Petrol in a Diesel Car in Windsor: How Worried Should You Be?
Likely less than you are now — as long as nobody has started it. Petrol resting in a diesel tank does nothing to the engine until something pulls it through the system — your ignition priming your pump, your starter, or the drive itself. So the fair answer to the first question anyone around Windsor asks, "have I wrecked it?", is normally no. Petrol in Diesel is who to call, with the engine kept off, and so it stays that way. The rest of this page covers what petrol really does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you again.
Petrol in a diesel: what does it do to your engine?
Diesel does two tasks on its way through a motor. Lubricating comes before burning; it does both. Designed to extremely fine tolerances, your injectors and the pump depend on the diesel flowing through them to keep their surfaces from wearing against one another.
Petrol does the first job poorly and the second not at all. A pump running on a petrol mixture is wearing itself out, because petrol is thinner than diesel and strips out the protection your fuel system relies on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that is where the rattling starts.
Put these together and the shape of the trouble is plain. The damage is done by movement, not by contact. Where that petrol is only in the tank, it is an issue of fuel, nothing more. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with the fuel to the fuel injectors downstream.
Windsor, petrol in a diesel: four cases, from mild to serious
Fuelled, and never started: nothing beats it. Just that tank has petrol in it, so the task is draining that tank and cleaning your system where your car sits. This situation can only really occur at a forecourt: anywhere else, your car got there by being driven.
Ignition on, or started for a second. The system has been bled, and so petrol has left the tank and reached your filter and the lines. Normally little more than draining, flushing and seeing to the fuel filter, and so still easy.
A few miles driven, and your pump has spent each of them running on weakened fuel. The work is the tank, your lines, your filter and fresh fuel through the entire circuit, and how hard the vehicle was driven matters as much as how far. Driving the children to Trinity St Stephen CofE Aided First School is one sort of trip. Very different a second time: a trip to Westminster, under 25 miles away, or any mileage on the M4, under 3 miles from Windsor, where the engine never stopped working hard.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone lumpy. The motor is telling you your fuel is no longer acting like diesel. Whether it is the verge on Alexandra Road, a lay-by or a side street, stop there and leave it. The fuel drain and flush-through still go first, and they deal with it: if a car is stopped early, permanent damage is very uncommon.
Stories Windsor drivers hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing comes out when you top up — your tank simply carries more of the same blend. Percentage isn't how a diesel fuel system copes with petrol, however much that advice supposes.
If anything, the opposite holds. Myth: "A modern diesel can cope with a bit of petrol." Smaller components and higher pressure are the way a modern diesel runs its fuel, and that makes the lubrication matter more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there's no harm done." The motorist of a petrol motor fed diesel usually has no choice but to stop, because it will not run, and the damage stops there. While the pump wears, a diesel fed petrol usually starts, ticks over and drives away as if nothing has happened. Being able to run is not proof of being fine.
An outdated fix for a distinct fault lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." The petrol is still inside your tank afterwards, and what it has diluted isn't put back.
The next start sends petrol back round your pump from the lines and the fuel filter, where some of it ends up after your engine has run. That is why draining your tank yourself does not leave you sorted — a myth. Besides, petrol drained into a can by the road is truly dangerous.
Petrol in a diesel: how does it happen?
Nobody does it on purpose, and it is seldom carelessness. 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, while a diesel nozzle generally will not go into a petrol motor at all. So the slip runs one way.
The moment routine stops matching the vehicle is the moment it occurs. Hire cars, courtesy cars, and cars that are new to you. Two vehicles on one driveway, one petrol, one diesel. A well-known forecourt with the pumps in a different order. Fuelling up in a hurry en route to Windsor & Eton Central, with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist accustomed to petrol: precisely when it happens. Throw in a back seat full of children, a phone call or rain, and habit wins.
How to avoid petrol in a diesel at your next fill-up in Windsor
- A green handle for unleaded and black for diesel is usual in the UK — yet not on every forecourt. Go by the label on the petrol pump, not the colour.
- In a car you do not know, look inside the flap over the filler or at the cap before your first fill: many vehicles state the fuel type there.
- A coloured fob or a sticker on the diesel's key does more than any amount of intending to remember, in a household with one of each.
- It sounds silly and it works: on your first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the petrol pump.
- Mistakes like this are simple to make while your mind is on something else, and so the phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler built 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 blend, and so stop as soon as you notice — while remembering that the next stage is unchanged. It is still not to crank it.
Already put petrol in a diesel around Windsor?
Short and simple, then, is the order of things. Leave it unstarted, with the ignition switched off too. Ask the attendants to help you push it away from the petrol pump if you are still at the forecourt, whether that is BP or somewhere else. What was put in, roughly how much, and if it has run: tell us those when you phone 0333 366 0103.
Say so if it was AdBlue rather than petrol: it is a separate issue, with its own page for Windsor, because AdBlue brings corrosion and deposits rather than lost protection.
Why one petrol in a diesel task in Windsor costs more than another
The four situations above are four separate jobs, so no single price for this would be fair. What shifts the cost is chiefly which of them you're in. Two things follow that: the petrol that went in as a proportion of what the tank holds, then the spot your car is in and whether a van can reach it safely.
That is why our technicians ask three queries before costing rather than after: what was put in, how much, and whether it's run. Given the replies, there is a straight figure instead of a range.
About Windsor, for a moment
Windsor is a historic town in Berkshire, situated on the River Thames at an elevation of around 30 metres. Windsor sits approximately 20.9 miles west of central London, with nearby places including Eton, Clewer Village, and Spital. Windsor has a population of around 15994 people, predominantly residing in flats. Windsor is characterized by its riverside setting and proximity to the capital city.
Fuel drain cover across Berkshire, Windsor included
Windsor sits in the SL postcode area, and the teams that answer petrol in diesel calls there work the locations near it as well — Eton, Clewer Village and Spital among them. A forecourt, a supermarket car park, a lay-by or your own drive are all locations we work, and your car does not need to come to us.
In Windsor and still at the pump?
Nothing beats it: that's where you are. Turned off it stays; then call.