Petrol in a Diesel Car in Lochend: How Worried Should You Be?
If it has not been started, you can worry far less than you likely are. Everyone in Lochend starts with "have I ruined it?", and the fair answer is generally no: petrol resting inside the tank of any diesel remains harmless until priming, cranking or driving pulls it into the system. To keep the car that way, ring Petrol in Diesel and leave the engine alone. What petrol actually does to a diesel, how to gauge how far it has gone, and how to keep it from happening a second time: that is the rest of this page.
What petrol in a diesel does to the motor
Two jobs fall to diesel on its journey round a motor. It protects to begin with, and only then does it burn. What stops the surfaces inside the high-pressure pump and the injectors from wearing against one another is the diesel passing through them — they are built to extremely fine tolerances.
Petrol does the first task poorly and the second not at all. A pump running on a petrol blend is wearing itself out, since petrol is runnier than diesel and strips out the protection your fuel system depends on. Petrol is also made to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that is where any knocking starts.
Seen together, they make clear what shape the issue takes. It is movement that does the damage, not contact. All a tank with petrol in it amounts to is a fuel problem. The start of a mechanical one is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with the fuel to your injectors downstream.
Lochend, petrol in a diesel: four situations, from mild to significant
Fuelled up, not once started. The best case there is. Just the tank has petrol in it, and so the job is clearing your tank and purging the fuel system where your car stands. This situation can only really happen at a forecourt: anywhere else, the car got there by being driven.
A moment's running, or merely the ignition on. Petrol has come out of that tank and reached the filter and the fuel lines, since the system has been primed. Still usually simple: drain, flush, and the filter sorted.
Your pump now worked a couple of miles on weakened fuel — that is what driving it does. The work is your tank, the fuel lines, the fuel filter and clean fuel through the entire circuit, and how hard the vehicle was driven matters as much as how far. The school run to the local primary school is one matter. Very different once more: a trip to Edinburgh, under 3 miles away, or any distance on the M8, under 10 miles from Lochend, where the engine kept labouring hard.
Driven till it complained. Rattling, a ragged idle, smoke, a throttle that has gone soft. The motor is telling you the fuel is no longer acting like diesel. Leave it wherever it has stopped: a lay-by, a side street, the verge on Lochend Road South. A vehicle pulled over soon very rarely has permanent damage, since the drain and the flush, which still come first, deal with it.
Lochend drivers and the petrol in a diesel myths they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Topping up takes out nothing; it gives you a bigger tank of the same mixture. That advice assumes a diesel fuel system tolerates petrol by percentage. It doesn't.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. At higher pressure, through finer components: that's how a newer diesel moves its fuel, and so the protection matters for more, not less.
Myth: "If it starts and drives, there's no harm done." This is the one that fools motorists. The motorist of a petrol engine fed diesel normally stops, since it will not run, and the harm stops with them. A diesel fed petrol generally starts, idles and drives away as if nothing has happened, while the pump grinds. A running engine doesn't mean fine.
Myth: a two-stroke additive makes it safe to drive home. It was an old workaround, meant for another issue. It does not put back what petrol has weakened, and that petrol is still inside that tank after that.
The next start draws petrol back round the pump out of your lines and the filter, where some of it ends up once the motor has run. That's why a DIY tank drain doesn't sort it — a myth. Emptying petrol into a can at the kerbside is also really dangerous.
Petrol in a diesel: how does it occur?
It's rarely carelessness, and nobody does it on purpose. The petrol nozzle is the smaller of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol motor at all. The forecourt makes it easy, and the mistake runs one way.
Habit and the vehicle falling out of step is when it happens. Hire cars, courtesy cars, and cars that are new to you. Households running one of each, petrol and diesel. Your ordinary forecourt, its pumps suddenly in a different order. A rushed fill en route to Edinburgh Waverley with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: precisely when it happens. Throw in a back seat full of children, a phone call or rain, and habit wins.
Lochend drivers: how to avoid petrol in a diesel next time
- A green handle for unleaded and black for diesel is usual in the UK — yet not on each forecourt. Trust the label on the pump, not the colour.
- In a vehicle you don't know, look inside the flap over your filler or at the cap before the first fill: plenty of vehicles state the fuel there.
- 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 the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It sounds daft and it works.
- Tuck your phone away. This is an easy mistake to make whilst you're thinking about something else.
- Some diesels have a filler designed to reject a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the pump.
- Less petrol means a weaker mixture, so stop the moment you realise — while remembering that your next stage is unchanged. It is still not to crank it.
Lochend: already put petrol in a diesel?
In that case, there's just a short order of things. Leave it unstarted, with the ignition switched off as well. The staff on the forecourt — whether at JET itself or wherever you filled up — will usually help push it away from the pump if you ask. Call 0333 366 0103 next, with three facts — your fuel, the approximate amount, and whether it has run.
Corrosion and deposits form the trouble with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and see its own Lochend page.
Why one petrol in a diesel task around Lochend costs more than another
An honest single quote doesn't exist here: four scenarios, four separate jobs. Which of them you're in is chiefly what moves your cost. Two things come after that: the petrol that went in as a share of what the tank holds, then the place the car is in and whether a van can reach it safely.
What was put in, how much, and whether it has run — three queries our technicians ask before quoting, not after, for exactly that reason. Those replies are what turn a range into one firm number.
About Lochend, for a moment
Lochend is a coastal suburban area in the City of Edinburgh, situated approximately 1.3 miles from Edinburgh city centre. Lochend sits at an elevation of 31 metres, with its residential landscape dominated by flat-type housing. Lochend is close to several nearby streets, including Thornville Terrace, Woodbine Terrace, and Woodville Terrace, and is home to a population of around 13288 people.
Fuel drain cover across City of Edinburgh, Lochend included
Lochend waits in the EH postcode area, and our vans that answer petrol in diesel jobs there work the locations near it as well — Thornville Terrace, Woodbine Terrace and Woodville Terrace among them. You need not move the car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations we drain.
Lochend: still at the petrol pump?
Then, you couldn't be in a better spot. Keep it off. Call.