Ludford: Petrol in a Diesel Car? How Worried to Be
If it hasn't been started, worry far less than you probably are. Until the ignition primes your pump, the starter cranks, or the car is driven, petrol in a diesel tank simply sits there and does no harm. Which means the truthful reply to that first Ludford question — "have I ruined it?" — usually no. To leave the car that way, call Petrol in Diesel then leave your motor alone. What petrol actually 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 remainder of this page.
Your engine and petrol in a diesel: what goes on
On its way through a motor, diesel does two jobs. It lubricates to begin with, and only then does it burn. The high-pressure pump and your injectors are designed to extremely fine clearances, and your diesel passing through them is what stops those surfaces from grinding against one another.
The second job petrol doesn't do at all, and the first it does poorly. The clattering comes from petrol being designed not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips out the protection the fuel system hinges on, and any pump running on such a blend is wearing itself.
Combined, those make the shape of the issue clear. The damage is done by circulation, not by contact. All a tank with petrol in it amounts to is a fuel problem. The start of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds moves on with your fuel to your injectors beyond it.
Ludford, petrol in a diesel: four situations, from mild to major
Filled up, not once started. The best case there is. At a forecourt, and really only there, the petrol is still limited to your tank — since anywhere else the car was driven to get to it. The task is draining and purging on the spot.
Ignition on, or started for a moment. With your system primed, the fuel lines and filter already contain petrol that came from your tank. Still usually straightforward: drain, flush, and the filter seen to.
Driven a couple of miles. Now your pump has spent those miles working on thinned fuel. Mileage is only half of it; how hard it was driven matters equally. Either way this work includes the tank, the fuel lines, your filter and clean fuel through the whole circuit. Driving the kids to St Laurence CofE Primary School is one kind of trip. A run as far as Hereford, under 25 miles away, is a very different task. So is any distance on the M54, under 25 miles from Ludford, where the motor has been labouring hard throughout.
It protested, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. The fuel isn't behaving like diesel any more, and the engine is saying so. Whether it's the verge on Whitcliffe Road, a lay-by or a side road, stop there and leave it. What goes first is still the drain and flush, and that takes care of it, with long-term damage very uncommon if a car is stopped soon.
What Ludford people get told about petrol in a diesel — and the stories in it
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 fuller tank, still the same mixture. A diesel fuel system doesn't accept petrol by percentage in the way that guidance presumes.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. Smaller components and higher pressure are the way a newer diesel runs its fuel, and that makes the lubrication count more, not less.
"It starts, it drives, so no harm done" — the myth that trips up most people than any other. A petrol motor fed diesel generally will not run, so the motorist stops and the harm stops with them. A diesel fed petrol normally starts, ticks over and drives away as if nothing has happened, while your pump wears. Fine and running are not the same at all.
An old workaround for a different issue lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." None of what petrol diluted gets put back by it — and later, that tank still contains that petrol.
If the motor has run, part of that petrol sits in your filter and the lines, not that tank — and your next start pulls it right back through your pump. So the myth "drain your tank yourself and you are sorted" doesn't hold. Draining petrol into a can by the kerbside is also really risky.
Why petrol in a diesel takes place at all
It's rarely carelessness, and no one does it on purpose. One way only, since of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one mostly won't fit a petrol motor. That's how the forecourt makes it simple.
When habit and the vehicle stop matching, it takes place. Any vehicle that's new to you — hired, on loan as a courtesy car, or brand new. Households running one of each, petrol and diesel. A forecourt you know, but with its pumps arranged differently. Rushing for a train at Ludlow and filling up en route. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it happens. With rain, a call arriving, or children to deal with, the hand just does what it has always done.
Preventing petrol in a diesel next time you fill up in Ludford
- The label is what counts, so read the pump instead of the colour: in the UK unleaded handles are usually green and diesel black, yet not on every forecourt.
- The first fill in a new car is the time to check your filler flap — inside it, or on the cap, many vehicles state which fuel to use.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of intending to remember, in a house with one of each.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump. It sounds daft and it works.
- While you are thinking about something else, this is an easy mistake to make — so put your phone away.
- Some diesels come with a filler designed to block a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the pump.
- Spotting it halfway? Stop there and then. A thinner mix follows from less petrol in your tank, but the next step remains the same: don't start the car.
Petrol already in a diesel around Ludford? Begin here
The order of things is brief, then. Starting it is out, and so is switching on the ignition. Yet at the forecourt, at Applegreen or anywhere else? Ask the staff to help you roll the vehicle clear of the pump. Call 0333 366 0103 next, with three answers — the fuel, the approximate volume, and if it has run.
Corrosion and deposits are the issue with AdBlue, whereas petrol means lost lubrication. So if it was AdBlue, say so — and see its own Ludford page.
What makes one Ludford petrol in a diesel job cost more than the next
Four different jobs lie behind the four situations above — which is why there's no honest single quote. The situation itself does most of the work of moving your cost. The ratio counts next, meaning how much of your tank is petrol, followed by the position of the car and whether getting to it is safe for a van.
Before any quote, not after, we ask three questions: your fuel that got in, its quantity, and if it has run. That's why. With the answers, you get a straight figure rather than a range.
About Ludford
Ludford is a village situated on the banks of the River Teme in Shropshire, with a mix of terraced housing and other residential properties. Ludford sits at an elevation of 93 metres, close to the historic town of Ludlow and other nearby places like Sheet and Rockgreen. Ludford is located near the city of Hereford, approximately 21 miles away, and is around 125 miles from London. Ludford remains a small riverside community with a population of around 1176 residents.
Across Shropshire and in Ludford: fuel drain cover
Petrol in diesel jobs around Ludford — part of the SY postcode area — go to teams that likewise cover the places around it, Ludlow, Sheet and Rockgreen among them. You need not bring your car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all locations we drain.
Ludford: still at the pump?
Then you're in the best place there is. Keep it off. Call.