Langley Heath: Petrol in a Diesel Car? How Worried to Be
Not started? Then less worried than you likely feel. Petrol sitting in a diesel tank does nothing to your engine until something pulls it through the system — your ignition priming your pump, your starter, or driving on its own. So the fair answer to the first question everyone in Langley Heath asks, "have I wrecked it?", is generally no. Keep it that way: leave your engine off then 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.
What petrol in a diesel does to the engine
Two jobs fall to diesel on its journey round a motor. Before it burns, it lubricates — and then it combusts. Built to very fine tolerances, your injectors and your pump rely on the diesel moving through them to keep their surfaces from wearing against one another.
Petrol handles the first job poorly and the second not at all. Being less viscous than diesel, petrol strips away the protection a fuel system needs, so a pump on the mixture wearing itself. It is also made to resist igniting under compression — the reverse of what a diesel needs — which is why you get the rattling.
Seen together, they show what shape the issue takes. Contact doesn't do the damage — movement does. All a tank with petrol in it amounts to is a fuel issue. Once the pump has been running on that petrol, a mechanical fault has started: whatever is shed by a pump that is wearing down is carried onward to your injectors with the fuel.
Petrol in a diesel around Langley Heath: how serious is it? Four cases
Fuelled, and not started: no case is better. Being at a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With the petrol held in your tank alone, it is cleared and rinsed right where it stands, and nothing more is needed.
The ignition switched on, or a brief start. Petrol has come out of the tank and got to the fuel filter and the fuel lines, since the fuel system has been primed. Drain, flush, see to your filter: still usually simple.
Those few miles driven meant your pump working on fuel weakened by petrol throughout. The work is that tank, the fuel lines, the filter and fresh fuel through the whole circuit, and how hard the vehicle was driven matters as much as how far. On the school run to Leigh Academy Langley Park, the distance is small. A run as far as Canterbury, under 25 miles away, is a very different task. So is any distance on the M20, under 3 miles from Langley Heath, where the engine has been working hard throughout.
Driven on until it complained — knocking, smoke, a ragged idle, a dead throttle. What you are hearing is your engine signalling fuel that no longer acts like diesel. Whether it is the verge on Shepherds Way, a lay-by or a side road, stop where you are then leave it. A car stopped quickly very rarely has lasting damage, since the drain and the flush-through, which still go first, sort it out.
What Langley Heath motorists get told about petrol in a diesel — and the stories in it
Myth: 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. A diesel fuel system does not tolerate petrol by percentage in the way that guidance assumes.
Myth: a modern diesel copes with a bit of petrol. If anything, the opposite. Finer parts and higher pressure are the way a newer diesel runs its fuel, and that makes the lubrication count more, not less.
One myth that catches drivers off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it usually will not run, and so the driver stops — and the damage stops with them. Feed petrol to a diesel and it normally fires up, idles and drives away like nothing has happened — all the while its pump wears. Running does not mean fine.
Myth: "Add some two-stroke oil and drive it home." It's an old fix for a separate issue. It does not put back what petrol has thinned, and that petrol is still inside the tank later.
If your engine has been run, part of that petrol sits in the fuel filter and the fuel lines, not your tank — and your next start pulls it right back through the pump. So the myth "drain your tank yourself and you are sorted" does not hold. Emptying petrol into a can by the roadside is also really risky.
How does petrol in a diesel occur?
No one does it on purpose, and it's rarely carelessness. The petrol nozzle is the smaller 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 mistake runs one way.
When habit and the vehicle stop matching, it occurs. Hire cars, courtesy cars, and vehicles that are new to you. Households running one of each, petrol and diesel. The pumps in a different order on a familiar forecourt. A train to catch, and a hurried fill en route to Hollingbourne. Exactly the moment it happens: after years of driving petrol, a driver fills a diesel Volkswagen Passat for the first time. Throw in rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
Preventing petrol in a diesel next time you fill up in Langley Heath
- The label is what counts, and so read the pump instead of 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 it on your first fill in a vehicle you do not know.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, for a home with one of each.
- "Diesel", aloud, before you lift the nozzle — each time a new or hired car gets its first tank. It seems daft. It works.
- Put the phone away. This is an easy mistake to make while you are thinking about something else.
- Some diesels come with a filler designed to block a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump.
- Stop as soon as you realise. Less petrol in your tank makes a thinner mixture. It does not change what to do next, which is still not to fire it up.
Already put petrol in a diesel around Langley Heath?
Then, there is just a short order of things. Leave it unstarted, with your ignition switched off too. If you are still at the forecourt — the nearest petrol station or anywhere else — ask the staff to help you push the vehicle clear of the pump. Next, 0333 366 0103. We'll ask what got in, about how much, and if it has been run.
Corrosion and deposits form the problem with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and see its own Langley Heath page.
Why one petrol in a diesel job in Langley Heath costs more than another
There is no honest single price for this, since the four situations above are four different tasks. Which of them you're in is chiefly what shifts your cost. Beyond that it is the share — how much petrol went in against how much your tank takes — and after that where your car is and whether a technician can reach it safely.
Ahead of any quote, not after, we ask three questions: your fuel that got in, the quantity, and if it has run. That's why. A range turns into a straight figure once those answers are in.
About Langley Heath, briefly
Langley Heath is a small village in Kent, situated near the River Medway and surrounded by countryside. Langley Heath has a population of around 599 people and is characterized by semi-detached housing. Langley Heath is located near several other small settlements, including Five Wents and Langley, and is close to the Otham Hole area. Langley Heath sits at an elevation of 98 metres, approximately 36 miles from London and 21 miles from Canterbury.
Across Kent and in Langley Heath: fuel drain cover
Petrol in diesel jobs around Langley Heath — part of the ME postcode area — go to vans that also cover the spots around it, Five Wents, Langley and Otham Hole among them. You need not bring your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations where we work.
In Langley Heath and still at the petrol pump?
Then you are in the best position there can be. Keep it off. Ring.