Winthorpe: Petrol in a Diesel Car? How Worried to Be
Likely less than you are now — provided no one has started the vehicle. "Have I wrecked it?" is the first thing everyone around Winthorpe asks, and the truthful answer is normally no, since petrol resting in a diesel tank harms nothing until it's dragged through the fuel system — by ignition priming, by the starter, or by driving. To keep the car that way, phone Petrol in Diesel and leave the engine switched off. Below, this page sets out what petrol really does inside a diesel, how far it may have gone, and how to stop it happening to you again.
Petrol in a diesel: what does it do to your engine?
Two jobs fall to diesel on its route round a motor. Before it burns, it protects — then it combusts. What stops the surfaces inside the high-pressure fuel pump and the fuel injectors from grinding against one another is the diesel flowing through them — they're built to extremely fine tolerances.
Of those two jobs, petrol handles the first badly and the second not at all. The clattering comes from petrol being made not to ignite when compressed, which is precisely the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection the fuel system depends on, and any pump running on such a mix is wearing itself.
Taken together, they make clear what shape the problem has. Contact does not do the harm — movement does. Petrol in the tank is a fuel fault. Whatever a worn pump sheds goes on, borne by your fuel, into the fuel injectors further along, which is why a pump that has worked on the petrol is where a mechanical fault begins.
How bad is petrol in a diesel? Four scenarios we see around Winthorpe
Fuelled, and never started: no case is better. Being at a forecourt is what makes this the case: elsewhere, your car has been driven there to begin with. With that petrol held inside your tank alone, it's drained and cleaned on the spot, and nothing more is needed.
Started for a second, or only the ignition on. Your system has been primed, so petrol has left that tank and reached your filter and the lines. Still usually easy: drain, flush, and the filter dealt with.
Driven a couple of miles. Now your pump has spent these miles running on diluted fuel. Tank, lines, filter, then fresh fuel run through the whole circuit: that's the work, and the way the car was driven matters as much as the miles. On the school run to Winthorpe Primary School, the miles is small. A run as far as Lincoln, under 15 miles away, is a very different task. So is any mileage on the M1, under 25 miles from Winthorpe, where the motor has been working hard throughout.
Driven on till it protested — knocking, smoke, an uneven idle, a soft throttle. What you are hearing is your engine reporting fuel that no longer runs like diesel. Whether it's the verge on Chapel Lane, a lay-by or a side street, stop where you are then leave it. A car pulled over soon very rarely has long-term damage, as the drain and the flush-through, which still go first, sort it out.
Petrol in a diesel stories Winthorpe people hear
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. Nothing comes out when you top up — your tank just holds more of the same mixture. The assumption behind that advice — that diesel fuel systems accept petrol by percentage — is wrong.
If anything, the reverse is true. Myth: "A newer diesel can cope with a bit of petrol." At higher pressure, through smaller parts: that is how a newer diesel handles its fuel, and so the lubrication matters more, not less.
One myth that catches motorists off guard: if it starts and drives, it must be unharmed. Any petrol motor fed diesel generally will not run, so the driver stops and the harm stops with them. A diesel fed petrol usually starts, idles and drives away as if nothing has happened, while your pump wears. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It's an old fix for a different issue. None of what petrol thinned is put back by it — and later, your tank still holds the petrol.
Myth: "Drain your tank yourself and you are sorted." After your engine has been run, some of the petrol is no longer inside the tank: it's in your filter and the lines, and it goes right back through the pump on the next start. It's also truly dangerous to drain petrol into a can at the kerbside.
How does petrol in a diesel occur?
Carelessness is rarely the cause, and no one means to do it. The petrol nozzle is the smaller of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol vehicle at all. The forecourt makes it simple, and the error runs one way.
Habit and the car getting out of step is how it takes place. Any motor that is new to you — a hire car, on loan as a courtesy car, or just bought. One petrol and one diesel on the drive of the same household. Your ordinary forecourt, its pumps now in a different order. Racing for a train at Newark Northgate and fuelling up en route. Years of petrol vehicles behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that's when. The hand does what it has always done once you add rain, a phone call or a back seat full of children.
Avoiding petrol in a diesel next time you fill up around Winthorpe
- Check the pump, not the colour. In the UK unleaded handles are generally green and diesel black, but not on each forecourt. The label is what matters.
- Check your filler flap. Many cars state the fuel inside the flap or on the cap. Look at it on the first fill in any car you don't know.
- One of each in the home? Mark the key to the diesel — a bright fob, a sticker — since intending to remember is not enough.
- Before the nozzle leaves the petrol pump the first time you fuel a hired or new vehicle, say "diesel" aloud. Silly, yes, but it works.
- Thinking about something else is when this becomes an easy mistake to make, and so put the phone away and keep your mind on the pump.
- Some diesels have a filler built to block a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the pump.
- Less petrol means a thinner blend, and so stop the moment you notice — though remembering that the next stage is unchanged. It's still not to crank it.
Already put petrol in a diesel in Winthorpe?
The order of things is short, then. Don't start it, and don't turn your ignition on. Yet at the forecourt, at Esso or anywhere else? Ask the attendants to help you roll the car away from the petrol pump. Next, 0333 366 0103. We will ask what went in, about how much, and if it has been run.
Corrosion and deposits are the issue with AdBlue, whereas petrol means lost lubrication. So if it was AdBlue, say so — and read its own Winthorpe page.
What makes one Winthorpe petrol in a diesel job cost more than the next
There's no fair single price for this, since the four situations above are four separate jobs. What shifts the cost is chiefly which of them you are in. Two things follow that: the petrol that got in as a share of what that tank holds, then the place the car is in and whether a van can reach it safely.
That's why our technicians ask three queries before pricing instead of after: what was put in, how much, and if it has run. Those answers are what turn a range into one firm number.
About Winthorpe
Winthorpe is a small village in Nottinghamshire, situated on the banks of the River Trent at an elevation of around 20 metres. Winthorpe lies near the villages of Langford, South Muskham, and North Muskham, and is approximately 13.8 miles from the city of Lincoln. Winthorpe has a population of around 594 people, predominantly living in detached houses. Winthorpe is located in the East Midlands region, about 113.6 miles north of London.
Fuel drain cover across Nottinghamshire, Winthorpe included
Our teams answering petrol in diesel call-outs in Winthorpe, in the NG postcode area, also work the spots near it, Langford, South Muskham and North Muskham among them. Our engineers drain wherever your car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
At the pump in Winthorpe, right now?
No position is better: that's where you now are. Leave the car switched off, and ring.