How Worried Should You Be? Petrol in a Diesel Car in Cossington
Less than you probably are, provided it has not been started. Everyone in Cossington begins with "have I wrecked it?", and the fair answer is normally no: petrol left in your tank of any diesel stays harmless till priming, cranking or driving draws it into the system. Petrol in Diesel is who to ring, with your motor left off, so it remains that way. Read on for three things: the effect petrol has inside a diesel engine, the clues of how far it has got, and ways to make sure you don't repeat it.
Inside the motor: what petrol in a diesel really does
On its way through a motor, diesel does two jobs. Before it combusts, it lubricates — then it combusts. Your high-pressure pump and the fuel injectors are made to very fine tolerances, and the diesel passing through them is what keeps those surfaces from grinding against one another.
Of those two tasks, petrol handles the first poorly and the second not at all. It's thinner than diesel and removes the protection your fuel system depends on, and so a pump running on a petrol blend is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the clattering comes from.
The shape of the trouble is plain once you put those together. Contact does not do the damage — circulation does. All a tank with petrol in it amounts to is a fuel problem. Once the pump has been working on that petrol, a mechanical issue has begun: whatever is shed by a pump that is wearing is carried onward to your injectors with your fuel.
Petrol in a diesel around Cossington: how serious is it? Four cases
Fuelled, and never started: no case is better. That petrol is inside that tank and just that tank, and the job is a drain and a flush where the car stands. This is the one scenario that can only really take place on a forecourt, because anywhere else your car has been driven to get there.
Started for a moment, or only the ignition on. Petrol has come out of the tank and reached the filter and the fuel lines, since the system has been bled. That is generally still a simple task — a drain, a flush, and the fuel filter dealt with.
Driven a couple of miles. Now your pump has spent these miles working on weakened fuel. How hard the vehicle was driven matters as much as how far, and this work takes in your tank, your lines, the fuel filter and clean fuel through the entire circuit. Driving the kids to Woolavington Village Primary School is one sort of trip. Any distance on the M5, under 3 miles from Cossington, means your engine working hard throughout, and a run to Wells, under 15 miles away, is a very different job as well.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone lumpy. What you are hearing is the motor reporting fuel that no longer runs like diesel. Stop wherever you are — the verge on Walnut Lane, a lay-by, a side street — and leave it where it is. What comes first is still the fuel drain and flush-through, and that takes care of it, with long-term damage very uncommon when a vehicle is stopped early.
Stories Cossington drivers hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Topping up takes out nothing; it gives you a fuller tank of the same mix. A diesel fuel system doesn't accept petrol by percentage in the way that guidance supposes.
"Current diesels can handle a little petrol" — a myth, and nearer the reverse. A newer diesel runs its fuel through more precise components at higher pressure, which makes the protection count more, not less.
"It starts, it drives, and so no harm done" — the myth that trips up more drivers than any other. Any petrol engine fed diesel normally will not run, and so the driver stops and the harm stops with them. Feed petrol to a diesel and it usually starts, ticks over and drives away like nothing has happened — all while its pump wears. A running engine does not mean fine.
Not so: a two-stroke additive lets you to drive home. It is an old fix, meant for another fault. What petrol has diluted stays diluted, and the petrol stays inside the tank anyway.
The next start draws petrol back round the pump from the fuel lines and your filter, where some of that sits once the engine has been run. That's why a DIY tank drain does not sort it — a myth. Emptying petrol into a can by the roadside is also really dangerous.
Petrol in a diesel: how does it take place?
Nobody does it on purpose, and it is rarely carelessness. A diesel nozzle generally will not go into a petrol car, but the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake straightforward, and only in that direction.
It takes place when routine and the vehicle stop matching. Courtesy car, hire car, or a car that is brand new. Two motors on one drive, one petrol, one diesel. A well-known forecourt with the pumps in a different order. Racing for a train at Bridgwater and filling up en route. The first fill-up in a diesel Renault Megane after years of driving petrol is exactly the moment it happens. Throw in a back seat full of children, a phone call or rain, and the hand takes over.
Next time you fill up in Cossington: avoiding petrol in a diesel
- Green for unleaded and black for diesel is normal in the UK — but not on every forecourt. Trust the label on the pump, not the colour.
- Plenty of cars state the fuel type inside the filler flap or on the cap, so check it on the first fill in a motor you don't know.
- Label the key. In a household 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 pick up the nozzle — each time a new or hired car gets its first tank. It sounds silly. It does the trick.
- Whilst you're thinking about something else, this is an easy mistake to make — so put the phone away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to reject a petrol nozzle, and add-on devices exist for the rest. Treat it as a backstop, and keep reading the petrol pump.
- Noticing it halfway? Stop at once. A thinner mixture results from less petrol in your tank, yet your next stage remains the same: don't crank it.
Put petrol in a diesel around Cossington already?
The order of things is short, then. Leave it unstarted, with your ignition switched off too. Yet on the forecourt, at Murco or anywhere else? Ask the staff to help you roll it away from the pump. Next, 0333 366 0103. We'll ask what got in, about how much, and if it's been run.
Say so if it was AdBlue rather than petrol: it is a separate problem, with its own page for Cossington, because AdBlue brings corrosion and deposits rather than lost lubrication.
Why one petrol in a diesel task in Cossington costs more than another
There is no honest single price for this, because the four scenarios above are four different tasks. What shifts the cost is mostly which of them you are in. Where your car is counts too, and whether a technician can safely get to it, after the share of petrol to what your tank holds.
Before any quote, not after, we ask three questions: the fuel that got in, the amount, and whether it's run. That's why. With those replies, there is a straight figure rather than a range.
About Cossington, for a moment
Cossington is a small village in Somerset, situated inland at an elevation of around 40 metres, with detached housing being the predominant type of accommodation. Cossington lies near the villages of Chilton Polden, Woolavington, and Bawdrip, and is approximately 12 miles from the city of Wells. Cossington has a population of around 641 people and is located about 123 miles west of London. Cossington remains a quiet rural community with a strong sense of local identity.
Fuel drain cover in Cossington and across Somerset
Chilton Polden, Woolavington and Bawdrip are among the locations around Cossington that the same vans work, answering petrol in diesel jobs across Cossington's TA postcode area. The car doesn't need to come to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the petrol pump around Cossington?
The best place there is, then — that is where you are. Switched off it remains; then call.