Should You Worry? Petrol in a Diesel Car in Victoria Park Mews
Unstarted? Then less anxious than you probably feel. "Have I ruined it?" is the first thing everyone in Victoria Park Mews asks, and the honest answer is usually no, because petrol resting in a diesel tank harms nothing until it's drawn through your fuel system — by ignition priming, by the starter, or by driving. Keep it like that: leave the engine off and ring Petrol in Diesel. 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.
What petrol in a diesel does to the engine
On its way through a motor, diesel has two tasks. It protects to begin with, and only then does it burn. Very fine tolerances go into your injectors and the high-pressure fuel pump, and only your diesel running through keeps those surfaces from grinding together.
The second task petrol does not do at all, and the first it does badly. It's thinner than diesel and removes the lubrication your fuel system rests on, so a pump running on a petrol mix is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the rattling comes from.
Put these together and the shape of the issue is plain. The damage is done by movement, not by contact. Petrol in a tank is a fuel fault. Whatever a worn pump sheds travels on, carried by the fuel, into your injectors downstream, which is why a pump that has been working on the petrol is where a mechanical problem starts.
Four situations our technicians see in Victoria Park Mews: how bad is petrol in a diesel?
The best case there can be: filled up, never started. On a forecourt, and truly only there, the petrol is still confined to your tank — because everywhere else the car was driven to get to it. The task is emptying and rinsing on the spot.
Started for a moment, or just the ignition on. Petrol has left your tank and reached the fuel filter and your lines, since your system has been primed. Drain, flush, see to your filter: still usually simple.
Your pump now worked a few miles on weakened fuel — that is what driving the vehicle does. Tank, lines, filter, then clean fuel run through the entire circuit: that's the work, and the way the car was driven counts as much as the mileage. Short trips, like the school run to Dover, St Mary's Church of England Primary School, are one thing. A run as far as Canterbury, under 15 miles away, is a very different job. So is any miles on the M20, under 10 miles from Victoria Park Mews, where the motor has been labouring hard the whole time.
Driven on until it protested — clattering, smoke, a ragged idle, a dead throttle. The engine is telling you the fuel is no longer acting like diesel. Whether it is the verge on Castle Hill Road, a lay-by or a side road, stop where you are and leave it. A vehicle stopped early very seldom has permanent damage, since the drain and the flush-through, which still go first, deal with it.
Myths Victoria Park Mews drivers hear about petrol in a diesel
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 mixture. A diesel fuel system does not tolerate petrol by percentage in the way that advice presumes.
"Newer diesels can handle a little petrol" — a myth, and nearer the reverse. Protection matters more on newer diesels, not less, since their fuel runs through finer components at higher pressure.
Myth: "If it starts and drives, there's no damage done." This is the one that catches motorists. Diesel in a petrol motor generally leaves a motor that won't run: the motorist stops, and so does the harm. Whilst the pump wears, a diesel fed petrol usually starts, idles and drives away as if nothing has happened. Running does not mean fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a separate issue. The petrol is still in the tank after that, and what it has thinned isn't put back.
The next start sends petrol back round the pump out of the lines and your filter, where some of it ends up once the motor has been run. That's why draining your tank yourself does not sort it — a myth. And, a can of petrol drained by the roadside is genuinely hazardous.
Why petrol in a diesel occurs at all
Carelessness is seldom the cause, and no one means to do it. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol car at all. The forecourt makes it simple, and the slip runs one way.
Habit and the car getting out of step is how it happens. Hire cars, courtesy cars, and cars that are new to you. Two motors on one drive, one petrol, one diesel. Your ordinary forecourt, its pumps suddenly in a different order. A train to catch, and a hurried fill on the way to Dover Priory. Exactly the moment it takes place: after years of driving petrol, a driver fills a diesel Volkswagen Passat for the first time. Add rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
Next time you fill up in Victoria Park Mews: avoiding petrol in a diesel
- The label is what counts, and so check the pump rather than the colour: in the UK unleaded handles are usually green and diesel black, yet not on every forecourt.
- Plenty of cars state the fuel type inside the filler flap or on the cap, so check there on your first fill in any vehicle you do not know.
- Good intentions do less than a sticker or a fob in a vivid colour on the 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 gets its first tank. It sounds daft. It works.
- Mistakes like this are simple to make whilst your mind is on something else, so your phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to refuse a petrol nozzle, and add-on devices are available for vehicles without one. They are a safety net, not a reason to stop reading the petrol pump.
- Stop as soon as you realise. Less petrol inside your tank makes a thinner blend. It doesn't change what to do next, which is still not to start it.
Put petrol in a diesel around Victoria Park Mews already?
The order of things is short, then. Starting it is out, and so is switching on your ignition. The attendants on the forecourt — whether at BP itself or wherever you filled up — will usually help roll it away from the petrol pump if you ask. Next, 0333 366 0103. We'll ask what was put in, about how much, and if it's been run.
If it was AdBlue rather than petrol, say so. That is a different problem — corrosion and deposits rather than lost lubrication — and it has its own page for Victoria Park Mews.
One petrol in a diesel task in Victoria Park Mews costs more than another. Why?
There's no fair single price for this, since the four scenarios above are four different tasks. The situation itself does most of the work of moving the cost. The ratio counts next, meaning how much of that tank is petrol, followed by the position of your car and whether reaching it is safe for our van.
Before any quote, not after, we ask three questions: the fuel that was put in, its quantity, and if it's run. That is why. A range turns into a straight figure when the answers are in.
About Victoria Park Mews, briefly
Victoria Park Mews is a coastal locality in Kent, situated near the town of Dover and the Western Heights. Victoria Park Mews has a relatively low elevation of 12 metres, and its proximity to the sea has influenced its development. Victoria Park Mews is located within commuting distance of Canterbury, which is 14.8 miles away, and is also around 67.8 miles from London.
Victoria Park Mews and Kent: where our fuel drain cover reaches
Dover, Western Heights and Clarendon are among the spots around Victoria Park Mews that the same vans work, answering petrol in diesel jobs across Victoria Park Mews's CT postcode area. The car does not need to move to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
At the petrol pump in Victoria Park Mews, still?
Nothing beats it: that is where you now are. Keep it off. Phone.