Bogthorn: Petrol in a Diesel Car? How Worried to Be
Probably less than you are now — as long as no one has started the car. Petrol sitting in a diesel tank does nothing to the motor till something draws it through the fuel system — your ignition priming your pump, the starter, or driving on its own. So the fair answer to the first query everyone in Bogthorn asks, "have I wrecked it?", is usually no. Leave your engine off and call Petrol in Diesel — that keeps it like that. Below, this page sets out what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you a second time.
What petrol in a diesel does to your engine
Two tasks fall to diesel on its route round a motor. It protects to begin with, and only then does it burn. The high-pressure pump and the fuel injectors are built to very fine tolerances, and your diesel passing through them is what stops those surfaces from wearing down against each other.
Of those two jobs, petrol manages the first badly and the second not at all. The clattering comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips away the protection your system depends on, and any pump working on that mix is wearing itself.
The shape of the problem is plain once you put those together. It is circulation that does the harm, not contact. Where the petrol is only in your tank, it is a problem of fuel, nothing more. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with your fuel to your injectors downstream.
Bogthorn, petrol in a diesel: four cases, from mild to serious
Fuelled but not once started — as good as it gets. That petrol is inside the tank and only your tank, and the job is a drain and a flush where the vehicle sits. This is the one situation that can only really occur on a forecourt, since anywhere else your car has been driven to get there.
A moment's running, or merely your ignition on. Once primed, the fuel system has pulled petrol from your tank as far as the filter and your lines. That's generally still an easy task — a drain, a flush, and the filter dealt with.
Driven a few miles. Now your pump has spent these miles labouring on weakened fuel. Tank, lines, filter, then fresh fuel run through the whole system: that is this work, and the way the car was driven counts as much as the distance. The school run to Worth Valley Primary School is one thing. Any mileage on the M606, under 10 miles from Bogthorn, means your engine has worked hard throughout, and a run to Bradford, under 10 miles away, makes a very different task too.
Driven till it complained. Clattering, a lumpy idle, smoke, a throttle that has gone soft. The engine is telling you your fuel is no longer acting like diesel. Whether it's the verge on Valley View Close, a lay-by or a side road, stop where you are then leave it. What comes first is still the fuel drain and flush-through, and that deals with it, with permanent damage very rare if a vehicle is stopped quickly.
Petrol in a diesel myths Bogthorn people hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. A bigger tank of the same mixture is all you get, since topping up takes out nothing. Percentage isn't how a diesel fuel system copes with petrol, whatever that advice presumes.
"Modern diesels can handle a little petrol" — a myth, and closer to the opposite. Lubrication matters more on current diesels, not less, since their fuel runs through more precise parts at higher pressure.
Myth: "If it starts and drives, there's no damage done." This is the one that catches motorists. Diesel in a petrol motor usually leaves a motor that will not run: the motorist stops, and so does the harm. Feed petrol to a diesel and it normally fires up, idles and pulls away like nothing has happened — all while its pump wears. Running does not mean fine.
Not so: a two-stroke additive makes it safe to drive home. It is an old workaround, meant for another problem. That petrol is still inside that tank after that, and what it has weakened isn't put back.
The next start sends petrol back round the pump out of the lines and the fuel filter, where some of that sits after the engine has run. That is why draining your tank yourself does not leave you sorted — a myth. Emptying petrol into a can by the kerbside is also truly risky.
How does petrol in a diesel take place?
No one does it on purpose, and it is seldom carelessness. The forecourt makes it easy: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle mostly won't go into a petrol car at all. So the slip runs one way.
Habit and your car getting out of step is how it happens. Hire cars, courtesy cars, and motors that are new to you. Households running one of each, petrol and diesel. The pumps in a different order on a well-known forecourt. Rushing for a train at Keighley and filling up en route. A new-to-you diesel Audi A4, its first fuelling, and a driver used to petrol: precisely when it takes place. The hand does what it has always done once you add rain, a phone call or a back seat full of children.
Preventing petrol in a diesel next time you fill up around Bogthorn
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Check the pump's label; the colour is just a clue.
- Inspect your filler flap. Plenty of vehicles state the fuel type inside the flap or on the cap. Look at it on your first fill in a vehicle you do not know.
- Good intentions do less than a sticker or a fob in a vivid colour on the diesel's key if a house has one of each. So label it.
- "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.
- While you are thinking about something else, this is an easy mistake to make — so tuck the phone away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject a petrol nozzle, and add-on devices exist for cars without one. They are a backstop, not a reason to stop reading the pump.
- Less petrol makes a thinner mixture, so stop the moment you realise — though remembering that the next stage is unchanged. It is still not to crank it.
Petrol already in a diesel around Bogthorn? Begin here
Then, there's only a short order of things. Do not turn the ignition on, and do not fire it up. Still at the forecourt, at Shell or anywhere else? Ask the staff to help you push the car away from the pump. Phone 0333 366 0103 next, with three facts — the fuel, the approximate volume, and whether it's run.
If it was AdBlue rather than petrol, say so. That's a different problem — corrosion and deposits and not lost lubrication — and it has its own page for Bogthorn.
Bogthorn petrol in a diesel tasks: why one costs more than another
A fair single quote doesn't exist here: four scenarios, four separate tasks. The situation itself does most of the work of moving the cost. Where your car is counts too, and whether our van can safely get to it, after the share of petrol to what the tank takes.
That is why our technicians ask three queries before costing rather than after: what got in, how much, and whether it's run. Those replies are what turn a range into one firm number.
About Bogthorn and where it is
Bogthorn is a suburban area in West Yorkshire, situated approximately 8 miles from Bradford and 178 miles from London, at an elevation of around 232 metres. Bogthorn occupies a position in the regional landscape near other local places such as Bracken Bank and Damems. Bogthorn has a population of around 3708 people, predominantly living in semi-detached housing. Bogthorn is characterized by its inland setting, with nearby areas including Cackleshaw.
Fuel drain cover across West Yorkshire, Bogthorn included
Petrol in diesel jobs in Bogthorn — part of the BD postcode area — go to vans that also cover the locations around it, Bracken Bank, Damems and Cackleshaw included. You need not move the car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots where we work.
In Bogthorn and still at the petrol pump?
The best place there is, then — that is where you are. Keep it off. Call.