--- title: Worried? Petrol in a Diesel Car Worthing canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/worthing-west-sussex/ location: Worthing county: West Sussex latitude: 50.814260 longitude: -0.371220 service: Petrol in a Diesel Car updated: 2026-10-12 --- # Should You Worry? Petrol in a Diesel Car in Worthing Likely less than you are now — provided no one has started it. "Have I wrecked it?" is the first question anyone around Worthing asks, and the truthful answer is normally no, because petrol resting in a diesel tank harms nothing until it is dragged through your fuel system — by ignition priming, by your starter, or by driving. To leave it that way, phone Petrol in Diesel then leave the engine switched off. What petrol actually does to a diesel, how to gauge how far it has travelled, and how to keep it from happening a second time: that is the remainder of this page. ## What petrol in a diesel does to the engine Passing through an engine, diesel is doing two jobs at once. Before it combusts, it protects — then it burns. Built to extremely fine clearances, your injectors and your pump depend on the diesel flowing through them to stop their surfaces wearing against one another. Petrol handles the first task badly and the second not at all. It is thinner than diesel and strips away the protection your fuel system hinges on, so a pump running on a petrol blend is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That's where the clattering comes from. Combined, those make the shape of the problem clear. The damage is done by circulation, not by contact. All a tank with petrol in it amounts to is a fuel problem. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the fuel injectors further on. ## How bad is petrol in a diesel? Four scenarios our engineers see in Worthing The best case there can be: filled up, not once started. That petrol is in the tank and just the tank, and the task is a drain and a flush where the car stands. This is the one situation that can only truly occur on a forecourt, because anywhere else your car has been driven to get there. The ignition switched on, or a brief start. The fuel system has been bled, so petrol has left the tank and got to your filter and the lines. That's normally still an easy task — a drain, a flush, and the filter dealt with. Those few miles on the road meant your pump running on fuel thinned by petrol throughout. The work is that tank, your lines, the fuel filter and fresh fuel through the entire system, and how hard the vehicle was driven matters as much as how far. On the school run to St Mary's Catholic Primary School, the mileage is small. Very different again: a run to Brighton and Hove, under 15 miles away, or some distance on the M23, under 25 miles from Worthing, where the motor never stopped running hard. It protested, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone ragged. The fuel is not behaving like diesel any more, and the engine is saying so. Pull up wherever you are — the verge on Chapel Road, a lay-by, a side street — and leave it there. Permanent damage is very uncommon if a vehicle is stopped quickly, and the fuel drain and flush that still come first sort it out. ## Petrol in a diesel stories Worthing drivers hear "Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. A bigger tank of the same mix is all you get, because topping up removes nothing. A diesel fuel system doesn't accept petrol by percentage in the way that advice assumes. "Current diesels can handle a little petrol" — a myth, and closer to the reverse. At higher pressure, through finer components: that is how a newer diesel moves its fuel, so the lubrication counts for more, not less. "It starts, it drives, and so no harm done" — the myth that catches more people than any other. A petrol motor fed diesel generally won't run, so the motorist stops and the damage stops with them. Whilst the pump grinds, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Running does not mean fine. Myth: "Add some two-stroke oil and drive the vehicle home." It is an old fix for a separate issue. What petrol has weakened stays weakened, and the petrol stays inside that tank anyway. "Drain it yourself and you're sorted" — a myth, since after it's been running some petrol sits in your filter and lines, waiting to go right back through your pump on your next start. It is also truly dangerous to drain petrol into a can by the roadside. ## Petrol in a diesel: how does it happen? No one does it on purpose, and it's rarely carelessness. A diesel nozzle mostly will not go into a petrol motor, but the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake straightforward, and only in that direction. When routine and the car stop matching, it happens. Any vehicle that is new to you — hired, on loan as a courtesy car, or brand new. Two motors on one drive, one petrol, one diesel. A well-known forecourt with the pumps in a different order. A train to catch, and a rushed fill en route to the nearest station. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is exactly the moment it occurs. Add rain, a phone call or a back seat full of kids, and the hand does what it has always done. ## Next time you fill up in Worthing: avoiding petrol in a diesel - Check the pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on every forecourt. The label is what counts. - Many motors state the fuel inside your filler flap or on the cap, and so check there on your first fill in a motor you don't know. - A coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember, for a home with one of each. - "Diesel", out loud, before you pick up the nozzle — each time a new or hired car gets its first tank. It sounds daft. It works. - While you are thinking about something else, this is an easy mistake to make — so tuck the phone away. - A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to reject a petrol nozzle, and add-on devices are available for cars without one. They are a backstop, not a reason to stop checking the pump. - Stop as soon as you realise. Less petrol in your tank means a weaker mix. It doesn't change what to do next, which is still not to start it. ## Petrol already in a diesel around Worthing? Start here Short and simple, then, is the order of things. Do not start the vehicle, and don't switch your ignition on. Yet at the forecourt, at Esso or anywhere else? Ask the staff to help you push the vehicle away from the pump. Next, 0333 366 0103. We'll ask what was put in, roughly how much, and if it's been run. Say so if it was AdBlue instead of petrol: it is a separate problem, with its own page for Worthing, because AdBlue brings corrosion and deposits instead of lost protection. ## One petrol in a diesel job in Worthing costs more than another. Why? Four separate tasks lie behind the four situations above — which is why there is no fair single price. Mostly, the cost moves with which one you are in. Where the car is matters too, and whether a technician can safely reach it, after the ratio of petrol to what that tank holds. That is why our engineers ask three questions before quoting instead of after: what went in, how much, and whether it's run. With the answers, you get a straight figure instead of a range. ## About Worthing Worthing is a coastal town in West Sussex, situated on the south coast of England, approximately 49 miles from London. Worthing has a relatively low elevation of around 11 metres above sea level and is bordered by nearby places such as East Worthing, West Worthing, and Broadwater. Worthing is predominantly composed of flat housing, reflecting its urban character. Worthing is close to the city of Brighton and Hove, which is about 10 miles away. ## Fuel drain cover in Worthing and across West Sussex Petrol in diesel jobs in Worthing — part of the BN postcode area — go to vans that also cover the places round it, East Worthing, West Worthing and Broadwater included. Our technicians drain where the vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us. ## At the petrol pump around Worthing, still? Then you're in the best position there can be. Leave it switched off, and ring.