoky diesel do it just before mot luvly.
 
Once sent a lad down to Portsmouth to fetch a citreon belingo diesel back to yorkshire, gave him a wad of money for fuel.
He arrived back the next day saying it needed half a tank and it is really fast, then I looked at the reciept, he had filled it with petrol. Never had a problem with the van and we did many miles in it
 

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