How Worried Should You Be? Petrol in a Diesel Car in Bellyeoman
Not started? Then less worried than you probably are. Petrol sitting in a diesel tank does nothing to your motor until something pulls it through the system — your ignition priming the pump, your starter, or the drive itself. So the fair answer to the first query everyone in Bellyeoman asks, "have I wrecked it?", is generally no. Petrol in Diesel is who to phone, with your engine left off, and so it remains that way. Below, this page sets out what petrol really does inside a diesel, how far it might have gone, and how to stop it happening to you a second time.
The motor and petrol in a diesel: what happens
Diesel does two tasks on its way through an engine. It protects to begin with, and after that does it burn. Your high-pressure pump and your injectors are made to very fine gaps, and your diesel passing through them is what keeps those surfaces from grinding against each other.
The second task petrol does not do at all, and the first it does poorly. It's runnier than diesel and strips away the protection the system depends 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 reverse of what a diesel needs from its fuel. That's where the knocking comes from.
The shape of the issue is plain once you put those together. The harm is done by circulation, not by contact. Any tank with petrol in it is a fuel problem. The start of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds moves on with the fuel to the fuel injectors downstream.
Four situations we see around Bellyeoman: how bad is petrol in a diesel?
Fuelled but never started — the best it gets. At a forecourt, and truly only there, that petrol is still confined to that tank — since everywhere else your car was driven to reach it. The task is emptying and purging on the spot.
Ignition on, or started for a second. Your system has been primed, so petrol has left the tank and reached your filter and the fuel lines. Drain, flush, see to the filter: still usually easy.
The pump has worked a couple of miles on thinned fuel — that's what driving it meant. Tank, lines, filter, then clean fuel run through the entire system: that is the work, and the way the vehicle was driven matters as much as the miles. Driving the kids to the local primary school is one kind of trip. Very different a second time: a trip to Dunfermline, under 3 miles away, or some miles on the M90, under 3 miles from Bellyeoman, where your engine kept running hard.
Driven till it protested. Rattling, a ragged idle, smoke, a throttle that has gone soft. That is the motor telling you its fuel no longer is behaving like diesel. Pull up wherever you are — the verge on Balfour Court, a lay-by, a side street — and leave the vehicle where it is. Long-term damage is very uncommon when a vehicle is stopped quickly, and the drain and flush-through that still come first sort it out.
Petrol in a diesel stories Bellyeoman motorists hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Nothing is removed when you top up — that tank just holds more of the same blend. 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 opposite. At higher pressure, through finer parts: that's how a newer diesel handles its fuel, and so the lubrication matters more, not less.
"It starts, it drives, so no harm done" — the myth that catches most people than any other. Any petrol motor fed diesel normally won't run, so the motorist stops and the harm stops with them. Feed petrol to a diesel and it usually fires up, idles and pulls away like nothing happened — all the while its pump wears. Fine and running aren't the same thing.
An old fix for a separate fault lies behind this one. Myth: "Add some two-stroke oil and drive it home." It doesn't put back what petrol has thinned, and that petrol is still in the tank afterwards.
If the engine has been run, part of the petrol is in the fuel filter and the lines, not the tank — and the next start sends it right back through your pump. So the myth "drain that tank yourself and you are sorted" does not stand up. Clearing petrol into a can at the roadside is also genuinely hazardous.
How it happens: petrol in a diesel
No one does it on purpose, and it's rarely carelessness. The petrol nozzle is the smaller of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol car at all. The forecourt makes it simple, and the slip runs one way.
Routine and the car falling out of step is how it happens. 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 well-known forecourt. Filling up in a hurry on the way to Dunfermline Queen Margaret, with a train to catch. A new-to-you diesel Renault Megane, its first fuelling, and a driver accustomed to petrol: exactly when it happens. Add rain, a phone call or a back seat full of children, and the hand does what it has always done.
Next time you fill up in Bellyeoman: avoiding petrol in a diesel
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most generally do. Check the pump's label; the colour is just a clue.
- Check the filler flap. Many motors state the fuel inside the flap or on the cap. Look at it on your first fill in a vehicle you do not know.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of intending to remember, in a home with one of each.
- Before the nozzle comes off the pump the first time you fuel a hired or new car, say "diesel" out loud. Silly, perhaps, yet it does the trick.
- While you are thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Add-on devices exist for vehicles without one, and some diesels are built with a filler that will not take a petrol nozzle. Useful — but a backstop only, never a reason to stop checking the label.
- Less petrol makes a weaker blend, and so stop as soon as you notice — while remembering that your next stage is unchanged. It is still not to crank it.
Petrol already in a diesel around Bellyeoman? Start here
Short and simple, then, is the order of things. Do not start the car, and do not switch your ignition on. Yet on the forecourt, at Shell or anywhere else? Ask the staff to help you push the car away from the petrol pump. Next, 0333 366 0103. We will ask what went in, about how much, and if it has been run.
Say so if it was AdBlue rather than petrol: it is a different fault, with its own page for Bellyeoman, since AdBlue brings corrosion and deposits rather than lost protection.
Why one petrol in a diesel job around Bellyeoman costs more than another
Four separate tasks sit behind the four situations above — which is why there is no honest single quote. The scenario itself does most of the work of moving your cost. The ratio counts next, meaning how much of the tank is petrol, followed by the position of the vehicle and whether getting to it is safe for a technician.
Three questions come first, before any quote, rather than after — what got in, how much, has it run — and this is the reason. A range turns into a straight figure when those replies are in.
About Bellyeoman itself
Bellyeoman is a suburban area situated near Dunfermline in Fife, with Bellyeoman being part of the wider urban landscape of the region. Bellyeoman sits at an elevation of 108 metres, characterised by its predominantly semi-detached housing stock. Bellyeoman is located close to other nearby places such as Kingseathill, Headwell, and Townhill, with Bellyeoman itself being home to a population of around 4899 people.
Bellyeoman and Fife: where our fuel drain cover reaches
Kingseathill, Headwell and Townhill are among the locations near Bellyeoman that the same vans work, answering petrol in diesel call-outs across Bellyeoman's KY postcode area. You need not bring your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots where we work.
In Bellyeoman and still at the petrol pump?
Then you are in the best spot there can be. Turned off it remains; then phone.