--- title: Gunness: Petrol in a Diesel Car, Explained canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/gunness-lincolnshire/ location: Gunness county: Lincolnshire latitude: 53.590730 longitude: -0.728270 service: Petrol in a Diesel Car updated: 2026-10-23 --- # How Worried Should You Be? Petrol in a Diesel Car in Gunness Provided it has not been started, you can worry far less than you likely are. "Have I ruined it?" is the first thing everyone in Gunness asks, and the truthful answer is usually no, since petrol left in a diesel tank harms nothing till it is drawn through the system — by ignition priming, by your starter, or by being driven. Keep it that way: leave your motor off then call Petrol in Diesel. The remainder of this page covers what petrol actually 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? Two tasks fall to diesel on its route round a motor. It ignites, and before it ignites it lubricates. The high-pressure pump and your injectors are built to extremely fine tolerances, and the diesel passing through them is what keeps those surfaces from wearing down against one another. The second task petrol doesn't do at all, and the first it does poorly. Being less viscous than diesel, petrol strips out the protection a fuel system needs, leaving a pump running on the mixture wearing itself. It is also made to resist igniting under compression — the reverse of what a diesel needs — which is why you get the clattering. The shape of the issue is plain when you put those together. It's circulation that causes the damage, not contact. Petrol in the tank is a fuel issue. Whatever a worn pump sheds goes on, carried by the fuel, into the fuel injectors further along, which is why a pump that has been working on that petrol is where a mechanical issue begins. ## Four situations our engineers see in Gunness: how bad is petrol in a diesel? Fuelled, and not started: nothing beats it. Being at a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With the petrol held inside that tank alone, it is drained and cleaned on the spot, and nothing more is needed. Started for a moment, or only your ignition on. With your system primed, your lines and filter already contain petrol that came from the tank. That is generally still a straightforward task — a drain, a flush, and your filter seen to. Driven a few miles. Now the pump has spent these miles working on diluted fuel. Distance is only half of that; how hard it was driven counts just as much. Either way the work runs to the tank, the lines, the filter and fresh fuel through the whole system. Short trips, like the school run to Gunness and Burringham Church of England Primary School, are one matter. Any distance on the A1077(M), under 3 miles from Gunness, means the engine working hard throughout, and a run to Doncaster, under 25 miles away, makes a very different job as well. It protested, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone uneven. That's the motor telling you its fuel no longer is behaving like diesel. Stop wherever you are — the verge on Station Road, a lay-by, a side street — and leave it there. Long-term damage is very uncommon when a car is stopped soon, and the fuel drain and flush that still go first deal with it. ## Petrol in a diesel stories Gunness motorists hear "Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing is removed when you top up — your tank just holds more of the same mixture. The assumption behind the guidance — that diesel fuel systems accept petrol by percentage — is wrong. Myth: a newer diesel copes with a bit of petrol. If anything, the reverse. A newer diesel sends its fuel through finer parts at higher pressure, which makes the protection matter more, not less. This is the one that fools drivers. Myth: "If it starts and drives, there is no damage done." Feed diesel to a petrol motor and it generally will not run, so the motorist 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 will; meanwhile the pump wears. Being able to run is not proof of being fine. An outdated fix for a separate issue lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." What petrol has thinned stays diluted, and that petrol remains in your tank anyway. The next start sends petrol back round the pump from your lines and the filter, where some of that ends up once the engine has run. That is why a DIY tank drain does not sort it — a myth. Draining petrol into a can at the kerbside is also genuinely dangerous. ## How does petrol in a diesel take place? No one does it on purpose, and it is rarely carelessness. A diesel nozzle generally will not go into a petrol car, yet the slimmer petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake straightforward, and only in one direction. Habit and the car falling out of step is when it takes place. Courtesy car, hire car, or a car that's brand new. One petrol and one diesel on the driveway of the same household. Your normal forecourt, its pumps now in a different order. A hurried fill en route to Althorpe with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist accustomed to petrol: exactly when it happens. Add rain, a phone call or a back seat full of kids, and your hand repeats what it has always done. ## Preventing petrol in a diesel next time you fill up in Gunness - The label is what matters, and so read the petrol pump rather than the colour: in the UK unleaded handles are normally green and diesel black, but not on each forecourt. - Check the filler flap. Many motors state the fuel inside the flap or on the cap. Look at it on your first fill in any car you do not know. - A coloured fob or a sticker on your diesel's key achieves 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. - Mistakes like this are straightforward to make while 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 block a petrol nozzle, and add-on devices are available for vehicles without one. They are a safety net, not a reason to stop reading the pump. - Stop the moment you notice. Less petrol in your tank means a weaker blend. It does not change what to do next, which is still not to start the vehicle. ## Petrol already in a diesel in Gunness? Start here Short and simple, then, is the order of things. Do not turn the ignition on, and don't start it. The attendants on the forecourt — whether at Tesco itself or wherever you filled up — will usually help push it clear of the petrol pump if you ask. What was put in, about how much, and whether it's run: tell us those when you call 0333 366 0103. AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a different problem — Gunness has a page all for it. ## What makes one Gunness petrol in a diesel task cost more than the next There is no fair single quote for this, since the four scenarios above are four separate tasks. Chiefly, your cost moves with which one you are in. Beyond that it is the share — how much petrol was put in against how much that tank holds — and then where the vehicle is and whether a technician can reach it safely. That is why our technicians 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 the replies are in. ## About Gunness and its setting Gunness is a small village in North Lincolnshire, situated on the banks of the River Trent at a low elevation of around 6 metres. Gunness lies near the villages of Keadby, Burringham, and Althorpe, and is approximately 17 miles from the city of Doncaster. Gunness has a population of around 556 people, with a predominance of semi-detached housing. Gunness is located in a rural area, with the nearest major city being Doncaster to the west. ## Fuel drain cover across Lincolnshire, Gunness included Petrol in diesel jobs around Gunness — part of the DN postcode area — go to vans that likewise cover the places around it, Keadby, Burringham and Althorpe included. Our engineers drain where the vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us. ## In Gunness and still at the pump? In that case, you couldn't be in a better place. Turned off it remains; then call.