Should You Worry? Petrol in a Diesel Car in Orton Brimbles
Not started? Then less worried than you probably feel. "Have I wrecked it?" is the first thing anyone around Orton Brimbles asks, and the honest answer is normally no, since petrol left in a diesel tank hurts nothing till it is drawn through your fuel system — by ignition priming, by your starter, or by being driven. Petrol in Diesel is who to ring, with the engine kept off, and so it stays that way. Further down, this page sets out what petrol actually does inside a diesel, how far it may have got, and how to stop it happening to you again.
Inside the engine: what petrol in a diesel does
Two jobs fall to diesel on its route through a motor. It protects to begin with, and after that does it burn. Extremely fine tolerances go into the injectors and the high-pressure fuel pump, and just your diesel flowing through keeps those surfaces from grinding together.
Poorly at the first, not at all at the second: that is petrol. Being less viscous than diesel, petrol strips out the protection a fuel system needs, leaving a pump on that mixture to wear itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is why you hear the clattering.
Put those together and the shape of the trouble is clear. Not contact but circulation is what does the harm. Where that petrol is only inside the tank, it is a fault of fuel, nothing more. Once your pump has been labouring on that petrol, a mechanical fault has started: whatever is shed by a pump that is wearing down travels downstream to your injectors with the fuel.
Petrol in a diesel around Orton Brimbles: how bad is it? Four situations
The best case there can be: filled up, never started. Being on a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With the petrol held inside that tank alone, it is cleared and purged on the spot, and nothing more is needed.
The ignition switched on, or a short start. With the fuel system primed, the lines and filter now contain petrol that has come from the tank. Still usually straightforward: drain, flush, and the fuel filter dealt with.
Driven a couple of miles. Now your pump has spent those miles labouring on diluted fuel. Tank, lines, filter, then clean fuel put through the entire system: that is the work, and the way the car was driven counts as much as the mileage. On the school run to Ormiston Meadows Academy, the distance is short. A run as far as Peterborough, under 5 miles away, is a very different task. So is any mileage on the A1(M), under a mile from Orton Brimbles, where your engine has been labouring hard throughout.
Driven on till it complained — clattering, smoke, an uneven idle, a dead throttle. The engine is telling you your fuel is no longer acting like diesel. Leave it wherever it stops: a lay-by, a side street, the verge on Lessingham. Lasting damage is very rare if a car is pulled over soon, and the fuel drain and flush that still come first deal with it.
Petrol in a diesel stories Orton Brimbles drivers hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Nothing is removed when you top up — the tank just carries more of the same mixture. Percentage is not how a diesel fuel system tolerates petrol, whatever that advice presumes.
If anything, the opposite is true. Myth: "A newer diesel can cope with a bit of petrol." Protection matters more on newer diesels, not less, since their fuel runs through smaller parts at higher pressure.
The myth that catches drivers out: if it starts and drives, it must be unharmed. Diesel in a petrol motor normally means a motor that will not run: the driver stops, and so does the harm. Feed petrol to a diesel and it usually starts, idles and pulls away as if nothing happened — all while its pump is wearing. Running is not the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a different fault. What petrol has thinned stays thinned, and that petrol remains in that tank regardless.
The next start sends petrol back round the pump from the fuel lines and the filter, where some of that ends up once the motor has run. That's why a DIY tank drain doesn't sort it — a myth. It is also truly risky to drain petrol into a can at the kerbside.
How petrol ends up: petrol in a diesel
It's seldom carelessness, and nobody does it on purpose. 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 straightforward, and just in one direction.
Habit and the car falling out of step is when it happens. Any vehicle that's new to you — hired, on loan as a courtesy car, or brand new. One petrol and one diesel on the driveway of the same household. A well-known forecourt with the pumps in a different order. Racing for a train at Peterborough and fuelling up en route. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you at the forecourt for its first tank — that is when. Your hand does what it has always done when you add rain, a phone call or a back seat full of kids.
Next time you fill up around Orton Brimbles: avoiding petrol in a diesel
- The label is what matters, so check the pump instead of the colour: in the UK unleaded handles are usually green and diesel black, yet not on every forecourt.
- In a vehicle you don't know, look inside the flap over the filler or at the cap before the first fill: plenty of vehicles state the fuel there.
- One of each in the household? Label your key to your diesel — a bright fob, a sticker — because meaning to remember isn't enough.
- It seems silly and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump.
- While you are thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Add-on devices are available for motors without one, and some diesels come with a filler that will not accept a petrol nozzle. Helpful — but a safety net only, never a reason to stop checking the label.
- Spotting it mid-fill? Stop at once. A weaker mix follows from less petrol inside that tank, but your next step remains the same: do not crank it.
Put petrol in a diesel around Orton Brimbles already?
Then the order of things is short. Do not turn the ignition on, and do not start it. If you are still on the forecourt — The Co-operative or anywhere else — ask the staff to help you roll the vehicle away from the petrol pump. What went in, about how much, and whether it has run: tell us that when you ring 0333 366 0103.
If it was AdBlue rather than petrol, say so. That is a different problem — corrosion and deposits instead of lost protection — and it has its own page for Orton Brimbles.
Orton Brimbles petrol in a diesel tasks: why one costs more than another
The four scenarios above are four different jobs, so no single price for this would be honest. What moves your cost is mostly which of them you're in. Two things come after that: the petrol that got in as a share of what that tank holds, then the spot the vehicle is in and whether a technician can reach it safely.
Before any quote, not after, we ask three questions: the fuel that was put in, the amount, and whether it's run. That's why. Given those replies, you get a straight figure instead of a range.
About Orton Brimbles and where it is
Orton Brimbles is a suburban area located near Peterborough in Cambridgeshire, sitting at an elevation of 24 metres in the eastern part of England. Orton Brimbles is characterized by its predominantly detached housing stock and is situated close to other Orton suburbs, including Orton Waterville, Orton Wistow, and Orton Southgate. Orton Brimbles is approximately 72 miles from London and has a population of around 4314 residents.
Orton Brimbles and Cambridgeshire: where our fuel drain cover reaches
Orton Brimbles sits in the PE postcode area, and our vans that answer petrol in diesel calls there work the locations around it as well — Orton Waterville, Orton Wistow and Orton Southgate among them. A forecourt, a supermarket car park, a lay-by or your own drive are all locations our engineers work, and your car doesn't need to come to us.
At the pump in Orton Brimbles, right now?
Then, you could not be in a better position. Keep it turned off, then ring.