Should You Worry? Petrol in a Diesel Car in Lavister
Far less than you probably are, if it hasn't been started. Till your ignition primes your pump, your starter cranks, or your vehicle is driven, petrol in a diesel tank simply waits there and does no harm. Which means the truthful reply to that first Lavister question — "have I wrecked it?" — normally no. Keep it that way: leave the engine off and phone Petrol in Diesel. Below, you will find what petrol really does inside a diesel, how far it might have gone, and how to stop it happening to you again.
The engine and petrol in a diesel: what happens
Passing through a motor, diesel is doing two things at once. Before it burns, it protects — and then it burns. What stops the surfaces inside the high-pressure pump and your injectors from wearing down against each other is your diesel flowing through them — they're made to very fine clearances.
Of these two jobs, petrol manages the first badly and the second not at all. The clattering comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection the system hinges on, and any pump running on that blend is wearing itself.
Seen together, they make clear the shape the issue takes. Not contact but movement is what causes the harm. Petrol in a tank is a fuel problem. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with your fuel to your injectors further on.
How serious is petrol in a diesel? Four scenarios our technicians see in Lavister
Fuelled but not once started — the best it gets. Being on a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With that petrol held in the tank alone, it's emptied and flushed on the spot, and nothing more is needed.
Started for a second, or only the ignition on. With the system primed, your lines and filter already hold petrol that has come from the tank. Drain, flush, deal with your filter: still normally simple.
Your pump has worked a couple of miles on diluted fuel — that's what driving the vehicle meant. How hard the car was driven counts as much as how far, and the work takes in that tank, the fuel lines, the fuel filter and fresh fuel through the whole system. On the school run to Dodleston CofE Primary School, the distance is small. Any mileage on the M53, under 10 miles from Lavister, means the motor working hard throughout, and a run to Wrexham, under 10 miles away, is a very different job as well.
Driven on until it protested — knocking, smoke, a ragged idle, a soft throttle. That is your engine telling you its fuel no longer is acting like diesel. Whether it is the verge on Roselands Court, a lay-by or a side road, stop there and leave it. What comes first is still the drain and flush-through, and that deals with it, with lasting damage very rare when a car is pulled over quickly.
What Lavister drivers get told about petrol in a diesel — and the myths in it
False: topping up to full with diesel makes it fine. It doesn't. Topping up takes out nothing; it gives you a fuller tank of the same mixture. The idea behind that advice — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. At higher pressure, through smaller parts: that's how a current diesel handles its fuel, and so the lubrication counts for more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that fools drivers. Any petrol motor fed diesel usually will not run, and so the motorist stops and the harm stops with them. Feed petrol to a diesel and it normally starts, idles and pulls away as if nothing has happened — all the while its pump is wearing. 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 fault. That petrol is still inside the tank afterwards, and whatever it has diluted isn't put back.
Myth: "Drain your tank yourself and you are sorted." Once the engine has been run, some of the petrol is no longer inside that tank: it is in your filter and the fuel lines, and it goes straight back through your pump on the next start. On top of that, petrol emptied into a can by the road is truly dangerous.
How it happens: petrol in a diesel
Nobody does it on purpose, and it's seldom carelessness. The forecourt makes it simple: the petrol nozzle is the smaller of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle mostly will not go into a petrol vehicle at all. So the error runs one way.
When habit and the vehicle stop matching, it occurs. A new car, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. Your normal forecourt, its pumps suddenly in a different order. Rushing for a train outside Caergwrle and fuelling up en route. Exactly the moment it occurs: after years of driving petrol, someone fills a diesel Volkswagen Passat for the first time. The hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
How to avoid petrol in a diesel at your next fill-up in Lavister
- Check the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on every forecourt. The label is what matters.
- The first fill in an unfamiliar car is the time to check the filler flap — inside it, or on the cap, plenty of cars state which fuel to use.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of meaning to remember, for a household with one of each.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It seems daft and it works.
- Mistakes like this are straightforward to make while your mind is on something else, and so the phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject a petrol nozzle, and add-on devices are available for motors without one. They are a backstop, not a reason to stop checking the pump.
- Spotting it halfway? Stop there and then. A weaker mixture results from less petrol in the tank, yet the next step remains the same: don't fire it up.
Put petrol in a diesel in Lavister already?
Short and simple, then, is the order of things. Do not fire it up, and don't switch your ignition on. If you're still on the forecourt — BP or anywhere else — ask the attendants to help you push it clear of the petrol pump. What was put in, roughly how much, and if it's run: tell us that when you phone 0333 366 0103.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a separate issue — Lavister has a page just for it.
One petrol in a diesel job around Lavister costs more than another. Why?
There is no fair single quote for this, because the four situations above are four separate tasks. What moves your cost is chiefly which of them you are in. Where your car is counts too, and whether our van can safely reach it, after the ratio of petrol to what your tank holds.
That is why we ask three questions before quoting instead of after: what was put in, how much, and whether it has run. Given those replies, there is a straight figure rather than a range.
About Lavister
Lavister is a small village in Wrexham, situated on the banks of a river at a low elevation of around 13 metres. Lavister lies close to the nearby cities and villages, including Wrexham, Darland, Broadoak, and Pulford, and is characterized by its predominantly detached housing. Lavister is located in a rural area, with Wrexham being the nearest city, approximately 5.3 miles away.
Fuel drain cover in Lavister and across Wrexham
Our teams answering petrol in diesel calls in Lavister, in the LL postcode area, also work the locations around it, Darland, Broadoak and Pulford among them. Our engineers drain where your vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
At the petrol pump around Lavister, still?
In that case, you couldn't be in a better spot. Keep it off. Ring.