--- title: Petrol in a Diesel Car Wedmore — Explained canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/wedmore-somerset/ location: Wedmore county: Somerset latitude: 51.228080 longitude: -2.808940 service: Petrol in a Diesel Car updated: 2026-10-12 --- # Wedmore: Petrol in a Diesel Car? How Worried to Be Less than you probably are, provided it has not been started. "Have I wrecked it?" is the first question everyone around Wedmore asks, and the truthful answer is normally no, since petrol resting in a diesel tank hurts nothing until it's dragged through the fuel system — by ignition priming, by your starter, or by being driven. Keep it that way: leave the motor off then phone Petrol in Diesel. What petrol really does to a diesel, how to judge how far it's travelled, and how to keep it from happening again: that's the remainder of this page. ## Petrol in a diesel: what does it do to your engine? On its way through a motor, diesel has two jobs. Before it ignites, it protects — then it burns. Designed to very fine clearances, the fuel injectors and your pump rely on your diesel flowing through them to stop their surfaces wearing against one another. Badly at the first, not at all at the second: that's petrol. A pump working on a petrol mix is wearing itself out, since petrol is thinner than diesel and takes away the lubrication the fuel system relies on. Petrol is also made to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that's where the rattling comes. Seen together, they make clear what shape the trouble takes. Contact doesn't do the damage — movement does. Petrol in a tank is a fuel issue. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with the fuel to the injectors downstream. ## How bad is petrol in a diesel? Four situations our engineers see around Wedmore Fuelled but not once started — as good as it gets. The petrol is in that tank and only the tank, and the task is a drain and a flush where your car sits. This is the one situation that can only truly happen on a forecourt, as anywhere else your car has been driven to get there. The ignition switched on, or a brief start. Your system has been bled, and so petrol has left the tank and got to your filter and the lines. That's generally still a straightforward job — a drain, a flush, and the filter seen to. Some miles driven, and your pump has spent every one of them running on weakened fuel. The work is the tank, the fuel lines, your filter and fresh fuel through the whole system, and how hard the vehicle was driven matters as much as how far. A school run to Wedmore First School Academy is one thing. Very different a second time: a run to Wells, under 10 miles away, or some miles on the M5, under 10 miles from Wedmore, where the motor kept working hard. Clattering, an uneven idle, smoke, a throttle gone soft: driven until it complained. The fuel isn't behaving like diesel any more, and your engine is telling you. Whether it's the verge on The Borough, a lay-by or a side road, stop there then leave it. What comes first is still the drain and flush-through, and that takes care of it, with permanent damage very uncommon if a vehicle is pulled over early. ## What Wedmore motorists get told about petrol in a diesel — and the myths in it Myth: topping up to full with diesel makes it fine. It doesn't. Nothing is removed when you top up — your tank just carries more of the same mixture. Percentage isn't how a diesel fuel system copes with petrol, whatever that guidance assumes. Myth: "A newer diesel can cope with a bit of petrol." If anything, the reverse. At higher pressure, through smaller parts: that is how a newer diesel handles its fuel, and so the lubrication matters more, not less. One myth that catches motorists off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it generally will not run, so the motorist stops — and the harm stops with them. While your pump grinds, a diesel fed petrol normally starts, idles and drives away as though nothing has happened. Fine and running are not the same thing. Myth: a two-stroke additive makes it safe to drive home. It was an old fix, meant for another fault. It does not put back what petrol has thinned, and the petrol is still inside that tank later. Myth: "Drain the tank yourself and you're sorted." After the engine has run, some of the petrol is no longer in your tank: it is in your filter and the fuel lines, and it goes straight back through your pump at your next start. Besides, petrol emptied into a can by the road is truly dangerous. ## How petrol ends up: petrol in a diesel Carelessness is seldom the cause, and no one means to do it. A diesel nozzle generally won't go into a petrol vehicle, yet the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error easy, and just in that direction. When habit and your car stop matching, it takes place. Any vehicle that is new to you — hired, on loan as a courtesy car, or just bought. Households running one of each, petrol and diesel. A well-known forecourt with the pumps in a different order. Racing for a train at Highbridge & Burnham and fuelling up en route. Precisely the moment it takes place: after years of driving petrol, someone fills a diesel Renault Megane for the first time. Add a back seat full of children, a phone call or rain, and habit takes over. ## Preventing petrol in a diesel next time you fill up around Wedmore - Read the pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on each forecourt. The label is what matters. - Many cars state the fuel inside your filler flap or on the cap, and so check it on the first fill in any motor you don't know. - One of each in the household? Label your key to your diesel — a bright fob, a sticker — because meaning to remember isn't enough. - Before the nozzle comes off the pump the first time you fuel a hired or new motor, say "diesel" aloud. Silly, perhaps, yet it works. - Tuck the phone away. This is an easy mistake to make while you're thinking about something else. - Some diesels come with a filler designed to reject a petrol nozzle, and devices you can add exist for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the petrol pump. - Stop as soon as you notice. Less petrol in that tank means a thinner mixture. It does not change what to do next, which is still not to fire it up. ## Already put petrol in a diesel in Wedmore? The order of things is short, then. Never crank it, and do not turn your ignition on. Yet at the forecourt, at Murco or anywhere else? Ask the attendants to help you push the vehicle away from the pump. What got in, about how much, and if it's run: tell us that when you phone 0333 366 0103. AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a different issue — Wedmore has a page just for it. ## One petrol in a diesel job in Wedmore costs more than another. Why? There is no honest single quote for this, because the four situations above are four separate tasks. Which of them you are in is mostly what moves your cost. Where your car is matters too, and whether our van can safely reach it, after the share of petrol to what that tank takes. Three questions come first, before any quote, rather than after — what was put in, how much, has it run — and this is the reason. A range becomes a straight figure when the answers are in. ## About Wedmore, for a moment Wedmore is a village in Somerset, situated inland at an elevation of 17 metres, and is located near the city of Wells. Wedmore has a population of around 1082 people and is characterized by predominantly detached housing. Wedmore is close to several nearby places, including Sand, Latcham, and Cocklake, and is about 117 miles west of London. ## Fuel drain cover around Wedmore and across Somerset Petrol in diesel calls around Wedmore — part of the BS postcode area — go to teams that likewise cover the places around it, Sand, Latcham and Cocklake among them. No need to move your car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all locations where we work. ## In Wedmore and still at the pump? Then you're in the best spot there can be. Keep it off. Call.