Should You Worry? Petrol in a Diesel Car in Liden
If it hasn't been started, you can worry far less than you probably are. Till your ignition primes the pump, the starter turns, or your vehicle is driven, petrol in a diesel tank simply waits there and does nothing. Which makes the honest reply to the first Liden query — "have I ruined it?" — normally no. To keep the vehicle that way, call Petrol in Diesel and leave the engine switched off. What petrol really does to a diesel, how to gauge how far it has travelled, and how to keep it from happening a second time: that's the remainder of this page.
Inside the motor: what petrol in a diesel really does
Diesel has two tasks on its way through a motor. It combusts, and before it combusts it protects. Designed to very fine gaps, your injectors and your pump depend on your diesel flowing through them to keep their surfaces from wearing against one another.
Poorly at the first, not at all at the second: that is petrol. It is 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 made to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That's where the rattling comes from.
Seen together, they make clear the shape the issue has. Not contact but circulation is what does the damage. All a tank with petrol in it amounts to is a fuel problem. A pump that has been working on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with your fuel to your injectors further on.
Petrol in a diesel around Liden: how serious is it? Four situations
Filled up, not once started. The best case there is. Being on a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With that petrol kept inside that tank alone, it is drained and flushed right where it stands, and nothing more is needed.
Started for a second, or just the ignition on. Petrol has come out of the tank and reached the filter and the lines, since the system has been primed. Normally little more than emptying, flushing and seeing to the filter, and so still easy.
Those few miles driven meant the pump running on fuel weakened by petrol throughout. How hard your car was driven counts as much as how far, and this work takes in the tank, the lines, the filter and clean fuel through the entire system. A school run to Liden Academy is one matter. Any distance on the M4, under 3 miles from Liden, means the motor has worked hard throughout, and a run to Oxford, under 25 miles away, makes a very different task too.
Knocking, a ragged idle, smoke, a throttle gone soft: driven until it complained. The fuel isn't behaving like diesel any more, and your motor is telling you. Pull up wherever you are — the verge on Snodshill, a lay-by, a side street — and leave the vehicle there. What comes first is still the drain and flush, and that deals with it, with long-term damage very rare if a car is pulled over soon.
What Liden drivers get told about petrol in a diesel — and the stories in it
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. A fuller tank of the same mixture is all it gives, because topping up takes out nothing. The assumption behind that advice — that diesel fuel systems accept petrol by percentage — is wrong.
"Newer diesels can handle a little petrol" — a myth, and nearer the reverse. At higher pressure, through finer parts: that's how a current diesel moves its fuel, so the lubrication matters for more, not less.
Myth: "If it starts and drives, there is no damage done." This is the one that catches drivers. Feed diesel to a petrol engine and it generally won't run, so the motorist stops — and the harm stops with them. Whilst your pump wears, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. A running engine does not mean fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an old workaround for a separate issue. The petrol is still in that tank after that, and what it has weakened is not put back.
"Drain it yourself and you are sorted" — a myth, because after it's been running some petrol sits in the filter and lines, ready to go straight back through your pump at the next start. It's also really risky to drain petrol into a can at the kerbside.
Petrol in a diesel: how does it take place?
Carelessness is rarely the cause, and no one means to do it. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle generally won't go into a petrol vehicle at all. So the error runs one way.
The moment routine stops matching your car is the moment it occurs. A car that's new to you — hired, on loan as a courtesy car, or just bought. Households running one of each, petrol and diesel. A well-known forecourt with the pumps in a different order. Racing for a train outside Swindon 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. Throw in rain, a phone call or a back seat full of kids, and the hand repeats what it has always done.
How to avoid petrol in a diesel at your next fill-up in Liden
- Check the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on each forecourt. The label is what matters.
- In a motor you do not know, look inside the flap over your filler or at the cap before the first fill: plenty of cars print the fuel there.
- Good intentions count for less than a sticker or a fob in a bright colour on your diesel's key when a home has one of each. So label it.
- "Diesel", out loud, before you lift the nozzle — each time a new or hired car gets its first tank. It seems silly. It does the trick.
- While you are thinking about something else, this is an easy mistake to make — so put your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to refuse a petrol nozzle, and aftermarket devices are available for the remainder. Count it as a backstop, then keep reading the pump.
- Noticing it mid-fill? Stop there and then. A thinner mixture follows from less petrol inside your tank, but your next stage remains the same: don't crank it.
Put petrol in a diesel around Liden already?
Short and simple, then, is the order of things. Don't switch the ignition on, and don't start it. If you are still on the forecourt — BP or anywhere else — ask the attendants to help you roll the car clear of the pump. Then ring 0333 366 0103 and tell us what got in, roughly how much, and whether it has run.
Say so if it was AdBlue rather than petrol: it is a separate problem, with its own page for Liden, because AdBlue brings corrosion and deposits rather than lost protection.
Why one petrol in a diesel task around Liden costs more than another
Four separate tasks sit behind the four scenarios above — which is why there's no fair single price. What moves your cost is mostly which of them you are in. Next it's the proportion — how much petrol got in against how much that tank takes — and after that where the vehicle is and whether a van can reach it safely.
Ahead of any quote, not after, come three queries: the fuel that was put in, the amount, and whether it's run. That is why. With the replies, you get a straight figure instead of a range.
About Liden and its setting
Liden is a suburban area in Wiltshire, situated near the banks of the River Cole, with a mix of semi-detached housing and local amenities. Liden sits at an elevation of around 112 metres, close to the nearby places of Eldene, Coate, and Dorcan. Liden is located near the city of Oxford, which is approximately 24.9 miles away, and is also within commuting distance to London, around 69.2 miles to the east. Liden has a population of around 4537 people, living in a predominantly residential area.
Fuel drain cover across Wiltshire, Liden included
Liden sits in the SN postcode area, and the vans that answer petrol in diesel calls there work the places around it as well — Eldene, Coate and Dorcan among them. A forecourt, a supermarket car park, a lay-by or your own drive are all locations our engineers drain, and your car does not need to come to us.
At the petrol pump around Liden, right now?
Then you're in the best place there can be. Ring, and leave it switched off.