--- title: Port na Craig: Petrol in a Diesel Car, Explained canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/port-na-craig-perth-and-kinross/ location: Port na Craig county: Perth and Kinross latitude: 56.699740 longitude: -3.733700 service: Petrol in a Diesel Car updated: 2026-10-21 --- # Should You Worry? Petrol in a Diesel Car in Port na Craig Provided it has not been started, worry far less than you likely are. Everyone around Port na Craig begins with "have I wrecked it?", and the fair answer is normally no: petrol left in your tank of any diesel remains harmless till priming, cranking or driving pulls it into your fuel system. Keep it that way: leave your motor off and phone Petrol in Diesel. Read on for three things: the effect petrol has inside a diesel engine, the clues of how far it has spread, and ways to make sure you never repeat it. ## What petrol in a diesel does to the engine On its way through an engine, diesel has two tasks. It burns, and before it combusts it protects. What keeps the surfaces inside your high-pressure pump and the injectors from wearing down against one another is your diesel passing through them — they are made to extremely fine gaps. The second task petrol doesn't do at all, and the first it does badly. A pump running on a petrol blend is wearing itself out, because petrol is runnier than diesel and takes away the protection your fuel system relies on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that's where the rattling starts. The shape of the problem is clear when you put those together. Not contact but movement is what causes the damage. A tank with petrol in it is a fuel fault. Whatever a worn pump sheds travels on, carried by the fuel, into your injectors downstream, which is why a pump that has worked on that petrol is where a mechanical problem begins. ## Four scenarios our technicians see in Port na Craig: how serious is petrol in a diesel? The best case there can be: filled up, not once started. On a forecourt, and really only there, that petrol is still confined to that tank — because anywhere else your car was driven to reach it. The task is emptying and cleaning on the spot. A brief spell of running, or merely your ignition on. Your system has been bled, and so petrol has left your tank and reached your filter and the lines. That is normally still a simple job — a drain, a flush, and your filter dealt with. Those few miles on the road meant the pump working on fuel diluted by petrol the whole way. How hard the car was driven counts as much as how far, and this work takes in your tank, your lines, the filter and fresh fuel through the entire circuit. Driving the children to the local primary school is one kind of trip. Very different once more: a run to Perth, under 25 miles away, or any miles on the M90, under 25 miles from Port na Craig, where your engine never stopped working hard. Rattling, an uneven idle, smoke, a throttle gone soft: driven till it complained. The fuel isn't acting like diesel any more, and your motor is telling you. Leave it wherever it has stopped: a lay-by, a side street, the verge on Tummel Crescent. Long-term damage is very rare when a car is pulled over quickly, and the drain and flush that still go first deal with it. ## What Port na Craig motorists get told about petrol in a diesel — and the stories in it It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." A bigger tank of the same mixture is all you get, since topping up takes out nothing. A diesel fuel system doesn't tolerate petrol by percentage in the way that advice supposes. If anything, the reverse is true. Myth: "A newer diesel can cope with a bit of petrol." A current diesel sends its fuel through smaller components at higher pressure, which makes the lubrication matter more, not less. One myth that catches drivers off guard: if it starts and drives, it must be unharmed. Diesel in a petrol motor normally means a motor that won't run: the driver stops, and so does the damage. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile the pump wears. Running isn't the same as fine. An old fix for a different issue is behind this one. Myth: "Add some two-stroke oil and drive the car home." None of what petrol weakened gets put back by it — and later, that tank still contains the petrol. The next start sends petrol back round the pump from the lines and the fuel filter, where some of that sits once your engine has been run. That's why a DIY tank drain does not leave you sorted — a myth. It is also genuinely risky to drain petrol into a can by the roadside. ## Why petrol in a diesel takes place so easily Carelessness is rarely the cause, and no one means to do it. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle generally won't go into a petrol motor at all. So the slip runs one way. It happens when habit and the car stop matching. A new vehicle, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. A forecourt you know, only with its pumps arranged differently. Filling up in a rush en route to Pitlochry, with a train to catch. Precisely the moment it takes place: after years of driving petrol, a driver fills a diesel Peugeot 308 for the first time. Add a back seat full of children, a phone call or rain, and the hand takes over. ## Port na Craig people: how to avoid petrol in a diesel next time - Check the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on each forecourt. The label is what matters. - Plenty of vehicles state the fuel type inside your filler flap or on the cap, so check there on your first fill in a motor you do not know. - One of each in the home? Mark your key to your diesel — a bright fob, a sticker — because intending to remember is not enough. - It sounds daft and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump. - Whilst you are thinking about something else, this is an easy mistake to make — so put your phone away. - A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to refuse a petrol nozzle, and add-on devices exist for motors without one. They are a safety net, not a reason to stop reading the petrol pump. - Stop the moment you notice. Less petrol inside that tank makes a weaker mix. It doesn't change what to do next, which is still not to fire it up. ## Already put petrol in a diesel around Port na Craig? The order of things is brief, then. Leave it unstarted, with your ignition switched off as well. Still on the forecourt, at BP or anywhere else? Ask the attendants to help you roll it away from the petrol pump. What went in, about how much, and if it has run: tell us those when you call 0333 366 0103. If it was AdBlue instead of petrol, say so. That's a separate problem — corrosion and deposits rather than lost protection — and it has its own page for Port na Craig. ## Port na Craig petrol in a diesel jobs: why one costs more than another There is no fair single price for this, since the four situations above are four different jobs. Mostly, your cost moves with which one you are in. Two things follow that: the petrol that went in as a proportion of what that tank holds, then the place your car is in and whether a van can reach it safely. That's why we ask three questions before costing rather than after: what got in, how much, and if it's run. A range becomes a straight figure when those replies are in. ## About Port na Craig Port na Craig is a suburban area situated on the shores of Loch Tummel in Perth and Kinross, with a mix of flat housing and scenic views. Port na Craig sits at an elevation of 85 metres, looking out across the loch and surrounding hills. Port na Craig is located near the towns of Pitlochry and Moulin, and is within commuting distance of Perth. Port na Craig has a population of around 950 residents. ## Port na Craig and Perth and Kinross: where our fuel drain cover runs Port na Craig rests in the PH postcode area, and the teams that answer petrol in diesel jobs there work the spots around it as well — Pitlochry, Moulin and Milton of Edradour among them. No need to move the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots where we work. ## At the petrol pump around Port na Craig, right now? The best place there is, then — that's where you are. Turned off it remains; then phone.