--- title: Explained: Petrol in a Diesel Car Bowburn canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/bowburn-durham/ location: Bowburn county: Durham latitude: 54.735450 longitude: -1.527460 service: Petrol in a Diesel Car updated: 2026-10-20 --- # Bowburn: Petrol in a Diesel Car? How Worried to Be Far less than you likely are, if it has not been started. Petrol sitting in a diesel tank does nothing to the engine till something draws it through your fuel system — your ignition priming your pump, your starter, or the drive itself. So the fair answer to the first query everyone in Bowburn asks, "have I ruined it?", is normally no. To leave the car that way, call Petrol in Diesel and leave your motor alone. Keep reading for three things: the effect petrol has inside a diesel engine, the clues of how far it has got, and the way to make sure you never do it again. ## Petrol in a diesel: what does it do to the engine? Passing through an engine, diesel is doing two jobs at the same time. Before it burns, it lubricates — then it burns. Extremely fine gaps go into the fuel injectors and the high-pressure pump, and only your diesel flowing through stops those surfaces grinding together. Petrol does the first job badly and the second not at all. The rattling 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 runnier than diesel, it strips away the protection the fuel system depends on, and any pump running on such a mixture is wearing itself. The shape of the problem is plain once you put those together. The damage is done by circulation, not by contact. Any tank with petrol in it is a fuel issue. After the pump has been working on that petrol, a mechanical problem has started: anything shed by a pump that is grinding is carried downstream to your injectors with the fuel. ## How bad is petrol in a diesel? Four situations our technicians see in Bowburn Fuelled but never started — as good as it gets. Being on a forecourt is what makes this the case: elsewhere, your car has been driven there to begin with. With the petrol held in your tank alone, it is drained and cleaned on the spot, and nothing more is needed. A brief spell of running, or merely your ignition on. With your system primed, your lines and filter already hold petrol that has come from that tank. Normally little more than emptying, flushing and seeing to the filter, so still simple. Those few miles driven meant your pump labouring on fuel diluted by petrol throughout. The work is your tank, your lines, your filter and clean fuel through the whole system, and how hard your car was driven counts as much as how far. Driving the kids to Bowburn Primary School is one kind of trip. Very different once more: a run to Durham, under 5 miles away, or some mileage on the A1(M), under a mile from Bowburn, where the motor never stopped labouring hard. Driven till it complained. Rattling, an uneven idle, smoke, a throttle that has gone soft. That is your motor telling you its fuel has stopped behaving like diesel. Stop on the spot — on the verge on The Leazes, at the kerb, down a side road — and do not move it again. What goes first is still the drain and flush, and that deals with it, with lasting damage very unusual if a vehicle is pulled over quickly. ## What Bowburn drivers get told about petrol in a diesel — and the myths in it Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Topping up takes out nothing; it gives you a fuller tank of the same mix. That advice assumes a diesel fuel system handles petrol by percentage. It does not. Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. A current diesel runs its fuel through smaller components at higher pressure, which makes the protection count more, not less. One myth that catches motorists off guard: if it starts and drives, it must be unharmed. Diesel in a petrol motor generally means a motor that will not 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, as it usually will; meanwhile the pump wears. Running isn't the same as fine. "A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a different fault. The petrol is still in that tank afterwards, and whatever it has weakened is not put back. "Drain it yourself and you're sorted" — a myth, since after it's been running some petrol lies in the filter and lines, waiting to go straight back through the pump at your next start. Besides, petrol drained into a can by the road is truly dangerous. ## How it happens: petrol in a diesel A careless moment is seldom the cause, and nobody means to do it. A diesel nozzle mostly will not fit a petrol car, but the smaller petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake simple, and just in one direction. When routine and your car stop matching, it happens. Courtesy car, hire car, or a car that's brand new. Households running one of each, petrol and diesel. Your ordinary forecourt, its pumps now in a different order. Rushing for a train at Durham and filling up en route. The first fill-up in a diesel Renault Megane after years of driving petrol is exactly the moment it occurs. Throw in rain, a phone call or a back seat full of kids, and your hand repeats what it has always done. ## Bowburn motorists: how to prevent petrol in a diesel next time - Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most generally do. Check the petrol pump's label; the colour is just a clue. - Plenty of motors state the fuel type inside the filler flap or on the cap, so check it on your first fill in a vehicle you don't know. - A coloured fob or a sticker on the diesel's key achieves more than any amount of meaning to remember, for a home with one of each. - 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 pump. - Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away and keep your mind on the petrol pump. - Some diesels have a filler built to reject a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump. - The moment you notice, stop: less petrol in the tank means a thinner blend. What to do next doesn't change, though — still do not crank it. ## Petrol already in a diesel around Bowburn? Begin here The order of things is short, then. Don't turn the ignition on, and don't crank it. If you're still at the forecourt — Shell or anywhere else — ask the attendants to help you push the car away from the petrol pump. Next, 0333 366 0103. We'll ask what went in, about how much, and if it's been run. Say so if it was AdBlue instead of petrol: it's a separate fault, with its own page for Bowburn, since AdBlue brings corrosion and deposits rather than lost lubrication. ## One petrol in a diesel task in Bowburn costs more than another. Why? A fair single quote doesn't exist here: four scenarios, four separate tasks. Chiefly, the cost shifts with which one you are in. Two things follow that: the petrol that got in as a proportion of what your tank holds, then the spot the car is in and whether a van can reach it safely. Before any quote, not after, we ask three queries: your fuel that was put in, its quantity, and whether it's run. That's why. Those replies change a range into a straight figure. ## About Bowburn and its setting Bowburn is a village in County Durham, situated on the banks of a river at an elevation of 87 metres, approximately 3.7 miles from the city of Durham. Bowburn has a mix of housing types, but semi-detached homes are predominant, and its location near Old Quarrington, High Shincliffe, and Hett makes it a convenient residential area. Bowburn is part of the wider North East region, with London being around 230.5 miles to the south. Bowburn's riverside setting contributes to its scenic surroundings. ## Fuel drain cover around Bowburn and across Durham Bowburn waits in the DH postcode area, and the vans that answer petrol in diesel calls there work the spots near it as well — Old Quarrington, High Shincliffe and Hett among them. No need to bring your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations where we work. ## In Bowburn and still at the petrol pump? In that case, you could not be in a better spot. Turned off it stays; then phone.