Petrol in a Diesel Car in Corkey: How Worried Should You Be?
Not started? Then less anxious than you probably are. Everyone around Corkey starts with "have I ruined it?", and the fair answer is normally no: petrol left in the tank of any diesel stays harmless until priming, cranking or driving draws it into the fuel system. To leave the vehicle that way, phone Petrol in Diesel and leave the motor switched off. Below, you will find what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you again.
Petrol in a diesel: what does it do to your engine?
Diesel has two jobs on its way through an engine. Oiling comes before burning; it does both. What keeps the surfaces inside the high-pressure pump and the injectors from wearing against each other is your diesel passing through them — they're designed to very fine tolerances.
Petrol handles the first job badly and the second not at all. The knocking comes from petrol being made not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips away the lubrication the fuel system rests on, and any pump running on that mix is wearing itself.
Put these together and the shape of the problem is clear. Not contact but movement is what causes the damage. Where the petrol is only in that tank, it's a fault of fuel, nothing more. Whatever a worn pump sheds goes on, carried by the fuel, into the injectors downstream, which is why a pump that has been working on that petrol is where a mechanical fault starts.
How serious is petrol in a diesel? Four situations our engineers see around Corkey
The best case there is: filled up, not once started. At a forecourt, and genuinely only there, that petrol is still limited to your tank — since everywhere else the car was driven to reach it. The job is draining and flushing on the spot.
Your ignition switched on, or a brief start. The system has been primed, and so petrol has left that tank and got to the filter and your lines. That is usually still a straightforward task — a drain, a flush, and your filter dealt with.
The pump now worked a couple of miles on weakened fuel — that is what driving it does. Tank, lines, filter, then fresh fuel run through the entire circuit: that is the work, and the way the car was driven matters as much as the mileage. On the school run to the local primary school, the miles is small. Driving as far as Belfast, under 50 miles away, makes a very different job — as does any miles on the M77, over 50 miles from Corkey, with the engine running hard the whole time.
Driven till it protested. Clattering, an uneven idle, smoke, a throttle that has gone soft. That's the motor telling you its fuel no longer is acting like diesel. Pull up where you are — on the verge on B842, at the kerb, down a side road — and don't move it again. What comes first is still the fuel drain and flush, and that takes care of it, with long-term damage very rare if a vehicle is stopped soon.
Stories Corkey drivers hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. A bigger tank of the same mixture is all it gives, because topping up takes out nothing. That advice supposes a diesel fuel system tolerates petrol by percentage. It doesn't.
Myth: a current diesel copes with a bit of petrol. If anything, the reverse. Finer components and higher pressure are the way a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
Myth: "If it starts and drives, there's no harm done." This is the one that fools drivers. Diesel in a petrol motor usually leaves a motor that won't run: the motorist stops, and so does the harm. Whilst your pump grinds, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Running isn't the same as fine.
Myth: a two-stroke additive lets you to drive home. It is an old fix, supposed for another issue. That petrol is still inside your tank afterwards, and whatever it has weakened is not put back.
The next start draws petrol back round your pump from your lines and the fuel filter, where some of that ends up after your engine has been run. That's why a DIY tank drain does not sort it — a myth. Also, a can of petrol drained at the roadside is genuinely risky.
How petrol ends up: petrol in a diesel
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle mostly will not fit a petrol motor, yet the slimmer petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error easy, and only in that direction.
Habit and your car falling out of step is how it takes place. Hire cars, courtesy cars, and cars that are new to you. A household with one petrol and one diesel on the driveway. Your ordinary forecourt, its pumps now in a different order. Filling up in a hurry en route to the nearest station, with a train to catch. Years of petrol cars behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that's when. Add rain, a phone call or a back seat full of kids, and your hand does what it has always done.
Corkey motorists: how to avoid petrol in a diesel next time
- The label is what matters, so check the petrol pump rather than the colour: in the UK unleaded handles are usually green and diesel black, yet not on every forecourt.
- Plenty of motors state the fuel inside your filler flap or on the cap, and so check it on your first fill in any motor you do not know.
- One of each in the house? Label your key to the diesel — a bright fob, a sticker — because meaning to remember isn't enough.
- Before the nozzle leaves the petrol pump the first time you fuel a hired or new motor, say "diesel" out loud. Daft, perhaps, but it works.
- Whilst you're thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Some diesels come with a filler built to block a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump.
- Less petrol means a thinner mix, and so stop the moment you realise — though remembering that the next stage is unchanged. It is still not to fire it up.
Petrol already in a diesel in Corkey? Begin here
In that case, there is only a short order of things. Don't turn the ignition on, and do not crank it. If you're still on the forecourt — the nearest petrol station or anywhere else — ask the staff to help you push the vehicle away from the petrol pump. What got in, roughly how much, and if it has run: tell us those when you ring 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a separate fault — Corkey has a page all for it.
One petrol in a diesel job around Corkey costs more than another. Why?
Four different jobs lie behind the four scenarios above — which is why there's no honest single price. What shifts your cost is chiefly which of them you're in. Next it is the share — how much petrol went in against how much your tank holds — and after that where the car is and whether a technician can get to it safely.
What went in, how much, and whether it has run — three queries our engineers ask before costing, not after, for precisely that reason. Given those answers, there is a straight figure instead of a range.
About Corkey and where it is
Corkey is a small locality in County Antrim, situated inland at an elevation of 145 metres, approximately 35 miles northwest of Belfast. Corkey is characterized by its semi-detached housing and is located near the villages of Loughguile, Cloughmills, and Armoy. Corkey has a population of around 521 residents, making it a small but distinct community in the region. Corkey is also relatively distant from major cities like London, being around 354 miles away.
Fuel drain cover around Corkey and across County Antrim
Petrol in diesel calls in Corkey — part of the BT postcode area — go to teams that also cover the spots about it, Loughguile, Cloughmills and Armoy among them. No need to bring your car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all locations we drain.
In Corkey and still at the petrol pump?
The best place there is, then — that's where you are. Keep it off. Phone.