Petrol in a Diesel Car in Thurso East: How Worried Should You Be?
Provided it has not been started, you can worry less than you likely are. "Have I ruined it?" is the first question everyone around Thurso East asks, and the honest answer is normally no, since petrol resting in a diesel tank hurts nothing till it is drawn through the system — by ignition priming, by the starter, or by being driven. Leave the motor off then ring Petrol in Diesel — that keeps it like that. Below, you will find what petrol really does inside a diesel, how far it may have got, and how to stop it happening to you again.
The engine and petrol in a diesel: what goes on
Passing through an engine, diesel is doing two things at once. It ignites, and before it ignites it protects. The high-pressure fuel pump and the fuel injectors are made to extremely fine gaps, and your diesel passing through them is what stops those surfaces from grinding against one another.
Poorly at the first, not at all at the second: that is petrol. It's thinner than diesel and strips away the lubrication your fuel system depends on, 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 opposite of what a diesel needs from its fuel. That's where the rattling comes from.
The shape of the problem is plain when you put those together. Contact doesn't do the damage — circulation does. A tank with petrol in it is a fuel issue. Once the pump has been working on that petrol, a mechanical fault has started: whatever is shed by a pump that is wearing is carried downstream to your injectors with your fuel.
Petrol in a diesel in Thurso East: how bad is it? Four situations
Fuelled, and not started: no case is better. On a forecourt, and genuinely only there, the petrol is still limited to the tank — since everywhere else the vehicle was driven to get to it. The task is emptying and flushing on the spot.
Ignition on, or started for a moment. Once primed, the fuel system has drawn petrol from your tank as far as the filter and the fuel lines. Still usually straightforward: drain, flush, and your filter sorted.
A couple of miles driven, and your pump has spent every one of them working on diluted fuel. The work is your tank, the fuel lines, the filter and clean fuel through the whole circuit, and how hard the car was driven counts as much as how far. On the school run to the local primary school, the miles is small. A run as far as Inverness, over 50 miles away, is a very different job. So is any miles on the M90, over 50 miles from Thurso East, where the engine has been labouring hard throughout.
Rattling, a ragged idle, smoke, a throttle gone soft: driven until it complained. The fuel is not acting like diesel any more, and your engine is saying so. Whether it is the verge on Castletown Road, a lay-by or a side street, stop where you are and leave it. Lasting damage is very unusual if a car is pulled over soon, and the fuel drain and flush-through that still go first take care of it.
Thurso East drivers and the petrol in a diesel stories they hear
Myth: topping up to full with diesel makes it fine. It doesn't. A fuller tank of the same mix is all it gives, because topping up takes out nothing. Percentage isn't how a diesel fuel system copes with petrol, however much that guidance presumes.
"Newer diesels can handle a little petrol" — a myth, and closer to the reverse. Protection matters more on newer diesels, not less, since their fuel runs through more precise components at higher pressure.
One myth that catches motorists out: if it starts and drives, it must be unharmed. Feed diesel to a petrol engine and it generally will not run, and so the motorist stops — and the harm stops with them. A diesel fed petrol normally starts, idles and drives away as if nothing has happened, while the pump wears. Being able to run isn't proof of being 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 weakened stays weakened, and the petrol stays in the tank anyway.
If your engine has been run, part of the petrol sits in the fuel filter and the fuel lines, not your tank — and the next start pulls it straight back through the pump. So the myth "drain the tank yourself and you are sorted" does not hold. And, a can of petrol drained at the kerbside is genuinely risky.
How does petrol in a diesel happen?
Carelessness is rarely the cause, and nobody means to do it. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle mostly will not go into a petrol car at all. So the mistake runs one way.
It takes place when habit and the car stop matching. Courtesy car, hire car, or a motor that's new. 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 outside Thurso and fuelling up en route. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is exactly the moment it happens. With rain, a call arriving, or a car full of children to deal with, your hand simply does what it has always done.
Thurso East 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. Go by the label on the petrol pump, not the colour.
- Check the filler flap. Plenty of vehicles state the fuel inside the flap or on the cap. Look at it on your first fill in a car you don't know.
- Good intentions do less than a sticker or a fob in a vivid colour on the diesel's key if a household has one of each. So mark it.
- Before the nozzle comes off the petrol pump the first time you fill a hired or new car, say "diesel" out loud. Daft, yes, yet it does the trick.
- Mistakes like this are simple to make while your mind is on something else, so your phone goes away.
- Add-on devices are available for motors without one, and some diesels are built with a filler that won't take a petrol nozzle. Useful — but a backstop only, never a reason to stop checking the label.
- Less petrol means a weaker mixture, so stop the moment you realise — while remembering that the next step is unchanged. It is still not to crank it.
Already put petrol in a diesel in Thurso East?
Then, there's just a short order of things. Leave it unstarted, with the ignition off too. Yet on the forecourt, at Gleaner or anywhere else? Ask the attendants to help you push it clear of the pump. Next, 0333 366 0103. We will ask what was put in, roughly how much, and if it has been run.
Corrosion and deposits form the problem with AdBlue, where petrol brings lost lubrication. So if it was AdBlue, say so — and see its own Thurso East page.
What makes one Thurso East petrol in a diesel task cost more than the next
Four separate jobs lie behind the four situations above — which is why there is no honest single price. Which of them you're in is mostly what moves your cost. Where your car is counts too, and whether our van can safely get to it, after the ratio of petrol to what your tank takes.
Three queries come first, before quoting, rather than after — what got in, how much, has it run — and that is the reason. With those answers, you get a straight figure instead of a range.
About Thurso East
Thurso East is a suburban area located on the northern coast of Scotland, with Thurso East sitting at an elevation of 18 metres above sea level. Thurso East is part of the larger town of Thurso, which is situated near the Pentland Firth, and Thurso East is characterized by its semi-detached housing stock. Thurso East is relatively distant from major cities, with London being approximately 508 miles to the south, and Inverness around 82 miles to the south.
Across Highland and in Thurso East: fuel drain cover
Petrol in diesel call-outs in Thurso East — part of the KW postcode area — go to teams that also cover the locations around it, Mountpleasant, Springpark and Thurso among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all places our technicians work, and the car doesn't need to come to us.
Thurso East: still at the pump?
No position is better: that is where you now are. Turned off it stays; then ring.