--- title: Worried? Petrol in a Diesel Car Baltonsborough canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/baltonsborough-somerset/ location: Baltonsborough county: Somerset latitude: 51.111600 longitude: -2.650770 service: Petrol in a Diesel Car updated: 2026-10-10 --- # Petrol in a Diesel Car in Baltonsborough: How Worried Should You Be? Provided it hasn't been started, you can worry far less than you probably are. Everyone around Baltonsborough begins with "have I wrecked it?", and the honest answer is usually no: petrol resting in that tank of any diesel remains harmless till priming, cranking or driving pulls it into the fuel system. Keep it like that: leave the engine off and ring Petrol in Diesel. What petrol actually does to a diesel, how to judge how far it's gone, and how to stop it from happening again: that's the remainder of this page. ## The engine and petrol in a diesel: what happens Passing through a motor, diesel is doing two jobs at once. Oiling comes before burning; it does both. Very fine clearances are built into the fuel injectors and your high-pressure pump, and only the diesel running through stops their surfaces grinding together. The second job petrol doesn't do at all, and the first it does badly. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump running on that mixture wearing itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is where you hear the knocking. Put these together and the shape of the problem is plain. The damage is done by movement, not by contact. A tank with petrol in it is a fuel fault. The beginning of a mechanical problem is a pump that has been labouring on that petrol — and whatever a worn pump sheds moves on with the fuel to the injectors beyond it. ## How serious is petrol in a diesel? Four scenarios our engineers see in Baltonsborough Filled up, never started. The best case there can be. The petrol is inside the tank and only your tank, and the task is a drain and a flush where the car stands. This is the one scenario that can only truly take place on a forecourt, because anywhere else the vehicle has been driven to get there. Started for a second, or just the ignition on. Petrol has come out of the tank and got to the fuel filter and the fuel lines, because the fuel system has been primed. Usually nothing more than draining, purging and sorting your filter, and so still easy. Driven a few miles. Now the pump has spent these miles labouring on diluted fuel. How hard the vehicle was driven counts as much as how far, and this work takes in your tank, the lines, the fuel filter and clean fuel through the whole system. The school run to Baltonsborough Church of England VC Primary School is one thing. Very different again: a trip to Wells, under 10 miles away, or any mileage on the M5, under 15 miles from Baltonsborough, where your engine kept working hard. Clattering, a lumpy idle, smoke, a throttle gone soft: driven till it complained. The fuel isn't acting like diesel any more, and your engine is telling you. Pull up wherever you are — the verge on Chestnut Close, a lay-by, a side street — and leave it where it is. What goes first is still the drain and flush-through, and that sorts it out, with long-term damage very uncommon when a vehicle is stopped quickly. ## What Baltonsborough drivers get told about petrol in a diesel — and the stories in it Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up takes out nothing; it gives you a bigger tank of the same mixture. The idea behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong. Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. Smaller components and higher pressure are how a current diesel runs its fuel, and that makes the lubrication count more, not less. This is the one that catches people. Myth: "If it starts and drives, there's no damage done." Feed diesel to a petrol engine and it generally won't run, so the motorist stops — and the harm stops with them. While the pump grinds, a diesel fed petrol normally starts, idles and drives away as though nothing has happened. Fine and running aren't the same at all. "A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a different fault. None of what petrol weakened gets put back by it — and afterwards, your tank still holds that petrol. "Drain it yourself and you are sorted" — a myth, since after it's been running some petrol sits in the fuel filter and lines, ready to go straight back through your pump at the next start. It is also really risky to drain petrol into a can by the roadside. ## Why petrol in a diesel occurs so easily It is rarely carelessness, and nobody does it on purpose. A diesel nozzle mostly will not go into a petrol motor, yet the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error simple, and just in one direction. Routine and the vehicle falling out of step is when it occurs. Courtesy car, hire car, or a vehicle that's new. A household with one petrol and one diesel on the drive. The pumps in a different order on a familiar forecourt. A hurried fill on the way to Castle Cary with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: exactly when it occurs. Your hand repeats 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 Baltonsborough: avoiding petrol in a diesel - The label is what matters, so read the pump rather than the colour: in the UK unleaded handles are normally green and diesel black, yet not on every forecourt. - The first fill in a strange car is the time to check the filler flap — inside it, or on the cap, plenty of motors state which fuel to use. - 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. - Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump. It sounds silly and it works. - Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away and keep your mind on the pump. - A misfuel inhibitor helps, up to a point. Some diesels have a filler built to reject a petrol nozzle, and add-on devices exist for vehicles without one. They are a backstop, not a reason to stop checking the petrol pump. - As soon as you realise, stop: less petrol in that tank makes a weaker mixture. What to do next doesn't change, though — still do not fire it up. ## Already put petrol in a diesel around Baltonsborough? Then the order of things is short. Leave it unstarted, with your ignition switched off too. If you are still at the forecourt — Shell or anywhere else — ask the attendants to help you push the vehicle away from the pump. Ring 0333 366 0103 next, with three facts — the fuel, the rough volume, and whether it has run. If it was AdBlue and not petrol, say so. That's a separate fault — corrosion and deposits instead of lost protection — and it has its own page for Baltonsborough. ## What makes one Baltonsborough petrol in a diesel job cost more than the next Four different tasks lie behind the four situations above — which is why there is no fair single price. What shifts your cost is chiefly which of them you are in. Two things come after that: the petrol that was put in as a proportion of what your tank takes, then the place the vehicle is in and whether a technician can get to it safely. Before any quote, not after, come three queries: your fuel that got in, its quantity, and if it has run. That is why. The replies turn a range into a straight figure. ## About Baltonsborough itself Baltonsborough is a village in Somerset, situated on the banks of the River Brue at an elevation of around 21 metres. Baltonsborough lies near the city of Wells and is surrounded by other small settlements such as West Town and Ham Street. Baltonsborough has a population of approximately 694 people and is characterised by its predominantly detached housing stock. Baltonsborough is located in the South West region of England, about 112 miles from London. ## Fuel drain cover across Somerset, Baltonsborough included West Town, Ham Street and Coxbridge are among the places around Baltonsborough that the same vans work, answering petrol in diesel call-outs across Baltonsborough's BA postcode area. We drain wherever the vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us. ## In Baltonsborough and still at the pump? The best position there is, then — that's where you are. Call, and keep it switched off.