Petrol in a Diesel Car in Scarcroft: How Worried Should You Be?
Not started? Then less worried than you likely feel. Till the ignition primes the pump, the starter turns, or your vehicle is driven, petrol in a diesel tank just sits there and does nothing. Which means the truthful reply to the first Scarcroft question — "have I ruined it?" — normally no. Keep it that way: leave your engine off and phone Petrol in Diesel. The rest 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 doesn't happen to you a second time.
Inside the motor: what petrol in a diesel does
Two tasks fall to diesel on its route round a motor. It combusts, and before it burns it lubricates. Very fine clearances go into the injectors and your high-pressure pump, and just the diesel running through stops those surfaces grinding together.
Badly at the first, not at all at the second: that is petrol. A pump running on a petrol blend is wearing itself out, since petrol is thinner than diesel and takes away the protection your fuel system relies on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that is where any knocking comes.
Taken together, they make clear what shape the problem takes. Not contact but movement is what does the harm. Where the petrol is only in your tank, it's a problem of fuel, nothing more. After the pump has been labouring on that petrol, a mechanical issue has started: anything shed by a pump that's wearing is carried downstream to the fuel injectors with your fuel.
Four situations our technicians see around Scarcroft: how bad is petrol in a diesel?
Filled but not once started — as good as it gets. Only that tank has petrol in it, so the task is clearing your tank and rinsing the fuel system where the vehicle sits. This scenario can only truly take place on a forecourt: anywhere else, your car got there by being driven.
Started for a moment, or only your ignition on. The fuel system has been primed, and so petrol has left your tank and reached the fuel filter and the lines. Drain, flush, see to your filter: still usually simple.
Driven a couple of miles. Now your pump has spent these miles running on diluted fuel. The work is your tank, the lines, your filter and clean fuel through the entire circuit, and how hard your car was driven counts as much as how far. Driving the children to Bardsey Primary Academy is one kind of trip. Driving as far as Leeds, under 10 miles away, makes a very different job — as does any mileage on the A1(M), under 5 miles from Scarcroft, with the motor working hard the whole time.
It protested, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. What you are hearing is the engine signalling fuel that no longer runs like diesel. Leave it wherever it stops: a lay-by, a quiet street, the verge on Syke Lane. Permanent damage is very unusual when a car is pulled over early, and the drain and flush-through that still come first deal with it.
What Scarcroft drivers get told about petrol in a diesel — and the myths in it
False: topping up to full with diesel makes it fine. It does not. Nothing is removed by topping up — you're left with a fuller tank, still the same mixture. That guidance supposes a diesel fuel system tolerates petrol by percentage. It does not.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through smaller components: that's how a modern diesel handles its fuel, and so the protection matters more, not less.
This is the one that fools motorists. Myth: "If it starts and drives, there is no harm done." A petrol engine fed diesel generally will not run, so the motorist stops and the harm stops with them. Whilst your pump grinds, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Running isn't the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct fault. That petrol is still in that tank after that, and what it has thinned is not put back.
Once your engine has run, part of that petrol is in the filter and your lines, not that tank — and the next start pulls it straight back through your pump. So the myth "drain the tank yourself and you're sorted" does not stand up. On top of that, petrol drained into a can by the road is genuinely dangerous.
Petrol in a diesel: how does it take place?
On purpose? Never. Through carelessness? Seldom, if ever. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol motor at all. The forecourt makes it simple, and the error runs one way.
Habit and the car getting out of step is when it takes place. A motor that's new to you — hired, on loan as a courtesy car, or brand new. A household with one petrol and one diesel on the driveway. A forecourt you know, only with its pumps arranged differently. Fuelling up in a rush on the way to Cross Gates, with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: precisely when it happens. Throw in rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
How to prevent petrol in a diesel at your next fill-up in Scarcroft
- A green handle for unleaded and black for diesel is usual in the UK — yet not on every forecourt. Trust the label on the pump, not the colour.
- The first fill in a strange car is the time to check your filler flap — on it, or on the cap, many motors state which fuel to use.
- A coloured fob or a sticker on your diesel's key does more than any amount of intending to remember, for a home with one of each.
- Before the nozzle leaves the petrol pump the first time you fuel a hired or new vehicle, say "diesel" out loud. Daft, perhaps, but it works.
- Mistakes like this are straightforward to make while your mind is on something else, and so the phone goes away.
- Some diesels come with a filler designed to reject a petrol nozzle, and devices you can add are available for motors without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the petrol pump.
- Stop the moment you notice. Less petrol inside the tank means a thinner mix. It does not change what to do next, which is still not to crank it.
Already put petrol in a diesel around Scarcroft?
Then the order of things is short. Do not switch the ignition on, and do not crank it. Yet at the forecourt, at BP or anywhere else? Ask the staff to help you push the vehicle away from the pump. Next, 0333 366 0103. We will ask what went in, about how much, and if it's been run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a separate problem — Scarcroft has a page just for it.
Scarcroft petrol in a diesel tasks: why one costs more than another
Four separate jobs lie behind the four situations above — which is why there is no fair single quote. Which of them you are in is chiefly what moves your cost. Where the vehicle is matters too, and whether a van can safely get to it, after the ratio of petrol to what your tank holds.
What got in, how much, and if it's run — three questions our engineers ask before pricing, not after, for exactly that reason. Those replies change a range into a straight figure.
About Scarcroft
Scarcroft is a village in West Yorkshire, situated on the banks of a river at an elevation of around 95 metres. Scarcroft lies close to the city of Leeds, approximately 6.5 miles away, and is near other local places such as Bracken Park and Bardsey. Scarcroft has a population of around 738 people and is characterised by its predominantly detached housing stock.
Fuel drain cover in Scarcroft and across West Yorkshire
Scarcroft sits in the LS postcode area, and our vans that answer petrol in diesel call-outs there work the places around it as well — Bracken Park, Bardsey and East Rigton among them. A forecourt, a supermarket car park, a lay-by or your own drive are all spots our technicians drain, and your vehicle doesn't need to move to us.
Scarcroft: still at the petrol pump?
Then, you could not be in a better spot. Ring, and keep it turned off.