Petrol in a Diesel Car in Ludlow: How Worried Should You Be?
Less than you likely are, if it has not been started. Petrol resting in a diesel tank does nothing to your engine till something pulls it through the system — your ignition priming your pump, the starter, or driving on its own. So the truthful answer to the first query everyone in Ludlow asks, "have I wrecked it?", is generally no. To leave the car like that, phone Petrol in Diesel then leave your motor alone. Below, this page sets out what petrol actually does inside a diesel, how far it may have got, and how to stop it happening to you again.
Petrol in a diesel: what does it do to your engine?
Two jobs fall to diesel on its route through a motor. It lubricates first, and only then does it burn. What keeps the surfaces inside your high-pressure pump and the injectors from wearing down against one another is the diesel passing through them — they're made to very fine gaps.
Poorly at the first, not at all at the second: that's petrol. Being less viscous than diesel, petrol strips away the lubrication a fuel system needs, leaving a pump running on the mixture to wear itself. It is also made to resist igniting under compression — the opposite of what a diesel needs — which is why you get the knocking.
The shape of the problem is plain when you put those together. Not contact but movement is what causes the harm. Petrol in the tank is a fuel fault. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with your fuel to your injectors further on.
Four scenarios we see in Ludlow: how serious is petrol in a diesel?
Fuelled but never started — as good as it gets. On a forecourt, and truly only there, that petrol is still limited to the tank — since everywhere else the car was driven to reach it. The job is emptying and cleaning on the spot.
Your ignition turned on, or a brief start. The system has been primed, so petrol has left that tank and got to your filter and your lines. Still usually easy: drain, flush, and your filter seen to.
Your pump now worked a couple of miles on thinned fuel — that is what driving it does. Tank, lines, filter, then fresh fuel run through the entire circuit: that's this work, and the way your car was driven counts as much as the mileage. Driving the children to St Laurence CofE Primary School is one sort of trip. Any miles on the M54, under 25 miles from Ludlow, means the motor working hard throughout, and a run to Hereford, under 25 miles away, makes a very different task as well.
Driven till it complained. Knocking, a ragged idle, smoke, a throttle that has gone soft. What you are hearing is the motor signalling fuel that no longer runs like diesel. Stop where you are — on the verge on High Street, at the kerb, down a side road — and don't move it. The fuel drain and flush-through still go first, and they sort it out: if a vehicle is stopped soon, permanent damage is very uncommon.
Ludlow drivers and the petrol in a diesel stories they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Nothing is removed by topping up — you're left with a bigger tank, still the same mix. The idea behind that guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." More precise components and higher pressure are how a modern diesel runs its fuel, and that makes the lubrication count more, not less.
"It starts, it drives, so there is no harm" — the myth that trips up most drivers than any other. Any petrol engine fed diesel normally won't run, and so the driver stops and the harm stops with them. A diesel fed petrol usually starts, ticks over and drives away as if nothing has happened, while the pump wears. Fine and running are not the same at all.
Not so: a two-stroke additive lets you to drive home. It was an old fix, meant for another fault. It doesn't put back what petrol has thinned, and that petrol is still inside the tank later.
The next start sends petrol back round the pump from your lines and your filter, where some of it sits once the motor has run. That's why draining your tank yourself doesn't sort it — a myth. Also, a can of petrol filled by the roadside is genuinely hazardous.
Why petrol in a diesel takes place so easily
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle generally will not fit a petrol vehicle, but the slimmer petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake simple, and only in that direction.
It takes place when routine and the car stop matching. A new car, a hire car or a courtesy car. Two cars on one drive, one petrol, one diesel. Your usual forecourt, its pumps now in a different order. A train to catch, and a hurried fill en route to the nearest station. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist used to petrol: precisely when it takes place. With rain, a call coming in, or a car full of children to deal with, the hand just does what it always has.
Avoiding petrol in a diesel next time you fill up in Ludlow
- Green for unleaded and black for diesel is normal in the UK — yet not on each forecourt. Trust the label on the pump, not the colour.
- Many cars state the fuel type inside your filler flap or on the cap, and so check there on your first fill in a motor you do not know.
- A coloured fob or a sticker on the diesel's key does more than any amount of intending to remember, for a house with one of each.
- It seems silly and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the pump.
- Whilst you're 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 are available for cars without one. They are a backstop, not a reason to stop reading the pump.
- Noticing it halfway? Stop at once. A weaker blend follows from less petrol inside the tank, but the next step remains the same: don't fire it up.
Petrol already in a diesel around Ludlow? Start here
Then the order of things is brief. Don't crank it, and do not switch the ignition on. The staff on the forecourt — whether at Applegreen itself or wherever you filled up — will normally help push it clear of the petrol pump if you ask. Then call 0333 366 0103 and tell us what got in, roughly how much, and if it has run.
Corrosion and deposits are the problem with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and see its own Ludlow page.
One petrol in a diesel job around Ludlow costs more than another. Why?
The four scenarios above are four different jobs, so no single price for this would be honest. What moves your cost is mostly which of them you're in. Beyond that it is the proportion — how much petrol got in against how much your tank takes — and after that where the car is and whether our van can reach it safely.
Three questions come first, before quoting, instead of after — what was put in, how much, has it run — and this is the reason. A range becomes a straight figure once those answers are in.
About Ludlow, briefly
Ludlow is a historic town situated on the River Teme in Shropshire, with a mix of old and new buildings, including many terraced houses. Ludlow sits at an elevation of 113 metres, surrounded by rolling countryside and nearby villages such as Ludford and Rockgreen. Ludlow is located approximately 21 miles from Hereford and 125 miles from London, making it a rural town with good transport links. Ludlow has a population of around 10,293 people, living in a range of housing types, predominantly terraced properties.
Ludlow and Shropshire: where our fuel drain cover runs
Petrol in diesel calls around Ludlow — part of the SY postcode area — go to vans that likewise cover the spots about it, Ludford, Rockgreen and Priors Halton among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations our technicians work, and the car doesn't need to move to us.
Still at the petrol pump in Ludlow?
The best position there is, then — that's where you are. Switched off it stays; then phone.