Petrol in a Diesel Car in Harden: How Worried Should You Be?
Provided it has not been started, worry far less than you probably are. Petrol sitting in a diesel tank does nothing to the motor until something draws it through the fuel system — the ignition priming your pump, the starter, or the drive on its own. So the truthful answer to the first question everyone around Harden asks, "have I ruined it?", is usually no. Keep it like that: leave your motor off and phone Petrol in Diesel. What petrol really does to a diesel, how to judge how far it has gone, and how to keep it from happening a second time: that is the rest of this page.
What petrol in a diesel does to the motor
Passing through an engine, diesel does two things at the same time. It lubricates to begin with, and after that does it burn. Made to extremely fine clearances, your injectors and your pump depend on the diesel moving through them to stop their surfaces wearing against one another.
Poorly at the first, not at all at the second: that's petrol. It is runnier than diesel and takes away the lubrication the fuel system hinges on, and so a pump running on a petrol mixture 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.
The shape of the trouble is plain once you put those together. Contact does not do the damage — movement does. All a tank with petrol in it amounts to is a fuel issue. The start of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds travels on with your fuel to your injectors downstream.
Petrol in a diesel in Harden: how bad is it? Four cases
Fuelled up, never started. The best case there can be. Just the tank has petrol in it, so the task is draining your tank and purging the fuel system where the vehicle stands. This situation can only truly take place on a forecourt: anywhere else, your car got there by being driven.
A brief spell of running, or just the ignition on. With your system primed, your lines and filter already hold petrol that came from the tank. Drain, flush, deal with the filter: still normally straightforward.
Driven a few miles. Now the pump has spent those miles labouring on weakened fuel. How hard the car was driven counts as much as how far, and the work takes in that tank, the fuel lines, the filter and clean fuel through the entire circuit. Short trips, like the school run to Harden Primary School, are one matter. A run as far as Bradford, under 10 miles away, is a very different job. So is any distance on the M606, under 10 miles from Harden, where your engine has been labouring hard throughout.
Rattling, a lumpy idle, smoke, a throttle gone soft: driven until it complained. The fuel is not acting like diesel any more, and the engine is telling you. Stop wherever you are — the verge on Wilsden Road, a lay-by, a side street — then leave it there. What goes first is still the drain and flush, and that takes care of it, with permanent damage very rare if a vehicle is pulled over soon.
Harden motorists and the petrol in a diesel myths they hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Topping up removes nothing; it gives you a fuller tank of the same mix. A diesel fuel system doesn't accept petrol by percentage in the way that guidance presumes.
Myth: a modern diesel copes with a bit of petrol. If anything, the reverse. Smaller components and higher pressure are how a current diesel runs its fuel, and that makes the protection matter more, not less.
One myth that catches drivers off guard: if it starts and drives, it must be unharmed. Diesel in a petrol motor normally means a motor that won't run: the driver stops, and so does the harm. While your pump wears, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Being able to run is not the same as being fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a different issue. What petrol has thinned remains weakened, and that petrol remains inside the tank regardless.
Myth: "Drain the tank yourself and you are sorted." After your engine has run, some of the petrol is no longer in the tank: it's in your filter and your lines, and it goes straight back through your pump at the next start. Emptying petrol into a can by the roadside is also really risky.
How it happens: petrol in a diesel
On purpose? Never. Through carelessness? Rarely, if ever. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle mostly will not go into a petrol car at all. So the error runs one way.
When habit and the vehicle stop matching, it happens. Courtesy car, hire car, or a motor that is new. Households running one of each, petrol and diesel. Your ordinary forecourt, its pumps suddenly in a different order. A train to catch, and a rushed fill en route to Bingley. Years of petrol cars behind you, a diesel Volkswagen Passat in front of you at the forecourt for its first tank — that's when. Your hand does what it has always done once you add rain, a phone call or a back seat full of kids.
Next time you fill up around Harden: preventing petrol in a diesel
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most usually do. Read the petrol pump's label; the colour is just a clue.
- The first fill in a new vehicle is the time to check the filler flap — inside it, or on the cap, many motors state the fuel to use.
- 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 mark it.
- "Diesel", out loud, before you pick up the nozzle — each time a new or hired car needs its first tank. It seems silly. It works.
- Thinking about something else is when this becomes an easy mistake to make, so tuck your phone away and keep your mind on the pump.
- 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 vehicles without one. They are a backstop, not a reason to stop checking the petrol pump.
- Stop the moment you realise. Less petrol in the tank means a thinner blend. It does not change what to do next, which is still not to start the car.
Harden: already put petrol in a diesel?
Short and simple, then, is the order of things. Leave it unstarted, with your ignition off too. If you're still at the forecourt — BP or anywhere else — ask the staff to help you push it clear of the petrol pump. Then phone 0333 366 0103 and tell us what was put in, about how much, and if it has run.
Say so if it was AdBlue instead of petrol: it's a separate fault, with its own page for Harden, since AdBlue brings corrosion and deposits rather than lost protection.
Harden petrol in a diesel jobs: why one costs more than another
The four scenarios above are four separate tasks, so no single quote for this would be fair. Chiefly, your cost shifts with which one you are in. Where the car is counts too, and whether a van can safely get to it, after the proportion of petrol to what your tank takes.
Three queries come first, before any quote, rather than after — what was put in, how much, has it run — and this is the reason. Those answers are what change a range into one firm number.
About Harden itself
Harden is a village in West Yorkshire, situated on the banks of a river at an elevation of 142 metres. Harden lies approximately 5.9 miles from Bradford and is surrounded by nearby places such as Moor Edge, Ryecroft, and Bents Head. Harden has a population of around 1579 people and predominantly features detached housing.
Harden and West Yorkshire: where our fuel drain cover reaches
Our teams answering petrol in diesel call-outs in Harden, in the BD postcode area, also work the locations around it, Moor Edge, Ryecroft and Bents Head included. A forecourt, a supermarket car park, a lay-by or your own drive are all places our technicians drain, and your car does not need to come to us.
Harden: still at the pump?
No position is better: that's where you are. Switched off it remains; then phone.