Should You Worry? Petrol in a Diesel Car in Inverurie
Provided it has not been started, worry far less than you likely are. Till the ignition primes your pump, your starter turns, or the car is driven, petrol in a diesel tank simply waits there and does no harm. Which means the honest reply to the first Inverurie query — "have I wrecked it?" — usually no. Petrol in Diesel is who to call, with your motor kept off, so it remains that way. Below, you will find what petrol actually does inside a diesel, how far it may have gone, and how to stop it happening to you again.
What petrol in a diesel does to the motor
Diesel has two jobs on its way through an engine. Before it combusts, it lubricates — then it ignites. The high-pressure pump and your injectors are made to very fine tolerances, and your diesel passing through them is what keeps those surfaces from wearing down against each other.
Of those two tasks, petrol manages the first badly and the second never. Being less viscous than diesel, petrol strips out the protection a fuel system needs, leaving a pump running on the blend wearing itself. It's equally made to resist igniting under compression — the reverse of what a diesel needs — which is where you hear the knocking.
Put these together and the shape of the issue is clear. The damage is done by circulation, not by contact. A tank with petrol in it is a fuel issue. The beginning of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds moves on with the fuel to the fuel injectors downstream.
How bad is petrol in a diesel? Four situations our technicians see around Inverurie
The best case there is: filled up, not once started. That petrol is inside that tank and just your tank, and the task is a drain and a flush where the vehicle stands. This is the one scenario that can only truly occur at a forecourt, since anywhere else your car has been driven to get there.
Ignition on, or started for a moment. Your system has been bled, and so petrol has left the tank and reached your filter and the lines. Still normally easy: drain, flush, and the fuel filter seen to.
Driven a couple of miles. Now the pump has spent those miles labouring on weakened fuel. How hard the car was driven matters as much as how far, and the work covers the 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. Any mileage on the M90, over 50 miles from Inverurie, means the motor has worked hard throughout, and a run to Aberdeen, under 15 miles away, makes a very different task too.
Driven on till it complained — clattering, smoke, an uneven idle, a dead throttle. The fuel isn't behaving like diesel any more, and your engine is telling you. Whether it's the verge on Station Road, a lay-by or a side road, stop where you are and leave it. The drain and flush-through still come first, and they deal with it: if a car is pulled over quickly, permanent damage is very uncommon.
What Inverurie drivers get told about petrol in a diesel — and the myths in it
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up takes out nothing; it gives you a fuller tank of the same mix. Percentage isn't how a diesel fuel system tolerates petrol, whatever that guidance presumes.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." Protection counts more on current diesels, not less, because their fuel passes through smaller components at higher pressure.
The myth that catches drivers off guard: if it starts and drives, it must be unharmed. Any petrol motor fed diesel generally will not run, and so the driver stops and the damage stops with them. Feed petrol to a diesel and it normally starts, idles and drives away as if nothing has happened — all while its pump is wearing. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive it home." It's an outdated workaround for a separate issue. The petrol is still inside your tank after that, and what it has thinned isn't put back.
Once your engine has run, part of that petrol is in the filter and your lines, not the tank — and your next start sends it straight back through the pump. So the myth "drain that tank yourself and you're sorted" doesn't stand up. Also, a can of petrol filled by the roadside is truly dangerous.
Petrol in a diesel: how does it occur?
It is seldom carelessness, and no one does it on purpose. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol vehicle at all. The forecourt makes it simple, and the error runs one way.
Habit and the vehicle falling out of step is how it takes place. Any motor that is new to you — hired, on loan as a courtesy car, or just bought. Two motors on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. Fuelling up in a rush on the way to the nearest station, with a train to catch. Exactly the moment it happens: after years of driving petrol, a driver fills a diesel Renault Megane for the first time. Throw in a back seat full of kids, a phone call or rain, and the hand takes over.
Inverurie people: how to prevent petrol in a diesel next time
- The label is what matters, and so read the pump instead of the colour: in the UK unleaded handles are normally green and diesel black, yet not on each forecourt.
- In a car you do not know, look inside the flap over your filler or at the cap before your first fill: many vehicles print the fuel there.
- Label your key. In a household with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- Before the nozzle comes off the pump the first time you fuel a hired or new motor, say "diesel" out loud. Daft, perhaps, but it does the trick.
- Put your phone away. This is an easy mistake to make whilst you're thinking about something else.
- Add-on devices exist for motors without one, and some diesels come with a filler that will not take a petrol nozzle. Useful — but a backstop at best, never a reason to stop checking the label.
- Less petrol means a thinner blend, so stop as soon as you notice — though remembering that your next step is unchanged. It is still not to fire it up.
Put petrol in a diesel around Inverurie already?
The order of things is short, then. Never fire it up, and don't switch the ignition on. Still at the forecourt, at Tesco or anywhere else? Ask the staff to help you push it clear of the petrol pump. Then call 0333 366 0103 and tell us what was put in, roughly how much, and if it has run.
Corrosion and deposits are the trouble with AdBlue, where petrol means lost protection. So if it was AdBlue, say so — and read its own Inverurie page.
One petrol in a diesel job in Inverurie costs more than another. Why?
There is no fair single quote for this, since the four scenarios above are four different jobs. Which of them you are in is chiefly what shifts your cost. Beyond that it's the proportion — how much petrol went in against how much your tank holds — and then where the vehicle is and whether a technician can reach it safely.
That is why our engineers ask three questions before quoting instead of after: what got in, how much, and whether it's run. Those replies change a range into a straight figure.
About Inverurie, for a moment
Inverurie is a town situated in the heart of Aberdeenshire, Scotland, where the rivers Ury and Don meet. It is located near the coast, but inland from the North Sea, and lies to the north-west of Aberdeen. The town's riverside setting makes it a notable spot in the region. Inverurie is a characteristic example of a Scottish town with a rich history and natural surroundings.
Inverurie and Aberdeenshire: where our fuel drain cover reaches
The teams answering petrol in diesel call-outs around Inverurie, in the AB postcode area, also work the spots near it, Port Elphinstone, East Balhalgardy and Hillbrae among them. 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 Inverurie and still at the petrol pump?
In that case, you could not be in a better position. Keep it off. Ring.