Should You Worry? Petrol in a Diesel Car in Lanark
Less than you probably are, provided it has not been started. Petrol sitting in a diesel tank does nothing to the motor until something pulls it through the fuel system — the ignition priming the pump, your starter, or the drive on its own. So the truthful answer to the first query anyone in Lanark asks, "have I ruined it?", is usually no. To keep it like that, phone Petrol in Diesel then leave your engine alone. The rest of this page explains what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you again.
What petrol in a diesel does to the motor
On its way through a motor, diesel does two tasks. Before it ignites, it lubricates — and then it combusts. Designed to extremely fine gaps, the injectors and the pump rely on the diesel moving through them to stop their surfaces wearing against one another.
Petrol does the first job poorly and the second not at all. A pump running on a petrol blend is wearing itself out, since petrol is thinner than diesel and takes away the lubrication your fuel system relies on. Petrol is also made to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that's where the rattling starts.
Seen together, they show what shape the issue takes. It's circulation that causes the harm, not contact. All a tank with petrol in it amounts to is a fuel fault. The start of a mechanical one is a pump that has been running on that petrol — and whatever a worn pump sheds travels on with the fuel to the fuel injectors downstream.
Petrol in a diesel in Lanark: how bad is it? Four situations
Filled up, and never started: no case is better. That petrol is inside your tank and only that tank, and the job is a drain and a flush where the car stands. This is the one scenario that can only really take place at a forecourt, since anywhere else your car has been driven to get there.
A brief spell of running, or merely the ignition on. With your system primed, the fuel lines and filter now contain petrol that has come from that tank. Still normally straightforward: drain, flush, and the fuel filter seen to.
A few miles driven, and your pump has spent each of them working on weakened fuel. The work is your tank, the lines, the filter and clean fuel through the whole system, and how hard the vehicle was driven counts as much as how far. The school run to the local primary school is one thing. A run as far as Glasgow, under 25 miles away, is a very different task. So is any miles on the M74, under 5 miles from Lanark, where your engine has been running hard the whole time.
It complained, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone uneven. The engine is telling you your fuel is no longer behaving like diesel. Pull up wherever you are — the verge on Bannatyne Street, a lay-by, a side street — then leave the car where it is. Permanent damage is very uncommon when a vehicle is pulled over early, and the fuel drain and flush that still go first sort it out.
Petrol in a diesel myths Lanark people hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up removes nothing; it gives you a bigger tank of the same mixture. Percentage is not how a diesel fuel system copes with petrol, whatever that guidance supposes.
"Current diesels can handle a little petrol" — a myth, and nearer the reverse. At higher pressure, through more precise parts: that is how a current diesel moves its fuel, so the protection counts for more, not less.
The myth that catches people off guard: if it starts and drives, it must be unharmed. The motorist of a petrol engine fed diesel normally stops, because it will not run, and the harm stops with them. A diesel fed petrol usually starts, ticks over and drives away as though nothing has happened, whilst your pump grinds. A running engine 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. None of what petrol diluted gets put back by it — and later, that tank still holds that petrol.
The next start sends petrol back round your pump out of your lines and your filter, where some of that ends up after your engine has been run. That's why draining your tank yourself doesn't sort it — a myth. Emptying petrol into a can by the roadside is also genuinely risky.
Why petrol in a diesel takes place so easily
It's seldom carelessness, and no one does it on purpose. A diesel nozzle generally will not fit a petrol motor, but the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error simple, and just in one direction.
It takes place when routine and your car stop matching. Courtesy car, hire car, or a car that's brand new. Households running one of each, petrol and diesel. Your usual forecourt, its pumps suddenly in a different order. Racing for a train outside the nearest station and filling up en route. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver used to petrol: exactly when it occurs. Throw in rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
Lanark people: how to prevent petrol in a diesel next time
- Green for unleaded and black for diesel is normal in the UK — yet not on every forecourt. Trust the label on the petrol pump, not the colour.
- Check your filler flap. Plenty of motors state the fuel type inside the flap or on the cap. Look at it on your first fill in a vehicle you do not know.
- One of each in the home? Mark your key to the diesel — a coloured fob, a sticker — since intending to remember is not enough.
- It sounds daft and it works: on the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump.
- 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 come with a filler built to block a petrol nozzle, and add-on devices are available for the rest. Count it as a safety net, then keep checking the pump.
- Stop as soon as you realise. Less petrol inside the tank means a weaker mix. It doesn't change what to do next, which is still not to crank it.
Lanark: already put petrol in a diesel?
Then the order of things is short. Do not switch your ignition on, and don't fire it up. The attendants on the forecourt — whether at Esso itself or wherever you filled up — will normally help push it away from the pump if you ask. Call 0333 366 0103 next, with three facts — the fuel, the rough volume, and whether it has run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a different fault — Lanark has a page all for it.
Lanark petrol in a diesel tasks: why one costs more than another
There's no fair single price for this, since the four situations above are four separate jobs. Which of them you are in is mostly what moves your cost. The proportion matters next, meaning how much of the tank is petrol, followed by the location of the vehicle and whether getting to it is safe for our van.
Before any quote, not after, we ask three queries: the fuel that went in, the amount, and if it has run. That's why. The replies turn a range into a straight figure.
About Lanark and its setting
Lanark is a town in South Lanarkshire, situated inland at an elevation of 216 metres, approximately 22 miles southeast of Glasgow. Lanark lies near several smaller communities, including Kingsons Knowe, New Lanark, and Kirkfieldbank. Lanark has a population of around 9101 people, with a predominance of detached housing. Lanark is also relatively distant from London, at a distance of 324 miles.
Fuel drain cover across South Lanarkshire, Lanark included
Our teams answering petrol in diesel call-outs in Lanark, in the ML postcode area, equally work the locations near it, Kingsons Knowe, New Lanark and Kirkfieldbank among them. The vehicle 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.
In Lanark and still at the petrol pump?
Then you are in the best position there can be. Keep the vehicle switched off, and ring.