--- title: Petrol in a Diesel Car West Linton — Explained canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/west-linton-scottish-borders/ location: West Linton county: Scottish Borders latitude: 55.751740 longitude: -3.355690 service: Petrol in a Diesel Car updated: 2026-10-23 --- # Should You Worry? Petrol in a Diesel Car in West Linton Probably less than you are now — as long as nobody has started it. Everyone in West Linton starts with "have I ruined it?", and the fair answer is normally no: petrol left in your tank of any diesel remains harmless till priming, cranking or driving draws it into the fuel system. Petrol in Diesel is who to call, with your engine kept off, and so it stays that way. 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 doesn't happen to you a second time. ## What petrol in a diesel does to the motor On its way through an engine, diesel does two jobs. Before it combusts, it lubricates — and then it ignites. The high-pressure fuel pump and the fuel injectors are designed to extremely fine tolerances, and your diesel passing through them is what stops those surfaces from wearing down against each other. Petrol does the first task badly and the second not at all. The knocking comes from petrol being made 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 away the protection your system rests on, and any pump working on such a blend is wearing itself. Taken together, they show the shape the issue takes. It's circulation that does the harm, not contact. Any tank with petrol in it is a fuel issue. Once your pump has been labouring on that petrol, a mechanical issue has begun: anything shed by a pump that is wearing down travels downstream to the fuel injectors with the fuel. ## How bad is petrol in a diesel? Four scenarios our engineers see in West Linton The best case there is: filled up, never started. Only that tank has petrol in it, so the job is draining the tank and flushing the system where the car sits. This scenario can only really occur on a forecourt: anywhere else, your car got there by being driven. Ignition on, or started for a moment. Petrol has come out of that tank and got to the fuel filter and your lines, since the fuel system has been primed. Normally nothing more than clearing, rinsing and seeing to the filter, so still straightforward. Your pump now spent a few miles on thinned fuel — that is what driving the car meant. Tank, lines, filter, then fresh fuel put through the whole circuit: that's the work, and the way the car was driven matters as much as the distance. On the school run to the local primary school, the miles is short. Any mileage on the M8, under 15 miles from West Linton, means the motor working hard throughout, and a run to Edinburgh, under 25 miles away, is a very different job as well. Driven until it complained. Clattering, a ragged idle, smoke, a throttle that has gone soft. The fuel isn't behaving like diesel any more, and your engine is saying so. Stop wherever you are — the verge on Mowbrays Slap, a lay-by, a side street — then leave it where it is. What goes first is still the drain and flush-through, and that deals with it, with lasting damage very unusual if a vehicle is stopped quickly. ## What West Linton motorists get told about petrol in a diesel — and the myths in it "Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Nothing is removed by topping up — you are left with a bigger tank, still the same mix. The assumption behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong. Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. More precise components and higher pressure are how a newer diesel runs its fuel, and that makes the lubrication count more, not less. "It starts, it drives, so there is no harm" — the myth that trips up more people than any other. Feed diesel to a petrol motor and it generally won't run, and so the driver stops — and the damage stops with them. Feed petrol to a diesel and it generally starts, ticks over and drives away as if nothing has happened — all the while its pump wears. Running is not the same as fine. An old fix for a separate fault lies behind this one. Myth: "Add some two-stroke oil and drive it home." It doesn't put back what petrol has weakened, and the petrol is still inside your tank later. Myth: "Drain that tank yourself and you're sorted." Once the motor has run, some of the petrol is no longer in that tank: it's in the filter and the lines, and it goes straight back through your pump on the next start. Also, a can of petrol drained at the kerbside is truly risky. ## Petrol in a diesel: how does it happen? It's seldom carelessness, and no one does it on purpose. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol car at all. The forecourt makes it simple, and the mistake runs one way. It takes place when habit and the vehicle stop matching. A new car, a hire car or a courtesy car. A household with one petrol and one diesel on the driveway. A familiar forecourt with the pumps in a different order. Racing for a train outside Kirknewton and fuelling up en route. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver used 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. ## How to avoid petrol in a diesel at your next fill-up around West Linton - Green for unleaded and black for diesel is normal in the UK — but not on every forecourt. Go by the label on the petrol pump, not the colour. - In a motor you do not know, look inside the flap over your filler or at the cap before the first fill: plenty of cars state the fuel there. - Label your key. In a home 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 petrol pump. It sounds daft and it does the trick. - Mistakes like this are straightforward to make whilst your mind is on something else, so the phone goes away. - A misfuel inhibitor helps, up to a point. Some diesels have a filler built to reject a petrol nozzle, and add-on devices are available for motors without one. They are a backstop, not a reason to stop reading the petrol pump. - Spotting it mid-fill? Stop at once. A thinner mix results from less petrol inside the tank, yet the next stage stays the same: do not crank it. ## West Linton: already put petrol in a diesel? Short and simple, then, is the order of things. Don't turn the ignition on, and do not start it. If you're still at the forecourt — the nearest petrol station or anywhere else — ask the staff to help you push it clear of the pump. Ring 0333 366 0103 next, with three answers — the fuel, the approximate quantity, and if it has run. Corrosion and deposits are the issue with AdBlue, where petrol means lost lubrication. So if it was AdBlue, say so — and see its own West Linton page. ## Why one petrol in a diesel job in West Linton costs more than another The four situations above are four separate tasks, so no single price for this would be honest. The situation itself does most of the work of moving the cost. Two things follow that: the petrol that got in as a proportion of what that tank holds, then the place the vehicle is in and whether a technician can get to it safely. What was put in, how much, and whether it has run — three questions our engineers ask before quoting, not after, for precisely that reason. The answers change a range into a straight figure. ## About West Linton, for a moment West Linton is a village situated in the Scottish Borders, on the banks of the River Lyne at an elevation of 236 metres. West Linton lies approximately 15 miles south-west of Edinburgh and is characterised by its predominantly detached housing stock. West Linton is surrounded by rolling countryside and nearby places such as Bogs Bank, Halmyre Mains, and Romannobridge. West Linton has a population of around 1593 residents. ## West Linton and Scottish Borders: where our fuel drain cover runs Petrol in diesel jobs in West Linton — part of the EH postcode area — go to teams that also cover the spots round it, Bogs Bank, Halmyre Mains and Romannobridge included. You need not move your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places we drain. ## Still at the pump around West Linton? Then you are in the best spot there is. Ring, and leave it switched off.