Petrol in a Diesel Car in Langport: How Worried Should You Be?
Not started? Then less anxious than you probably are. Everyone in Langport begins with "have I ruined it?", and the honest answer is normally no: petrol left in the tank of any diesel remains harmless till priming, cranking or driving pulls it into the system. To keep the car that way, call Petrol in Diesel and leave the motor switched off. Below, this page sets out what petrol actually does inside a diesel, how far it may have got, and how to stop it happening to you again.
Petrol in a diesel: what does it do to the engine?
Two jobs fall to diesel on its route through a motor. It burns, and before it burns it protects. Built to extremely fine clearances, the injectors and the pump rely on the diesel moving through them to keep their surfaces from wearing against one another.
Of those two jobs, petrol handles the first badly and the second not at all. It's thinner than diesel and takes away the lubrication the system rests 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 is where the clattering comes from.
Combined, those make the shape of the trouble clear. It's circulation that does the damage, not contact. Where that petrol is only in that tank, it's an issue of fuel, nothing more. A pump that has been working on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the injectors downstream.
How bad is petrol in a diesel? Four situations our engineers see around Langport
Fuelled but never started — as good as it gets. Only the tank has petrol in it, so the task is clearing that tank and cleaning the system where the car stands. This situation can only really occur on a forecourt: anywhere else, the car got there by being driven.
Started for a second, or just the ignition on. Once primed, the fuel system has pulled petrol out of the tank as far as the fuel filter and the fuel lines. Drain, flush, deal with your filter: still normally easy.
A few miles driven, and your pump has spent each of them working on diluted fuel. How hard the vehicle was driven counts as much as how far, and this work covers that tank, the lines, your filter and clean fuel through the entire circuit. On the school run to Huish Episcopi Primary School, the miles is small. Any distance on the M5, under 10 miles from Langport, means your engine working hard throughout, and a run to Wells, under 15 miles away, makes a very different task as well.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. That's your engine telling you its fuel no longer is acting like diesel. Whether it's the verge on Cheapside, a lay-by or a side road, stop there and leave it. A car stopped quickly very seldom has permanent damage, as the drain and the flush-through, which still go first, take care of it.
What Langport motorists get told about petrol in a diesel — and the stories in it
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Topping up removes nothing; it gives you a fuller tank of the same mixture. Percentage is not how a diesel fuel system tolerates petrol, whatever that guidance supposes.
If anything, the reverse is true. Myth: "A newer diesel can cope with a bit of petrol." Lubrication counts more on current diesels, not less, since their fuel passes through finer parts at higher pressure.
One myth that catches motorists out: if it starts and drives, it must be unharmed. Feed diesel to a petrol engine and it normally won't run, and so the motorist stops — and the harm stops with them. Whilst the pump grinds, a diesel fed petrol usually starts, idles and drives away as though nothing has happened. Being able to run isn't the same as being fine.
Myth: a two-stroke additive makes it safe to drive home. It was an old workaround, meant for another problem. That petrol is still in that tank after that, and what it has thinned isn't put back.
The next start sends petrol back round your pump from the lines and your filter, where some of it ends up after your engine has been run. That is why draining your tank yourself doesn't leave you sorted — a myth. On top of that, petrol emptied into a can by the road is truly risky.
How does petrol in a diesel take place?
It's rarely carelessness, and no one does it on purpose. The forecourt makes it simple: the petrol nozzle is the smaller of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle mostly won't go into a petrol car at all. So the error runs one way.
It happens when habit and your car stop matching. A new car, a hire car or a courtesy car. A household with one petrol and one diesel on the driveway. The pumps in a different order on a familiar forecourt. A train to catch, and a hurried fill on the way to Bridgwater. Precisely the moment it takes place: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Throw in rain, a phone call or a back seat full of children, and your hand does what it has always done.
Langport drivers: how to avoid petrol in a diesel next time
- Read the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, yet not on every forecourt. The label is what counts.
- In a car you do not know, look inside the flap over your filler or at the cap before the first fill: many cars print the fuel type there.
- Mark the key. In a household with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- Before the nozzle comes off the petrol pump the first time you fuel a hired or new car, say "diesel" out loud. Silly, perhaps, but it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck your phone away and keep your mind on the petrol pump.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to reject a petrol nozzle, and add-on devices are available for motors without one. They are a backstop, not a reason to stop reading the pump.
- Stop the moment you realise. Less petrol inside your tank makes a thinner mix. It does not change what to do next, which is still not to crank it.
Already put petrol in a diesel around Langport?
Short and simple, then, is the order of things. Do not switch the ignition on, and do not crank it. Still at the forecourt, at Esso or anywhere else? Ask the staff to help you push it away from the petrol pump. Next, 0333 366 0103. We'll ask what was put in, roughly how much, and if it's been run.
Corrosion and deposits form the issue with AdBlue, where petrol means lost lubrication. So if it was AdBlue, say so — and see its own Langport page.
Langport petrol in a diesel tasks: why one costs more than another
A fair single price doesn't exist here: four situations, four separate jobs. Which of them you're in is mostly what shifts your cost. Two things come after that: the petrol that got in as a proportion of what that tank takes, then the place the car is in and whether our van can reach it safely.
Three questions come first, before quoting, rather than after — what got in, how much, has it run — and that is the reason. The answers change a range into a straight figure.
About Langport, briefly
Langport is a small town in Somerset, situated on the River Parrett in the South West of England. Langport sits at a low elevation of around 16 metres, with its riverside location influencing its development and character. Langport has a mix of housing types, but semi-detached homes are particularly prevalent, and its population of approximately 3614 people supports a range of local amenities. Langport is located near several smaller settlements, including Langport Eastover and Huish Episcopi.
Fuel drain cover in Langport and across Somerset
Langport Eastover, Whatley and Huish Episcopi are among the spots around Langport that the same vans work, answering petrol in diesel call-outs across Langport's TA postcode area. We 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.
Langport: still at the pump?
The best place there is, then — that's where you are. Call, and leave it turned off.