How Worried Should You Be? Petrol in a Diesel Car in Nant-y-Felin
Less than you probably are, if it hasn't been started. Everyone in Nant-y-Felin starts with "have I wrecked it?", and the fair answer is usually no: petrol left in your tank of a diesel remains harmless until priming, cranking or driving pulls it into the fuel system. Leave your engine off and call Petrol in Diesel — that is how you keep it like that. What petrol actually does to a diesel, how to judge how far it's travelled, and how to keep it from happening again: that's the remainder of this page.
Petrol in a diesel: what does it do to the motor?
Two jobs fall to diesel on its route round a motor. Before it combusts, it lubricates — then it burns. Very fine tolerances are built into your injectors and your high-pressure pump, and only your diesel flowing through stops those surfaces grinding together.
Petrol handles the first task poorly and the second not at all. It is runnier than diesel and takes away the lubrication the system rests on, and so a pump running on a petrol mix is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That's where the clattering comes from.
The shape of the trouble is plain once you put those together. Contact doesn't do the damage — movement does. A tank with petrol in it is a fuel issue. Once your pump has been working on that petrol, a mechanical issue has begun: whatever is shed by a pump that's grinding is carried downstream to your injectors with the fuel.
Petrol in a diesel in Nant-y-Felin: how serious is it? Four cases
Filled up, never started. The best case there can be. On a forecourt, and really only there, the petrol is still confined to that tank — since everywhere else your car was driven to reach it. The task is emptying and rinsing on the spot.
Ignition on, or started for a moment. Your system has been primed, and so petrol has left that tank and reached your filter and the fuel lines. That is generally still a simple job — a drain, a flush, and your filter seen to.
A few miles driven, and your pump has spent each of them labouring on weakened fuel. The work is the tank, the lines, the filter and fresh fuel through the entire system, and how hard your car was driven matters as much as how far. Short trips, such as the school run to the local primary school, are one thing. Driving as far as Bangor, under 10 miles away, makes a very different task — as does any mileage on the Moreton Spur, under 50 miles from Nant-y-Felin, with your engine working hard the whole time.
Knocking, an uneven idle, smoke, a throttle gone soft: driven till it complained. The fuel is not behaving like diesel any more, and your engine is saying so. Stop wherever you are — the verge on Llwyn Ysgaw, a lay-by, a side street — and leave the car there. Lasting damage is very uncommon if a vehicle is stopped soon, and the fuel drain and flush-through that still come first sort it out.
Petrol in a diesel stories Nant-y-Felin drivers hear
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 mixture is all it gives, because topping up takes out nothing. The idea behind the guidance — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the reverse. Smaller 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 is no damage done." The motorist of a petrol engine fed diesel usually stops, because it will not run, and the harm stops there. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile the pump wears. Fine and running are not the same thing.
Myth: a two-stroke additive lets you to drive home. It is an old workaround, meant for another fault. None of what petrol diluted gets put back by it — and later, your tank still holds the petrol.
The next start sends petrol back round the pump from your lines and the fuel filter, where some of it ends up once your engine has run. That is why a DIY tank drain does not leave you sorted — a myth. It's also really hazardous to drain petrol into a can by the kerbside.
How does petrol in a diesel occur?
On purpose? Never. Through carelessness? Seldom, if ever. One way only, because of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one generally will not fit a petrol motor. That's how the forecourt makes it straightforward.
Routine and the car falling out of step is how it takes place. Courtesy car, hire car, or a car that's new. Households running one of each, petrol and diesel. The pumps in a different order on a familiar forecourt. Racing for a train outside Llanfairfechan and filling up en route. Years of petrol vehicles behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that is when. Add a back seat full of kids, a phone call or rain, and habit takes over.
How to avoid petrol in a diesel on your next fill-up in Nant-y-Felin
- Read the pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on every forecourt. The label is what counts.
- The first fill in a strange car is the time to check your filler flap — on it, or on the cap, many cars state the fuel they take.
- Mark your key. In a house with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- It seems daft and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Mistakes like this are simple to make while your mind is on something else, so the phone goes away.
- Add-on devices exist for vehicles without one, and some diesels come with a filler that will not accept a petrol nozzle. Helpful — but a safety net at best, never a reason to stop checking the label.
- Noticing it halfway? Stop there and then. A weaker mixture results from less petrol inside that tank, yet your next stage remains the same: don't crank it.
Nant-y-Felin: already put petrol in a diesel?
Short and simple, then, is the order of things. Do not switch your ignition on, and don't crank it. Ask the staff to help you roll it away from the petrol pump if you're still on the forecourt, whether that is Shell or anywhere else. Then ring 0333 366 0103 and tell us what went in, roughly how much, and if it's run.
Say so if it was AdBlue rather than petrol: it's a separate issue, with its own page for Nant-y-Felin, since AdBlue brings corrosion and deposits instead of lost protection.
What makes one Nant-y-Felin petrol in a diesel job cost more than the next
There is no honest single price for this, since the four scenarios above are four different jobs. What moves the cost is mostly which of them you're in. Beyond that it is the ratio — how much petrol got in against how much the tank holds — and after that where your car is and whether our van can get to it safely.
Before any quote, not after, we ask three queries: the fuel that got in, the quantity, and if it's run. That is why. Those replies turn a range into a straight figure.
About Nant-y-Felin itself
Nant-y-Felin is a suburban area in Conwy, situated on the north Welsh coast, with Nant-y-Felin being close to the nearby towns of Llanfairfechan and Bangor. Nant-y-Felin has a population of around 2263 people, with Nant-y-Felin predominantly consisting of semi-detached housing. Nant-y-Felin is located at an elevation of 72 metres, with Nant-y-Felin sitting near the communities of Nant-y-Pandy and Pentre Uchaf.
Across Conwy and in Nant-y-Felin: fuel drain cover
Nant-y-Pandy, Pentre Uchaf and Llanfairfechan are among the places near Nant-y-Felin that the same vans work, answering petrol in diesel call-outs across Nant-y-Felin's LL postcode area. You need not bring your car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots where we work.
Still at the pump in Nant-y-Felin?
Then, you could not be in a better position. Keep it off. Phone.