--- title: Explained: Petrol in a Diesel Car Fittleworth canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/fittleworth-west-sussex/ location: Fittleworth county: West Sussex latitude: 50.960420 longitude: -0.562100 service: Petrol in a Diesel Car updated: 2026-10-20 --- # Fittleworth: Petrol in a Diesel Car? How Worried to Be Less than you likely are, if it has not been started. Until your ignition primes the pump, the starter turns, or your vehicle is driven, petrol in a diesel tank just sits there and does no harm. Which makes the truthful reply to the first Fittleworth question — "have I ruined it?" — usually no. To keep the vehicle that way, phone Petrol in Diesel then leave your engine alone. The rest of this page covers what petrol really does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you a second time. ## Inside the motor: what petrol in a diesel does On its way through an engine, diesel has two tasks. It lubricates to begin with, and after that does it burn. The high-pressure pump and your injectors are designed to extremely fine gaps, and the diesel passing through them is what stops those surfaces from grinding against one another. The second job petrol doesn't do at all, and the first it does poorly. A pump running on a petrol mixture is wearing itself out, because petrol is thinner than diesel and takes away the lubrication the fuel system depends on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that is where the rattling starts. Together, those leave the shape of the issue plain. It is circulation that causes the harm, not contact. A tank with petrol in it is a fuel fault. After the pump has been labouring on that petrol, a mechanical issue has begun: whatever is shed by a pump that is wearing is carried onward to the injectors with your fuel. ## Petrol in a diesel around Fittleworth: how serious is it? Four cases Fuelled, and not started: nothing beats it. Being on a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With that petrol held inside your tank alone, it's drained and purged on the spot, and nothing more is needed. Ignition on, or started for a moment. With your system primed, your lines and filter already hold petrol that came from your tank. Normally little more than clearing, flushing and sorting your filter, and so still easy. Driven a few miles. Now the pump has spent these miles running on diluted fuel. Miles is only half of it; how hard it was driven matters equally. Either way the work includes your tank, your lines, the fuel filter and clean fuel through the entire system. The school run to Fittleworth CofE Village School is one thing. A run as far as Chichester, under 15 miles away, is a very different task. So is any distance on the M23, under 25 miles from Fittleworth, where the engine has been working hard the whole time. Driven on until it complained — rattling, smoke, a lumpy idle, a dead throttle. That's your engine telling you its fuel has stopped behaving like diesel. Whether it is the verge on School Lane, a lay-by or a side street, stop where you are then leave it. What comes first is still the drain and flush-through, and that deals with it, with lasting damage very uncommon if a vehicle is pulled over soon. ## What Fittleworth drivers get told about petrol in a diesel — and the myths in it "Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Nothing is removed when you top up — your tank simply carries more of the same blend. That guidance supposes a diesel fuel system handles petrol by percentage. It does not. Not so: a modern diesel copes with a bit of petrol. If anything, the reverse. Protection counts more on current diesels, not less, since their fuel passes through smaller parts at higher pressure. Myth: "If it starts and drives, there's no damage done." This is the one that fools drivers. Diesel in a petrol motor generally 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, as it usually does; meanwhile the pump wears. Being able to run is not proof of being fine. An old fix for a different issue lies behind this one. Myth: "Add some two-stroke oil and drive it home." What petrol has thinned remains diluted, and that petrol stays in the tank anyway. "Drain it yourself and you are sorted" — a myth, because after it's been running some petrol sits in the fuel filter and lines, ready to go right back through your pump on your next start. And, a can of petrol drained by the kerbside is truly risky. ## How does petrol in a diesel take place? On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle mostly will not go into a petrol vehicle, yet the smaller petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error straightforward, and just in one direction. Habit and the car getting out of step is when it occurs. Any motor that's new to you — a hire car, on loan as a courtesy car, or just bought. Two cars on one drive, one petrol, one diesel. Your usual forecourt, its pumps suddenly in a different order. Racing for a train outside Pulborough and filling up en route. A new-to-you diesel Renault Megane, its first fuelling, and a driver accustomed to petrol: exactly when it happens. Add rain, a phone call or a back seat full of children, and the hand does what it has always done. ## Preventing petrol in a diesel next time you fill up in Fittleworth - Not every forecourt in the UK follows green for unleaded and black for diesel, though most usually do. Read the petrol pump's label; the colour is only a clue. - Plenty of motors state the fuel inside the filler flap or on the cap, and so check there on your first fill in a car you don't know. - Good intentions count for less than a sticker or a fob in a vivid colour on your diesel's key if a house has one of each. So label it. - Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump. It sounds silly and it does the trick. - Put the phone away. This is an easy mistake to make while you are thinking about something else. - Some diesels come with a filler designed to reject a petrol nozzle, and devices you can add exist for motors without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump. - Less petrol means a thinner blend, and so stop the moment you realise — though remembering that the next step is unchanged. It is still not to fire it up. ## Already put petrol in a diesel in Fittleworth? Then the order of things is brief. Starting it is out, and so is turning on your ignition. Still on the forecourt, at Elite Garages or anywhere else? Ask the attendants to help you push it clear of the petrol pump. Then call 0333 366 0103 and tell us what got in, roughly how much, and whether it has run. If it was AdBlue rather than petrol, say so. That is a separate fault — corrosion and deposits and not lost protection — and it has its own page for Fittleworth. ## Why one petrol in a diesel job in Fittleworth costs more than another There's no honest single price for this, because the four scenarios above are four separate tasks. Which of them you are in is mostly what moves the cost. Where the car is counts too, and whether our van can safely get to it, after the share of petrol to what that tank takes. Before any quote, not after, we ask three questions: the fuel that got in, the amount, and whether it's run. That is why. Their replies are what turn a range into one firm number. ## About Fittleworth Fittleworth is a small village in West Sussex, situated on the banks of the River Rother at an elevation of around 22 metres. Fittleworth has a mix of old and new housing, with detached homes being the predominant type, and is surrounded by nearby places such as Lower Fittleworth and Churchwood. Fittleworth is located near the city of Chichester, approximately 12.8 miles away, and is about 42.2 miles from London. Fittleworth remains a quiet riverside community with a population of around 738 people. ## Fuel drain cover across West Sussex, Fittleworth included Fittleworth sits in the RH postcode area, and our vans that answer petrol in diesel calls there work the locations near it as well — Lower Fittleworth, Lower Horncroft and Churchwood among them. We drain wherever the car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us. ## At the pump in Fittleworth, still? Then you are in the best position there is. Switched off it remains; then call.