How Worried Should You Be? Petrol in a Diesel Car in Haddington
Less than you probably are, if it has not been started. Petrol sitting in a diesel tank does nothing to the motor till something pulls it through the system — the ignition priming the pump, the starter, or driving itself. So the honest answer to the first query everyone in Haddington asks, "have I wrecked it?", is generally no. To leave the car like that, phone Petrol in Diesel and leave your motor alone. Further down, you will find what petrol really does inside a diesel, how far it might have gone, and how to stop it happening to you a second time.
Petrol in a diesel: what does it do to the motor?
Two tasks fall to diesel on its route round a motor. It ignites, and before it ignites it protects. Made to extremely fine gaps, the fuel injectors and your pump rely on the diesel flowing through them to keep their surfaces from wearing against one another.
Petrol handles the first task badly and the second not at all. The rattling comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips away the lubrication your system depends on, and any pump running on such a blend is wearing itself.
Seen together, they make clear what shape the problem takes. The damage is done by movement, not by contact. Petrol in a tank is a fuel issue. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the fuel injectors downstream.
Petrol in a diesel around Haddington: how bad is it? Four cases
Filled up, not once started. The best case there is. That petrol is in that tank and only your tank, and the job is a drain and a flush where your car stands. This is the one situation that can only truly take place on a forecourt, as anywhere else the vehicle has been driven to get there.
Started for a second, or only the ignition on. Your system has been primed, and so petrol has left that tank and reached your filter and the lines. Usually little more than emptying, cleaning and seeing to the fuel filter, so still simple.
A few miles driven, and the pump has spent each of them working on thinned fuel. Tank, lines, filter, then clean fuel put through the entire circuit: that is this work, and the way the car was driven matters as much as the mileage. A school run to the local primary school is one thing. A run as far as Edinburgh, under 25 miles away, is a very different task. So is any mileage on the M8, under 25 miles from Haddington, where the engine has been running hard the whole time.
Knocking, an uneven idle, smoke, a throttle gone soft: driven until it complained. That is the engine telling you its fuel no longer is acting like diesel. Pull up wherever you are — the verge on Station Road, a lay-by, a side street — then leave the car there. The fuel drain and flush still come first, and they sort it out: when a car is pulled over quickly, permanent damage is very rare.
Myths Haddington people hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. A fuller tank of the same mix is all you get, because topping up takes out nothing. A diesel fuel system does not tolerate petrol by percentage in the way that guidance presumes.
If anything, the reverse holds. Myth: "A modern diesel can cope with a bit of petrol." Smaller components and higher pressure are the way a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that catches people. Feed diesel to a petrol motor and it usually will not run, and so the motorist stops — and the damage stops with them. Whilst the pump grinds, a diesel fed petrol normally starts, ticks over and drives away as though nothing has happened. Being able to run isn't proof of being fine.
An outdated workaround for a different problem is behind this one. Myth: "Add some two-stroke oil and drive it home." What petrol has thinned stays thinned, and that petrol remains inside that tank anyway.
Myth: "Drain your tank yourself and you are sorted." After the engine has been run, some of that petrol is no longer inside the tank: it's in your filter and the fuel lines, and it goes straight back through your pump at your next start. It's also truly hazardous to drain petrol into a can at the kerbside.
How it happens: petrol in a diesel
Carelessness is rarely the cause, and no one means to do it. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle generally won't go into a petrol motor at all. So the slip runs one way.
Routine and your car getting out of step is how it happens. Hire cars, courtesy cars, and vehicles that are new to you. One petrol and one diesel on the driveway of the same household. The pumps in a different order on a well-known forecourt. Racing for a train at Drem and fuelling up en route. A new-to-you diesel BMW 3 Series, its first fuelling, and a driver used to petrol: precisely when it occurs. With rain, a call coming in, or a car full of children to deal with, your hand simply does what it always has.
Preventing petrol in a diesel next time you fill up around Haddington
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most usually do. Check the petrol pump's label; the colour is just a hint.
- The first fill in a new car is the time to check your filler flap — on it, or on the cap, many cars state which fuel they take.
- 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 meaning to remember.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump. It sounds daft and it does the trick.
- Put the phone away. This is an easy mistake to make while you are thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to refuse a petrol nozzle, and aftermarket devices exist for the remainder. Count it as a backstop, and keep checking the petrol pump.
- Stop the moment you realise. Less petrol inside your tank means a weaker mix. It doesn't change what to do next, which is still not to fire it up.
Petrol already in a diesel around Haddington? Begin here
Short and simple, then, is the order of things. Do not start the vehicle, and do not switch the ignition on. If you are still on the forecourt — JET or anywhere else — ask the attendants to help you roll the car clear of the pump. What went in, about how much, and if it has run: tell us those when you phone 0333 366 0103.
Corrosion and deposits are the issue with AdBlue, whereas petrol means lost protection. So if it was AdBlue, say so — and see its own Haddington page.
Why one petrol in a diesel job in Haddington costs more than another
An honest single price doesn't exist here: four scenarios, four separate tasks. What moves the cost is chiefly which of them you are in. After that it is the proportion — how much petrol went in against how much your tank holds — and then where the car is and whether a technician can get to it safely.
That is why we ask three questions before pricing rather than after: what got in, how much, and whether it's run. Their replies are what change a range into one firm number.
About Haddington, briefly
Haddington is a town situated on the River Tyne in East Lothian, with a mix of semi-detached housing and other residential properties. Haddington sits at an elevation of 53 metres, near the villages of Hailes Terrace and Dovecote, and is located approximately 15 miles east of Edinburgh. Haddington has a population of around 10,700 people and is a significant urban centre in the region. Haddington's riverside setting has influenced its development over time, with the town expanding outward from the river.
Fuel drain cover in Haddington and across East Lothian
Petrol in diesel jobs in Haddington — part of the EH postcode area — go to teams that likewise cover the locations round it, Hailes Terrace, Dovecote and Nungate among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations we drain, and your car does not need to come to us.
At the petrol pump around Haddington, still?
Then you are in the best place there can be. Call, and leave it switched off.