Nether Heage: Petrol in a Diesel Car? How Worried to Be
Less than you probably are, provided it has not been started. Until your ignition primes your pump, your starter turns, or your vehicle is driven, petrol in a diesel tank just waits there and does no harm. Which makes the truthful reply to that first Nether Heage query — "have I ruined it?" — normally no. Petrol in Diesel is who to ring, with the motor kept off, and so it remains that way. Further down, you will find what petrol really does inside a diesel, how far it may have gone, and how to stop it happening to you again.
Inside your engine: what petrol in a diesel really does
On its way through a motor, diesel has two jobs. Oiling comes before burning; it does both. Built to extremely fine gaps, the injectors and the pump rely on your diesel flowing through them to keep their surfaces from wearing against one another.
Of these two jobs, petrol handles the first badly and the second not at all. Being less viscous than diesel, petrol strips away the protection a fuel system needs, so a pump running on the blend wearing itself. It is equally made to resist igniting under compression — the opposite of what a diesel needs — which is why you get the knocking.
Put those together and the shape of the trouble is clear. Contact does not do the damage — movement does. All a tank with petrol in it amounts to is a fuel issue. A pump that has been running on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with your fuel to your injectors downstream.
Nether Heage, petrol in a diesel: four cases, from mild to major
Fuelled, and not started: no case is better. Only the tank has petrol in it, so the job is clearing the tank and rinsing your system where your car sits. This situation can only truly happen at a forecourt: anywhere else, the car got there by being driven.
Your ignition switched on, or a brief start. Once primed, the system has drawn petrol from that tank up to the fuel filter and the lines. Drain, flush, see to your filter: still usually easy.
Those few miles driven were your pump working on fuel weakened by petrol throughout. How hard the vehicle was driven counts as much as how far, and this work takes in that tank, the lines, the fuel filter and clean fuel through the whole system. A school run to Heage Primary School is one thing. Driving as far as Derby, under 10 miles away, makes a very different task — as does any mileage on the M1, under 10 miles from Nether Heage, with the motor running hard the whole time.
Driven until it protested. Rattling, an uneven idle, smoke, a throttle that has gone soft. The fuel is not behaving like diesel any more, and the motor is saying so. Whether it's the verge on Malthouse Lane, a lay-by or a side street, stop where you are then leave it. What comes first is still the drain and flush, and that deals with it, with permanent damage very unusual when a car is stopped quickly.
What Nether Heage drivers get told about petrol in a diesel — and the myths in it
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. A bigger tank of the same mixture is all it gives, because topping up removes nothing. A diesel fuel system doesn't tolerate petrol by percentage in the way that advice presumes.
If anything, the reverse holds. Myth: "A current diesel can cope with a bit of petrol." Lubrication counts more on newer diesels, not less, since their fuel runs through more precise parts at higher pressure.
One myth that catches motorists off guard: if it starts and drives, it must be unharmed. The motorist of a petrol engine fed diesel normally stops, because it will not run, and the harm stops with them. Whilst your pump wears, a diesel fed petrol usually starts, idles and drives away as though nothing has happened. Running is not the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a separate issue. None of what petrol weakened is put back by it — and afterwards, your tank still holds that petrol.
Myth: "Drain your tank yourself and you are sorted." After your engine has been run, some of the petrol is no longer in your tank: it's in the fuel filter and your lines, and it goes right back through the pump on the next start. And, a can of petrol drained by the kerbside is genuinely dangerous.
How it happens: petrol in a diesel
No one does it on purpose, and it is seldom carelessness. One way only, because of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, while the diesel one generally won't fit a petrol car. That is how the forecourt makes it straightforward.
When habit and the car stop matching, it takes place. A car that is new to you — a hire car, on loan as a courtesy car, or just bought. Two cars on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A train to catch, and a rushed fill on the way to Ambergate. Years of petrol cars behind you, a diesel Renault Megane in front of you at the forecourt for its first tank — that is when. Add a back seat full of children, a phone call or rain, and the hand takes over.
Avoiding petrol in a diesel next time you fill up around Nether Heage
- 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 only a clue.
- Check your filler flap. Plenty of motors state the fuel inside the flap or on the cap. Look at it on the first fill in any vehicle you don't know.
- Good intentions do less than a sticker or a fob in a vivid colour on the diesel's key when a home has one of each. So label it.
- "Diesel", aloud, before you pick up the nozzle — each time a new or hired car gets its first tank. It sounds daft. It works.
- While you're thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Some diesels come with a filler built to refuse a petrol nozzle, and devices you can add exist for cars without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop checking the petrol pump.
- Stop as soon as you realise. Less petrol inside your tank makes a thinner blend. It does not change what to do next, which is still not to fire it up.
Already put petrol in a diesel in Nether Heage?
In that case, there's just a short order of things. Never start the vehicle, and do not turn the ignition on. Still on the forecourt, at Essar or anywhere else? Ask the staff to help you roll the vehicle clear of the pump. Call 0333 366 0103 next, with three facts — the fuel, the rough amount, and if it has run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a separate fault — Nether Heage has a page all for it.
Why one petrol in a diesel task in Nether Heage costs more than another
Four separate tasks lie behind the four scenarios above — which is why there's no honest single price. Which of them you're in is chiefly what shifts your cost. Beyond that it's the ratio — how much petrol got in against how much the tank takes — and after that where the car is and whether a technician can reach it safely.
That's why our technicians ask three questions before quoting instead of after: what was put in, how much, and whether it has run. Those replies are what turn a range into one firm number.
About Nether Heage itself
Nether Heage is a village in Derbyshire, situated on the banks of the River Derwent at an elevation of 114 metres. Nether Heage lies approximately 8.9 miles from Derby and 120.8 miles from London, with nearby villages including Ridgeway, Toadmoor, and Heage. Nether Heage has a population of around 601 people and is characterised by predominantly detached housing.
Across Derbyshire and around Nether Heage: fuel drain cover
Ridgeway, Toadmoor and Heage are among the spots around Nether Heage that the same vans work, answering petrol in diesel jobs across Nether Heage's DE postcode area. The vehicle doesn't need to move to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
In Nether Heage and still at the petrol pump?
Then you are in the best place there can be. Ring, and leave it switched off.