How Worried Should You Be? Petrol in a Diesel Car in Yett
If it hasn't been started, you can worry far less than you likely are. Till the ignition primes your pump, your starter cranks, or your vehicle is driven, petrol in a diesel tank simply sits there and does no harm. Which makes the honest reply to the first Yett query — "have I ruined it?" — normally no. Petrol in Diesel is who to phone, with your motor left off, and so it stays that way. The remainder of this page sets out what petrol really does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you again.
What petrol in a diesel does to your engine
Diesel has two jobs on its way through an engine. It protects first, and after that does it burn. The high-pressure pump and the fuel injectors are made to very fine clearances, and your diesel passing through them is what stops those surfaces from wearing against one another.
Badly at the first, not at all at the second: that's petrol. The clattering comes from petrol being designed not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips out the lubrication the fuel system rests on, and any pump running on that mix is wearing itself.
Taken together, they make clear what shape the issue takes. It's circulation that causes the harm, not contact. A tank with petrol in it is a fuel fault. Once your pump has been running on that petrol, a mechanical issue has started: anything shed by a pump that's wearing down travels onward to the fuel injectors with the fuel.
Yett, petrol in a diesel: four cases, from mild to significant
Fuelled but not once started — the best it gets. Being at a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With the petrol held in that tank alone, it is cleared and rinsed on the spot, and nothing more is needed.
Started for a moment, or just your ignition on. Petrol has come out of the tank and reached the filter and the fuel lines, since the fuel system has been bled. Drain, flush, see to your filter: still usually straightforward.
Driven a few miles. Now your pump has spent these miles running on weakened fuel. Tank, lines, filter, then fresh fuel run through the whole system: that's the work, and the way your car was driven matters as much as the mileage. Driving the children to the local primary school is one kind of trip. Very different a second time: a run to Glasgow, under 15 miles away, or any mileage on the M8, under 3 miles from Yett, where the motor kept working hard.
Clattering, a lumpy idle, smoke, a throttle gone soft: driven till it complained. The motor is telling you your fuel is no longer acting like diesel. Whether it's the verge on Glenmore Road, a lay-by or a side road, stop there and leave it. What goes first is still the drain and flush-through, and that deals with it, with long-term damage very uncommon when a vehicle is pulled over early.
Petrol in a diesel stories Yett people hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. A bigger tank of the same mix is all you get, since topping up removes nothing. The assumption behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." A modern diesel runs its fuel through smaller parts at higher pressure, which makes the protection matter more, not less.
One myth that catches motorists off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it usually will not run, so the motorist stops — and the harm stops with them. A diesel fed petrol usually starts, ticks over and drives away as if nothing has happened, while your pump grinds. Being able to run is not the same as being fine.
Myth: "Add some two-stroke oil and drive it home." It's an outdated fix for a separate issue. None of what petrol diluted gets put back by it — and afterwards, your tank still contains the petrol.
"Drain it yourself and you are sorted" — a myth, since after it's been running some petrol sits in the filter and lines, waiting to go right back through the pump at your next start. Clearing petrol into a can by the kerbside is also really risky.
How does petrol in a diesel occur?
It is rarely carelessness, and nobody does it on purpose. One way only, because of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol car. That's how the forecourt makes it straightforward.
It happens when routine and the car stop matching. Hire cars, courtesy cars, and cars that are new to you. Households running one of each, petrol and diesel. A familiar forecourt with the pumps in a different order. Filling up in a hurry on the way to Carfin, with a train to catch. Exactly the moment it takes place: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Throw in a back seat full of children, a phone call or rain, and habit wins.
Next time you fill up in Yett: preventing petrol in a diesel
- The label is what counts, and so check the pump rather than the colour: in the UK unleaded handles are usually green and diesel black, but not on each forecourt.
- In a vehicle you don't know, look inside the flap over your filler or at the cap before your first fill: many vehicles state the fuel type there.
- One of each in the home? Mark your key to your diesel — a bright fob, a sticker — since intending to remember is not enough.
- "Diesel", aloud, before you pick up the nozzle — each time a new or hired car needs its first tank. It sounds daft. It does the trick.
- While you are thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to reject a petrol nozzle, and add-on devices are available for the remainder. Treat it as a safety net, then keep reading the petrol pump.
- As soon as you realise, stop: less petrol inside your tank makes a thinner blend. What to do next does not change, though — still do not fire it up.
Put petrol in a diesel around Yett already?
Short and simple, then, is the order of things. Do not switch your ignition on, and do not crank it. The staff at the forecourt — whether at JET itself or wherever you filled up — will usually help roll it clear of the petrol pump if you ask. Then call 0333 366 0103 and tell us what went in, roughly how much, and if it has run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a separate problem — Yett has a page all for it.
One petrol in a diesel job in Yett costs more than another. Why?
The four scenarios above are four different tasks, so no single price for this would be fair. What shifts your cost is mostly which of them you're in. The proportion 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 our van.
Before any quote, not after, come three queries: your fuel that went in, its volume, and if it's run. That is why. A range turns into a straight figure when those answers are in.
About Yett, briefly
Yett is a riverside locality in North Lanarkshire, situated near the cities of Glasgow and the surrounding towns of Carfin, New Stevenston, and Newarthill. Yett has a population of around 2952 people and is characterised by its predominantly terraced housing. Yett sits at an elevation of 120 metres, close to the River Clyde and its tributaries, and is located approximately 11 miles from Glasgow city centre.
Fuel drain cover around Yett and across North Lanarkshire
Yett rests in the ML postcode area, and our vans that answer petrol in diesel calls there work the spots near it as well — Carfin, New Stevenston and Newarthill among them. 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 Yett and still at the pump?
Nothing beats it: that's where you now are. Turned off it remains; then call.