Petrol in a Diesel Car in Leven Links: How Worried Should You Be?
Provided it has not been started, worry far less than you probably are. Everyone in Leven Links begins with "have I wrecked it?", and the fair answer is usually no: petrol left inside that tank of a diesel remains harmless till priming, cranking or driving draws it into the fuel system. Keep it that way: leave the motor off then ring Petrol in Diesel. The remainder of this page covers 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.
The motor and petrol in a diesel: what happens
Two tasks fall to diesel on its journey through a motor. It burns, and before it burns it protects. Extremely fine gaps go into your injectors and the high-pressure pump, and only the diesel running through stops those surfaces grinding together.
Petrol does the first job badly and the second not at all. The clattering comes from petrol being designed not to ignite when compressed, which is precisely the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips out the lubrication the fuel system hinges on, and any pump working on such a blend is wearing itself.
Seen together, they make clear what shape the issue has. Not contact but circulation is what does the damage. Where the petrol is only in that tank, it's a fault of fuel, nothing more. Once your pump has been labouring on that petrol, a mechanical issue has started: whatever is shed by a pump that is grinding is carried downstream to the injectors with your fuel.
Petrol in a diesel in Leven Links: how serious is it? Four cases
Fuelled up, never started. The best case there can be. Just that tank has petrol in it, so the task is draining that tank and flushing the system where your car stands. This scenario can only really take place at a forecourt: anywhere else, the vehicle got there by being driven.
A moment's running, or just the ignition on. Once primed, the system has drawn petrol out of your tank as far as the fuel filter and the lines. Drain, flush, deal with the fuel filter: still usually easy.
Those few miles on the road meant your pump running on fuel weakened by petrol throughout. Miles is only half of that; how hard it was driven counts equally. Either way this work includes the tank, the lines, the fuel filter and clean fuel through the entire circuit. On the school run to the local primary school, the mileage is small. Very different a second time: a trip to Dundee, under 25 miles away, or any mileage on the M90, under 25 miles from Leven Links, where the motor kept running hard.
Driven until it protested. Clattering, a ragged idle, smoke, a throttle that has gone soft. What you are hearing is your engine signalling fuel that no longer acts like diesel. Whether it's the verge on Church Road, a lay-by or a side street, stop there and leave it. Permanent damage is very uncommon when a car is stopped early, and the fuel drain and flush-through that still come first deal with it.
What Leven Links drivers get told about petrol in a diesel — and the stories in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing is removed when you top up — the tank simply holds more of the same blend. That advice presumes a diesel fuel system handles petrol by percentage. It doesn't.
Not so: a current diesel copes with a bit of petrol. Rather, the opposite. Lubrication counts more on current diesels, not less, because their fuel runs through smaller components at higher pressure.
"It starts, it drives, so there is no harm" — the myth that trips up most motorists than any other. Any petrol motor fed diesel usually will not run, and so the driver stops and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile the pump grinds. Fine and running aren't the same at all.
An old fix for a separate problem lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." What petrol has thinned remains weakened, and that petrol remains in the tank regardless.
Myth: "Drain your tank yourself and you are sorted." Once the motor has run, some of that petrol is no longer inside the tank: it's in the fuel filter and the lines, and it goes straight back through your pump on the next start. It is also genuinely risky to drain petrol into a can by the kerbside.
Why petrol in a diesel happens so easily
It is rarely carelessness, and no one does it on purpose. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol motor at all. The forecourt makes it simple, and the slip runs one way.
It happens when habit and your car stop matching. Courtesy car, hire car, or a vehicle that's new. Households running one of each, petrol and diesel. Your usual forecourt, its pumps now in a different order. Rushing for a train outside Leven and fuelling up en route. Years of petrol motors behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that's when. Add rain, a phone call or a back seat full of kids, and your hand does what it has always done.
Preventing petrol in a diesel next time you fill up in Leven Links
- The label is what counts, and so check the petrol pump rather than the colour: in the UK unleaded handles are normally green and diesel black, but not on every forecourt.
- The first fill in an unfamiliar vehicle is the time to check the filler flap — on it, or on the cap, plenty of motors state which fuel they take.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of meaning to remember, in a home with one of each.
- Say it before you lift it. On the 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 works.
- Whilst you are thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Add-on devices exist for cars without one, and some diesels come with a filler that will not take a petrol nozzle. Useful — but a safety net at best, never a reason to stop checking the label.
- Stop as soon as you realise. Less petrol in that tank means a thinner blend. It does not change what to do next, which is still not to fire it up.
Already put petrol in a diesel around Leven Links?
In that case, there's only a short order of things. Starting it is out, and so is turning on your ignition. The attendants on the forecourt — whether at Sainsbury's itself or wherever you filled up — will usually help roll it away from the pump if you ask. What went in, about how much, and if it has run: tell us those when you ring 0333 366 0103.
Corrosion and deposits form the problem with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and see its own Leven Links page.
Why one petrol in a diesel task around Leven Links costs more than another
An honest single price doesn't exist here: four situations, four separate jobs. Which of them you are in is chiefly what shifts your cost. Where the vehicle is counts too, and whether a technician can safely get to it, after the proportion of petrol to what that tank takes.
What went in, how much, and whether it has run — three queries our engineers ask before costing, not after, for exactly that reason. The answers change a range into a straight figure.
About Leven Links, briefly
Leven Links is a coastal suburban area in Fife, situated near the town of Leven and overlooking the Firth of Tay. Leven Links has a relatively low elevation of around 9 metres, reflecting its seaside location. Leven Links is characterized by predominantly flat-type housing, which is common in many Scottish coastal towns.
Across Fife and in Leven Links: fuel drain cover
Our vans answering petrol in diesel calls in Leven Links, in the KY postcode area, equally work the spots around it, Leven, Sillerhole and Scoonie included. Our technicians drain where the vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
In Leven Links and still at the petrol pump?
No position is better: that is where you now are. Turned off it remains; then phone.