Borrowfield: Petrol in a Diesel Car? How Worried to Be
If it has not been started, worry less than you probably are. Everyone around Borrowfield starts with "have I wrecked it?", and the fair answer is normally no: petrol resting inside the tank of a diesel stays harmless till priming, cranking or driving pulls it into your fuel system. Keep it that way: leave the motor off and phone Petrol in Diesel. Below, 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.
Inside your engine: what petrol in a diesel does
Two jobs fall to diesel on its journey through a motor. It ignites, and before it combusts it protects. The high-pressure fuel pump and your injectors are designed to extremely fine clearances, and your diesel passing through them is what keeps those surfaces from wearing against one another.
The second task petrol doesn't do at all, and the first it does poorly. The knocking comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips away the lubrication the system depends on, and any pump working on such a mix is wearing itself.
The shape of the issue is plain once you put those together. The harm is done by movement, not by contact. Petrol in a tank is a fuel fault. Whatever a worn pump sheds goes on, borne by your fuel, into your injectors downstream, which is why a pump that has been working on the petrol is where a mechanical issue begins.
Petrol in a diesel in Borrowfield: how bad is it? Four cases
The best case there can be: filled up, never started. Just the tank has petrol in it, so the job is clearing that tank and purging the system where the car sits. This situation can only truly happen on a forecourt: anywhere else, the car got there by being driven.
Your ignition switched on, or a brief start. The system has been bled, and so petrol has left that tank and reached the fuel filter and the lines. Still generally straightforward: drain, flush, and your filter dealt with.
Your pump now spent a few miles on weakened fuel — that is what driving the vehicle does. The work is that tank, the lines, the fuel filter and fresh fuel through the entire system, and how hard your car was driven counts as much as how far. A school run to the local primary school is one thing. A run as far as Dundee, under 50 miles away, is a very different job. So is any miles on the M90, under 50 miles from Borrowfield, where your engine has been labouring hard the whole time.
Driven on until it complained — clattering, smoke, a ragged idle, a soft throttle. That is your engine telling you its fuel has stopped behaving like diesel. Pull up wherever you are — the verge on Coronation Way, a lay-by, a side street — and leave it where it is. Lasting damage is very uncommon if a car is pulled over early, and the drain and flush-through that still come first take care of it.
What Borrowfield people get told about petrol in a diesel — and the myths in it
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing is removed by topping up — you are left with a fuller tank, still the same mixture. That guidance supposes a diesel fuel system tolerates petrol by percentage. It doesn't.
"Current diesels can handle a little petrol" — a myth, and closer to the opposite. Lubrication matters more on modern diesels, not less, since their fuel runs through smaller components at higher pressure.
Myth: "If it starts and drives, there's no damage done." This is the one that catches motorists. The motorist of a petrol motor fed diesel usually stops, since it will not run, and the harm stops there. A diesel fed petrol normally starts, ticks over and drives away as though nothing has happened, while the pump wears. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive the car home." It's an old workaround for a different problem. The petrol is still inside the tank afterwards, and whatever it has weakened is not put back.
If the motor has run, part of that petrol is in your filter and your lines, not that tank — and your next start pulls it right back through the pump. So the myth "drain your tank yourself and you're sorted" does not stand up. And, a can of petrol drained by the roadside is truly hazardous.
Petrol in a diesel: how does it occur?
Nobody does it on purpose, and it is rarely carelessness. One way only, because of the nozzles: the narrower petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one mostly won't fit a petrol vehicle. That is how the forecourt makes it easy.
The moment habit stops matching the car is the moment it happens. Courtesy car, hire car, or a vehicle that is brand new. One petrol and one diesel on the driveway of the same household. The pumps in a different order on a familiar forecourt. A hurried fill en route to Montrose with a train to catch. Years of petrol motors behind you, a diesel Renault Megane in front of you at the forecourt for its first tank — that's when. Your hand repeats what it has always done once you add rain, a phone call or a back seat full of children.
Borrowfield drivers: how to prevent petrol in a diesel next time
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Check the pump's label; the colour is just a clue.
- Many motors state the fuel inside your filler flap or on the cap, so check it on your first fill in any vehicle you don't know.
- One of each in the house? Label your key to your diesel — a bright fob, a sticker — since intending to remember is not enough.
- 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 sounds silly and it works.
- Tuck the phone away. This is an easy mistake to make whilst you're thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to block a petrol nozzle, and add-on devices exist for the remainder. Count it as a backstop, then keep reading the petrol pump.
- Stop the moment you realise. Less petrol in the tank means a weaker blend. It doesn't change what to do next, which is still not to fire it up.
Already put petrol in a diesel in Borrowfield?
Short and simple, then, is the order of things. Never crank it, and don't turn your ignition on. If you're still on the forecourt — Asda or anywhere else — ask the staff to help you push the vehicle clear of the pump. Call 0333 366 0103 next, with three facts — the fuel, the approximate amount, and whether it's run.
Corrosion and deposits are the issue with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and read its own Borrowfield page.
Borrowfield petrol in a diesel tasks: why one costs more than another
There is no honest single quote for this, because the four scenarios above are four different jobs. What shifts your cost is mostly which of them you're in. After that it is the share — how much petrol was put in against how much the tank takes — and then where the car is and whether a technician can reach it safely.
What was put in, how much, and if it has run — three queries our technicians ask before quoting, not after, for exactly that reason. The replies turn a range into a straight figure.
About Borrowfield and its setting
Borrowfield is a coastal suburban area in Angus, Scotland, with a population of around 2570 people. Borrowfield sits at a low elevation of 11 metres, near the towns of Hillside, Montrose, and Inchbraoch. Borrowfield is characterized by its predominance of terraced housing, typical of many Scottish coastal towns. Borrowfield is located near the city of Dundee, which is 26.9 miles away.
Borrowfield and Angus: where our fuel drain cover runs
The vans answering petrol in diesel call-outs in Borrowfield, in the DD postcode area, also work the spots around it, Hillside, Montrose and Inchbraoch among them. No need to move your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places where we work.
In Borrowfield and still at the pump?
Then you are in the best spot there is. Keep it off. Ring.