Should You Worry? Petrol in a Diesel Car in Walmer
Provided it hasn't been started, worry far less than you likely are. "Have I wrecked it?" is the first thing everyone in Walmer asks, and the truthful answer is usually no, because petrol left in a diesel tank harms nothing until it is drawn through the fuel system — by ignition priming, by your starter, or by being driven. Petrol in Diesel is who to phone, with the engine kept off, so it stays that way. Below, you will find what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you again.
Petrol in a diesel: what does it do to the motor?
Two tasks fall to diesel on its journey through a motor. Before it combusts, it lubricates — and then it ignites. Very fine clearances are built into your injectors and the high-pressure fuel pump, and only the diesel running through keeps their surfaces from grinding together.
Badly at the first, not at all at the second: that is petrol. The knocking comes from petrol being designed not to ignite when compressed, which is precisely the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips away the lubrication the fuel system hinges on, and any pump working on that blend is wearing itself.
Combined, those leave the shape of the problem clear. The harm is done by circulation, not by contact. A tank with petrol in it is a fuel problem. Once the pump has been working on that petrol, a mechanical fault has begun: whatever is shed by a pump that is grinding is carried downstream to the fuel injectors with the fuel.
Four situations we see in Walmer: how bad is petrol in a diesel?
Fuelled up, not once started. The best case there can be. The petrol is inside the tank and just the tank, and the job is a drain and a flush where the car sits. This is the one scenario that can only truly occur at a forecourt, since anywhere else your car has been driven to get there.
A moment's running, or just your ignition on. Once primed, the fuel system has drawn petrol out of your tank as far as the fuel filter and the fuel lines. That is normally still an easy job — a drain, a flush, and the fuel filter seen to.
Those few miles driven were the pump working on fuel diluted by petrol the whole way. Miles is only half of it; how hard it was driven counts equally. Either way the work includes the tank, the fuel lines, the fuel filter and fresh fuel through the whole circuit. A school run to The Downs Church of England Primary School is one thing. Very different a second time: a trip to Canterbury, under 15 miles away, or some mileage on the M20, under 15 miles from Walmer, where the engine kept working hard.
Clattering, a ragged idle, smoke, a throttle gone soft: driven until it complained. The motor is telling you the fuel is no longer behaving like diesel. Whether it is the verge on Salisbury Road, a lay-by or a side road, stop where you are and leave it. A car pulled over soon very rarely has long-term damage, because the fuel drain and the flush, which still go first, take care of it.
Myths Walmer people hear about petrol in a diesel
False: topping up to full with diesel makes it fine. It does not. Nothing is removed when you top up — your tank just carries more of the same mixture. Percentage isn't how a diesel fuel system tolerates petrol, whatever that advice assumes.
"Newer diesels can handle a little petrol" — a myth, and closer to the reverse. Smaller components and higher pressure are the way a modern diesel runs its fuel, and that makes the lubrication matter more, not less.
This is the one that fools motorists. Myth: "If it starts and drives, there's no harm done." Feed diesel to a petrol engine and it normally won't run, so the driver stops — and the harm stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile your pump grinds. Running isn't the same as fine.
An outdated fix for a separate issue is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." What petrol has diluted remains thinned, and that petrol stays in that tank regardless.
The next start sends petrol back round your pump out of the fuel lines and the filter, where some of it ends up after the motor has been run. That is why a DIY tank drain does not leave you sorted — a myth. Besides, petrol drained into a can by the road is truly risky.
How petrol ends up: petrol in a diesel
A careless moment is seldom the cause, and no one means to do it. One way only, since of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly won't fit a petrol vehicle. That's how the forecourt makes it easy.
Routine and your car falling out of step is how it happens. Any vehicle that's new to you — hired, on loan as a courtesy car, or just bought. Households running one of each, petrol and diesel. Your normal forecourt, its pumps now in a different order. Filling up in a rush en route to the nearest station, with a train to catch. A new-to-you diesel Volkswagen Passat, its first fuelling, and a driver accustomed to petrol: exactly when it occurs. Throw in a back seat full of children, a phone call or rain, and habit takes over.
Avoiding petrol in a diesel next time you fill up around Walmer
- The label is what matters, so read the petrol pump instead of the colour: in the UK unleaded handles are usually green and diesel black, but not on each forecourt.
- The first fill in a new car is the time to check the filler flap — inside it, or on the cap, plenty of vehicles state the fuel to use.
- Mark your key. In a home with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- Before the nozzle leaves the pump the first time you fill a hired or new motor, say "diesel" out loud. Daft, perhaps, but it does the trick.
- Mistakes like this are straightforward to make whilst your mind is on something else, and so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to reject a petrol nozzle, and aftermarket devices are available for the remainder. Treat it as a backstop, and keep checking the pump.
- Noticing it mid-fill? Stop at once. A weaker blend results from less petrol inside that tank, yet the next step stays the same: do not start the car.
Put petrol in a diesel in Walmer already?
Then, there's only a short order of things. Starting it is out, and so is turning on your ignition. If you are still on the forecourt — Esso or anywhere else — ask the attendants to help you roll the car away from the pump. Next, 0333 366 0103. We'll ask what got in, roughly how much, and if it has been run.
If it was AdBlue and not petrol, say so. That's a separate fault — corrosion and deposits instead of lost protection — and it has its own page for Walmer.
Why one petrol in a diesel job around Walmer costs more than another
Four different jobs lie behind the four situations above — which is why there is no honest single quote. What shifts your cost is chiefly which of them you are in. The share matters next, meaning how much of the tank is petrol, followed by the location of the car and whether getting to it is safe for a van.
Before any quote, not after, come three queries: your fuel that went in, the quantity, and whether it's run. That's why. A range becomes a straight figure when those answers are in.
About Walmer
Walmer is a coastal suburban area in Kent, situated near the town of Deal and close to the city of Canterbury. Walmer has a population of around 5021 people and is characterised by its semi-detached housing stock. Walmer sits at a low elevation of approximately 9 metres above sea level, looking out over the English Channel. Walmer is part of a larger area that includes Upper Walmer, Lower Walmer, and Mill Hill.
Walmer and Kent: where our fuel drain cover runs
Walmer rests in the CT postcode area, and the vans that answer petrol in diesel calls there work the spots near it as well — Upper Walmer, Lower Walmer and Mill Hill among them. The car doesn't need to move to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the pump in Walmer?
Then you are in the best spot there is. Keep the vehicle turned off, and ring.