--- title: Worried? Petrol in a Diesel Car Epworth canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/epworth-lincolnshire/ location: Epworth county: Lincolnshire latitude: 53.525610 longitude: -0.821440 service: Petrol in a Diesel Car updated: 2026-10-19 --- # Epworth: Petrol in a Diesel Car? How Worried to Be Likely less than you are now — as long as no one has started it. Petrol resting in a diesel tank does nothing to the motor until something draws it through your fuel system — your ignition priming the pump, the starter, or driving itself. So the fair answer to the first question anyone in Epworth asks, "have I wrecked it?", is generally no. Leave the motor off and phone Petrol in Diesel — that keeps it like that. The remainder of this page sets out what petrol really does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you again. ## Petrol in a diesel: what does it do to your engine? Passing through a motor, diesel is doing two things at the same time. It ignites, and before it combusts it lubricates. Designed to very fine gaps, the fuel injectors and the pump depend on the diesel moving through them to keep their surfaces from wearing against one another. Badly at the first, not at all at the second: that is petrol. The knocking comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips out the lubrication the system depends on, and any pump working on that mixture is wearing itself. Combined, those make the shape of the issue plain. The damage is done by movement, not by contact. Where the petrol is only inside the tank, it is an issue of fuel, nothing more. The start of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with your fuel to the fuel injectors beyond it. ## How bad is petrol in a diesel? Four scenarios our technicians see in Epworth Filled up, and not started: no case is better. That petrol is in your tank and just the tank, and the job is a drain and a flush where the vehicle sits. This is the one situation that can only really take place at a forecourt, as anywhere else your car has been driven to get there. The ignition switched on, or a short start. Once primed, your system has drawn petrol from your tank up to the filter and the lines. Still normally simple: drain, flush, and the fuel filter seen to. Your pump has worked a couple of miles on thinned fuel — that is what driving it meant. Tank, lines, filter, then clean fuel put through the whole system: that's this work, and the way the vehicle was driven matters as much as the miles. The school run to Epworth Primary Academy is one thing. Getting as far as Doncaster, under 15 miles away, makes a very different job — as does any miles on the M180, under 3 miles from Epworth, with the motor labouring hard the whole time. It protested, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone ragged. That's the motor telling you its fuel no longer is acting like diesel. Pull up on the spot — on the verge on Albion Hill, at the kerb, down a side road — and do not move it. A car pulled over soon very rarely has long-term damage, since the fuel drain and the flush-through, which still go first, deal with it. ## What Epworth 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 will be fine." It will not. Nothing comes out when you top up — the tank simply holds more of the same mixture. The assumption behind that advice — that diesel fuel systems accept petrol by percentage — is wrong. If anything, the reverse is true. Myth: "A modern diesel can cope with a bit of petrol." Protection matters more on newer diesels, not less, because their fuel passes through finer components at higher pressure. Myth: "If it starts and drives, there is no harm done." This is the one that fools motorists. Feed diesel to a petrol engine and it generally won't run, and so the motorist stops — and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile your pump grinds. Running is not the same as fine. "A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a separate issue. It does not put back what petrol has thinned, and the petrol is still in your tank later on. The next start draws petrol back round the pump out of your lines and your filter, where some of it ends up once the engine has run. That's why draining the tank yourself does not sort it — a myth. It's also truly risky to drain petrol into a can by the kerbside. ## How it happens: petrol in a diesel Nobody does it on purpose, and it is rarely carelessness. The petrol nozzle is the narrower of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol motor at all. The forecourt makes it easy, and the error runs one way. It happens when habit and the vehicle stop matching. Courtesy car, hire car, or a vehicle that's new. A household with one petrol and one diesel on the driveway. Your normal forecourt, its pumps suddenly in a different order. Rushing for a train at Crowle and fuelling up en route. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is exactly the moment it takes place. Throw in a back seat full of kids, a phone call or rain, and habit wins. ## Epworth drivers: how to avoid petrol in a diesel next time - The label is what matters, and so read the pump instead of the colour: in the UK unleaded handles are normally green and diesel black, but not on each forecourt. - The first fill in an unfamiliar vehicle is the time to check your filler flap — inside it, or on the cap, plenty of cars state which fuel they take. - A coloured fob or a sticker on the diesel's key achieves more than any amount of meaning to remember, in a household with one of each. - Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It seems daft and it does the trick. - Tuck the phone away. This is an easy mistake to make while you are thinking about something else. - Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to block a petrol nozzle, and aftermarket devices are available for the remainder. Treat it as a safety net, and keep checking the petrol pump. - Noticing it halfway? Stop there and then. A thinner blend results from less petrol in your tank, yet the next step remains the same: do not fire it up. ## Petrol already in a diesel around Epworth? Begin here Short and simple, then, is the order of things. Starting it is out, and so is switching on the ignition. Ask the staff to help you push it away from the pump if you are still on the forecourt, whether that's the nearest petrol station or anywhere else. Next, 0333 366 0103. We'll ask what got in, about how much, and if it has been run. If it was AdBlue and not petrol, say so. That's a separate problem — corrosion and deposits rather than lost protection — and it has its own page for Epworth. ## Epworth petrol in a diesel tasks: why one costs more than another The four scenarios above are four separate tasks, so no single quote for this would be honest. The scenario itself does most of the work of moving the cost. Next it's the proportion — how much petrol was put in against how much your tank takes — and then where the vehicle is and whether our van can get to it safely. Before any quote, not after, we ask three queries: your fuel that was put in, the volume, and if it's run. That is why. The replies turn a range into a straight figure. ## About Epworth itself Epworth is a small town in the Isle of Axholme area of Lincolnshire, situated inland at an elevation of around 18 metres. Epworth lies approximately 12.8 miles from Doncaster and 142.5 miles from London, with nearby places including Low Burnham and Epworth Turbary. Epworth has a population of around 3390 people, predominantly living in detached housing. ## Fuel drain cover across Lincolnshire, Epworth included Petrol in diesel call-outs in Epworth — part of the DN postcode area — go to teams that likewise cover the places around it, Low Burnham, Epworth Turbary and Church Town among them. A forecourt, a supermarket car park, a lay-by or your own drive are all spots our engineers work, and the car doesn't need to come to us. ## Epworth: still at the petrol pump? The best spot there is, then — that is where you are. Turned off it remains; then phone.