Stoneyburn: Petrol in a Diesel Car? How Worried to Be
Probably less than you already are — provided no one has started the vehicle. "Have I ruined it?" is the first question anyone in Stoneyburn asks, and the truthful answer is usually no, since petrol resting in a diesel tank hurts nothing till it's dragged through the fuel system — by ignition priming, by your starter, or by driving. To keep the vehicle that way, phone Petrol in Diesel and leave the motor switched off. Below, this page sets out what petrol really does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
Petrol in a diesel: what does it do to the motor?
Diesel does two jobs on its way through a motor. Oiling comes before burning; it does both. Designed to extremely fine clearances, your injectors and the pump depend on your diesel flowing through them to stop their surfaces wearing against one another.
Of these two jobs, petrol handles the first badly and the second never. It is thinner than diesel and strips away the protection the system hinges on, and so a pump running on a petrol mix is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That's where the clattering comes from.
Combined, those leave the shape of the trouble plain. Contact doesn't do the damage — circulation does. All a tank with petrol in it amounts to is a fuel problem. Whatever a worn pump sheds travels on, carried by the fuel, into the fuel injectors further along, which is why a pump that has worked on that petrol is where a mechanical issue starts.
Four scenarios we see in Stoneyburn: how serious is petrol in a diesel?
Fuelled up, not once started. The best case there is. The petrol is in that 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 truly happen at a forecourt, as anywhere else the vehicle has been driven to get there.
The ignition switched on, or a brief start. Your system has been primed, and so petrol has left the tank and reached the filter and the fuel lines. Normally little more than emptying, purging and seeing to the fuel filter, and so still straightforward.
A few miles driven, and the pump has spent each of them labouring on diluted fuel. Tank, lines, filter, then clean fuel put through the whole circuit: that's the work, and the way your car was driven matters as much as the miles. Short trips, like the school run to the local primary school, are one thing. Very different a second time: a trip to Dunfermline, under 25 miles away, or any mileage on the M8, under 3 miles from Stoneyburn, where the engine kept running hard.
It complained, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone lumpy. The engine is telling you the fuel is no longer behaving like diesel. Pull up on the spot — on the verge on Dalziel Court, at the kerb, down a side road — and don't move it. What goes first is still the fuel drain and flush, and that sorts it out, with long-term damage very uncommon if a car is stopped quickly.
Stoneyburn motorists and that petrol in a diesel stories they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Topping up removes nothing; it gives you a bigger tank of the same mix. A diesel fuel system does not accept petrol by percentage in the way that advice supposes.
Myth: a newer diesel copes with a bit of petrol. Rather, the reverse. Lubrication counts more on modern diesels, not less, because their fuel passes through more precise parts at higher pressure.
The myth that catches people off guard: if it starts and drives, it must be unharmed. Any petrol motor fed diesel normally won't run, and so the driver stops and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump grinds. Running 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 different problem. What petrol has diluted remains weakened, and that petrol stays in the tank regardless.
Once your engine has been run, part of that petrol sits in the filter and the fuel lines, not that tank — and the next start pulls it right back through the pump. So the myth "drain that tank yourself and you are sorted" does not stand up. Draining petrol into a can by the roadside is also really risky.
How does petrol in a diesel occur?
On purpose? Never. Through carelessness? Seldom, if ever. A diesel nozzle generally will not go into a petrol vehicle, but the smaller petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake simple, and just in that direction.
The moment routine stops matching your car is the moment it occurs. A new car, a hire car or a courtesy car. Households running one of each, petrol and diesel. A forecourt you know, only with its pumps laid out differently. Rushing for a train at Addiewell and filling up en route. Precisely the moment it occurs: after years of driving petrol, someone fills a diesel Renault Clio for the first time. Throw in rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
Next time you fill up around Stoneyburn: preventing petrol in a diesel
- Read the pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on each forecourt. The label is what counts.
- Many vehicles state the fuel type inside your filler flap or on the cap, and so check there on your first fill in any motor you do not know.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of meaning to remember, for a home with one of each.
- "Diesel", out loud, before you pick up the nozzle — each time a new or hired car gets its first tank. It sounds daft. It works.
- Mistakes like this are easy to make while your mind is on something else, and so your phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject a petrol nozzle, and add-on devices are available for vehicles without one. They are a backstop, not a reason to stop checking the petrol pump.
- The moment you notice, stop: less petrol in the tank makes a weaker blend. What to do next doesn't change, though — still don't crank it.
Stoneyburn: already put petrol in a diesel?
Short and simple, then, is the order of things. Never start the vehicle, and don't turn your ignition on. Ask the attendants to help you push it away from the petrol pump if you're still at the forecourt, whether that is BP or somewhere else. What got in, roughly how much, and whether it's run: tell us that when you ring 0333 366 0103.
Corrosion and deposits are the problem with AdBlue, whereas petrol brings lost lubrication. So if it was AdBlue, say so — and see its own Stoneyburn page.
What makes one Stoneyburn petrol in a diesel task cost more than the next
There is no honest single price for this, since the four situations above are four different tasks. The situation itself does most of the work of moving your cost. The share counts next, meaning how much of the tank is petrol, followed by the location of the vehicle and whether reaching it is safe for a van.
Three questions come first, before quoting, instead of after — what got in, how much, has it run — and that is the reason. Those answers are what turn a range into one firm number.
About Stoneyburn, briefly
Stoneyburn is a village in West Lothian, situated on the riverside at an elevation of 189 metres, with terraced housing being the predominant type of accommodation. Stoneyburn is located near other small settlements such as Loganlea, Bents, and Addiebrownhill, and is approximately 16.7 miles from the city of Dunfermline. Stoneyburn has a population of around 996 residents, and its setting provides scenic views of the surrounding countryside. Stoneyburn is also relatively distant from major cities, with London being around 332.3 miles away.
Fuel drain cover in Stoneyburn and across West Lothian
Petrol in diesel call-outs in Stoneyburn — part of the EH postcode area — go to vans that also cover the spots round it, Loganlea, Bents and Addiebrownhill among them. No need to move your car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all locations we drain.
In Stoneyburn and still at the pump?
Nothing beats it: that's where you now are. Keep it off. Call.