How Worried Should You Be? Petrol in a Diesel Car in Clifton
Provided it has not been started, worry far less than you probably are. Until the ignition primes your pump, your starter turns, or your vehicle is driven, petrol in a diesel tank just sits there and does nothing. Which means the truthful reply to the first Clifton question — "have I ruined it?" — normally no. Leave the motor off then ring Petrol in Diesel — that is how you keep it that way. Further down, 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 a second time.
What petrol in a diesel does to your engine
Diesel does two jobs on its way through a motor. Before it burns, it protects — then it combusts. Your high-pressure pump and your injectors are designed to very fine clearances, and the diesel passing through them is what stops those surfaces from grinding against each other.
Of these two jobs, petrol handles the first badly and the second not at all. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, leaving a pump running on the blend wearing itself. It is equally made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the clattering.
The shape of the trouble is clear when you put those together. The harm is done by circulation, not by contact. Where the 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 beginning of a mechanical one, and whatever a worn pump sheds moves on with the fuel to the injectors further on.
Clifton, petrol in a diesel: four situations, from mild to significant
Filled but never started — as good as it gets. Just the tank has petrol in it, and so the job is emptying that tank and rinsing the system where your car sits. This scenario can only truly happen at a forecourt: anywhere else, the vehicle got there by being driven.
A brief spell of running, or just your ignition on. Petrol has left that tank and got to your filter and the fuel lines, since the fuel system has been bled. Drain, flush, deal with the filter: still usually easy.
Your pump now spent a couple of miles on weakened fuel — that's what driving the car meant. Mileage is only half of it; how hard it was driven counts just as much. Either way the work runs to the tank, the lines, your filter and clean fuel through the entire system. On the school run to Clifton Primary School, the distance is small. Getting as far as Carlisle, under 25 miles away, makes a very different task — as does any mileage on the M6, under a mile from Clifton, with your engine running hard the whole time.
Driven on till it protested — clattering, smoke, a ragged idle, a soft throttle. The motor is telling you the fuel is no longer behaving like diesel. Leave it wherever it stops: a lay-by, a quiet street, the verge on Fairview Close. A vehicle stopped quickly very rarely has permanent damage, because the fuel drain and the flush-through, which still go first, sort it out.
What Clifton motorists 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." Topping up removes nothing; it gives you a bigger tank of the same mixture. The idea behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong.
Not so: a modern diesel copes with a bit of petrol. If anything, the opposite. Protection counts more on current diesels, not less, since their fuel runs through finer components at higher pressure.
One myth that catches drivers out: if it starts and drives, it must be unharmed. A petrol motor fed diesel generally won't run, so the motorist stops and the harm stops with them. Feed petrol to a diesel and it normally fires up, idles and pulls away as if nothing has happened — all the while its pump is wearing. Being able to run is not proof of being fine.
Myth: a two-stroke additive lets you to drive home. It was an old workaround, supposed for another fault. The petrol is still inside your tank after that, and what it has thinned isn't put back.
Myth: "Drain your tank yourself and you're sorted." Once the motor has run, some of the petrol is no longer inside your tank: it's in the filter and the fuel lines, and it goes right back through the pump at your next start. It's also really dangerous to drain petrol into a can at the roadside.
Petrol in a diesel: how does it take place?
No one does it on purpose, and it's rarely carelessness. The petrol nozzle is the narrower of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol motor at all. The forecourt makes it simple, and the error runs one way.
Routine and your car falling out of step is how it takes place. Courtesy car, hire car, or a vehicle that's new. Two motors on one driveway, one petrol, one diesel. Your normal forecourt, its pumps suddenly in a different order. Filling up in a hurry en route to Penrith, with a train to catch. The first fill-up in a diesel Renault Clio after years of driving petrol is precisely the moment it happens. Add a back seat full of children, a phone call or rain, and habit wins.
Avoiding petrol in a diesel next time you fill up in Clifton
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most generally do. Check the pump's label; the colour is just a hint.
- Plenty of vehicles state the fuel inside the filler flap or on the cap, so check it on your first fill in a motor you do not know.
- Label your key. In a house with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- "Diesel", aloud, before you lift the nozzle — each time a new or hired car gets its first tank. It seems daft. It does the trick.
- Put your phone away. This is an easy mistake to make while you're thinking about something else.
- Add-on devices are available for motors without one, and some diesels come with a filler that won't accept a petrol nozzle. Useful — but a backstop only, never a reason to stop checking the label.
- Less petrol means a thinner mixture, and so stop the moment you realise — while remembering that the next step is unchanged. It is still not to fire it up.
Already put petrol in a diesel in Clifton?
In that case, there is only a short order of things. Do not fire it up, and don't turn your ignition on. Ask the attendants to help you push it away from the petrol pump if you're still on the forecourt, whether that is Esso or somewhere else. Phone 0333 366 0103 next, with three facts — the fuel, the rough amount, and if it's run.
If it was AdBlue rather than petrol, say so. That's a different issue — corrosion and deposits instead of lost protection — and it has its own page for Clifton.
Why one petrol in a diesel job around Clifton costs more than another
The four scenarios above are four separate jobs, so no single price for this would be honest. What shifts your cost is chiefly which of them you are in. The ratio counts next, meaning how much of your tank is petrol, followed by the location of your car and whether getting to it is safe for a van.
Ahead of any quote, not after, we ask three queries: the fuel that got in, its amount, and if it has run. That's why. Those replies are what turn a range into one firm number.
About Clifton, briefly
Clifton is a small village in Cumbria, situated on the riverside at an elevation of 169 metres. Clifton lies near the villages of Clifton Dykes, Brougham, and Melkinthorpe, and is approximately 19.8 miles from the city of Carlisle. Clifton has a population of around 502 people, predominantly living in detached houses. Clifton is located in the North West region of England, about 241.3 miles from London.
Fuel drain cover in Clifton and across Cumbria
Clifton Dykes, Brougham and Melkinthorpe are among the places near Clifton that the same teams work, answering petrol in diesel call-outs across Clifton's CA postcode area. We drain where the car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the pump around Clifton?
Then, you couldn't be in a better place. Leave it switched off, then ring.