Should You Worry? Petrol in a Diesel Car in Elgin
Less than you probably are, if it hasn't been started. Until the ignition primes your pump, the starter cranks, or your vehicle is driven, petrol in a diesel tank just waits there and does no harm. Which makes the truthful reply to that first Elgin query — "have I ruined it?" — usually no. Leave your engine off then ring Petrol in Diesel — that is how you keep it that way. Further down, this page sets out what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you a second time.
What petrol in a diesel does to the engine
Two jobs fall to diesel on its route through a motor. Oiling comes before burning; it does both. The high-pressure pump and your injectors are designed to very fine gaps, and the diesel passing through them is what keeps those surfaces from grinding against one another.
Petrol does the first job 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 the blend wearing itself. It is equally made to resist igniting under compression — the reverse of what a diesel needs — which is why you get the clattering.
Together, those leave the shape of the issue plain. The damage is done by movement, not by contact. Where that petrol is only in the tank, it's a fault of fuel, nothing more. A pump that has been running on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with the fuel to your injectors downstream.
Petrol in a diesel around Elgin: how serious is it? Four cases
Filled but not once started — as good as it gets. The petrol is inside the tank and just the tank, and the task is a drain and a flush where your car stands. This is the one scenario that can only really occur at a forecourt, since anywhere else your car has been driven to get there.
A brief spell of running, or just the ignition on. With your system primed, your lines and filter already contain petrol that came from your tank. Drain, flush, see to your filter: still usually easy.
Driven a few miles. Now your pump has spent these miles labouring on diluted fuel. Miles is only half of that; how hard it was driven counts equally. Either way this work includes that tank, your lines, the filter and clean fuel through the whole circuit. On the school run to the local primary school, the mileage is short. Very different a second time: a run to Inverness, under 50 miles away, or some miles on the M90, over 50 miles from Elgin, where the motor never stopped working hard.
Driven till it protested. Rattling, a ragged idle, smoke, a throttle that has gone soft. The motor is telling you the fuel is no longer behaving like diesel. Stop wherever you are — the verge on A96, a lay-by, a side street — and leave the car there. A vehicle stopped quickly very rarely has long-term damage, since the fuel drain and the flush-through, which still come first, deal with it.
What Elgin people get told about petrol in a diesel — and the myths in it
Myth: topping up to full with diesel makes it fine. It doesn't. Topping up takes out nothing; it gives you a fuller tank of the same mixture. The assumption behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
"Modern diesels can handle a little petrol" — a myth, and closer to the reverse. Finer parts and higher pressure are the way a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
Myth: "If it starts and drives, there is no damage done." This is the one that catches drivers. Diesel in a petrol motor usually means a motor that won't run: the driver stops, and so does the damage. While the pump wears, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Being able to run isn't the same as being fine.
Myth: a two-stroke additive lets you to drive home. It was an old fix, supposed for another problem. None of what petrol diluted is put back by it — and afterwards, that tank still contains that petrol.
Once the motor has run, part of that petrol sits in the filter and the lines, not the tank — and the next start pulls it right back through the pump. So the myth "drain that tank yourself and you are sorted" does not hold. Also, a can of petrol filled by the kerbside is truly dangerous.
Petrol in a diesel: how does it occur?
No one does it on purpose, and it's rarely carelessness. The petrol nozzle is the narrower of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol car at all. The forecourt makes it easy, and the error runs one way.
It happens when habit and your car stop matching. A new vehicle, a hire car or a courtesy car. Households running one of each, petrol and diesel. The pumps in a different order on a familiar forecourt. A train to catch, and a hurried fill on the way to the nearest station. A new-to-you diesel Volkswagen Tiguan, its first fuelling, and a driver accustomed to petrol: precisely when it occurs. With rain, a call coming in, or children to deal with, your hand simply does what it always has.
Elgin drivers: how to prevent petrol in a diesel next time
- Read the 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 — on it, or on the cap, many motors state which fuel to use.
- Label the key. In a household with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- "Diesel", aloud, before you lift the nozzle — every time a new or hired car gets its first tank. It seems silly. It does the trick.
- Thinking about something else is when this becomes an easy mistake to make, so put the phone away then keep your mind on the pump.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject a petrol nozzle, and add-on devices exist for cars without one. They are a safety net, not a reason to stop checking the petrol pump.
- Stop as soon as you realise. Less petrol in that tank means a weaker mix. It does not change what to do next, which is still not to start the car.
Petrol already in a diesel in Elgin? Start here
Then the order of things is brief. Don't start the vehicle, and don't turn the ignition on. If you're still at the forecourt — Tesco or anywhere else — ask the staff to help you roll the car clear of the petrol pump. Then call 0333 366 0103 and tell us what went in, about how much, and whether it's run.
If it was AdBlue and not petrol, say so. That's a different problem — corrosion and deposits rather than lost lubrication — and it has its own page for Elgin.
Elgin petrol in a diesel tasks: why one costs more than another
An honest single quote does not exist here: four situations, four separate tasks. The scenario itself does most of the work of moving the cost. Two things follow that: the petrol that was put in as a share of what that tank holds, then the place the vehicle is in and whether our van can reach it safely.
Three queries come first, before quoting, rather than after — what got in, how much, has it run — and this is the reason. Those replies turn a range into a straight figure.
About Elgin and where it is
Elgin is a town situated on the River Lossie in Moray, Scotland, with a relatively low elevation of 18 metres above sea level. Elgin lies approximately 35 miles east of Inverness and is surrounded by smaller settlements such as Bishopmill and New Elgin. Elgin has a population of around 14,000 people and predominantly features semi-detached housing. Elgin is located a significant distance from major cities like London, at around 443 miles away.
Fuel drain cover around Elgin and across Moray
Bishopmill, New Elgin and Moycroft are among the locations near Elgin that the same vans work, answering petrol in diesel call-outs across Elgin's IV postcode area. No need to bring the car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations we drain.
Still at the pump around Elgin?
Nothing beats it: that's where you now are. Ring, and leave it switched off.