--- title: Explained: Petrol in a Diesel Car Ravelston canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/ravelston-city-of-edinburgh/ location: Ravelston county: City of Edinburgh latitude: 55.950520 longitude: -3.248080 service: Petrol in a Diesel Car updated: 2026-10-03 --- # Should You Worry? Petrol in a Diesel Car in Ravelston Not started? Then less worried than you probably are. Everyone in Ravelston starts with "have I wrecked it?", and the honest answer is normally no: petrol left inside the tank of any diesel stays harmless till priming, cranking or driving draws it into the fuel system. Leave the motor off then call Petrol in Diesel — that is how you keep it like that. The remainder of this page explains what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you a second time. ## What petrol in a diesel does to the motor Passing through a motor, diesel is doing two things at the same time. Before it burns, it lubricates — and then it ignites. Extremely fine tolerances are built into your injectors and your high-pressure pump, and just the diesel flowing through stops those surfaces grinding together. The second task petrol doesn't do at all, and the first it does badly. It's thinner than diesel and takes away the lubrication the fuel system depends on, and so a pump running on a petrol mixture is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the clattering comes from. The shape of the problem is plain once you put those together. The harm is done by circulation, not by contact. All a tank with petrol in it amounts to is a fuel problem. Whatever a worn pump sheds goes on, carried by the fuel, into your injectors further along, which is why a pump that has been working on the petrol is where a mechanical problem starts. ## Ravelston, petrol in a diesel: four situations, from mild to serious Fuelled up, not once started. The best case there can be. Just the tank has petrol in it, and so the job is emptying the tank and flushing your system where the car stands. This situation can only really take place on a forecourt: anywhere else, the vehicle got there by being driven. A moment's running, or merely your ignition on. Once primed, your system has pulled petrol out of your tank up to the filter and the lines. Usually little more than draining, cleaning and sorting the filter, and so still straightforward. Those few miles on the road were your pump running on fuel diluted by petrol the whole way. How hard the vehicle was driven matters as much as how far, and this work covers the tank, your lines, the fuel filter and clean fuel through the entire system. Short trips, such as the school run to the local primary school, are one matter. A run as far as Edinburgh, under 3 miles away, is a very different job. So is any miles on the M8, under 5 miles from Ravelston, where your engine has been working hard throughout. Driven on until it protested — clattering, smoke, a ragged idle, a soft throttle. That's your engine telling you its fuel has stopped behaving like diesel. Pull up wherever you are — the verge on Craigleith Rise, a lay-by, a side street — then leave the car where it is. Lasting damage is very uncommon if a car is stopped quickly, and the fuel drain and flush-through that still go first sort it out. ## Ravelston people and that petrol in a diesel stories they hear Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing is removed by topping up — you are left with a bigger tank, still the same mix. Percentage is not how a diesel fuel system tolerates petrol, whatever that advice assumes. If anything, the opposite holds. Myth: "A modern diesel can cope with a bit of petrol." At higher pressure, through finer components: that is how a newer diesel handles its fuel, and so the lubrication matters for more, not less. One myth that catches motorists off guard: if it starts and drives, it must be unharmed. Any petrol engine fed diesel generally won't run, so the motorist stops and the harm stops with them. Feed petrol to a diesel and it normally fires up, idles and pulls away as if nothing happened — all while its pump is wearing. Fine and running are not the same thing. Not so: a two-stroke additive lets you to drive home. It was an old workaround, supposed for another fault. None of what petrol diluted gets put back by it — and afterwards, that tank still holds that petrol. The next start sends petrol back round the pump out of your lines and the filter, where some of that ends up after your engine has run. That is why draining your tank yourself does not sort it — a myth. Clearing petrol into a can by the roadside is also truly risky. ## How does petrol in a diesel take place? No one does it on purpose, and it is seldom carelessness. The petrol nozzle is the smaller of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol car at all. The forecourt makes it simple, and the mistake runs one way. The moment routine stops matching your car is the moment it takes place. A new motor, a hire car or a courtesy car. A household with one petrol and one diesel on the driveway. A forecourt you know, but with its pumps laid out differently. Rushing for a train at Haymarket and fuelling up en route. A new-to-you diesel Renault Megane, its first fuelling, and a driver used to petrol: exactly when it happens. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of children. ## Next time you fill up around Ravelston: preventing petrol in a diesel - Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Read the pump's label; the colour is just a hint. - Inspect the filler flap. Many vehicles state the fuel type inside the flap or on the cap. Look at it on your first fill in a motor you do not know. - Mark your key. In a house with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember. - It seems silly and it works: on the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump. - While you're thinking about something else, this is an easy mistake to make — so put the phone away. - Up to a point, a misfuel inhibitor helps: some diesels have a filler built to refuse a petrol nozzle, and aftermarket devices are available for the rest. Count it as a safety net, then keep reading the petrol pump. - Spotting it halfway? Stop at once. A weaker blend follows from less petrol in your tank, yet your next step remains the same: do not crank it. ## Petrol already in a diesel around Ravelston? Begin here Short and simple, then, is the order of things. Do not turn your ignition on, and don't start it. Yet on the forecourt, at Esso or anywhere else? Ask the staff to help you push the car clear of the pump. Then call 0333 366 0103 and tell us what went in, about how much, and whether it has run. Corrosion and deposits form the trouble with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and read its own Ravelston page. ## What makes one Ravelston petrol in a diesel job cost more than the next Four separate jobs sit behind the four scenarios above — which is why there's no honest single quote. What moves your cost is mostly which of them you are in. Where the vehicle is matters too, and whether a van can safely reach it, after the ratio of petrol to what your tank takes. What was put in, how much, and if it's run — three queries we ask before costing, not after, for exactly that reason. Given those replies, there is a straight figure rather than a range. ## About Ravelston, briefly Ravelston is a suburban area in the City of Edinburgh, situated approximately 2.3 miles west of Edinburgh's city centre. Ravelston occupies a coastal setting, with its elevation at around 69 metres above sea level, and is surrounded by nearby places such as Murrayfield and Roseburn. Ravelston is predominantly composed of flat-type housing, which accommodates its population of around 3354 residents. ## Fuel drain cover around Ravelston and across City of Edinburgh Murrayfield, Saughtonhall and Roseburn are among the places near Ravelston that the same teams work, answering petrol in diesel jobs across Ravelston's EH postcode area. No need to move your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots we drain. ## Ravelston: still at the petrol pump? Then you are in the best spot there is. Keep the car turned off, then ring.