Easthorpe: Petrol in a Diesel Car? How Worried to Be
Far less than you likely are, if it hasn't been started. Petrol resting in a diesel tank does nothing to the engine until something pulls it through your fuel system — your ignition priming the pump, the starter, or the drive itself. So the fair answer to the first question anyone around Easthorpe asks, "have I ruined it?", is generally no. Leave the motor off and phone Petrol in Diesel — that is how you keep it that way. The rest of this page covers what petrol really does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you again.
Inside the motor: what petrol in a diesel really does
Diesel has two tasks on its way through an engine. Before it ignites, it lubricates — then it burns. The high-pressure pump and the fuel injectors are made to very fine clearances, and your diesel passing through them is what keeps those surfaces from wearing down against each other.
Poorly at the first, not at all at the second: that's petrol. It is thinner than diesel and removes the protection the system hinges on, and so a pump running on a petrol blend is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That's where the knocking comes from.
Put these together and the shape of the trouble is plain. Contact doesn't do the harm — movement does. A tank with petrol in it is a fuel problem. Whatever a worn pump sheds travels on, borne by your fuel, into your injectors downstream, which is why a pump that has worked on the petrol is where a mechanical issue starts.
Petrol in a diesel around Easthorpe: how serious is it? Four situations
The best case there is: filled up, not once started. Being at a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With the petrol kept inside that tank alone, it's emptied and flushed on the spot, and nothing more is needed.
The ignition turned on, or a brief start. The system has been primed, so petrol has left that tank and got to the fuel filter and your lines. That is normally still a simple task — a drain, a flush, and the fuel filter seen to.
Driven a couple of miles. Now your pump has spent these miles labouring on diluted fuel. How hard the car was driven counts as much as how far, and the work takes in your tank, the lines, the fuel filter and fresh fuel through the entire circuit. On the school run to Bottesford Church of England Primary School, the mileage is small. Any mileage on the M1, under 25 miles from Easthorpe, means your engine has worked hard throughout, and a run to Nottingham, under 15 miles away, is a very different job as well.
Driven on till it complained — clattering, smoke, an uneven idle, a dead throttle. That's the motor telling you its fuel has stopped behaving like diesel. Stop wherever you are — the verge on Green Lane, a lay-by, a side street — then leave it there. The fuel drain and flush still come first, and they take care of it: if a vehicle is pulled over soon, lasting damage is very uncommon.
Easthorpe people and that petrol in a diesel myths they hear
Myth: topping up to full with diesel makes it fine. It does not. A fuller tank of the same mix is all it gives, because topping up removes nothing. A diesel fuel system does not accept petrol by percentage in the way that guidance supposes.
Myth: a current diesel copes with a bit of petrol. If anything, the opposite. At higher pressure, through smaller components: that's how a modern diesel moves its fuel, so the lubrication matters for more, not less.
The myth that catches people off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol engine and it usually will not run, and so the motorist stops — and the harm stops with them. A diesel fed petrol usually starts, idles and drives away as though nothing has happened, whilst your pump grinds. Running isn't the same as fine.
Myth: a two-stroke additive makes it safe to drive home. It is an old workaround, supposed for another fault. What petrol has diluted stays weakened, and the petrol stays in the tank regardless.
If your engine has run, part of the petrol sits in your filter and your lines, not the tank — and your next start pulls it right back through the pump. So the myth "drain your tank yourself and you're sorted" doesn't hold. Clearing petrol into a can at the roadside is also truly dangerous.
How petrol ends up: petrol in a diesel
It's seldom carelessness, and nobody does it on purpose. One way only, since of the nozzles: the smaller petrol one slips inside a diesel filler with almost no resistance, while the diesel one mostly won't fit a petrol motor. That's how the forecourt makes it simple.
It happens when habit and your car stop matching. Any car that's new to you — a hire car, on loan as a courtesy car, or brand new. One petrol and one diesel on the driveway of the same household. A familiar forecourt with the pumps in a different order. A train to catch, and a hurried fill en route to Bottesford. The first fill-up in a diesel Renault Megane after years of driving petrol is exactly the moment it happens. Add a back seat full of children, a phone call or rain, and habit takes over.
Next time you fill up around Easthorpe: avoiding petrol in a diesel
- Check the petrol pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on every forecourt. The label is what counts.
- The first fill in a strange motor is the time to check your filler flap — inside it, or on the cap, many vehicles state which fuel they take.
- One of each in the household? Label your key to your diesel — a coloured fob, a sticker — because meaning to remember is not enough.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump. It sounds daft and it does the trick.
- 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.
- 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 rest. Treat it as a safety net, then keep checking the pump.
- The moment you realise, stop: less petrol inside the tank means a weaker blend. What to do next doesn't change, though — still do not crank it.
Easthorpe: already put petrol in a diesel?
Then, there's just a short order of things. Leave it unstarted, with the ignition switched off too. Ask the staff to help you roll it clear of the petrol pump if you are still on the forecourt, whether that's JET or somewhere else. Then call 0333 366 0103 and tell us what got in, about how much, and if it's run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a separate fault — Easthorpe has a page just for it.
Easthorpe petrol in a diesel tasks: why one costs more than another
The four situations above are four different tasks, so no single quote for this would be fair. Chiefly, the cost moves with which one you are in. Beyond that it is the proportion — how much petrol got in against how much that tank takes — and after that where the car is and whether a van can get to it safely.
That's why our engineers ask three queries before costing rather than after: what got in, how much, and whether it has run. Given those answers, there is a straight figure instead of a range.
About Easthorpe, for a moment
Easthorpe is a suburban area in Leicestershire, situated on the riverside at an elevation of 39 metres. Easthorpe lies near the towns of Bottesford and Muston, and is within commuting distance of Nottingham, which is 14.9 miles away. Easthorpe has a population of around 859 people and is characterised by predominantly detached housing.
Across Leicestershire and in Easthorpe: fuel drain cover
Our vans answering petrol in diesel call-outs in Easthorpe, in the NG postcode area, also work the places around it, Bottesford, Muston and Normanton included. You need not bring your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots we drain.
In Easthorpe and still at the petrol pump?
Nothing beats it: that's where you now are. Turned off it remains; then ring.