Thorpe Edge: Petrol in a Diesel Car? How Worried to Be
If it has not been started, you can worry far less than you probably are. Everyone around Thorpe Edge begins with "have I ruined it?", and the honest answer is generally no: petrol left in that tank of any diesel remains harmless till priming, cranking or driving draws it into the fuel system. Leave your engine off then call Petrol in Diesel — that is how you keep it like that. The remainder of this page sets out what petrol really does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you a second time.
Inside the engine: what petrol in a diesel does
On its way through a motor, diesel does two tasks. Lubricating comes before burning; it does both. Your high-pressure pump and your injectors are made to extremely fine gaps, and your diesel passing through them is what keeps those surfaces from wearing against one another.
Of those two jobs, petrol manages the first poorly and the second never. Being less viscous than diesel, petrol strips out the protection a fuel system needs, leaving a pump running on that mixture to wear itself. It's also made to resist igniting under compression — the reverse of what a diesel needs — which is why you hear the rattling.
Put those together and the shape of the problem is clear. Contact does not do the damage — circulation does. Petrol in the tank is a fuel fault. Whatever a worn pump sheds travels on, carried by your fuel, into the fuel injectors further along, which is why a pump that has worked on that petrol is where a mechanical problem starts.
Petrol in a diesel in Thorpe Edge: how bad is it? Four cases
Fuelled but never started — the best it gets. The petrol is in the tank and just the tank, and the task is a drain and a flush where your car sits. This is the one scenario that can only really take place on a forecourt, because anywhere else the vehicle has been driven to get there.
Your ignition turned on, or a short start. Petrol has left that tank and reached your filter and the fuel lines, because the fuel system has been primed. Drain, flush, deal with your filter: still normally simple.
Your pump has spent a few miles on weakened fuel — that is what driving the car does. How hard the vehicle was driven matters as much as how far, and the work takes in the tank, the fuel lines, your filter and fresh fuel through the whole system. Driving the children to Our Lady and St Brendan's Catholic Primary School, A Voluntary Academy is one sort of trip. Any distance on the M606, under 5 miles from Thorpe Edge, means the motor working hard throughout, and a run to Bradford, under 3 miles away, is a very different task too.
Driven until it protested. Rattling, a ragged idle, smoke, a throttle that has gone soft. That is your engine telling you its fuel no longer is behaving like diesel. Stop on the spot — on the verge on Bridgegate Way, at the kerb, down a side road — and don't move it again. The drain and flush-through still go first, and they take care of it: if a car is pulled over early, lasting damage is very rare.
Petrol in a diesel stories Thorpe Edge motorists hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. A bigger tank of the same mix is all you get, since topping up takes out nothing. That guidance supposes a diesel fuel system tolerates petrol by percentage. It doesn't.
Not so: a newer diesel copes with a bit of petrol. Rather, the reverse. Protection counts more on newer diesels, not less, since their fuel passes 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. Feed diesel to a petrol engine and it normally will not run, and so the motorist stops — and the harm stops with them. Feed petrol to a diesel and it usually fires up, idles and drives away like nothing has happened — all while its pump wears. 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 fix for a separate issue. What petrol has diluted stays diluted, and that petrol remains inside that tank anyway.
Once your engine has run, part of that petrol is in your filter and the lines, not the tank — and your next start sends it straight back through the pump. So the myth "drain your tank yourself and you're sorted" doesn't hold. And, a can of petrol filled at the roadside is genuinely risky.
How does petrol in a diesel happen?
No one does it on purpose, and it is rarely carelessness. A diesel nozzle generally will not fit a petrol motor, yet the smaller petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake easy, and only in one direction.
The moment habit stops matching your car is the moment it occurs. Courtesy car, hire car, or a vehicle that's brand new. A household with one petrol and one diesel on the drive. The pumps in a different order on a well-known forecourt. Fuelling up in a rush en route to Apperley Bridge, with a train to catch. The first fill-up in a diesel Volkswagen Passat after years of driving petrol is exactly the moment it happens. With rain, a call coming in, or a car full of children to deal with, your hand simply does what it always has.
Next time you fill up around Thorpe Edge: preventing petrol in a diesel
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Check the petrol pump's label; the colour is just a hint.
- In a car you do not know, look inside the flap over your filler or at the cap before your first fill: many cars print the fuel there.
- One of each in the household? Label the key to the diesel — a coloured fob, a sticker — because intending to remember isn't 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 seems daft and it works.
- 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.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to refuse a petrol nozzle, and add-on devices are available for the rest. Treat it as a backstop, and keep reading the petrol pump.
- Stop the moment you notice. Less petrol in the tank means a weaker mix. It doesn't change what to do next, which is still not to start the car.
Put petrol in a diesel in Thorpe Edge already?
The order of things is brief, then. Do not fire it up, and do not switch the ignition on. Ask the staff to help you roll it away from the petrol pump if you are still on the forecourt, whether that is Sainsbury's or somewhere else. What got in, roughly how much, and if it's run: tell us those when you call 0333 366 0103.
Say so if it was AdBlue rather than petrol: it's a separate issue, with its own page for Thorpe Edge, because AdBlue brings corrosion and deposits rather than lost protection.
What makes one Thorpe Edge petrol in a diesel task cost more than the next
There's no fair single quote for this, because the four scenarios above are four different tasks. Chiefly, your cost moves with which one you are in. The share matters next, meaning how much of that tank is petrol, and then the location of your car and whether getting to it is safe for a technician.
Before any quote, not after, we ask three questions: your fuel that got in, its volume, and if it has run. That's why. A range turns into a straight figure once the replies are in.
About Thorpe Edge and its setting
Thorpe Edge is a suburban area in West Yorkshire, situated near the River Aire and close to the city of Bradford. Thorpe Edge has a mix of housing types, but semi-detached homes are predominant, and the area is characterized by its relatively low elevation of 156 metres. Thorpe Edge is located near several other suburban areas, including Bank Top, Greengates, and Eccleshill, and is about 2.8 miles from Bradford city centre. Thorpe Edge is also within commuting distance of larger cities, with London approximately 173.4 miles to the south.
Fuel drain cover across West Yorkshire, Thorpe Edge included
Bank Top, Greengates and Eccleshill are among the locations near Thorpe Edge that the same vans work, answering petrol in diesel jobs across Thorpe Edge's BD postcode area. No need to move the car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots we drain.
Still at the petrol pump in Thorpe Edge?
Then you are in the best spot there is. Leave the vehicle switched off, then ring.