How Worried Should You Be? Petrol in a Diesel Car in South Bank
Far less than you probably are, provided it hasn't been started. "Have I ruined it?" is the first thing everyone around South Bank asks, and the truthful answer is generally no, because petrol resting in a diesel tank harms nothing till it is dragged through your fuel system — by ignition priming, by the starter, or by driving. To keep the car like that, phone Petrol in Diesel and leave your engine switched off. What petrol actually does to a diesel, how to gauge how far it's travelled, and how to keep it from happening again: that is the rest of this page.
Inside your engine: what petrol in a diesel does
Passing through an engine, diesel does two things at the same time. It burns, and before it burns it lubricates. Your high-pressure pump and your injectors are built to extremely fine clearances, and the diesel passing through them is what stops those surfaces from grinding against each other.
Petrol does the first job poorly and the second not at all. Being less viscous than diesel, petrol strips away the protection a fuel system needs, leaving a pump on that mixture to wear itself. It is equally made to resist igniting under compression — the opposite of what a diesel needs — which is where you hear the rattling.
The shape of the problem is clear when you put those together. Contact doesn't do the harm — movement does. All a tank with petrol in it amounts to is a fuel fault. A pump that has been running on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with the fuel to your injectors further on.
Four situations our technicians see in South Bank: how serious is petrol in a diesel?
Filled up, and never started: nothing beats it. That petrol is in the tank and just your tank, and the task is a drain and a flush where your car stands. This is the one situation that can only really happen at a forecourt, because anywhere else the vehicle has been driven to get there.
Ignition on, or started for a second. With the fuel system primed, the fuel lines and filter now hold petrol that has come from the tank. That is usually still a straightforward task — a drain, a flush, and the filter dealt with.
The pump has worked a couple of miles on weakened fuel — that's what driving the car meant. How hard the car was driven matters as much as how far, and this work takes in the tank, your lines, the fuel filter and clean fuel through the whole system. The school run to South Bank Community Primary School is one matter. Very different a second time: a run to Durham, under 25 miles away, or any miles on the A1(M), under 15 miles from South Bank, where the engine kept labouring hard.
It protested, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone lumpy. The engine is telling you your fuel is no longer behaving like diesel. Stop wherever you are — the verge on Redcar Road, a lay-by, a side street — and leave it where it is. A car stopped soon very seldom has long-term damage, since the drain and the flush-through, which still go first, take care of it.
Stories South Bank people 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." A fuller tank of the same mix is all you get, because topping up removes nothing. Percentage is not how a diesel fuel system tolerates petrol, however much that guidance assumes.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. More precise parts 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, and so there is no harm" — the myth that trips up more drivers than any other. Diesel in a petrol motor usually means a motor that won't run: the motorist stops, and so does the damage. A diesel fed petrol normally starts, ticks over and drives away as if nothing has happened, while the pump grinds. Being able to run is not proof of being fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an old fix for a different problem. None of what petrol weakened is put back by it — and later, that tank still contains that petrol.
Myth: "Drain that tank yourself and you are sorted." After the motor has been run, some of that petrol is no longer in the tank: it is in the filter and the fuel lines, and it goes straight back through your pump on your next start. Besides, petrol cleared into a can by the road is truly risky.
How petrol ends up: petrol in a diesel
A careless moment is rarely the cause, and no one means to do it. One way only, since of the nozzles: the narrower petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol motor. That is how the forecourt makes it straightforward.
When habit and the car stop matching, it occurs. A new car, a hire car or a courtesy car. One petrol and one diesel on the drive of the same household. The pumps in a different order on a well-known forecourt. A hurried fill on the way to the nearest station with a train to catch. Precisely the moment it happens: after years of driving petrol, a driver fills a diesel Skoda Octavia for the first time. Your hand does what it has always done when you add rain, a phone call or a back seat full of children.
How to avoid petrol in a diesel on your next fill-up in South Bank
- The label is what matters, and so read the petrol pump instead of the colour: in the UK unleaded handles are normally green and diesel black, but not on every forecourt.
- Check your filler flap. Plenty of cars state the fuel inside the flap or on the cap. Look at it on your first fill in any vehicle you do not know.
- Good intentions count for less than a sticker or a fob in a vivid colour on your diesel's key if a home has one of each. So label it.
- Before the nozzle leaves the pump the first time you fuel a hired or new vehicle, say "diesel" out loud. Silly, yes, yet it does the trick.
- Tuck the phone away. This is an easy mistake to make while you're thinking about something else.
- Some diesels come with a filler designed to reject 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 checking the pump.
- Noticing it halfway? Stop there and then. A thinner mixture follows from less petrol inside the tank, yet the next step stays the same: don't start the vehicle.
Already put petrol in a diesel in South Bank?
Then, there is only a short order of things. Leave it unstarted, with the ignition off too. Ask the staff to help you push it away from the pump if you're still on the forecourt, whether that's Asda or somewhere else. What was put in, about how much, and whether it has run: tell us those when you ring 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a different problem — South Bank has a page all for it.
South Bank petrol in a diesel tasks: why one costs more than another
The four scenarios above are four separate jobs, so no single price for this would be honest. What moves your cost is chiefly which of them you're in. Beyond that it's the proportion — how much petrol went in against how much that tank holds — and after that where the vehicle is and whether our van can get to it safely.
Three questions come first, before quoting, instead of after — what went in, how much, has it run — and that is the reason. A range becomes a straight figure once the replies are in.
About South Bank, briefly
South Bank is a small village in North Yorkshire, situated on the coast near the mouth of the River Tees. South Bank has a population of around 1917 people and is characterized by its predominantly terraced housing. South Bank is located near other local places such as Teesville, Brambles Farm, and Grangetown, and is approximately 21 miles from the city of Durham.
Across North Yorkshire and in South Bank: fuel drain cover
Teesville, Brambles Farm and Grangetown are among the locations around South Bank that the same teams work, answering petrol in diesel calls across South Bank's TS postcode area. The car doesn't need to come to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
South Bank: still at the petrol pump?
Then, you could not be in a better place. Keep it off. Ring.