Petrol in a Diesel Car in Kirby-le-Soken: How Worried Should You Be?
If it hasn't been started, worry far less than you probably are. Everyone in Kirby-le-Soken starts with "have I wrecked it?", and the fair answer is generally no: petrol left inside that tank of a diesel remains harmless until priming, cranking or driving pulls it into the fuel system. To leave the car that way, call Petrol in Diesel and leave the engine alone. The rest of this page sets out what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it doesn't happen to you again.
Your engine and petrol in a diesel: what happens
Passing through an engine, diesel does two jobs at once. It lubricates to begin with, and only then does it burn. Built to very fine gaps, the injectors and your pump depend on your diesel flowing through them to stop their surfaces wearing against one another.
Of those two jobs, petrol handles the first poorly and the second not at all. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump on that mixture to wear itself. It's equally made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the clattering.
Put those together and the shape of the issue is clear. The damage is done by movement, not by contact. Petrol in the tank is a fuel fault. Whatever a worn pump sheds travels on, borne by your fuel, into your injectors further along, which is why a pump that has worked on that petrol is where a mechanical issue begins.
Petrol in a diesel around Kirby-le-Soken: how bad is it? Four cases
Fuelled up, not once started. The best case there is. Only that tank has petrol in it, and so the job is emptying the tank and purging the system where the car sits. This situation can only truly take place on a forecourt: anywhere else, the car got there by being driven.
A brief spell of running, or merely your ignition on. With the system primed, the lines and filter already hold petrol that has come from that tank. Drain, flush, see to the filter: still normally straightforward.
Driven a couple of miles. Now your pump has spent these miles labouring on thinned fuel. Tank, lines, filter, then fresh fuel run through the whole system: that's this work, and the way your car was driven matters as much as the mileage. A school run to Kirby Primary Academy is one matter. Getting as far as Colchester, under 15 miles away, makes a very different job — as does any distance on the M2, under 50 miles from Kirby-le-Soken, with the engine running hard the whole time.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone ragged. The motor is telling you the fuel is no longer acting like diesel. Whether it's the verge on Horsey Road, a lay-by or a side road, stop where you are then leave it. The drain and flush-through still go first, and they sort it out: if a vehicle is pulled over soon, long-term damage is very rare.
What Kirby-le-Soken people get told about petrol in a diesel — and the stories in it
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. A fuller tank of the same mixture is all it gives, because topping up removes nothing. Percentage is not how a diesel fuel system copes with petrol, however much that advice supposes.
"Current diesels can handle a little petrol" — a myth, and closer to the opposite. A newer diesel runs its fuel through smaller components at higher pressure, which makes the protection matter more, not less.
Myth: "If it starts and drives, there's no harm done." This is the one that fools motorists. Diesel in a petrol motor generally leaves a motor that will not run: the motorist stops, and so does the harm. A diesel fed petrol usually starts, idles and drives away as though nothing has happened, while your pump grinds. Being able to run isn't the same as being fine.
Myth: "Add some two-stroke oil and drive the car home." It is an old workaround for a different problem. What petrol has diluted remains thinned, and the petrol stays in that tank anyway.
Myth: "Drain the tank yourself and you're sorted." Once your engine has run, some of that petrol is no longer inside that tank: it is in the filter and the lines, and it goes right back through your pump at your next start. It is also genuinely risky to drain petrol into a can by the roadside.
Why petrol in a diesel occurs so easily
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle generally will not fit a petrol car, yet the smaller petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake simple, and just in one direction.
Habit and the vehicle falling out of step is when it happens. A new vehicle, a hire car or a courtesy car. A household with one petrol and one diesel on the driveway. The pumps in a different order on a well-known forecourt. Racing for a train outside Kirby Cross and filling up en route. Exactly the moment it happens: after years of driving petrol, someone fills a diesel Renault Clio for the first time. The hand repeats what it has always done once you add rain, a phone call or a back seat full of children.
Next time you fill up around Kirby-le-Soken: preventing petrol in a diesel
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Read the petrol pump's label; the colour is only a hint.
- Many motors state the fuel type inside the filler flap or on the cap, and so check there on your first fill in a motor you don't know.
- Good intentions count for less than a sticker or a fob in a bright colour on the diesel's key when a home has one of each. So label it.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump. It seems silly and it does the trick.
- Mistakes like this are simple to make while your mind is on something else, and so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to block a petrol nozzle, and aftermarket devices are available for the remainder. Treat it as a backstop, and keep checking the petrol pump.
- Less petrol makes a thinner mixture, so stop as soon as you realise — while remembering that your next step is unchanged. It's still not to fire it up.
Put petrol in a diesel around Kirby-le-Soken already?
Short and simple, then, is the order of things. Leave it unstarted, with the ignition off too. Still on the forecourt, at Texaco or anywhere else? Ask the staff to help you roll the car clear of the petrol pump. What was put in, roughly how much, and if it has run: tell us that when you phone 0333 366 0103.
Corrosion and deposits form the problem with AdBlue, where petrol brings lost lubrication. So if it was AdBlue, say so — and read its own Kirby-le-Soken page.
Why one petrol in a diesel job in Kirby-le-Soken costs more than another
The four scenarios above are four different tasks, so no single quote for this would be fair. What shifts your cost is mostly which of them you're in. Two things come after that: the petrol that was put in as a proportion of what the tank takes, then the spot the car is in and whether a technician can get to it safely.
What went in, how much, and whether it's run — three questions our technicians ask before costing, not after, for precisely that reason. Their replies are what turn a range into one firm number.
About Kirby-le-Soken itself
Kirby-le-Soken is a small village on the Essex coast, situated near the mouth of the River Thames and close to the seaside towns of Frinton-on-Sea and Clacton-on-Sea. Kirby-le-Soken lies at a low elevation of around 8 metres, with its detached houses and quiet streets reflecting its role as a residential community. Kirby-le-Soken is also near to the villages of Kirby Cross and Lane End, and is within commuting distance of Colchester and London.
Fuel drain cover across Essex, Kirby-le-Soken included
Kirby Cross, Lane End and Frinton-on-Sea are among the places near Kirby-le-Soken that the same teams work, answering petrol in diesel jobs across Kirby-le-Soken's CO postcode area. Our technicians drain where the car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
At the pump around Kirby-le-Soken, still?
Then, you could not be in a better position. Turned off it remains; then call.