--- title: Explained: Petrol in a Diesel Car Drakelow canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/drakelow-worcestershire/ location: Drakelow county: Worcestershire latitude: 52.423780 longitude: -2.268800 service: Petrol in a Diesel Car updated: 2026-10-01 --- # Drakelow: Petrol in a Diesel Car? How Worried to Be Likely less than you already are — provided nobody has started it. "Have I ruined it?" is the first question anyone around Drakelow asks, and the truthful answer is generally no, because petrol resting in a diesel tank hurts nothing till it is drawn through the fuel system — by ignition priming, by the starter, or by driving. Leave the motor off then call Petrol in Diesel — that is how you keep it that way. What petrol actually does to a diesel, how to gauge how far it's travelled, and how to stop it from happening again: that's the remainder of this page. ## The engine and petrol in a diesel: what happens Two tasks fall to diesel on its route round a motor. Lubricating comes before burning; it does both. Very fine tolerances are built into the fuel injectors and your high-pressure pump, and only your diesel flowing through keeps those surfaces from grinding together. Petrol handles the first job badly and the second not at all. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump running on that mixture to wear itself. It is equally made to resist igniting under compression — the opposite of what a diesel needs — which is where you hear the rattling. Seen together, they make clear the shape the issue takes. Not contact but circulation is what causes the harm. All a tank with petrol in it amounts to is a fuel issue. Whatever a worn pump sheds travels on, borne by the fuel, into the injectors downstream, which is why a pump that has been working on that petrol is where a mechanical fault begins. ## Petrol in a diesel in Drakelow: how serious is it? Four cases The best case there can be: filled up, never started. Just the tank has petrol in it, so the task is draining your tank and flushing the fuel system where the car sits. This situation can only really occur on a forecourt: anywhere else, the car got there by being driven. A moment's running, or just the ignition on. The fuel system has been bled, and so petrol has left that tank and reached the fuel filter and the fuel lines. That's normally still a simple job — a drain, a flush, and your filter dealt with. The pump now spent a few miles on weakened fuel — that is what driving the vehicle meant. Mileage is only half of that; how hard it was driven matters just as much. Either way this work runs to the tank, the lines, the filter and clean fuel through the whole system. Driving the kids to Wolverley Sebright Primary Academy is one kind of trip. Any mileage on the M5, under 10 miles from Drakelow, means the motor has worked hard throughout, and a run to Wolverhampton, under 15 miles away, is a very different job too. Driven until it complained. Knocking, a ragged idle, smoke, a throttle that has gone soft. What you are hearing is your motor reporting fuel that no longer behaves like diesel. Stop on the spot — on the verge on Sladd Lane, at the kerb, down a side road — and do not move it again. What goes first is still the fuel drain and flush, and that deals with it, with lasting damage very uncommon if a car is stopped quickly. ## Petrol in a diesel stories Drakelow people hear It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing is removed by topping up — you are left with a bigger tank, still the same mixture. The assumption behind the advice — that diesel fuel systems tolerate petrol by percentage — is wrong. "Modern diesels can handle a little petrol" — a myth, and nearer the reverse. At higher pressure, through more precise parts: that is how a modern diesel moves its fuel, and so the lubrication counts more, not less. This is the one that fools motorists. Myth: "If it starts and drives, there's no damage done." The driver of a petrol motor fed diesel normally stops, since it will not run, and the damage stops there. While your pump grinds, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Fine and running aren't the same at all. Myth: "Add some two-stroke oil and drive the car home." It's an outdated workaround for a distinct fault. The petrol is still in the tank afterwards, and whatever it has diluted is not put back. If the motor has run, part of that petrol is in the fuel filter and the lines, not your tank — and the next start pulls it straight back through the pump. So the myth "drain that tank yourself and you're sorted" doesn't hold. It's also truly dangerous to drain petrol into a can at the kerbside. ## How does petrol in a diesel happen? It is seldom carelessness, and nobody does it on purpose. The petrol nozzle is the smaller of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol car at all. The forecourt makes it simple, and the slip runs one way. Routine and the vehicle falling out of step is when it takes place. A car that's new to you — a hire car, on loan as a courtesy car, or just bought. Households running one of each, petrol and diesel. A forecourt you know, only with its pumps laid out differently. A train to catch, and a hurried fill en route to Kidderminster. The first fill-up in a diesel Renault Megane after years of driving petrol is exactly the moment it takes place. Throw in rain, a phone call or a back seat full of kids, and the hand repeats what it has always done. ## How to prevent petrol in a diesel on your next fill-up around Drakelow - Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most usually do. Read the pump's label; the colour is just a hint. - In a car you don't know, look inside the flap over your filler or at the cap before the first fill: plenty of cars state the fuel there. - One of each in the household? Label your key to the diesel — a bright fob, a sticker — since meaning to remember is not enough. - Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump. It sounds daft and it does the trick. - While you're thinking about something else, this is an easy mistake to make — so put your phone away. - Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to block a petrol nozzle, and aftermarket devices exist for the remainder. Treat it as a safety net, then keep reading the petrol pump. - Less petrol means a thinner mixture, so stop as soon as you realise — while remembering that the next step is unchanged. It is still not to fire it up. ## Petrol already in a diesel in Drakelow? Begin here Then the order of things is brief. Leave it unstarted, with your ignition off too. Ask the attendants to help you roll it away from the pump if you're still at the forecourt, whether that's Esso or somewhere else. What got in, roughly how much, and if it's run: tell us that when you call 0333 366 0103. Say so if it was AdBlue rather than petrol: it's a separate issue, with its own page for Drakelow, since AdBlue brings corrosion and deposits instead of lost lubrication. ## What makes one Drakelow petrol in a diesel job cost more than the next The four situations above are four separate tasks, so no single quote for this would be honest. What moves the cost is chiefly which of them you're in. The proportion counts next, meaning how much of the tank is petrol, followed by the position of your car and whether getting to it is safe for our van. Three queries come first, before quoting, instead of after — what was put in, how much, has it run — and that is the reason. With the replies, you get a straight figure instead of a range. ## About Drakelow itself Drakelow is a small hamlet in Worcestershire, situated in the West Midlands region of England, with a population of around 508 people. Drakelow lies approximately 12.7 miles from Wolverhampton and 111 miles from London, in a low-lying area at an elevation of 55 metres. Drakelow is characterised by its predominantly detached housing stock and rural setting, near to other small settlements like Blakeshall and Wolverley. Drakelow remains a quiet, residential community with a strong sense of local identity. ## Fuel drain cover around Drakelow and across Worcestershire Drakelow waits in the DY postcode area, and our vans that answer petrol in diesel calls there work the places near it as well — Blakeshall, Wolverley and Kingsford among them. The vehicle does not need to move to us: our technicians drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway. ## In Drakelow and still at the pump? Then, you could not be in a better position. Leave it turned off, and ring.