Petrol in a Diesel Hyundai Grandeur? Leave It Switched Off
The motor is safest left off when it hasn't been started since you put petrol in a diesel Hyundai Grandeur, and that includes shifting it away from the pump. As long as your engine stays off that petrol stays inside the tank, so a drain is normally all that it needs to set the Grandeur right.
We come to misfuelled vehicles instead of the other way round, so with Petrol in Diesel your Hyundai Grandeur remains on the forecourt or wherever it has stopped. Hold off trying anything on your own until you've rung us, and we'll explain what to do.
What to do first for petrol in a diesel Grandeur
- Keep the engine off. Any diesel Grandeur will normally start and run with petrol in its tank, and it can seem fine for a few miles, and that is why drivers often drive off without realising something is amiss.
- Leave the ignition off too. On a lot of diesels turning it on will start the fuel pump priming, which pulls fuel from the tank towards your injectors.
- Thinning that petrol by topping up with diesel does not help. It just adds to the tainted fuel we drain from a tank that holds up to 75 litres in your Grandeur, and super unleaded counts as petrol here as well.
- If the car is blocking a pump, put it in neutral then push the vehicle clear. Forecourt staff are usually happy to help with that.
- When you ring 0333 366 0103, we need to know which Grandeur you have, where it is, how much petrol you reckon went in and whether your motor has been started. The precise variant helps too when it's on the badging, for example the Grandeur 2.2 CRDi.
What starting the engine does with wrong fuel in your Hyundai Grandeur
Whilst it sits inside the tank, wrong fuel in your Hyundai Grandeur does not reach the motor. That only starts when it is drawn out, which is what happens when the motor is started. In a diesel engine, the fuel lubricates the injectors and the injection pump on its way through. That protection is stripped away as soon as petrol dilutes the diesel, so the damage, where there is any, is down to driving on that mix.
Once you have driven the Grandeur on it, the right thing to do is pull over somewhere safe then turn your motor off. Even so, we can get all of the tainted fuel out, by draining your tank and then flushing the fuel lines and the fuel filter. Permanent damage is very uncommon if it's caught soon and given a thorough clean.
The Hyundai Grandeur fuel tank capacity, version by version
What counts is what share of the fuel inside your tank is petrol. The same few litres count for more when you fuelled up with your tank almost empty, which is why its capacity makes a difference.
In our data, all the diesel versions of the Hyundai Grandeur use one tank of 75 litres, so the calculation works out the same for every one.
Telling which diesel Grandeur you have
Most of the time the variant is shown on your boot lid, and it is useful to us to know when you phone.
On the diesel Grandeur, the badging found is CRDi.
All the versions on our records come with 2.2-litre engines.
AdBlue in a diesel Hyundai Grandeur
Some diesel cars hold a blend of water and urea, called AdBlue, in a tank of its own with a separate filler, and rely on it to treat their exhaust. The key needs to remain out of your ignition when you've got AdBlue in a diesel Hyundai Grandeur through the wrong filler, and that includes moving the car.
Since it's mostly water, AdBlue doesn't burn and gives the fuel pump no protection at all. It doesn't mix with diesel either, so it settles to the base of your tank where your pump picks up its fuel, and a tank of up to 75 litres won't dilute it the way it would dilute petrol.
No matter how modest the volume, some of it is sucked into the line. Within the fuel system the water dries off and leaves the urea to crystallise, in the filter and injectors and elsewhere, where it attacks the metal it sits against.
The same fuel flap often hides both fillers, and if your Grandeur has an AdBlue filler, it may well be alongside the diesel one. The nozzle for AdBlue is much smaller than the diesel one, and the cap is typically blue.
How a fuel drain on your Hyundai Grandeur is done
There's no garage involved, since we do a fuel drain on your Hyundai Grandeur at the car itself. On the Grandeur the tank holds up to 75 litres, so we drain all of it after we have found out what went in and whether the engine has been run. Your fuel lines and your filter are flushed next, then we refill with fresh diesel and prime the system before starting your motor.
Fresh diesel is what your Grandeur is running on by the time the job is done, and you can drive it away.
AdBlue removal from a diesel Hyundai Grandeur, step by step
Like emptying petrol, AdBlue removal from a diesel Hyundai Grandeur runs through the same stages. AdBlue collects at the bottom of the tank rather than mixing in, and if the Grandeur has been run it can form crystals in the lines, so we clear those through too and swap the filter if it needs doing.
AdBlue removal, as we use the term here, covers AdBlue that went in the incorrect filler and has to come out of the diesel tank. It doesn't cover removing or switching off the AdBlue system on the vehicle.
A fuel drain on the Hyundai Grandeur: the cost
A set quote isn't something we publish, as no two jobs involve the same work. It largely comes down to the following:
- whether the Grandeur has been started or driven, which makes the greatest difference
- the volume put in, weighed against the size of the tank
- whether it was AdBlue rather than petrol
- the location of the Grandeur and how safely we can get to it with the van
We can let you know what this work will probably need once you phone with those answers.
Questions about petrol in a diesel Hyundai Grandeur
What is the fuel tank capacity of the Hyundai Grandeur?
All the variants we have figures for hold 75 litres.
I only put a little petrol in my Grandeur. Should I top up with diesel?
It is not something we'd advise, as adding diesel does nothing to take out the petrol. It just lowers its proportion, and that petrol is still in the fuel system after you drive off. With just a little petrol, a fuel drain to get all of that out is normally all the Grandeur requires.
Must my Grandeur go to the Hyundai dealer?
No. We are independent with no link with Hyundai or its dealers, and we drain and clean the Grandeur wherever it is, so there's no need to move it anywhere.
Am I insured for wrong fuel in my Hyundai Grandeur?
It's worth looking at your insurance, as misfuelling cover is included in some and not others. Whatever it says, we come out to empty your car.
What should I do if my Grandeur got diesel in its AdBlue tank?
In this case, too, the right thing is to leave the ignition alone. Limp mode and a warning are what the majority of motors show you if they are driven that way, and their AdBlue system will need emptying. Let us know which tank your diesel was put in when you call.
What should I do if I have already driven my Grandeur?
Pull over where it's safe and switch the motor off, then keep it off until we get to you. Where you have pulled over, the system is drained and cleaned on the spot, and caught soon like this, it very seldom leaves long-term harm.