Petrol in a Diesel Car in Kilby Bridge: How Worried Should You Be?
Provided it hasn't been started, you can worry less than you probably are. Petrol resting in a diesel tank does nothing to the engine till something pulls it through the system — the ignition priming the pump, the starter, or driving itself. So the honest answer to the first query everyone in Kilby Bridge asks, "have I ruined it?", is normally no. Keep it that way: leave your engine off then phone Petrol in Diesel. Below, you will find what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you a second time.
What petrol in a diesel does to the engine
Passing through a motor, diesel is doing two jobs at once. It protects first, and after that does it burn. What stops the surfaces inside the high-pressure fuel pump and the injectors from wearing against one another is your diesel flowing through them — they're designed to extremely fine clearances.
Petrol handles the first job poorly and the second not at all. The rattling comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection the system hinges on, and any pump running on that mix is wearing itself.
Together, those leave the shape of the trouble plain. Not contact but movement is what does the damage. Where the petrol is only inside your tank, it is a fault of fuel, nothing more. Whatever a worn pump sheds travels on, borne by the fuel, into your injectors downstream, which is why a pump that has been working on the petrol is where a mechanical issue starts.
How serious is petrol in a diesel? Four scenarios we see around Kilby Bridge
Fuelled up, not once started. The best case there can be. Just that tank has petrol in it, so the job is emptying that tank and purging your system where your car stands. This scenario can only truly happen at a forecourt: anywhere else, the car got there by being driven.
Ignition on, or started for a second. With the fuel system primed, your lines and filter now hold petrol that came from your tank. Drain, flush, deal with your filter: still usually straightforward.
Those few miles on the road were your pump running on fuel thinned by petrol the whole way. Distance is only half of it; how hard it was driven matters equally. Either way this work runs to your tank, your lines, the fuel filter and fresh fuel through the whole circuit. Driving the kids to Thythorn Field Community Primary School is one kind of trip. A run as far as Leicester, under 5 miles away, is a very different task. So is any miles on the M1, under 5 miles from Kilby Bridge, where your engine has been running hard the whole time.
Driven till it protested. Knocking, a ragged idle, smoke, a throttle that has gone soft. That is your engine telling you its fuel no longer is acting like diesel. Stop wherever you are — the verge on Cooks Lane, a lay-by, a side street — then leave the car there. The fuel drain and flush-through still come first, and they sort it out: if a vehicle is pulled over early, permanent damage is very unusual.
What Kilby Bridge drivers get told about petrol in a diesel — and the stories in it
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Nothing is removed by topping up — you're left with a fuller tank, still the same mix. A diesel fuel system doesn't accept petrol by percentage in the way that guidance assumes.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. Smaller components and higher pressure are how a modern diesel runs its fuel, and that makes the protection count more, not less.
This is the one that catches people. Myth: "If it starts and drives, there is no harm done." The motorist of a petrol motor fed diesel normally has no choice but to stop, because it will not run, and the harm stops with them. A diesel fed petrol normally starts, ticks over and drives away as if nothing has happened, whilst the pump wears. Fine and running are not the same at all.
An outdated fix for a different issue is behind this one. Myth: "Add some two-stroke oil and drive the car home." What petrol has weakened remains diluted, and that petrol stays inside your tank anyway.
If your engine has been run, part of the petrol sits in the fuel filter and the fuel lines, not that tank — and the next start sends it right back through the pump. So the myth "drain the tank yourself and you are sorted" does not stand up. Draining petrol into a can by the roadside is also truly hazardous.
How petrol ends up: petrol in a diesel
It is seldom carelessness, and nobody does it on purpose. A diesel nozzle mostly will not fit a petrol motor, but the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake easy, and only in that direction.
When routine and the car stop matching, it occurs. A car that is new to you — a hire car, on loan as a courtesy car, or just bought. Two vehicles on one drive, one petrol, one diesel. A forecourt you know, only with its pumps laid out differently. Rushing for a train outside South Wigston and filling up en route. Exactly 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 kids, a phone call or rain, and the hand wins.
Next time you fill up around Kilby Bridge: avoiding petrol in a diesel
- A green handle for unleaded and black for diesel is normal in the UK — but not on every forecourt. Go by the label on the petrol pump, not the colour.
- Plenty of vehicles state the fuel inside the filler flap or on the cap, so check there on the first fill in a vehicle you do not know.
- A coloured fob or a sticker on your diesel's key does more than any amount of intending to remember, for a house with one of each.
- "Diesel", out loud, before you lift the nozzle — each time a new or hired car gets its first tank. It seems daft. It does the trick.
- Put your 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 come with a filler built to reject a petrol nozzle, and add-on devices are available for vehicles without one. They are a safety net, not a reason to stop checking the pump.
- Noticing it mid-fill? Stop at once. A thinner mixture results from less petrol inside that tank, yet the next stage stays the same: don't fire it up.
Already put petrol in a diesel in Kilby Bridge?
In that case, there's just a short order of things. Leave it unstarted, with your ignition switched off as well. Still on the forecourt, at Esso or anywhere else? Ask the staff to help you push it clear of the pump. Next, 0333 366 0103. We'll ask what went in, about how much, and if it's been run.
Say so if it was AdBlue rather than petrol: it's a separate problem, with its own page for Kilby Bridge, because AdBlue brings corrosion and deposits rather than lost protection.
Kilby Bridge petrol in a diesel tasks: why one costs more than another
The four situations above are four separate tasks, so no single price for this would be honest. What moves the cost is chiefly which of them you are in. The proportion counts next, meaning how much of that tank is petrol, followed by the location of your car and whether getting to it is safe for a van.
Before any quote, not after, we ask three questions: the fuel that was put in, its amount, and whether it has run. That is why. Those answers are what change a range into one firm number.
About Kilby Bridge
Kilby Bridge is a locality situated on the banks of the River Soar in Leicestershire, with a mix of semi-detached housing and other residential properties. Kilby Bridge lies close to the city of Leicester, being approximately 4.6 miles away, and is near the villages of Wigston Harcourt, Wigston Magna, and Wigston. Kilby Bridge has a population of around 1087 people and is located at an elevation of 89 metres. Kilby Bridge is part of the wider East Midlands region, about 84.2 miles north of London.
Across Leicestershire and around Kilby Bridge: fuel drain cover
Our vans answering petrol in diesel call-outs in Kilby Bridge, in the LE postcode area, also work the locations around it, Wigston Harcourt, Wigston Magna and Wigston among them. You need not move the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots we drain.
In Kilby Bridge and still at the petrol pump?
Then you're in the best spot there is. Keep it off. Call.