How Worried Should You Be? Petrol in a Diesel Car in West Melton
Provided it hasn't been started, you can worry less than you probably are. Petrol resting in a diesel tank does nothing to your motor till something draws it through the system — the ignition priming the pump, your starter, or the drive itself. So the honest answer to the first query anyone in West Melton asks, "have I ruined it?", is usually no. To keep the car that way, phone Petrol in Diesel and leave your engine alone. The rest of this page explains what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you a second time.
Inside the engine: what petrol in a diesel does
Diesel does two tasks on its way through a motor. Before it burns, it protects — then it burns. Extremely fine gaps are built into your injectors and the high-pressure fuel pump, and only your diesel flowing through stops those surfaces grinding together.
Badly at the first, not at all at the second: that's petrol. The rattling comes from petrol being designed not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection your system hinges on, and any pump working on that mixture is wearing itself.
The shape of the trouble is plain when you put those together. It's movement that causes the damage, not contact. All a tank with petrol in it amounts to is a fuel problem. Whatever a worn pump sheds travels on, borne by your fuel, into your injectors further along, which is why a pump that has been working on the petrol is where a mechanical fault begins.
How serious is petrol in a diesel? Four scenarios we see in West Melton
Fuelled but not once started — as good as it gets. The petrol is inside that tank and only your tank, and the task is a drain and a flush where your car sits. This is the one situation that can only really happen on a forecourt, because anywhere else the car has been driven to get there.
Ignition on, or started for a second. With the system primed, the lines and filter now contain petrol that has come from that tank. That is usually still a straightforward task — a drain, a flush, and the fuel filter dealt with.
A couple of miles driven, and your pump has spent every one of them labouring on thinned fuel. The work is the tank, your lines, the filter and fresh fuel through the whole system, and how hard the vehicle was driven matters as much as how far. A school run to Highfield Farm Primary School is one matter. A run as far as Sheffield, under 10 miles away, is a very different task. So is any distance on the M1, under 5 miles from West Melton, where your engine has been labouring hard throughout.
Knocking, an uneven idle, smoke, a throttle gone soft: driven till it complained. The engine is telling you the fuel is no longer acting like diesel. Leave it where it has stopped: a lay-by, a quiet street, the verge on Low Farm Mews. Long-term damage is very uncommon when a car is pulled over quickly, and the drain and flush-through that still come first take care of it.
What West Melton drivers get told about petrol in a diesel — and the myths in it
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. A fuller tank of the same mixture is all you get, since topping up takes out nothing. Percentage is not how a diesel fuel system copes with petrol, whatever that advice presumes.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through smaller parts: that's how a modern diesel handles its fuel, so the protection matters more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that fools drivers. Diesel in a petrol motor usually means a motor that won't run: the driver stops, and so does the harm. Feed petrol to a diesel and it usually fires up, ticks over and drives away as if nothing has happened — all while its pump is wearing. Being able to run is not the same as being fine.
Myth: "Add some two-stroke oil and drive the car home." It is an old fix for a distinct problem. The petrol is still inside that tank afterwards, and whatever it has diluted isn't put back.
The next start draws petrol back round the pump out of the lines and your filter, where some of that ends up after the motor has run. That's why draining your tank yourself does not leave you sorted — a myth. It's also genuinely risky to drain petrol into a can by the roadside.
How it happens: petrol in a diesel
Nobody does it on purpose, and it's seldom carelessness. A diesel nozzle mostly won't fit a petrol vehicle, but the smaller petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake easy, and just in that direction.
It happens when routine and your car stop matching. Hire cars, courtesy cars, and motors that are new to you. Households running one of each, petrol and diesel. A well-known forecourt with the pumps in a different order. A train to catch, and a rushed fill on the way to Bolton-On-Dearne. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist used to petrol: exactly when it happens. Add a back seat full of kids, a phone call or rain, and habit takes over.
Next time you fill up in West Melton: avoiding petrol in a diesel
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Read the pump's label; the colour is only a clue.
- Many cars state the fuel inside the filler flap or on the cap, so check there on your first fill in a car you do not know.
- One of each in the home? Mark your key to your diesel — a coloured fob, a sticker — because intending to remember isn't enough.
- "Diesel", aloud, before you pick up the nozzle — every time a new or hired car needs its first tank. It sounds daft. It does the trick.
- Tuck your phone away. This is an easy mistake to make whilst you are thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels come with 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.
- Noticing it halfway? Stop at once. A weaker blend results from less petrol in that tank, but the next stage remains the same: don't start it.
West Melton: already put petrol in a diesel?
Short and simple, then, is the order of things. Leave it unstarted, with your ignition switched off as well. If you are still on the forecourt — JET or anywhere else — ask the attendants to help you roll the car clear of the petrol pump. Next, 0333 366 0103. We will ask what got in, about how much, and if it has been run.
If it was AdBlue rather than petrol, say so. That is a different fault — corrosion and deposits rather than lost protection — and it has its own page for West Melton.
What makes one West Melton petrol in a diesel job cost more than the next
The four situations above are four separate tasks, so no single quote for this would be fair. Chiefly, the cost moves with which one you're in. The proportion counts next, meaning how much of that tank is petrol, and then the position of the car and whether reaching it is safe for a technician.
What got in, how much, and whether it's run — three queries our engineers ask before quoting, not after, for exactly that reason. A range becomes a straight figure when the answers are in.
About West Melton, for a moment
West Melton is a suburban area in South Yorkshire, situated near the River Dearne at an elevation of 49 metres. West Melton lies approximately 9 miles from Sheffield and is part of the larger urban area surrounding the city. West Melton has a mix of housing types, with semi-detached homes being the most prevalent. West Melton is close to nearby places such as Newhill and Wath upon Dearne, and is about 147 miles north of London.
Fuel drain cover in West Melton and across South Yorkshire
The teams answering petrol in diesel call-outs in West Melton, in the S postcode area, also work the spots near it, Newhill, Wath upon Dearne and Westfield included. You need not move the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places where we work.
At the petrol pump around West Melton, still?
Nothing beats it: that is where you now are. Keep it off. Ring.