St Margarets at Cliffe: Petrol in a Diesel Car? How Worried to Be
Less than you probably are, provided it has not been started. "Have I ruined it?" is the first thing everyone in St Margarets at Cliffe asks, and the truthful answer is usually no, because petrol resting in a diesel tank harms nothing until it's drawn through the fuel system — by ignition priming, by the starter, or by driving. To keep the vehicle like that, ring Petrol in Diesel and leave your motor alone. Further down, you will find what petrol actually does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
Your engine and petrol in a diesel: what goes on
On its way through a motor, diesel does two jobs. It ignites, and before it burns it protects. The high-pressure fuel pump and the fuel injectors are made to extremely fine tolerances, and the diesel passing through them is what stops those surfaces from wearing down against each other.
The second job petrol doesn't do at all, and the first it does badly. A pump working on a petrol blend is wearing itself out, because petrol is thinner than diesel and takes away the lubrication your fuel system relies on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that's where the rattling starts.
Taken together, they make clear the shape the trouble has. Not contact but circulation is what does the harm. A tank with petrol in it is a fuel problem. Once your pump has been labouring on that petrol, a mechanical problem has begun: whatever is shed by a pump that is wearing is carried downstream to your injectors with the fuel.
Petrol in a diesel around St Margarets at Cliffe: how serious is it? Four cases
Filled up, never started. The best case there is. That petrol is in your tank and only that tank, and the task is a drain and a flush where the vehicle stands. This is the one scenario that can only really occur on a forecourt, because anywhere else the car has been driven to get there.
The ignition turned on, or a short start. Once primed, the fuel system has drawn petrol out of the tank up to the filter and the lines. That's normally still a simple job — a drain, a flush, and your filter dealt with.
Your pump now spent a few miles on diluted fuel — that's what driving the car meant. The work is that tank, the lines, the fuel filter and fresh fuel through the whole circuit, and how hard your car was driven matters as much as how far. Driving the kids to St Margaret's-at-Cliffe Primary School is one kind of trip. A run as far as Canterbury, under 25 miles away, is a very different task. So is any miles on the M20, under 10 miles from St Margarets at Cliffe, where your engine has been working hard the whole time.
Driven till it protested. Clattering, an uneven idle, smoke, a throttle that has gone soft. That's the engine telling you its fuel no longer is acting like diesel. Whether it's the verge on Well Lane, a lay-by or a side road, stop there then leave it. A vehicle stopped quickly very seldom has permanent damage, since the fuel drain and the flush, which still come first, take care of it.
Petrol in a diesel myths St Margarets at Cliffe motorists hear
False: topping up to full with diesel makes it fine. It doesn't. Topping up removes nothing; it gives you a fuller tank of the same mix. The assumption behind the advice — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. Smaller components and higher pressure are the way a modern diesel runs its fuel, and that makes the protection count more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that fools people. Feed diesel to a petrol engine and it normally won't run, so the motorist stops — and the harm stops with them. A diesel fed petrol usually starts, idles and drives away as though nothing has happened, while the pump wears. A running engine does not mean fine.
Myth: "Add some two-stroke oil and drive it home." It is an outdated workaround for a separate problem. It doesn't put back what petrol has diluted, and the petrol is still inside the tank later.
Myth: "Drain that tank yourself and you are sorted." Once the engine has run, some of that petrol is no longer inside your tank: it's in the filter and the lines, and it goes straight back through your pump on your next start. It's also truly dangerous to drain petrol into a can by the roadside.
Why petrol in a diesel happens at all
Carelessness is seldom the cause, and nobody means to do it. A diesel nozzle generally won't fit a petrol car, yet the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error simple, and just in that direction.
When routine and your car stop matching, it occurs. A car that is new to you — hired, on loan as a courtesy car, or brand new. Households running one of each, petrol and diesel. A well-known forecourt with the pumps in a different order. Fuelling up in a rush en route to Martin Mill, with a train to catch. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is exactly the moment it takes place. Add a back seat full of children, a phone call or rain, and habit wins.
Preventing petrol in a diesel next time you fill up in St Margarets at Cliffe
- A green handle for unleaded and black for diesel is usual in the UK — but not on every forecourt. Trust the label on the petrol pump, not the colour.
- The first fill in an unfamiliar motor is the time to check your filler flap — inside it, or on the cap, many motors state the fuel they take.
- Good intentions do less than a sticker or a fob in a vivid colour on the diesel's key if a house has one of each. So label it.
- Before the nozzle leaves the pump the first time you fuel a hired or new vehicle, say "diesel" out loud. Daft, perhaps, yet it does the trick.
- Whilst you are thinking about something else, this is an easy mistake to make — so put the phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to block a petrol nozzle, and add-on devices exist for the rest. Treat it as a safety net, then keep checking the petrol pump.
- Less petrol makes a thinner blend, so stop the moment you notice — while remembering that the next step is unchanged. It's still not to start it.
Put petrol in a diesel in St Margarets at Cliffe already?
The order of things is brief, then. Starting it is out, and so is switching on the ignition. The staff on the forecourt — whether at Shell itself or wherever you filled up — will usually help roll it away from the pump if you ask. Next, 0333 366 0103. We will ask what was put in, roughly how much, and if it's been run.
If it was AdBlue instead of petrol, say so. That is a separate issue — corrosion and deposits rather than lost protection — and it has its own page for St Margarets at Cliffe.
St Margarets at Cliffe petrol in a diesel jobs: why one costs more than another
An honest single price does not exist here: four scenarios, four separate tasks. Chiefly, your cost moves with which one you're in. Two things follow that: the petrol that went in as a share of what the tank holds, then the spot the vehicle is in and whether a van can reach it safely.
What got in, how much, and if it's run — three queries our engineers ask before costing, not after, for precisely that reason. Given those answers, there is a straight figure rather than a range.
About St Margarets at Cliffe itself
St Margarets at Cliffe is a village in Kent, situated on the coast near the White Cliffs of Dover, with an elevation of around 84 metres. St Margarets at Cliffe has a mix of housing types, but semi-detached homes are predominant, and the village is close to nearby places like Nelson Park and West Cliffe. St Margarets at Cliffe is located near the port city of Dover and is about 15 miles from Canterbury, making it a part of the wider East Kent landscape. St Margarets at Cliffe remains a small, residential community with a population of around 1593 people.
Across Kent and in St Margarets at Cliffe: fuel drain cover
St Margarets at Cliffe waits in the CT postcode area, and the teams that answer petrol in diesel call-outs there work the locations near it as well — Nelson Park, West Cliffe and Martin Mill among them. Our technicians drain wherever the vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the petrol pump around St Margarets at Cliffe?
The best spot there is, then — that is where you are. Switched off it remains; then ring.