West Field: Petrol in a Diesel Car? How Worried to Be
Less than you likely are, provided it has not been started. "Have I wrecked it?" is the first question anyone in West Field asks, and the honest answer is usually no, since petrol left in a diesel tank hurts nothing till it is dragged through your fuel system — by ignition priming, by your starter, or by driving. Keep it like that: leave your motor off then phone Petrol in Diesel. Further down, you will find what petrol actually does inside a diesel, how far it may have got, and how to stop it happening to you again.
What petrol in a diesel does to the engine
Diesel has two jobs on its way through a motor. It lubricates first, and only then does it burn. What keeps the surfaces inside the high-pressure pump and the fuel injectors from wearing against one another is your diesel passing through them — they're designed to extremely fine tolerances.
The second task petrol doesn't do at all, and the first it does poorly. The knocking comes from petrol being designed not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips away the lubrication your system depends on, and any pump working on such a blend is wearing itself.
Put these together and the shape of the trouble is plain. The damage is done by circulation, not by contact. All a tank with petrol in it amounts to is a fuel issue. A pump that has been working on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with your fuel to your injectors further on.
West Field, petrol in a diesel: four situations, from mild to major
Filled up, not once started. The best case there is. Only the tank has petrol in it, so the job is draining the tank and flushing the system where the vehicle stands. This situation can only truly occur on a forecourt: anywhere else, the vehicle got there by being driven.
Ignition on, or started for a second. Petrol has come out of the tank and got to the filter and the fuel lines, because your system has been bled. Normally nothing more than emptying, cleaning and sorting the fuel filter, and so still simple.
A few miles driven, and the pump has spent each of them working on thinned fuel. Tank, lines, filter, then fresh fuel run through the entire system: that is this work, and the way the car was driven matters as much as the miles. On the school run to Ordsall Primary School, the distance is short. Any miles on the Doncaster By-Pass, under 10 miles from West Field, means the engine has worked hard throughout, and a run to Doncaster, under 25 miles away, is a very different job as well.
Driven on till it complained — rattling, smoke, a ragged idle, a dead throttle. That is your engine telling you its fuel no longer is behaving like diesel. Leave it where it stops: a lay-by, a quiet street, the verge on Queen Street. The drain and flush-through still go first, and they sort it out: if a car is stopped early, permanent damage is very rare.
West Field motorists and that petrol in a diesel myths they hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing is removed by topping up — you are left with a bigger tank, still the same mix. The idea behind the advice — that diesel fuel systems accept petrol by percentage — is wrong.
Not so: a modern diesel copes with a bit of petrol. If anything, the reverse. At higher pressure, through finer components: that is how a newer diesel moves its fuel, so the protection counts more, not less.
One myth that catches motorists out: if it starts and drives, it must be unharmed. Diesel in a petrol motor usually means a motor that will not run: the driver stops, and so does the harm. Whilst your pump grinds, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. A running engine doesn't mean fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It's an outdated workaround for a distinct fault. The petrol is still in that tank after that, and whatever it has weakened isn't put back.
The next start draws petrol back round your pump out of the fuel lines and the fuel filter, where some of it sits once the engine has been run. That's why a DIY tank drain doesn't leave you sorted — a myth. Besides, petrol emptied into a can by the road is genuinely dangerous.
Petrol in a diesel: how does it happen?
On purpose? Never. Through carelessness? Rarely, if ever. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol vehicle at all. The forecourt makes it simple, and the error runs one way.
The moment habit stops matching the vehicle is the moment it happens. Hire cars, courtesy cars, and motors that are new to you. Households running one of each, petrol and diesel. The pumps in a different order on a well-known forecourt. Filling up in a hurry on the way to Retford, with a train to catch. Precisely the moment it happens: after years of driving petrol, a driver fills a diesel Skoda Octavia for the first time. The hand does what it has always done once you add rain, a phone call or a back seat full of children.
Preventing petrol in a diesel next time you fill up in West Field
- Check the pump, not the colour. In the UK unleaded handles are generally green and diesel black, but not on every forecourt. The label is what counts.
- In a car you do not know, look inside the flap over your filler or at the cap before your first fill: plenty of cars print the fuel type there.
- Good intentions do less than a sticker or a fob in a bright colour on the diesel's key when a household has one of each. So mark it.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the petrol pump. It sounds daft and it works.
- Whilst you're thinking about something else, this is an easy mistake to make — so put your phone away.
- Some diesels come with a filler built to reject a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump.
- The moment you realise, stop: less petrol in your tank makes a weaker mixture. What to do next doesn't change, though — still do not start the vehicle.
Petrol already in a diesel in West Field? Start here
Short and simple, then, is the order of things. Don't crank it, and don't turn the ignition on. If you're still at the forecourt — Asda or anywhere else — ask the staff to help you roll it away from the petrol pump. Next, 0333 366 0103. We will ask what was put in, about how much, and if it's been run.
If it was AdBlue and not petrol, say so. That's a different issue — corrosion and deposits instead of lost protection — and it has its own page for West Field.
One petrol in a diesel task around West Field costs more than another. Why?
There's no honest single price for this, because the four situations above are four different tasks. Which of them you are in is chiefly what shifts the cost. Two things come after that: the petrol that got in as a share of what your tank takes, then the spot your car is in and whether a technician can reach it safely.
What got in, how much, and whether it's run — three questions we ask before costing, not after, for exactly that reason. Their answers are what turn a range into one firm number.
About West Field
West Field is a suburban area located on the riverside in Nottinghamshire, with an elevation of 22 metres. West Field sits near the towns of South Retford, Ordsall, and Retford, and is approximately 16 miles from Doncaster. West Field has a population of around 4418 people and predominantly features terraced housing. West Field is also within a reasonable distance from major cities, being around 130 miles from London.
Across Nottinghamshire and around West Field: fuel drain cover
South Retford, Ordsall and Retford are among the places near West Field that the same teams work, answering petrol in diesel call-outs across West Field's DN postcode area. The vehicle doesn't need to move to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
In West Field and still at the petrol pump?
Then you're in the best place there is. Leave the car switched off, and ring.