Petrol in a Diesel Car in Keyworth: How Worried Should You Be?
Not started? Then less worried than you likely feel. Until the ignition primes the pump, the starter cranks, or your vehicle is driven, petrol in a diesel tank simply waits there and does no harm. Which makes the truthful reply to that first Keyworth query — "have I ruined it?" — usually no. Leave your engine off and ring Petrol in Diesel — that is how you keep it like that. Further down, this page sets out what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you again.
Inside the motor: what petrol in a diesel really does
Diesel does two jobs on its way through a motor. Oiling comes before burning; it does both. Extremely fine clearances are built into your injectors and your high-pressure pump, and just the diesel flowing through keeps their surfaces from grinding together.
Petrol does the first job badly and the second not at all. The knocking comes from petrol being designed 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 away the lubrication the system rests on, and any pump running on that mixture is wearing itself.
Put these together and the shape of the issue is clear. It's circulation that does the harm, not contact. A tank with petrol in it is a fuel issue. Whatever a worn pump sheds travels on, borne by the fuel, into the injectors downstream, which is why a pump that has been working on that petrol is where a mechanical fault starts.
Petrol in a diesel in Keyworth: how serious is it? Four cases
Fuelled up, not once started. The best case there can be. At a forecourt, and really only there, the petrol is still confined to that tank — because anywhere else the vehicle was driven to reach it. The job is emptying and purging on the spot.
The ignition turned on, or a brief start. The system has been bled, so petrol has left your tank and got to the filter and the lines. Drain, flush, see to your filter: still normally easy.
Driven a couple of miles. Now your pump has spent these miles working on thinned fuel. How hard your car was driven matters as much as how far, and this work takes in the tank, the lines, the fuel filter and clean fuel through the entire circuit. Short trips, such as the school run to Keyworth Primary and Nursery School, are one thing. A run as far as Nottingham, under 10 miles away, is a very different job. So is any mileage on the M1, under 10 miles from Keyworth, where the motor has been running hard throughout.
Driven till it protested. Rattling, a ragged idle, smoke, a throttle that has gone soft. What you are hearing is your motor signalling fuel that no longer acts like diesel. Pull up where you are — on the verge on Selby Lane, at the kerb, down a side road — and do not move it again. A vehicle pulled over quickly very seldom has long-term damage, as the drain and the flush-through, which still come first, take care of it.
Myths Keyworth people hear about petrol in a diesel
Myth: topping up to full with diesel makes it fine. It does not. Nothing is removed when you top up — the tank simply carries more of the same blend. Percentage isn't how a diesel fuel system copes with petrol, however much that guidance presumes.
If anything, the reverse holds. Myth: "A current diesel can cope with a bit of petrol." At higher pressure, through smaller components: that's how a newer diesel moves its fuel, so the lubrication matters for more, not less.
"It starts, it drives, so there is no harm" — the myth that trips up most motorists than any other. Feed diesel to a petrol engine and it normally won't run, and so the driver stops — and the harm stops with them. A diesel fed petrol generally starts, idles and drives away as though nothing has happened, while your pump grinds. Running isn't the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct issue. None of what petrol weakened is put back by it — and afterwards, your tank still holds that petrol.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol lies in your filter and lines, ready to go straight back through your pump on the next start. On top of that, petrol drained into a can by the road is truly dangerous.
Petrol in a diesel: how does it happen?
Carelessness is rarely the cause, and nobody means to do it. A diesel nozzle generally won't go into a petrol motor, yet the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake simple, and just in one direction.
Habit and your car falling out of step is when it takes place. A vehicle that is new to you — a hire car, on loan as a courtesy car, or brand new. A household with one petrol and one diesel on the driveway. Your normal forecourt, its pumps suddenly in a different order. A train to catch, and a rushed fill en route to Nottingham. Precisely the moment it happens: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Throw in a back seat full of children, a phone call or rain, and habit takes over.
Keyworth drivers: how to prevent petrol in a diesel next time
- Read the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on each forecourt. The label is what counts.
- The first fill in an unfamiliar motor is the time to check the filler flap — inside it, or on the cap, many motors state which fuel they take.
- Label the key. In a household with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- 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 sounds daft and it works.
- Tuck the phone away. This is an easy mistake to make whilst you're thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to refuse a petrol nozzle, and add-on devices are available for cars without one. They are a backstop, not a reason to stop reading the pump.
- Noticing it mid-fill? Stop at once. A thinner mix follows from less petrol in that tank, yet your next step stays the same: don't fire it up.
Petrol already in a diesel around Keyworth? Begin here
The order of things is brief, then. Starting it is out, and so is switching on the ignition. Still at the forecourt, at Byford Power or anywhere else? Ask the attendants to help you push the car away from the pump. Next, 0333 366 0103. We will ask what was put in, about how much, and if it has been run.
If it was AdBlue instead of petrol, say so. That's a different issue — corrosion and deposits and not lost protection — and it has its own page for Keyworth.
What makes one Keyworth petrol in a diesel task cost more than the next
There is no fair single price for this, since the four scenarios above are four separate jobs. What shifts your cost is mostly which of them you are in. The share counts next, meaning how much of that tank is petrol, followed by the location of your car and whether reaching it is safe for a technician.
Three queries come first, before any quote, rather than after — what went in, how much, has it run — and that is the reason. The replies change a range into a straight figure.
About Keyworth, briefly
Keyworth is a village in Nottinghamshire, situated approximately 6 miles south of Nottingham, and is characterized by its predominantly detached housing stock. Keyworth sits in a relatively low-lying area, with an elevation of around 86 metres, and is surrounded by nearby places such as Plumtree Park and Stanton-on-the-Wolds. Keyworth has a population of around 1583 residents, and is located within the East Midlands region, about 102 miles north of London.
Fuel drain cover around Keyworth and across Nottinghamshire
Plumtree Park, Stanton-on-the-Wolds and Plumtree are among the locations near Keyworth that the same vans work, answering petrol in diesel calls across Keyworth's NG postcode area. A forecourt, a supermarket car park, a lay-by or your own drive are all locations our engineers work, and your car does not need to move to us.
Keyworth: still at the pump?
In that case, you couldn't be in a better place. Leave it switched off, and ring.