Petrol in a Diesel Car in Castlewellan: How Worried Should You Be?
Provided it hasn't been started, worry far less than you likely are. "Have I wrecked it?" is the first thing everyone around Castlewellan asks, and the truthful answer is generally no, since petrol resting in a diesel tank harms nothing until it is drawn through the fuel system — by ignition priming, by your starter, or by being driven. Keep it like that: leave the engine off and ring Petrol in Diesel. 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 really does
On its way through an engine, diesel does two jobs. It lubricates first, and only then does it burn. Extremely fine gaps are built into your injectors and the high-pressure pump, and just the diesel running through stops their surfaces grinding together.
The second job petrol doesn't do at all, and the first it does poorly. It's thinner than diesel and removes the lubrication your fuel system rests on, and so a pump running on a petrol blend is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That's where the rattling comes from.
Together, those make the shape of the trouble plain. The damage is done by circulation, not by contact. All a tank with petrol in it amounts to is a fuel fault. The beginning of a mechanical one is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with the fuel to the fuel injectors beyond it.
How bad is petrol in a diesel? Four situations we see in Castlewellan
Fuelled up, never started. The best case there can be. Being on a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With the petrol kept in that tank alone, it is emptied and rinsed right where it stands, and nothing more is needed.
Started for a second, or just your ignition on. Once primed, your system has pulled petrol from that tank up to your filter and your lines. Drain, flush, see to the filter: still normally straightforward.
Those few miles on the road meant the pump labouring on fuel diluted by petrol throughout. Miles is only half of it; how hard it was driven matters equally. Either way this work includes the tank, your lines, your filter and clean fuel through the entire circuit. The school run to the local primary school is one matter. Very different again: a trip to Lisburn, under 25 miles away, or any miles on the M77, over 50 miles from Castlewellan, where the engine never stopped working hard.
Driven till it complained. Knocking, a lumpy idle, smoke, a throttle that has gone soft. What you are hearing is the engine signalling fuel that no longer behaves like diesel. Whether it's the verge on B7065, a lay-by or a side street, stop where you are then leave it. The drain and flush still come first, and they take care of it: when a vehicle is pulled over soon, lasting damage is very rare.
Myths Castlewellan motorists 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 holds more of the same mixture. Percentage is not how a diesel fuel system copes with petrol, whatever that guidance assumes.
Not so: a modern diesel copes with a bit of petrol. Rather, the opposite. Lubrication counts more on newer diesels, not less, because their fuel runs through finer components at higher pressure.
This is the one that catches drivers. Myth: "If it starts and drives, there is no damage done." Feed diesel to a petrol engine and it generally will not run, and so the motorist stops — and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump grinds. Being able to run isn't the same as being fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It's an outdated fix for a separate 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 the fuel lines and your filter, where some of that sits after the motor has been run. That's why draining the tank yourself does not sort it — a myth. On top of that, petrol drained into a can by the road is genuinely risky.
Why petrol in a diesel takes place at all
Nobody does it on purpose, and it's rarely carelessness. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol vehicle at all. The forecourt makes it easy, and the error runs one way.
When habit and the vehicle stop matching, it occurs. Any motor that's new to you — hired, on loan as a courtesy car, or brand new. Two motors on one driveway, one petrol, one diesel. The pumps in a different order on a familiar forecourt. Fuelling up in a rush on the way to the nearest station, with a train to catch. A new-to-you diesel Skoda Octavia, its first fuelling, and a motorist accustomed to petrol: exactly when it occurs. Add a back seat full of kids, a phone call or rain, and the hand takes over.
Castlewellan drivers: how to avoid petrol in a diesel next time
- The label is what matters, and so check the pump instead of the colour: in the UK unleaded handles are normally green and diesel black, but not on every forecourt.
- Inspect the filler flap. Many cars state the fuel type inside the flap or on the cap. Look at it on your first fill in a car you don't know.
- Mark your key. In a household with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump. It sounds daft and it works.
- Mistakes like this are simple to make while your mind is on something else, so your phone goes away.
- Add-on devices are available for cars without one, and some diesels come with a filler that will not take a petrol nozzle. Helpful — but a backstop at best, never a reason to stop checking the label.
- Stop as soon as you realise. Less petrol inside the tank makes a weaker mixture. It does not change what to do next, which is still not to crank it.
Already put petrol in a diesel around Castlewellan?
Then the order of things is brief. Starting it is out, and so is switching on the ignition. Yet on the forecourt, at the nearest petrol station or anywhere else? Ask the staff to help you roll the car clear of the pump. Then call 0333 366 0103 and tell us what went in, about how much, and if it has run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate problem — Castlewellan has a page all for it.
What makes one Castlewellan petrol in a diesel job cost more than the next
An honest single price doesn't exist here: four situations, four separate tasks. Which of them you're in is chiefly what moves the cost. After that it's the ratio — how much petrol got in against how much your tank holds — and after that where the car is and whether a technician can reach it safely.
Three questions come first, before quoting, instead of after — what went in, how much, has it run — and that is the reason. With those answers, you get a straight figure rather than a range.
About Castlewellan itself
Castlewellan is a small locality in County Down, situated inland at an elevation of 83 metres, and is located near the towns of Annsborough and Dundrum. Castlewellan has a population of around 466 people, and its housing stock is predominantly semi-detached homes. Castlewellan is close to the city of Lisburn, which is approximately 17 miles away, and is about 308 miles from London. Castlewellan sits in a scenic area of Northern Ireland, with the nearby Mourne Mountains and the coastline of Dundrum Bay,
Castlewellan and County Down: where our fuel drain cover reaches
Petrol in diesel calls in Castlewellan — part of the BT postcode area — go to teams that likewise cover the locations about it, Annsborough, Leitrim and Dundrum included. No need to bring the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations where we work.
Castlewellan: still at the petrol pump?
The best place there is, then — that's where you are. Turned off it stays; then call.