Kirkheaton: Petrol in a Diesel Car? How Worried to Be
Less than you probably are, provided it has not been started. Until the ignition primes your pump, your starter cranks, or your car is driven, petrol in a diesel tank just sits there and does nothing. Which makes the truthful reply to the first Kirkheaton query — "have I wrecked it?" — usually no. To leave the vehicle like that, call Petrol in Diesel then leave your engine alone. The remainder of this page sets out what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you a second time.
Your engine and petrol in a diesel: what happens
Diesel does two jobs on its way through a motor. It ignites, and before it ignites it lubricates. Extremely fine tolerances go into your injectors and your high-pressure pump, and only your diesel running through stops their surfaces grinding together.
The second task petrol does not do at all, and the first it does badly. 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 thinner than diesel, it strips away the lubrication the fuel system hinges on, and any pump running on that mix is wearing itself.
The shape of the problem is plain when you put those together. The harm is done by movement, not by contact. Petrol in a tank is a fuel problem. The beginning of a mechanical one is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with the fuel to your injectors downstream.
Petrol in a diesel around Kirkheaton: how bad is it? Four situations
Fuelled up, not once started. The best case there can be. Being at a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With that petrol held in your tank alone, it's cleared and cleaned right where it stands, and nothing more is needed.
Started for a second, or only your ignition on. With your system primed, the fuel lines and filter now hold petrol that came from that tank. That's normally still a simple task — a drain, a flush, and the fuel filter dealt with.
A few miles driven, and the pump has spent every one of them running on thinned fuel. Distance is only half of it; how hard it was driven matters just as much. Either way the work includes the tank, the lines, the filter and fresh fuel through the whole system. Driving the kids to Kirkheaton Primary School is one sort of trip. A run as far as Bradford, under 10 miles away, is a very different task. So is any distance on the M62, under 3 miles from Kirkheaton, where your engine has been running hard the whole time.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone uneven. That's the engine telling you its fuel no longer is behaving like diesel. Pull up wherever you are — the verge on Bankfield Lane, a lay-by, a side street — then leave the car there. The fuel drain and flush still come first, and they take care of it: when a car is stopped quickly, long-term damage is very rare.
Myths Kirkheaton drivers hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Topping up takes out nothing; it gives you a bigger tank of the same mix. Percentage is not how a diesel fuel system tolerates petrol, whatever that advice assumes.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through smaller parts: that is how a modern diesel moves its fuel, so the lubrication counts more, not less.
"It starts, it drives, so no harm done" — the myth that catches more motorists than any other. Any petrol engine fed diesel generally will not run, so the motorist stops and the harm stops with them. A diesel fed petrol generally starts, idles and drives away as though nothing has happened, whilst your pump wears. Being able to run is not the same as being fine.
Not so: a two-stroke additive makes it safe to drive home. It was an old fix, meant for another fault. That petrol is still in your tank afterwards, and whatever it has weakened isn't put back.
Myth: "Drain that tank yourself and you're sorted." After your engine has been run, some of that petrol is no longer inside that tank: it is in the fuel filter and your lines, and it goes straight back through the pump on your next start. Besides, petrol drained into a can by the road is genuinely dangerous.
Why petrol in a diesel happens so easily
On purpose? Never. Through carelessness? Rarely, if ever. One way only, because of the nozzles: the slimmer petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol vehicle. That's how the forecourt makes it straightforward.
The moment habit stops matching your car is the moment it occurs. A vehicle that is new to you — hired, on loan as a courtesy car, or just bought. Two cars on one drive, one petrol, one diesel. A forecourt you know, but with its pumps arranged differently. Racing for a train outside Deighton and filling up en route. Exactly the moment it happens: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. Your hand does what it has always done when you add rain, a phone call or a back seat full of kids.
Avoiding petrol in a diesel next time you fill up in Kirkheaton
- Green for unleaded and black for diesel is normal in the UK — yet not on every forecourt. Go by the label on the petrol pump, not the colour.
- Inspect your filler flap. Plenty of vehicles state the fuel type inside the flap or on the cap. Look at it on the first fill in any vehicle you don't know.
- A coloured fob or a sticker on the diesel's key does more than any amount of intending to remember, for a house with one of each.
- It sounds daft and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- While 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 built to reject a petrol nozzle, and aftermarket devices are available for the remainder. Treat it as a backstop, then keep reading the pump.
- Spotting it halfway? Stop at once. A thinner blend results from less petrol in that tank, but your next step stays the same: do not start the car.
Put petrol in a diesel around Kirkheaton already?
The order of things is short, then. Don't turn your ignition on, and don't fire it up. Ask the staff to help you push it away from the petrol pump if you're still at the forecourt, whether that is Morrisons or anywhere else. Then phone 0333 366 0103 and tell us what got in, roughly how much, and if it has run.
Corrosion and deposits are the issue with AdBlue, where petrol means lost protection. So if it was AdBlue, say so — and read its own Kirkheaton page.
What makes one Kirkheaton petrol in a diesel task cost more than the next
There is no honest single quote for this, since the four scenarios above are four different jobs. The situation itself does most of the work of moving the cost. The ratio matters next, meaning how much of your tank is petrol, followed by the location of the vehicle and whether getting to it is safe for a technician.
What went in, how much, and if it has run — three queries our engineers ask before pricing, not after, for exactly that reason. The replies change a range into a straight figure.
About Kirkheaton itself
Kirkheaton is a village in West Yorkshire, situated near the River Calder and characterised by semi-detached housing. Kirkheaton sits at an elevation of around 120 metres, with nearby landmarks including Nab Hill and Cockley Hill. Kirkheaton is located approximately 9 miles from Bradford and is part of the wider Yorkshire and the Humber region. Kirkheaton has a population of around 2694 residents.
Across West Yorkshire and in Kirkheaton: fuel drain cover
Nab Hill, Cockley Hill and Upper Heaton are among the places near Kirkheaton that the same vans work, answering petrol in diesel call-outs across Kirkheaton's HD postcode area. A forecourt, a supermarket car park, a lay-by or your own drive are all places our engineers drain, and the car does not need to move to us.
Kirkheaton: still at the petrol pump?
Then you are in the best place there is. Keep it off. Call.