Should You Worry? Petrol in a Diesel Car in Camp Field
If it hasn't been started, you can worry far less than you likely are. "Have I ruined it?" is the first thing anyone around Camp Field asks, and the honest answer is usually no, since petrol resting in a diesel tank harms nothing until it is dragged through your fuel system — by ignition priming, by the starter, or by driving. To leave it that way, call Petrol in Diesel then leave your motor alone. The remainder of this page sets out what petrol actually 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.
Petrol in a diesel: what does it do to the engine?
Passing through an engine, diesel does two jobs at once. Before it combusts, it lubricates — then it burns. What stops the surfaces inside the high-pressure pump and the injectors from grinding against each other is the diesel flowing through them — they're made to extremely fine tolerances.
Of those two jobs, petrol handles the first badly and the second never. It is runnier than diesel and strips away the protection the fuel system hinges on, and so a pump running on a petrol mixture is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the rattling comes from.
Combined, those make the shape of the trouble clear. The harm is done by movement, not by contact. Where the petrol is only inside the tank, it's a fault of fuel, nothing more. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the fuel injectors further on.
Four situations our technicians see around Camp Field: how bad is petrol in a diesel?
Filled but not once started — as good as it gets. The petrol is inside the tank and only that tank, and the task is a drain and a flush where the car sits. This is the one scenario that can only really occur on a forecourt, since anywhere else the car has been driven to get there.
A moment's running, or merely your ignition on. The system has been bled, so petrol has left that tank and reached the fuel filter and your lines. Normally nothing more than draining, flushing and sorting the fuel filter, so still straightforward.
Those few miles driven were your pump working on fuel thinned by petrol throughout. How hard the vehicle was driven matters as much as how far, and the work takes in that tank, your lines, the filter and clean fuel through the entire system. On the school run to Lane End Primary School, the miles is short. Very different once more: a run to Leeds, under a mile away, or any miles on the M621, under a mile from Camp Field, where your engine never stopped running hard.
Driven till it complained. Rattling, a ragged idle, smoke, a throttle that has gone soft. What you are hearing is the motor signalling fuel that no longer behaves like diesel. Whether it's the verge on Water Lane, a lay-by or a side road, stop where you are and leave it. The drain and flush still come first, and they deal with it: if a vehicle is stopped quickly, permanent damage is very rare.
Myths Camp Field motorists hear about petrol in a diesel
"Top it up the rest of the way with diesel and it will be fine" — a myth. It will not. Topping up removes nothing; it gives you a fuller tank of the same mixture. A diesel fuel system does not accept petrol by percentage in the way that advice assumes.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." At higher pressure, through finer parts: that is how a modern diesel handles its fuel, and so the protection matters for more, not less.
The myth that catches drivers off guard: if it starts and drives, it must be unharmed. Diesel in a petrol motor generally means a motor that will not run: the driver stops, and so does the harm. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile your pump wears. Running is not 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 different issue. What petrol has diluted remains thinned, and the petrol stays inside your tank anyway.
"Drain it yourself and you are sorted" — a myth, because after it's been running some petrol sits in the fuel filter and lines, waiting to go right back through the pump on your next start. Clearing petrol into a can at the roadside is also genuinely hazardous.
Petrol in a diesel: how does it occur?
On purpose? Never. Through carelessness? Rarely, if ever. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol motor at all. The forecourt makes it easy, and the slip runs one way.
The moment routine stops matching the car is the moment it occurs. A vehicle that is new to you — hired, on loan as a courtesy car, or brand new. Two vehicles on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A hurried fill on the way to Leeds with a train to catch. A new-to-you diesel Renault Megane, its first fuelling, and a motorist accustomed to petrol: exactly when it takes place. The hand does what it has always done when you add rain, a phone call or a back seat full of kids.
Camp Field 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 usually do. Read the petrol pump's label; the colour is just a hint.
- The first fill in an unfamiliar vehicle is the time to check your filler flap — on it, or on the cap, many cars state the fuel to use.
- Good intentions count for less than a sticker or a fob in a vivid colour on your diesel's key when a house has one of each. So label it.
- "Diesel", aloud, before you lift the nozzle — every time a new or hired car needs its first tank. It seems daft. It works.
- While you're thinking about something else, this is an easy mistake to make — so tuck the phone away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to refuse a petrol nozzle, and add-on devices exist for cars without one. They are a backstop, not a reason to stop reading the petrol pump.
- Noticing it halfway? Stop at once. A thinner blend follows from less petrol in your tank, yet your next stage remains the same: do not crank it.
Put petrol in a diesel in Camp Field already?
Short and simple, then, is the order of things. Do not crank it, and do not switch your ignition on. If you're still on the forecourt — JET or anywhere else — ask the attendants to help you roll the car clear of the pump. Next, 0333 366 0103. We will ask what was put in, roughly how much, and if it has been run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a different problem — Camp Field has a page all for it.
What makes one Camp Field petrol in a diesel task cost more than the next
An honest single quote doesn't exist here: four situations, four separate jobs. The situation itself does most of the work of moving your cost. Where the vehicle is counts too, and whether a technician can safely get to it, after the share of petrol to what that tank takes.
Three queries come first, before any quote, rather than after — what went in, how much, has it run — and that is the reason. A range turns into a straight figure when those replies are in.
About Camp Field, briefly
Camp Field is a suburban area located on the riverside in West Yorkshire, sitting at an elevation of 30 metres and close to the city centre of Leeds. Camp Field is characterized by its predominant housing type, which is flat, and is situated near other notable places such as Granary Wharf and Holbeck. Camp Field has a population of approximately 4505 residents and is a short distance from the city of Leeds, being only 0.6 miles away. Camp Field is also relatively distant from London, at around 168.7 miles away.
Across West Yorkshire and around Camp Field: fuel drain cover
Petrol in diesel call-outs around Camp Field — part of the LS postcode area — go to teams that likewise cover the locations about it, Granary Wharf, Holbeck and Leeds included. A forecourt, a supermarket car park, a lay-by or your own drive are all places our technicians work, and your vehicle does not need to come to us.
In Camp Field and still at the pump?
Nothing beats it: that is where you are. Keep it off. Call.