How Worried Should You Be? Petrol in a Diesel Car in Broughty Ferry
Not started? Then less worried than you likely are. Everyone around Broughty Ferry begins with "have I wrecked it?", and the fair answer is normally no: petrol left inside the tank of any diesel stays harmless till priming, cranking or driving draws it into your fuel system. Petrol in Diesel is who to call, with the engine kept off, so it remains that way. Below, this page sets out what petrol actually does inside a diesel, how far it might have got, and how to stop it happening to you again.
Petrol in a diesel: what does it do to your engine?
Passing through an engine, diesel does two jobs at the same time. It protects first, and after that does it burn. What stops the surfaces inside the high-pressure fuel pump and the injectors from wearing down against each other is your diesel flowing through them — they're built to very fine clearances.
Badly at the first, not at all at the second: that's petrol. The rattling comes from petrol being made not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection the fuel system rests on, and any pump working on that blend is wearing itself.
Put these together and the shape of the issue is clear. The harm is done by circulation, not by contact. All a tank with petrol in it amounts to is a fuel problem. Whatever a worn pump sheds goes on, borne by your fuel, into your injectors downstream, which is why a pump that has worked on that petrol is where a mechanical fault starts.
How serious is petrol in a diesel? Four situations our engineers see in Broughty Ferry
Fuelled, and never started: no case is better. On a forecourt, and genuinely only there, that petrol is still confined to the tank — because anywhere else the car was driven to reach it. The task is draining and flushing on the spot.
A brief spell of running, or merely your ignition on. With the fuel system primed, the fuel lines and filter now hold petrol that has come from that tank. That's normally still a straightforward job — a drain, a flush, and the filter dealt with.
Driven a few miles. Now the pump has spent those miles labouring on weakened fuel. How hard the vehicle was driven matters as much as how far, and this work covers your tank, the lines, the filter and fresh fuel through the entire circuit. Short trips, like the school run to the local primary school, are one thing. Driving as far as Dundee, under 5 miles away, makes a very different job — as does any mileage on the M90, under 25 miles from Broughty Ferry, with your engine running hard the whole time.
Driven on till it protested — clattering, smoke, a lumpy idle, a soft throttle. The fuel is not behaving like diesel any more, and the engine is saying so. Leave it where it stops: a lay-by, a side street, the verge on Fort Street. What goes first is still the fuel drain and flush, and that sorts it out, with long-term damage very unusual if a vehicle is stopped soon.
Petrol in a diesel myths Broughty Ferry drivers hear
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. A bigger tank of the same mixture is all you get, since topping up takes out nothing. The idea behind the guidance — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through more precise components: that is how a newer diesel moves its fuel, and so the protection matters for more, not less.
"It starts, it drives, and so there is no harm" — the myth that catches most motorists than any other. Any petrol engine fed diesel normally won't run, so the motorist stops and the harm stops with them. A diesel fed petrol normally starts, ticks over and drives away as if nothing has happened, whilst the pump wears. Running doesn't mean fine.
Myth: "Add some two-stroke oil and drive it home." It's an outdated fix for a separate issue. It doesn't put back what petrol has weakened, and the petrol is still inside your tank afterwards.
Myth: "Drain that tank yourself and you're sorted." After the motor has run, some of that petrol is no longer inside your tank: it is in the filter and the fuel lines, and it goes straight back through your pump on your next start. And, a can of petrol drained at the roadside is truly risky.
How does petrol in a diesel take place?
No one does it on purpose, and it is seldom carelessness. A diesel nozzle mostly will not go into a petrol motor, but the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake simple, and only in that direction.
The moment routine stops matching the car is the moment it takes place. Any motor that is new to you — hired, on loan as a courtesy car, or brand new. Two motors on one drive, one petrol, one diesel. Your normal forecourt, its pumps suddenly in a different order. A train to catch, and a rushed fill en route to the nearest station. Years of petrol vehicles behind you, a diesel Volkswagen Passat in front of you on the forecourt for its first tank — that is when. With rain, a call coming in, or children to deal with, your hand just does what it has always done.
How to prevent petrol in a diesel at your next fill-up in Broughty Ferry
- Read 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.
- Many vehicles state the fuel inside your filler flap or on the cap, so check there on the first fill in any 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 house with one of each.
- "Diesel", aloud, before you lift the nozzle — each time a new or hired car needs its first tank. It seems silly. It does the trick.
- Put your phone away. This is an easy mistake to make whilst you are thinking about something else.
- Add-on devices are available for vehicles without one, and some diesels come with a filler that will not take a petrol nozzle. Helpful — but a safety net at best, never a reason to stop checking the label.
- Less petrol makes a thinner blend, and so stop the moment you notice — though remembering that the next stage is unchanged. It is still not to crank it.
Petrol already in a diesel around Broughty Ferry? Begin here
Short and simple, then, is the order of things. Do not crank it, and don't switch the ignition on. If you're still on the forecourt — Sainsbury's or anywhere else — ask the staff to help you roll the vehicle clear of the pump. What got in, roughly how much, and if it has run: tell us that when you ring 0333 366 0103.
If it was AdBlue and not petrol, say so. That's a separate fault — corrosion and deposits rather than lost protection — and it has its own page for Broughty Ferry.
One petrol in a diesel task in Broughty Ferry costs more than another. Why?
Four different tasks lie behind the four situations above — which is why there's no honest single quote. Mostly, the cost moves with which situation you're in. Where your car is counts too, and whether our van can safely reach it, after the ratio of petrol to what that tank holds.
Three queries come first, before quoting, instead of after — what went in, how much, has it run — and that is the reason. The answers turn a range into a straight figure.
About Broughty Ferry and where it is
Broughty Ferry is a coastal town located near Dundee in Scotland, positioned on the north shore of the Firth of Tay. It has a distinct history, having once been a separate entity before becoming part of the city. Broughty Ferry sits in a scenic area, with its proximity to the water making it a notable spot. The town's setting and past as a separate burgh contribute to its unique character.
Broughty Ferry and Dundee City: where our fuel drain cover runs
Broughty Ferry waits in the DD postcode area, and the teams that answer petrol in diesel jobs there work the locations near it as well — West Ferry, Barnhill and Douglas and Angus among them. The car does not need to come to us: we drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
Broughty Ferry: still at the pump?
The best place there is, then — that is where you are. Leave the car switched off, then ring.