Should You Worry? Petrol in a Diesel Car in Lennoxtown
Probably less than you already are — as long as nobody has started the vehicle. Everyone around Lennoxtown starts with "have I wrecked it?", and the honest answer is usually no: petrol left in your tank of a diesel stays harmless until priming, cranking or driving pulls it into the system. Petrol in Diesel is who to call, with the engine left off, and so it remains that way. Keep reading for three things: the effect petrol has inside a diesel engine, the signs of how far it has got, and the way to make sure you never do it again.
Petrol in a diesel: what does it do to the motor?
Passing through a motor, diesel is doing two jobs at once. It lubricates first, and only then does it burn. What stops the surfaces inside your high-pressure pump and the injectors from grinding against one another is the diesel flowing through them — they're made to very fine clearances.
Of those two tasks, petrol manages the first badly and the second never. The clattering comes from petrol being designed not to ignite when compressed, which is precisely the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips away the lubrication the system depends on, and any pump working on that mixture is wearing itself.
Put those together and the shape of the trouble is clear. Contact doesn't do the damage — circulation does. Where the petrol is only inside your tank, it's a fault of fuel, nothing more. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with the fuel to your injectors downstream.
Lennoxtown, petrol in a diesel: four situations, from mild to significant
Filled but never started — as good as it gets. The petrol is in the tank and only the tank, and the job is a drain and a flush where the car stands. This is the one situation that can only really occur on a forecourt, as anywhere else the vehicle has been driven to get there.
A moment's running, or merely the ignition on. Your system has been primed, so petrol has left your tank and reached your filter and the fuel lines. Still normally simple: drain, flush, and your filter seen to.
Your pump now spent a few miles on thinned fuel — that's what driving the car meant. Tank, lines, filter, then fresh fuel run through the entire circuit: that's this work, and the way the car was driven matters as much as the mileage. Short trips, such as the school run to the local primary school, are one matter. Very different a second time: a trip to Glasgow, under 10 miles away, or some distance on the M80, under 10 miles from Lennoxtown, where your engine kept working hard.
Driven till it complained. Clattering, a lumpy idle, smoke, a throttle that has gone soft. The fuel is not behaving like diesel any more, and your motor is telling you. Whether it is the verge on Slatefield, a lay-by or a side road, stop there then leave it. The fuel drain and flush-through still come first, and they sort it out: when a vehicle is stopped early, long-term damage is very uncommon.
What Lennoxtown people get told about petrol in a diesel — and the stories in it
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Nothing is removed by topping up — you're left with a bigger tank, still the same mixture. That advice presumes a diesel fuel system handles petrol by percentage. It does not.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. Smaller parts and higher pressure are the way a modern diesel runs its fuel, and that makes the lubrication count more, not less.
"It starts, it drives, and so no harm done" — the myth that catches more drivers than any other. The driver of a petrol engine fed diesel normally stops, because it will not run, and the damage stops with them. While your pump wears, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Running is not the same as fine.
Myth: "Add some two-stroke oil and drive it home." It is an outdated fix for a separate issue. That petrol is still inside the tank afterwards, and whatever it has weakened isn't put back.
Once the motor has been run, part of the petrol is in the filter and the fuel lines, not the tank — and the next start sends it right back through your pump. So the myth "drain the tank yourself and you're sorted" doesn't hold. Besides, petrol emptied into a can by the road is truly dangerous.
How does petrol in a diesel happen?
Nobody does it on purpose, and it's seldom carelessness. One way only, because of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, while the diesel one generally will not fit a petrol car. That is how the forecourt makes it easy.
The moment habit stops matching the vehicle is the moment it takes place. A car that is new to you — hired, on loan as a courtesy car, or just bought. Households running one of each, petrol and diesel. Your usual forecourt, its pumps now in a different order. Racing for a train outside Lenzie and filling up en route. A new-to-you diesel Renault Clio, its first fuelling, and a motorist used to petrol: precisely when it happens. Add rain, a phone call or a back seat full of children, and your hand repeats what it has always done.
Preventing petrol in a diesel next time you fill up around Lennoxtown
- Read the pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on every forecourt. The label is what counts.
- In a motor you do not know, look inside the flap over the filler or at the cap before the first fill: many cars print the fuel type there.
- Label your key. In a household with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- It seems daft and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump.
- Whilst you're thinking about something else, this is an easy mistake to make — so put your phone away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to reject a petrol nozzle, and add-on devices are available for motors without one. They are a safety net, not a reason to stop reading the pump.
- Stop the moment you notice. Less petrol in the tank makes a weaker blend. It doesn't change what to do next, which is still not to crank it.
Petrol already in a diesel in Lennoxtown? Start here
Short and simple, then, is the order of things. Starting it is out, and so is switching on the ignition. If you are still at the forecourt — Thames or anywhere else — ask the staff to help you roll the car away from the petrol pump. Next, 0333 366 0103. We will ask what went in, roughly how much, and if it's been run.
Say so if it was AdBlue rather than petrol: it's a separate issue, with its own page for Lennoxtown, because AdBlue brings corrosion and deposits instead of lost lubrication.
Lennoxtown petrol in a diesel tasks: why one costs more than another
An honest single quote doesn't exist here: four situations, four separate jobs. Which of them you are in is chiefly what shifts the cost. Two things follow that: the petrol that went in as a share of what the tank takes, then the spot your car is in and whether a technician can reach it safely.
That is why we ask three queries before costing instead of after: what got in, how much, and whether it's run. The replies turn a range into a straight figure.
About Lennoxtown itself
Lennoxtown is a village situated on the banks of the River Kelvin in East Dunbartonshire, with a mix of semi-detached housing and other residential properties. Lennoxtown lies close to the Campsie Fells, near the villages of Balgrochan, Haughhead, and Clachan of Campsie. Lennoxtown has a population of around 2226 people and is located approximately 7.7 miles from Glasgow. Lennoxtown occupies a relatively low-lying area, with an elevation of about 65 metres above sea level.
Across East Dunbartonshire and in Lennoxtown: fuel drain cover
Our vans answering petrol in diesel calls in Lennoxtown, in the G postcode area, also work the spots around it, Balgrochan, Haughhead and Clachan of Campsie among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots we work, and your car does not need to move to us.
In Lennoxtown and still at the petrol pump?
Then, you couldn't be in a better spot. Call, and leave it switched off.