--- title: Petrol in a Diesel Car Fishertown — Explained canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/fishertown-highland/ location: Fishertown county: Highland latitude: 57.587790 longitude: -3.863550 service: Petrol in a Diesel Car updated: 2026-10-17 --- # Should You Worry? Petrol in a Diesel Car in Fishertown Less than you likely are, if it hasn't been started. Till your ignition primes your pump, your starter turns, or your car is driven, petrol in a diesel tank just waits there and does no harm. Which makes the honest reply to the first Fishertown question — "have I ruined it?" — normally no. Keep it like that: leave your engine off and call Petrol in Diesel. The remainder of this page sets out what petrol actually does to a diesel, how to judge 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 your engine Diesel does two jobs on its way through an engine. Before it ignites, it protects — and then it burns. What stops the surfaces inside the high-pressure pump and your injectors from wearing down against one another is the diesel flowing through them — they are made to extremely fine clearances. Petrol does the first job poorly and the second not at all. It's thinner than diesel and removes the lubrication the system hinges on, and so a pump running on a petrol blend is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That is where the clattering comes from. Seen together, they show the shape the issue takes. Not contact but circulation is what causes the damage. All a tank with petrol in it amounts to is a fuel issue. Whatever a worn pump sheds goes on, borne by your fuel, into the injectors downstream, which is why a pump that has been working on that petrol is where a mechanical problem starts. ## Fishertown, petrol in a diesel: four cases, from mild to serious Filled up, and not started: no case is better. The petrol is in your tank and only the tank, and the task is a drain and a flush where the vehicle stands. This is the one scenario that can only truly occur on a forecourt, since anywhere else the car has been driven to get there. A brief spell of running, or merely the ignition on. Once primed, the fuel system has drawn petrol out of your tank as far as the filter and your lines. Drain, flush, see to the filter: still normally simple. Those few miles driven were the pump working on fuel diluted by petrol throughout. The work is the tank, your lines, the filter and fresh fuel through the entire circuit, and how hard the car was driven counts as much as how far. Driving the kids to the local primary school is one kind of trip. Getting as far as Inverness, under 25 miles away, makes a very different job — as does any distance on the M90, over 50 miles from Fishertown, with the engine working hard the whole time. It complained, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone ragged. The engine is telling you your fuel is no longer acting like diesel. Leave it wherever it stops: a lay-by, a quiet street, the verge on Society Street. The fuel drain and flush still go first, and they sort it out: when a car is stopped quickly, lasting damage is very unusual. ## Fishertown drivers and the petrol in a diesel stories they hear "Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Topping up takes out nothing; it gives you a bigger tank of the same mixture. Percentage isn't how a diesel fuel system tolerates petrol, whatever that advice supposes. If anything, the opposite is true. Myth: "A modern diesel can cope with a bit of petrol." A newer diesel sends its fuel through more precise parts at higher pressure, which makes the lubrication count more, not less. "It starts, it drives, so no harm done" — the myth that trips up more people than any other. Any petrol motor fed diesel generally will not run, so the driver stops and the harm stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile your pump wears. Running is not the same as fine. Myth: a two-stroke additive lets you to drive home. It is an old workaround, meant for another fault. None of what petrol weakened is put back by it — and later, the tank still contains the petrol. "Drain it yourself and you are sorted" — a myth, since after it has been running some petrol sits in your filter and lines, waiting to go right back through your pump on the next start. It's also genuinely risky to drain petrol into a can by the kerbside. ## How it happens: petrol in a diesel No one does it on purpose, and it is seldom carelessness. The forecourt makes it easy: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle generally won't go into a petrol car at all. So the error runs one way. It happens when habit and the vehicle stop matching. Hire cars, courtesy cars, and motors that are new to you. Two motors on one drive, one petrol, one diesel. A forecourt you know, only with its pumps laid out differently. A train to catch, and a hurried fill en route to Nairn. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that is when. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of kids. ## Fishertown motorists: how to avoid petrol in a diesel next time - A green handle for unleaded and black for diesel is normal in the UK — but not on each forecourt. Go by the label on the pump, not the colour. - The first fill in a strange vehicle is the time to check your filler flap — on it, or on the cap, many cars state the fuel to use. - A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, for a house with one of each. - Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It sounds daft and it does the trick. - Tuck your phone away. This is an easy mistake to make while you're thinking about something else. - A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject a petrol nozzle, and add-on devices are available for vehicles without one. They are a safety net, not a reason to stop checking the petrol pump. - Less petrol means a thinner blend, so stop as soon as you realise — while remembering that your next step is unchanged. It's still not to fire it up. ## Put petrol in a diesel around Fishertown already? Then the order of things is brief. Do not switch the ignition on, and do not crank it. The attendants on the forecourt — whether at Sainsbury's itself or wherever you filled up — will usually help roll it away from the petrol pump if you ask. Then ring 0333 366 0103 and tell us what went in, about how much, and whether it's run. AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a separate fault — Fishertown has a page all for it. ## Why one petrol in a diesel job in Fishertown costs more than another A fair single quote doesn't exist here: four scenarios, four separate jobs. Chiefly, the cost moves with which situation you are in. Beyond that it's the share — how much petrol went in against how much your tank takes — and then where the car is and whether our van can get to it safely. That's why our engineers ask three queries before costing rather than after: what was put in, how much, and if it has run. Given those replies, you get a straight figure rather than a range. ## About Fishertown and its setting Fishertown is a coastal suburban area in the Highland county of Scotland, situated near the city of Inverness. Fishertown lies at a low elevation of around 5 metres, close to the Moray Firth coastline. Fishertown is part of a larger network of communities including Nairn, Kingsteps, and Auldearn, and is characterized by its predominantly flat-type housing. ## Fuel drain cover around Fishertown and across Highland Our vans answering petrol in diesel calls in Fishertown, in the IV postcode area, also work the places around it, Nairn, Kingsteps and Auldearn included. We drain where your vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us. ## Fishertown: still at the petrol pump? In that case, you couldn't be in a better place. Keep it off. Phone.