How Worried Should You Be? Petrol in a Diesel Car in Morecambe
If it has not been started, you can worry less than you likely are. "Have I ruined it?" is the first thing anyone in Morecambe asks, and the truthful answer is normally no, because petrol resting in a diesel tank harms nothing till it is dragged through the system — by ignition priming, by your starter, or by being driven. Petrol in Diesel is who to ring, with the engine left off, and so it remains that way. Below, you will find what petrol really does inside a diesel, how far it may have got, and how to stop it happening to you a second time.
Your engine and petrol in a diesel: what happens
Passing through a motor, diesel is doing two jobs at the same time. Lubricating comes before burning; it does both. What stops the surfaces inside the high-pressure fuel pump and the injectors from grinding against one another is your diesel flowing through them — they are made to very fine tolerances.
The second job petrol does not do at all, and the first it does badly. Being less viscous than diesel, petrol strips out the protection a fuel system needs, leaving a pump running on the mixture wearing itself. It is also made to resist igniting under compression — the reverse of what a diesel needs — which is why you hear the knocking.
The shape of the problem is plain once you put those together. It is circulation that does the harm, not contact. All a tank with petrol in it amounts to is a fuel fault. After your pump has been working on that petrol, a mechanical problem has begun: whatever is shed by a pump that is grinding travels downstream to your injectors with the fuel.
Petrol in a diesel around Morecambe: how serious is it? Four situations
Fuelled up, never started. The best case there can be. The petrol is in your tank and just the tank, and the job is a drain and a flush where your car sits. This is the one scenario that can only really occur on a forecourt, since anywhere else the vehicle has been driven to get there.
A moment's running, or just your ignition on. Once primed, your system has pulled petrol out of the tank as far as the filter and the fuel lines. Still generally simple: drain, flush, and the filter dealt with.
Some miles driven, and your pump has spent each of them working on thinned fuel. The work is your tank, the fuel lines, the fuel filter and clean fuel through the entire circuit, and how hard your car was driven matters as much as how far. Driving the children to Morecambe Bay Community Primary School is one sort of trip. Getting as far as Lancaster, under 3 miles away, makes a very different task — as does any distance on the Lune Valley Interchange, under 5 miles from Morecambe, with your engine running hard all the way.
Driven on till it protested — rattling, smoke, an uneven idle, a soft throttle. What you are hearing is your motor reporting fuel that no longer runs like diesel. Pull up wherever you are — the verge on Lines Street, a lay-by, a side street — and leave it there. A car pulled over quickly very seldom has lasting damage, as the drain and the flush, which still go first, sort it out.
Petrol in a diesel myths Morecambe drivers hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. A fuller tank of the same mixture is all you get, since topping up takes out nothing. A diesel fuel system does not accept petrol by percentage in the way that advice supposes.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. Finer components and higher pressure are the way a current diesel runs its fuel, and that makes the protection matter more, not less.
Myth: "If it starts and drives, there is no damage done." This is the one that catches motorists. Diesel in a petrol motor generally means a motor that will not run: the motorist stops, and so does the harm. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump wears. Being able to run is not the same as being fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a different issue. The petrol is still in your tank afterwards, and what it has thinned is not put back.
Myth: "Drain your tank yourself and you are sorted." After the motor has been run, some of that petrol is no longer in your tank: it's in the filter and the lines, and it goes straight back through the pump at the next start. Also, a can of petrol drained at the kerbside is truly risky.
Why petrol in a diesel takes place so easily
It's seldom carelessness, and no one does it on purpose. The forecourt makes it simple: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle mostly won't go into a petrol motor at all. So the error runs one way.
Routine and your car getting out of step is when it happens. A new vehicle, a hire car or a courtesy car. A household with one petrol and one diesel on the drive. Your usual forecourt, its pumps now in a different order. Racing for a train at the nearest station and filling up en route. The first fill-up in a diesel Volkswagen Tiguan after years of driving petrol is exactly the moment it happens. Add a back seat full of kids, a phone call or rain, and habit wins.
Preventing petrol in a diesel next time you fill up around Morecambe
- Green for unleaded and black for diesel is usual in the UK — yet not on every forecourt. Trust the label on the pump, not the colour.
- In a car you don't know, look inside the flap over the filler or at the cap before your first fill: plenty of cars print the fuel there.
- Label your 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 intending to remember.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump. It seems daft and it does the trick.
- While you are thinking about something else, this is an easy mistake to make — so put the phone away.
- Add-on devices exist for cars without one, and some diesels are built with a filler that won't accept a petrol nozzle. Useful — but a backstop only, never a reason to stop checking the label.
- Stop the moment you notice. Less petrol inside that tank makes a thinner mixture. It doesn't change what to do next, which is still not to crank it.
Petrol already in a diesel in Morecambe? Start here
Then the order of things is brief. Leave it unstarted, with your ignition switched off too. If you are still on the forecourt — Morrisons or anywhere else — ask the staff to help you push the car away from the pump. Ring 0333 366 0103 next, with three answers — your fuel, the rough quantity, and if it's run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a separate issue — Morecambe has a page just for it.
What makes one Morecambe petrol in a diesel task cost more than the next
The four situations above are four different tasks, so no single quote for this would be fair. Which of them you're in is chiefly what shifts the cost. Where the vehicle is matters too, and whether our van can safely reach it, after the proportion of petrol to what the tank holds.
That's why our technicians ask three questions before costing instead of after: what got in, how much, and whether it has run. With those answers, you get a straight figure instead of a range.
About Morecambe itself
Morecambe is a coastal town in Lancashire, situated on the shores of Morecambe Bay, with a low elevation of around 9 metres above sea level. Morecambe lies close to the city of Lancaster, and its suburbs include areas such as West End and Bare. Morecambe has a mix of housing types, but semi-detached homes are particularly prevalent in the town. Morecambe is located in the North West region of England, approximately 211 miles from London.
Morecambe and Lancashire: where our fuel drain cover reaches
Our vans answering petrol in diesel call-outs around Morecambe, in the LA postcode area, also work the spots near it, West End, White Lund and Bare included. We drain where your car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Morecambe: still at the pump?
The best position there is, then — that is where you are. Switched off it stays; then ring.