How Worried Should You Be? Petrol in a Diesel Car in Low Laithes
If it has not been started, worry far less than you likely are. "Have I ruined it?" is the first thing anyone in Low Laithes asks, and the truthful answer is normally no, because petrol resting in a diesel tank hurts nothing till it is drawn through the fuel system — by ignition priming, by the starter, or by driving. Leave your engine off and ring Petrol in Diesel — that is how you keep it that way. What petrol actually does to a diesel, how to gauge how far it's gone, and how to stop it from happening again: that is the remainder of this page.
Your engine and petrol in a diesel: what goes on
Diesel does two tasks on its way through an engine. It protects to begin with, and only then does it burn. Designed to extremely fine tolerances, the fuel injectors and your pump depend on your diesel moving through them to keep their surfaces from wearing against one another.
The second task petrol doesn't do at all, and the first it does poorly. Being less viscous than diesel, petrol strips away the lubrication a fuel system needs, leaving a pump on that mixture wearing itself. It's also made to resist igniting under compression — the reverse of what a diesel needs — which is why you hear the rattling.
Taken together, they make clear the shape the problem has. The damage is done by movement, not by contact. A tank with petrol in it is a fuel issue. Whatever a worn pump sheds goes on, borne by the fuel, into the fuel injectors further along, which is why a pump that has been working on the petrol is where a mechanical problem begins.
How bad is petrol in a diesel? Four scenarios we see around Low Laithes
Fuelled but not once started — the best it gets. Only that tank has petrol in it, so the task is emptying that tank and flushing the fuel system where your car stands. This scenario can only truly take place on a forecourt: anywhere else, the car got there by being driven.
Ignition on, or started for a moment. Your system has been primed, and so petrol has left that tank and got to the fuel filter and the lines. Usually nothing more than clearing, cleaning and sorting the filter, and so still simple.
Driven a few miles. Now the pump has spent these miles working on weakened fuel. How hard your car was driven counts as much as how far, and the work takes in that tank, your lines, your filter and fresh fuel through the entire system. Short trips, like the school run to High View Primary Learning Centre, are one thing. Getting as far as Wakefield, under 15 miles away, makes a very different job — as does any distance on the M1, under 3 miles from Low Laithes, with the motor labouring hard all the way.
Driven on until it protested — knocking, smoke, a ragged idle, a dead throttle. What you are hearing is the engine signalling fuel that no longer runs like diesel. Leave it where it stops: a lay-by, a side street, the verge on Aldham Crescent. What goes first is still the fuel drain and flush, and that sorts it out, with permanent damage very uncommon when a car is stopped soon.
What Low Laithes drivers get told about petrol in a diesel — and the stories in it
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing is removed when you top up — your tank just holds more of the same blend. A diesel fuel system does not tolerate petrol by percentage in the way that guidance presumes.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through more precise components: that's how a newer diesel handles its fuel, so the lubrication matters more, not less.
This is the one that fools people. Myth: "If it starts and drives, there's no damage done." A petrol motor fed diesel normally won't run, and so the driver stops and the harm stops with them. Whilst your pump grinds, a diesel fed petrol normally starts, ticks over and drives away as though nothing has happened. A running engine doesn't mean fine.
Myth: "Add some two-stroke oil and drive it home." It is an outdated fix for a different issue. It does not put back what petrol has thinned, and that petrol is still in that tank later.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol lies in the fuel filter and lines, ready to go straight back through the pump on your next start. It's also truly risky to drain petrol into a can at the roadside.
Why petrol in a diesel occurs at all
It's rarely carelessness, and no one does it on purpose. The forecourt makes it simple: the petrol nozzle is the smaller of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle generally won't go into a petrol motor at all. So the mistake runs one way.
It takes place when routine and your car stop matching. A new motor, a hire car or a courtesy car. Two vehicles on one driveway, one petrol, one diesel. The pumps in a different order on a familiar forecourt. Fuelling up in a hurry on the way to Wombwell, with a train to catch. Years of petrol cars behind you, a diesel Renault Clio in front of you on the forecourt for its first tank — that is when. With rain, a call arriving, or children to deal with, the hand simply does what it has always done.
Low Laithes motorists: how to prevent petrol in a diesel next time
- Check the petrol 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.
- Inspect the filler flap. Many cars state the fuel inside the flap or on the cap. Look at it on the first fill in a vehicle you do not know.
- Mark the key. In a household with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- "Diesel", aloud, before you pick up the nozzle — each time a new or hired car needs its first tank. It seems silly. It does the trick.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away and keep your mind on the petrol pump.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to reject a petrol nozzle, and aftermarket devices exist for the rest. Treat it as a backstop, and keep reading the pump.
- As soon as you notice, stop: less petrol in the tank makes a thinner blend. What to do next does not change, though — still do not start the vehicle.
Petrol already in a diesel in Low Laithes? Start here
The order of things is short, then. Starting it is out, and so is turning on your ignition. The staff on the forecourt — whether at BP itself or wherever you filled up — will usually help roll it clear of the petrol pump if you ask. What got in, about how much, and whether it has run: tell us those when you ring 0333 366 0103.
If it was AdBlue rather than petrol, say so. That is a separate issue — corrosion and deposits and not lost lubrication — and it has its own page for Low Laithes.
What makes one Low Laithes petrol in a diesel job cost more than the next
A fair single quote does not 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 a van can safely get to it, after the proportion of petrol to what your tank holds.
Three queries come first, before quoting, instead of after — what went in, how much, has it run — and this is the reason. A range becomes a straight figure when the replies are in.
About Low Laithes
Low Laithes is a locality situated on the riverside in South Yorkshire, with an elevation of around 40 metres. Low Laithes lies near the cities of Wakefield and Barnsley, and is close to the nearby places of Smithley, Swaithe, and Ardsley. Low Laithes has a population of approximately 1059 people, and its predominant housing stock consists of semi-detached homes. Low Laithes is located about 150 miles north of London, in the Yorkshire and the Humber region.
Fuel drain cover in Low Laithes and across South Yorkshire
Our teams answering petrol in diesel call-outs in Low Laithes, in the S postcode area, also work the spots around it, Smithley, Swaithe and Ardsley among them. Our engineers drain wherever your car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Still at the pump around Low Laithes?
The best position there is, then — that is where you are. Leave the vehicle turned off, and ring.