--- title: Petrol in a Diesel Car Wincanton — Explained canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/wincanton-somerset/ location: Wincanton county: Somerset latitude: 51.056090 longitude: -2.411320 service: Petrol in a Diesel Car updated: 2026-10-13 --- # How Worried Should You Be? Petrol in a Diesel Car in Wincanton Probably less than you already are — provided nobody has started the car. Petrol sitting in a diesel tank does nothing to the motor till something draws it through the system — your ignition priming the pump, your starter, or driving on its own. So the honest answer to the first question everyone in Wincanton asks, "have I ruined it?", is normally no. To keep the vehicle like that, phone Petrol in Diesel then leave the motor switched off. Below, this page sets out what petrol really does inside a diesel, how far it may have got, and how to stop it happening to you again. ## Inside your engine: what petrol in a diesel really does Passing through an engine, diesel is doing two jobs at the same time. Oiling comes before burning; it does both. Extremely fine clearances are built into the injectors and the high-pressure fuel pump, and only the diesel flowing through keeps those surfaces from grinding together. The second task petrol does not do at all, and the first it does badly. Being less viscous than diesel, petrol strips out the protection a fuel system needs, so a pump running on the mixture to wear itself. It's also made to resist igniting under compression — the reverse of what a diesel needs — which is why you hear the knocking. Put those together and the shape of the issue is plain. The damage is done by circulation, not by contact. Petrol in a tank is a fuel fault. A pump that has been working on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with your fuel to the fuel injectors further on. ## How bad is petrol in a diesel? Four scenarios we see around Wincanton The best case there is: filled up, never started. Being at a forecourt is what makes this the case: elsewhere, the car has been driven there to begin with. With the petrol kept in that tank alone, it is cleared and flushed on the spot, and nothing more is needed. A moment's running, or merely the ignition on. Once primed, the system has pulled petrol out of the tank as far as the filter and your lines. Normally little more than emptying, flushing and seeing to your filter, so still straightforward. Those few miles on the road were the pump running on fuel weakened by petrol the whole way. Tank, lines, filter, then clean fuel run through the whole circuit: that is the work, and the way your car was driven counts as much as the distance. A school run to Our Lady of Mount Carmel Catholic Primary is one thing. A run as far as Wells, under 15 miles away, is a very different job. So is any distance on the M5, under 25 miles from Wincanton, where the motor has been running hard throughout. Driven on until it complained — knocking, smoke, a ragged idle, a dead throttle. The fuel isn't behaving like diesel any more, and your engine is telling you. Pull up wherever you are — the verge on North Street, a lay-by, a side street — and leave the car where it is. Lasting damage is very unusual if a vehicle is pulled over early, and the fuel drain and flush-through that still come first deal with it. ## What Wincanton people get told about petrol in a diesel — and the myths in it Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. A bigger tank of the same mix is all it gives, because topping up removes nothing. A diesel fuel system does not tolerate petrol by percentage in the way that guidance assumes. Not so: a newer diesel copes with a bit of petrol. If anything, the reverse. A current diesel sends its fuel through more precise components at higher pressure, which makes the lubrication matter more, not less. Myth: "If it starts and drives, there is no damage done." This is the one that fools motorists. Feed diesel to a petrol motor and it generally will not run, and so the driver stops — and the damage stops with them. Whilst the pump grinds, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Being able to run isn't proof of being fine. "A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct problem. It doesn't put back what petrol has thinned, and the petrol is still inside your tank after that. The next start draws petrol back round the pump out of the fuel lines and the fuel filter, where some of it sits after the engine has run. That is why draining the tank yourself does not leave you sorted — a myth. Emptying petrol into a can by the roadside is also truly risky. ## Why petrol in a diesel takes place at all On purpose? Never. Through carelessness? Seldom, if ever. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle generally will not go into a petrol motor at all. So the error runs one way. Habit and the vehicle getting out of step is when it happens. A new car, a hire car or a courtesy car. Households running one of each, petrol and diesel. A forecourt you know, but with its pumps laid out differently. A hurried fill en route to Templecombe with a train to catch. Precisely the moment it occurs: after years of driving petrol, someone fills a diesel Ford Focus for the first time. Add a back seat full of children, a phone call or rain, and habit takes over. ## Wincanton drivers: how to avoid petrol in a diesel next time - A green handle for unleaded and black for diesel is usual in the UK — but not on every forecourt. Trust the label on the petrol pump, not the colour. - In a car you don't know, look inside the flap over the filler or at the cap before your first fill: plenty of vehicles print the fuel there. - A coloured fob or a sticker on the diesel's key achieves more than any amount of intending to remember, for a home with one of each. - Before the nozzle leaves the pump the first time you fill a hired or new vehicle, say "diesel" aloud. Silly, yes, but it does the trick. - While you are thinking about something else, this is an easy mistake to make — so tuck your phone away. - Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to refuse a petrol nozzle, and add-on devices are available for the rest. Treat it as a backstop, then keep reading the pump. - Stop the moment you realise. Less petrol in that tank means a thinner mixture. It doesn't change what to do next, which is still not to fire it up. ## Petrol already in a diesel in Wincanton? Start here Then, there is only a short order of things. Do not switch the ignition on, and do not fire it up. Ask the attendants to help you roll it away from the pump if you're still on the forecourt, whether that is Morrisons or somewhere else. What was put in, about how much, and whether it has run: tell us that when you phone 0333 366 0103. If it was AdBlue and not petrol, say so. That's a separate issue — corrosion and deposits rather than lost lubrication — and it has its own page for Wincanton. ## Wincanton petrol in a diesel jobs: why one costs more than another Four separate tasks lie behind the four situations above — which is why there's no honest single price. What moves your cost is chiefly which of them you are in. Where the car is counts too, and whether our van can safely get to it, after the ratio of petrol to what your tank takes. Three questions come first, before any quote, rather than after — what got in, how much, has it run — and that is the reason. A range becomes a straight figure when those replies are in. ## About Wincanton and where it is Wincanton is a riverside town situated in Somerset, England, with a location that benefits from its proximity to major transport links. The town has a mix of residential and industrial areas, supporting a range of local businesses. Wincanton's position in southwest England makes it an important stop for travellers, and its scenic riverside setting adds to its charm. ## Fuel drain cover around Wincanton and across Somerset The teams answering petrol in diesel calls around Wincanton, in the BA postcode area, equally work the locations around it, Shadwell, Verrington and Bayford among them. A forecourt, a supermarket car park, a lay-by or your own drive are all places our engineers work, and your car doesn't need to move to us. ## In Wincanton and still at the petrol pump? In that case, you couldn't be in a better position. Keep it off. Ring.