--- title: Silvertown: Petrol in a Diesel Car, Explained canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/silvertown-greater-london/ location: Silvertown county: Greater London latitude: 51.502590 longitude: 0.040090 service: Petrol in a Diesel Car updated: 2026-10-28 --- # Petrol in a Diesel Car in Silvertown: How Worried Should You Be? Probably less than you are now — as long as no one has started the car. Everyone around Silvertown starts with "have I wrecked it?", and the fair answer is usually no: petrol resting inside that tank of any diesel remains harmless until priming, cranking or driving pulls it into the fuel system. Leave your motor off and call Petrol in Diesel — that keeps it that way. What petrol actually does to a diesel, how to judge how far it's gone, and how to keep it from happening a second time: that's the remainder of this page. ## Petrol in a diesel: what does it do to the motor? On its way through an engine, diesel does two jobs. Oiling comes before burning; it does both. Made to very fine gaps, your injectors and the pump depend on your diesel moving through them to stop their surfaces wearing against one another. Badly at the first, not at all at the second: that is petrol. A pump running on a petrol mixture is wearing itself out, since 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 needs from its fuel — and that's where any knocking comes. Combined, those make the shape of the problem plain. Contact doesn't do the harm — circulation does. Any tank with petrol in it is a fuel fault. Whatever a worn pump sheds goes on, borne by your fuel, into your injectors downstream, which is why a pump that has been working on that petrol is where a mechanical fault starts. ## How serious is petrol in a diesel? Four situations our technicians see in Silvertown Filled up, and never started: no case is better. The petrol is in that tank and only the tank, and the job is a drain and a flush where the car stands. This is the one scenario that can only truly occur at a forecourt, since anywhere else the vehicle has been driven to get there. A moment's running, or merely your ignition on. Petrol has left the tank and reached the filter and your lines, since the system has been bled. That is usually still a straightforward task — a drain, a flush, and the fuel filter seen to. A couple of miles driven, and your pump has spent each of them working on weakened fuel. Distance is only half of that; how hard it was driven counts just as much. Either way the work includes that tank, your lines, your filter and fresh fuel through the whole circuit. The school run to Drew Primary School is one thing. Getting as far as London, under 10 miles away, makes a very different job — as does any distance on the M11, under 10 miles from Silvertown, with the engine working hard all the way. Driven till it protested. Clattering, a ragged idle, smoke, a throttle that has gone soft. The motor is telling you your fuel is no longer behaving like diesel. Leave it wherever it has stopped: a lay-by, a quiet street, the verge on North Woolwich Road. Permanent damage is very uncommon if a vehicle is pulled over soon, and the drain and flush that still go first take care of it. ## Petrol in a diesel stories Silvertown people hear Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. A fuller tank of the same mix is all it gives, since topping up takes out nothing. That guidance supposes a diesel fuel system handles petrol by percentage. It does not. If anything, the reverse is true. Myth: "A newer diesel can cope with a bit of petrol." At higher pressure, through more precise parts: that is how a current diesel moves its fuel, so the protection counts more, not less. "It starts, it drives, so no harm done" — the myth that catches most people than any other. Feed diesel to a petrol motor and it usually won't run, and so the motorist stops — and the harm stops with them. Feed petrol to a diesel and it usually fires up, idles and drives away as if nothing happened — all the while its pump is wearing. Running does not mean fine. "A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate issue. It does not put back what petrol has thinned, and the petrol is still in that tank later. If the motor has been run, part of the petrol sits in your filter and the fuel lines, not the tank — and the next start sends it straight back through your pump. So the myth "drain that tank yourself and you're sorted" does not stand up. Clearing petrol into a can by the kerbside is also genuinely risky. ## Petrol in a diesel: how does it take place? It is seldom carelessness, and nobody does it on purpose. One way only, because of the nozzles: the slimmer petrol one slides inside a diesel filler with almost no resistance, while the diesel one generally will not fit a petrol vehicle. That is how the forecourt makes it simple. It occurs when habit and the car stop matching. A new vehicle, a hire car or a courtesy car. Two motors on one drive, one petrol, one diesel. A well-known forecourt with the pumps in a different order. Rushing for a train outside Surrey Quays and fuelling up en route. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver used to petrol: precisely when it takes place. Add rain, a phone call or a back seat full of kids, and the hand repeats what it has always done. ## Next time you fill up around Silvertown: preventing petrol in a diesel - Check the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on each forecourt. The label is what counts. - In a motor you do not know, look inside the flap over the filler or at the cap before your first fill: many vehicles state the fuel type there. - Good intentions count for less than a sticker or a fob in a bright colour on your diesel's key if a household has one of each. So mark it. - 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 petrol pump. It seems silly and it works. - Whilst you are thinking about something else, this is an easy mistake to make — so tuck the phone away. - Up to a point, a misfuel inhibitor helps: some diesels have a filler built to block a petrol nozzle, and add-on devices exist for the remainder. Treat it as a backstop, then keep reading the petrol pump. - Less petrol means a thinner mixture, and so stop the moment you notice — though remembering that your next step is unchanged. It is still not to crank it. ## Put petrol in a diesel in Silvertown already? In that case, there is only a short order of things. Leave it unstarted, with your ignition off as well. Still at the forecourt, at Shell or anywhere else? Ask the attendants to help you roll the vehicle away from the petrol pump. Then call 0333 366 0103 and tell us what was put in, roughly how much, and if it's run. Corrosion and deposits are the issue with AdBlue, where petrol means lost lubrication. So if it was AdBlue, say so — and see its own Silvertown page. ## Why one petrol in a diesel job in Silvertown costs more than another There's no fair single quote for this, since the four scenarios above are four separate jobs. Which of them you are in is mostly what moves the cost. The share matters next, meaning how much of the tank is petrol, and then the position of the vehicle and whether reaching it is safe for our van. Three questions come first, before quoting, instead of after — what was put in, how much, has it run — and this is the reason. A range becomes a straight figure once the replies are in. ## About Silvertown and where it is Silvertown is a suburban area in the London Borough of Newham, situated on the north bank of the Thames River. Silvertown sits at a low elevation of around 1 metre, adjacent to the Custom House and North Woolwich areas. Silvertown is characterized by its predominantly flat-type housing and its proximity to central London, being approximately 7.2 miles from the city centre. Silvertown is also near the nearby places of New Charlton and the River Thames ## Fuel drain cover across Greater London, Silvertown included The vans answering petrol in diesel calls around Silvertown, in the E postcode area, equally work the locations near it, Custom House, North Woolwich and New Charlton included. You need not move the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all locations where we work. ## In Silvertown and still at the pump? No position is better: that is where you are. Ring, and keep it switched off.