Should You Worry? Petrol in a Diesel Car in Newstead
Far less than you probably are, provided it hasn't been started. Till the ignition primes your pump, the starter turns, or the car is driven, petrol in a diesel tank just waits there and does no harm. Which makes the truthful reply to that first Newstead query — "have I ruined it?" — usually no. To leave the car like that, call Petrol in Diesel and leave the engine alone. What petrol actually does to a diesel, how to gauge how far it has travelled, and how to stop it from happening again: that's the remainder of this page.
Inside your engine: what petrol in a diesel really does
Two tasks fall to diesel on its route round a motor. Before it burns, it lubricates — and then it burns. Extremely fine gaps go into the fuel injectors and the high-pressure fuel pump, and only the diesel running through keeps their surfaces from grinding together.
The second job petrol doesn't do at all, and the first it does badly. The knocking comes from petrol being designed not to ignite when compressed, which is precisely the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips away the lubrication the system hinges on, and any pump working on that mixture is wearing itself.
The shape of the trouble is plain when you put those together. The damage is done by circulation, not by contact. Where the petrol is only in the tank, it is a problem of fuel, nothing more. The start of a mechanical problem is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with the fuel to the injectors beyond it.
Petrol in a diesel around Newstead: how serious is it? Four cases
The best case there is: filled up, never started. At a forecourt, and genuinely only there, that petrol is still limited to your tank — since everywhere else the vehicle was driven to reach it. The job is draining and flushing on the spot.
The ignition turned on, or a short start. Once primed, the system has pulled petrol from that tank up to the fuel filter and the lines. Still normally easy: drain, flush, and the fuel filter seen to.
Your pump now worked a few miles on weakened fuel — that's what driving the car meant. How hard the car was driven matters as much as how far, and the work covers the tank, the lines, your filter and fresh fuel through the whole circuit. Short trips, such as the school run to Newstead Primary Academy, are one matter. A run as far as Stoke-on-Trent, under 5 miles away, is a very different job. So is any mileage on the M6, under 3 miles from Newstead, where the motor has been labouring hard the whole time.
It protested, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone ragged. The fuel is not acting like diesel any more, and the engine is telling you. Pull up where you are — on the verge on Barlaston Road, at the kerb, down a side road — and don't move it again. The fuel drain and flush still go first, and they sort it out: if a car is stopped quickly, long-term damage is very uncommon.
What Newstead people get told about petrol in a diesel — and the stories in it
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. A bigger tank of the same mix is all you get, because topping up takes out nothing. A diesel fuel system does not accept petrol by percentage in the way that advice supposes.
Not so: a current diesel copes with a bit of petrol. If anything, the opposite. Finer components and higher pressure are how a modern diesel runs its fuel, and that makes the protection matter more, not less.
This is the one that catches drivers. Myth: "If it starts and drives, there's no harm done." Diesel in a petrol motor generally means a motor that will not run: the motorist stops, and so does the damage. Whilst the pump wears, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Fine and running are not the same thing.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an outdated workaround for a different fault. None of what petrol thinned gets put back by it — and afterwards, the tank still holds that petrol.
The next start draws petrol back round your pump from your lines and the filter, where some of it ends up once the motor has been run. That is why draining the tank yourself doesn't sort it — a myth. It's also truly hazardous to drain petrol into a can by the roadside.
How it happens: petrol in a diesel
No one does it on purpose, and it is rarely carelessness. One way only, since of the nozzles: the narrower petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one mostly won't fit a petrol vehicle. That is how the forecourt makes it easy.
It takes place when routine and the car stop matching. Hire cars, courtesy cars, and motors that are new to you. A household with one petrol and one diesel on the driveway. A well-known forecourt with the pumps in a different order. A train to catch, and a hurried fill en route to Wedgwood. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver used to petrol: precisely when it takes place. Add rain, a phone call or a back seat full of kids, and your hand does what it has always done.
Avoiding petrol in a diesel next time you fill up in Newstead
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most generally do. Read the petrol pump's label; the colour is just a hint.
- Check your filler flap. Plenty of vehicles state the fuel inside the flap or on the cap. Look at it on the first fill in any vehicle you do not know.
- One of each in the household? Label your key to your diesel — a coloured fob, a sticker — since intending to remember isn't enough.
- "Diesel", aloud, before you lift the nozzle — each time a new or hired car gets its first tank. It seems daft. It works.
- Mistakes like this are straightforward to make while your mind is on something else, and so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to refuse a petrol nozzle, and add-on devices exist for the remainder. Treat it as a safety net, and keep checking the petrol pump.
- Stop the moment you realise. Less petrol in that tank means a thinner mixture. It doesn't change what to do next, which is still not to crank it.
Petrol already in a diesel in Newstead? Start here
Short and simple, then, is the order of things. Do not switch the ignition on, and do not start it. The staff at the forecourt — whether at BP itself or wherever you filled up — will normally help push it clear of the pump if you ask. What was put in, roughly how much, and whether it's run: tell us that when you phone 0333 366 0103.
Say so if it was AdBlue instead of petrol: it's a different problem, with its own page for Newstead, since AdBlue brings corrosion and deposits rather than lost protection.
One petrol in a diesel task around Newstead costs more than another. Why?
An honest single quote doesn't exist here: four scenarios, four separate jobs. What moves the cost is mostly which of them you're in. Where the car is counts too, and whether our van can safely reach it, after the share of petrol to what your tank holds.
Three queries come first, before any quote, instead of after — what went in, how much, has it run — and that is the reason. With the answers, there is a straight figure rather than a range.
About Newstead itself
Newstead is a suburban area in Staffordshire, situated on the riverside near Stoke-on-Trent. Newstead has a mix of semi-detached housing and is located at an elevation of 137 metres, with nearby places including Blurton, Dresden, and Hem Heath. Newstead is approximately 3.8 miles from Stoke-on-Trent and 132.4 miles from London, making it a commuter-friendly location. Newstead has a population of around 4378 residents.
Fuel drain cover across Staffordshire, Newstead included
Newstead sits in the ST postcode area, and the teams that answer petrol in diesel call-outs there work the places around it as well — Blurton, Dresden and Hem Heath among them. No need to bring your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots we drain.
At the pump in Newstead, still?
In that case, you could not be in a better place. Leave the car switched off, then ring.