How Worried Should You Be? Petrol in a Diesel Car in Topcliffe
Less than you probably are, provided it has not been started. Everyone in Topcliffe begins with "have I wrecked it?", and the honest answer is normally no: petrol resting inside that tank of any diesel remains harmless until priming, cranking or driving pulls it into the fuel system. Petrol in Diesel is who to phone, with the motor kept off, so it remains that way. Read on for three things: the effect petrol has inside a diesel engine, the signs of how far it has got, and ways to make sure you don't repeat it.
Inside the motor: what petrol in a diesel does
Diesel has two jobs on its way through a motor. Before it ignites, it lubricates — then it ignites. What stops the surfaces inside the high-pressure fuel pump and your injectors from grinding against one another is the diesel passing through them — they are built to extremely fine gaps.
The second job petrol doesn't do at all, and the first it does badly. Being less viscous than diesel, petrol strips away the lubrication a fuel system needs, so a pump running 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 get the rattling.
Taken together, they make clear the shape the issue takes. Contact doesn't do the damage — movement does. Petrol in a tank is a fuel issue. The beginning of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with the fuel to the injectors downstream.
How bad is petrol in a diesel? Four scenarios our engineers see in Topcliffe
Fuelled, and never started: nothing beats it. At a forecourt, and really only there, the petrol is still confined to the tank — because anywhere else the vehicle was driven to reach it. The job is draining and cleaning on the spot.
A brief spell of running, or merely your ignition on. Once primed, the fuel system has pulled petrol from that tank as far as your filter and the fuel lines. That is generally still a straightforward task — a drain, a flush, and the filter dealt with.
Driven a few miles. Now the pump has spent those miles labouring on diluted fuel. How hard your car was driven matters as much as how far, and this work takes in that tank, your lines, the filter and fresh fuel through the whole circuit. A school run to Seven Hills Primary School is one thing. Very different again: a trip to Leeds, under 5 miles away, or any miles on the M62, under a mile from Topcliffe, where the engine never stopped working hard.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone lumpy. The fuel is not behaving like diesel any more, and your motor is telling you. Stop wherever you are — the verge on Beacon Grove, a lay-by, a side street — and leave it where it is. Permanent damage is very uncommon if a car is pulled over soon, and the fuel drain and flush-through that still go first deal with it.
Myths Topcliffe people hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing comes out when you top up — the tank just carries more of the same blend. The idea behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
"Newer diesels can handle a little petrol" — a myth, and nearer the reverse. At higher pressure, through smaller parts: that's how a current diesel moves its fuel, so the lubrication matters for more, not less.
This is the one that fools motorists. Myth: "If it starts and drives, there is no harm done." The motorist of a petrol engine fed diesel normally has no choice but to stop, since it will not run, and the harm stops with them. Whilst the pump wears, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Fine and running aren't the same at all.
An outdated fix for a separate issue is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." What petrol has thinned remains thinned, and that petrol stays in the tank regardless.
The next start sends petrol back round the pump out of your lines and the filter, where some of that sits once your engine has run. That is why a DIY tank drain doesn't leave you sorted — a myth. Draining petrol into a can at the roadside is also truly dangerous.
Why petrol in a diesel happens at all
Nobody does it on purpose, and it's rarely carelessness. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol vehicle at all. The forecourt makes it simple, and the error runs one way.
The moment routine stops matching the car is the moment it happens. A car that is new to you — a hire car, on loan as a courtesy car, or brand new. One petrol and one diesel on the drive of the same household. A forecourt you know, but with its pumps arranged differently. Fuelling up in a hurry en route to Morley, with a train to catch. Exactly the moment it occurs: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. Add rain, a phone call or a back seat full of kids, and your hand does what it has always done.
Next time you fill up around Topcliffe: preventing petrol in a diesel
- The label is what matters, and so check the petrol pump rather than the colour: in the UK unleaded handles are normally green and diesel black, yet not on every forecourt.
- The first fill in an unfamiliar car is the time to check your filler flap — on it, or on the cap, plenty of vehicles state the fuel they take.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of meaning to remember, for a home with one of each.
- "Diesel", aloud, before you pick up the nozzle — each time a new or hired car needs its first tank. It seems silly. It works.
- Thinking about something else is when this becomes an easy mistake to make, so tuck the phone away and keep your mind on the pump.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to block a petrol nozzle, and aftermarket devices are available for the rest. Treat it as a safety net, then keep checking the pump.
- Spotting it halfway? Stop at once. A weaker mixture results from less petrol inside that tank, yet the next stage stays the same: don't crank it.
Put petrol in a diesel around Topcliffe already?
Short and simple, then, is the order of things. Don't fire it up, and don't switch the ignition on. If you're still on the forecourt — Morrisons or anywhere else — ask the staff to help you push the vehicle clear of the petrol pump. Next, 0333 366 0103. We will ask what got in, roughly how much, and if it has been run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate problem — Topcliffe has a page just for it.
What makes one Topcliffe petrol in a diesel job cost more than the next
An honest single quote does not exist here: four situations, four separate tasks. Mostly, your cost moves with which situation you are in. Where your car is counts too, and whether a technician can safely get to it, after the proportion of petrol to what your tank takes.
Before any quote, not after, we ask three questions: the fuel that got in, the quantity, and whether it has run. That is why. A range becomes a straight figure when the answers are in.
About Topcliffe
Topcliffe is a suburban area in West Yorkshire, situated on the riverside at an elevation of 134 metres, with terraced housing being the predominant type of accommodation. Topcliffe lies approximately 4.6 miles from Leeds, making it a commuter-friendly location, and is surrounded by nearby places such as Burn Knolls and Low Town End. Topcliffe has a population of around 5431 residents, who enjoy the area's proximity to the city while still having a relatively quiet environment. Topcliffe is also relatively far from London, at a distance of 165.9 miles, but is well-connected to the surrounding region.
Across West Yorkshire and in Topcliffe: fuel drain cover
Topcliffe sits in the LS postcode area, and our teams that answer petrol in diesel calls there work the spots near it as well — Burn Knolls, Low Town End and Well Hill among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots our engineers drain, and your vehicle doesn't need to move to us.
At the petrol pump in Topcliffe, right now?
The best place there is, then — that is where you are. Switched off it stays; then phone.