Petrol in a Diesel Car in Wilsden: How Worried Should You Be?
Far less than you probably are, provided it has not been started. Everyone in Wilsden starts with "have I wrecked it?", and the honest answer is generally no: petrol resting inside that tank of a diesel remains harmless until priming, cranking or driving pulls it into the system. Leave your engine off and call Petrol in Diesel — that keeps it that way. Further down, you will find what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you a second time.
Your engine and petrol in a diesel: what goes on
Passing through an engine, diesel is doing two things at the same time. It ignites, and before it ignites it lubricates. Very fine clearances go into the fuel injectors and the high-pressure fuel pump, and only your diesel flowing through keeps their surfaces from grinding together.
The second job petrol does not do at all, and the first it does badly. It's thinner than diesel and removes the lubrication the system rests on, and so a pump running on a petrol mixture is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That's where the knocking comes from.
Combined, those make the shape of the issue clear. Not contact but circulation is what causes the damage. Where that petrol is only in that tank, it's a fault of fuel, nothing more. Whatever a worn pump sheds goes on, carried by your fuel, into the fuel injectors further along, which is why a pump that has been working on the petrol is where a mechanical issue begins.
How bad is petrol in a diesel? Four scenarios our engineers see around Wilsden
Fuelled but never started — as good as it gets. At a forecourt, and truly only there, that petrol is still limited to your tank — since everywhere else your car was driven to get to it. The task is draining and purging on the spot.
The ignition switched on, or a brief start. Once primed, the system has drawn petrol from the tank as far as your filter and the lines. Usually little more than draining, flushing and sorting your filter, so still simple.
A couple of miles driven, and the pump has spent each of them running on diluted fuel. Mileage is only half of it; how hard it was driven matters equally. Either way the work runs to that tank, the lines, the fuel filter and clean fuel through the entire circuit. On the school run to Wilsden Primary School, the distance is short. A run as far as Bradford, under 5 miles away, is a very different task. So is any distance on the M606, under 10 miles from Wilsden, where your engine has been running hard throughout.
Driven on till it protested — rattling, smoke, an uneven idle, a soft throttle. What you are hearing is the engine reporting fuel that no longer acts like diesel. Leave it wherever it stops: a lay-by, a quiet street, the verge on Crack Lane. Permanent damage is very unusual when a vehicle is pulled over soon, and the drain and flush-through that still go first take care of it.
What Wilsden drivers get told about petrol in a diesel — and the stories in it
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 fuller tank of the same mixture. Percentage is not how a diesel fuel system copes with petrol, whatever that guidance assumes.
If anything, the reverse holds. Myth: "A modern diesel can cope with a bit of petrol." Lubrication counts more on current diesels, not less, because their fuel runs through finer parts at higher pressure.
This is the one that fools motorists. Myth: "If it starts and drives, there's no damage done." Feed diesel to a petrol engine and it generally will not run, so the driver stops — and the damage stops with them. While the pump wears, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Being able to run isn't the same as being fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a different issue. It does not put back what petrol has thinned, and the petrol is still in that tank later.
"Drain it yourself and you are sorted" — a myth, because after it has been running some petrol lies in the filter and lines, ready to go straight back through your pump at the next start. Also, a can of petrol filled by the kerbside is truly risky.
How does petrol in a diesel take place?
Carelessness is seldom the cause, and nobody means to do it. A diesel nozzle mostly won't fit a petrol car, but the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error easy, and just in one direction.
The moment routine stops matching your car is the moment it happens. Hire cars, courtesy cars, and vehicles that are new to you. A household with one petrol and one diesel on the driveway. Your ordinary forecourt, its pumps suddenly in a different order. A rushed fill en route to Bingley with a train to catch. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is exactly the moment it takes place. With rain, a call arriving, 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 in Wilsden
- The label is what matters, and so read the pump rather than the colour: in the UK unleaded handles are normally green and diesel black, yet not on every forecourt.
- Many cars state the fuel inside the filler flap or on the cap, and so check it on the first fill in any car you do not know.
- Mark the 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 intending to remember.
- It seems silly and it works: on your first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump.
- Thinking about something else is when this becomes an easy mistake to make, so put your phone away and keep your mind on the petrol pump.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to refuse a petrol nozzle, and add-on devices exist for the remainder. Count it as a safety net, and keep checking the petrol pump.
- Less petrol makes a thinner blend, and so stop the moment you realise — while remembering that your next step is unchanged. It's still not to fire it up.
Put petrol in a diesel in Wilsden already?
Short and simple, then, is the order of things. Don't turn your ignition on, and don't start it. Ask the attendants to help you push it clear of the pump if you are still on the forecourt, whether that is Texaco or somewhere else. Then ring 0333 366 0103 and tell us what was put in, about how much, and if it has run.
If it was AdBlue and not petrol, say so. That's a separate issue — corrosion and deposits and not lost lubrication — and it has its own page for Wilsden.
What makes one Wilsden petrol in a diesel task cost more than the next
The four situations above are four separate jobs, so no single price for this would be honest. Mostly, your cost shifts with which one you are in. Beyond that it's the proportion — how much petrol went in against how much the tank takes — and then where your car is and whether our van can get to it safely.
What got in, how much, and whether it has run — three queries our engineers ask before costing, not after, for exactly that reason. Given the replies, you get a straight figure rather than a range.
About Wilsden itself
Wilsden is a village in West Yorkshire, situated on the riverside at an elevation of 211 metres, with semi-detached housing being the predominant type of accommodation. Wilsden lies approximately 4.8 miles from Bradford and 175.6 miles from London, making it a commuter village with easy access to nearby cities. Wilsden is surrounded by nearby places such as Norr, Lingbob, and Bents Head, and has a population of around 2203 residents. Wilsden's location in the Yorkshire and the Humber region makes it a part of a larger urban and rural landscape.
Fuel drain cover around Wilsden and across West Yorkshire
Norr, Lingbob and Bents Head are among the places near Wilsden that the same vans work, answering petrol in diesel jobs across Wilsden's BD postcode area. A forecourt, a supermarket car park, a lay-by or your own drive are all spots our technicians drain, and your car doesn't need to move to us.
At the petrol pump in Wilsden, right now?
Then you're in the best place there is. Leave the car switched off, and ring.