How Worried Should You Be? Petrol in a Diesel Car in South Kilworth
Less than you probably are, if it hasn't been started. Petrol resting in a diesel tank does nothing to your engine until something pulls it through the system — the ignition priming the pump, the starter, or the drive itself. So the truthful answer to the first question everyone around South Kilworth asks, "have I ruined it?", is usually no. Keep it like that: leave the engine off then ring Petrol in Diesel. What petrol really does to a diesel, how to gauge how far it's gone, and how to stop it from happening again: that's the rest of this page.
Inside the engine: what petrol in a diesel does
Diesel does two tasks on its way through an engine. It burns, and before it burns it protects. The high-pressure pump and the injectors are made to very fine gaps, and the diesel passing through them is what stops those surfaces from grinding against each other.
Of those two tasks, petrol handles the first badly and the second never. A pump working on a petrol blend is wearing itself out, because petrol is runnier than diesel and takes away the lubrication your fuel system relies on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that's where the clattering comes.
Seen together, they show the shape the issue has. Not contact but movement is what causes the harm. Where the petrol is only inside the tank, it is an issue of fuel, nothing more. A pump that has been working on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with the fuel to the fuel injectors further on.
Petrol in a diesel in South Kilworth: how serious is it? Four cases
Fuelled, and never started: nothing beats it. At a forecourt, and genuinely only there, that petrol is still limited to that tank — since everywhere else the vehicle was driven to reach it. The job is draining and rinsing on the spot.
Ignition on, or started for a second. Once primed, the fuel system has pulled petrol out of that tank as far as the filter and the fuel lines. Drain, flush, see to the filter: still usually easy.
Those few miles driven meant the pump running on fuel diluted by petrol the whole way. How hard your car was driven counts as much as how far, and the work covers the tank, the lines, the fuel filter and clean fuel through the entire system. Driving the children to South Kilworth Church of England Primary School is one sort of trip. A run as far as Leicester, under 15 miles away, is a very different job. So is any mileage on the M6, under 5 miles from South Kilworth, where your engine has been labouring hard throughout.
Driven till it protested. Clattering, an uneven idle, smoke, a throttle that has gone soft. The engine is telling you the fuel is no longer acting like diesel. Leave it wherever it has stopped: a lay-by, a side street, the verge on Rugby Road. A car stopped soon very rarely has long-term damage, since the drain and the flush, which still go first, take care of it.
Petrol in a diesel myths South Kilworth people hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing is removed by topping up — you are left with a bigger tank, still the same mixture. The assumption behind the advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: a current diesel copes with a bit of petrol. Rather, the opposite. Finer components and higher pressure are how a modern diesel runs its fuel, and that makes the protection count more, not less.
The myth that catches people off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it usually will not run, and so the motorist stops — and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile your pump wears. Running is not the same as fine.
Myth: "Add some two-stroke oil and drive the car home." It is an old workaround for a separate fault. That petrol is still in your tank afterwards, and what it has weakened isn't put back.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol sits in the filter and lines, waiting to go right back through your pump at the next start. Besides, petrol cleared into a can by the road is truly hazardous.
Why petrol in a diesel occurs so easily
On purpose? Never. Through carelessness? Seldom, if ever. One way only, since of the nozzles: the slimmer petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol car. That is how the forecourt makes it simple.
The moment habit stops matching the car is the moment it occurs. A new motor, a hire car or a courtesy car. Households running one of each, petrol and diesel. The pumps in a different order on a well-known forecourt. Filling up in a hurry on the way to Rugby, with a train to catch. Exactly the moment it takes place: after years of driving petrol, someone fills a diesel Volkswagen Passat for the first time. With rain, a call arriving, or a car full of children to deal with, your hand simply does what it always has.
Next time you fill up in South Kilworth: 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 petrol pump's label; the colour is only a clue.
- The first fill in a new vehicle is the time to check the filler flap — on it, or on the cap, plenty of cars state the fuel to use.
- Mark your key. In a house with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- Before the nozzle comes off the pump the first time you fuel a hired or new car, say "diesel" out loud. Silly, perhaps, yet it works.
- Whilst you are thinking about something else, this is an easy mistake to make — so put the phone away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to block a petrol nozzle, and add-on devices exist for cars without one. They are a safety net, not a reason to stop checking the pump.
- As soon as you realise, stop: less petrol inside that tank means a thinner mixture. What to do next does not change, though — still do not start it.
Petrol already in a diesel in South Kilworth? Start here
Short and simple, then, is the order of things. Starting it is out, and so is turning on your ignition. The attendants at the forecourt — whether at Esso itself or wherever you filled up — will normally help push it away from the petrol pump if you ask. What was put in, roughly how much, and if it's run: tell us those when you ring 0333 366 0103.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a separate fault — South Kilworth has a page all for it.
South Kilworth petrol in a diesel tasks: why one costs more than another
The four scenarios above are four separate tasks, so no single quote for this would be honest. What moves the cost is chiefly which of them you're in. Where the car is matters too, and whether a technician can safely reach it, after the share of petrol to what your tank holds.
That is why we ask three questions before pricing rather than after: what was put in, how much, and if it's run. With the answers, there is a straight figure rather than a range.
About South Kilworth and where it is
South Kilworth is a small village in Leicestershire, situated in the East Midlands region of England, with a population of around 579 people. South Kilworth sits at an elevation of 138 metres, approximately 14 miles south of Leicester and 76 miles north of London. South Kilworth is characterized by its predominantly detached housing stock, set amidst the rolling countryside near North Kilworth, Stanford on Avon, and Walcote.
Fuel drain cover across Leicestershire, South Kilworth included
South Kilworth rests in the LE postcode area, and the vans that answer petrol in diesel calls there work the spots near it as well — North Kilworth, Stanford on Avon and Walcote among them. Our engineers drain where your car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the pump in South Kilworth?
Nothing beats it: that is where you now are. Leave it turned off, and ring.