Should You Worry? Petrol in a Diesel Car in Barrow-in-Furness
Likely less than you already are — as long as no one has started it. Everyone in Barrow-in-Furness starts with "have I wrecked it?", and the honest answer is generally no: petrol resting inside the tank of any diesel remains harmless until priming, cranking or driving pulls it into your fuel system. Petrol in Diesel is who to ring, with the motor left off, so it remains that way. Read on for three things: the effect petrol has inside a diesel engine, the clues of how far it has got, and ways to make sure you don't repeat it.
What petrol in a diesel does to the engine
On its way through a motor, diesel has two jobs. Before it ignites, it lubricates — then it burns. What stops the surfaces inside the high-pressure pump and your injectors from wearing down against one another is your diesel passing through them — they are built to very fine clearances.
The second task petrol does not 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 the blend wearing itself. It is also made to resist igniting under compression — the opposite of what a diesel needs — which is why you get the rattling.
The shape of the problem is clear when you put those together. Not contact but circulation is what does the damage. All a tank with petrol in it amounts to is a fuel issue. Once your pump has been running on that petrol, a mechanical problem has begun: anything shed by a pump that's wearing travels downstream to the fuel injectors with the fuel.
How bad is petrol in a diesel? Four situations we see around Barrow-in-Furness
Fuelled but never started — as good as it gets. Being at a forecourt is what makes this the case: elsewhere, your car has been driven there to begin with. With the petrol kept inside your tank alone, it is drained and cleaned on the spot, and nothing more is needed.
Started for a moment, or only your ignition on. The fuel system has been bled, so petrol has left that tank and reached the filter and the lines. Normally little more than draining, rinsing and seeing to your filter, and so still simple.
Those few miles on the road meant the pump working on fuel diluted by petrol throughout. The work is that tank, your lines, your filter and clean fuel through the entire system, and how hard your car was driven counts as much as how far. The school run to Greengate Junior School is one thing. Any mileage on the M6, under 25 miles from Barrow-in-Furness, means the motor has worked hard throughout, and a run to Lancaster, under 25 miles away, makes a very different job as well.
Rattling, a lumpy idle, smoke, a throttle gone soft: driven till it complained. What you are hearing is the motor signalling fuel that no longer runs like diesel. Stop on the spot — on the verge on Market Street, at the kerb, down a side road — and don't move it. The drain and flush-through still come first, and they deal with it: when a car is stopped quickly, lasting damage is very uncommon.
Myths Barrow-in-Furness motorists hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Topping up removes nothing; it gives you a bigger tank of the same mixture. That advice presumes a diesel fuel system tolerates petrol by percentage. It does not.
If anything, the opposite is true. Myth: "A modern diesel can cope with a bit of petrol." Smaller parts and higher pressure are the way a newer diesel runs its fuel, and that makes the protection count more, not less.
This is the one that catches drivers. Myth: "If it starts and drives, there's no damage done." The driver of a petrol engine fed diesel usually has no choice but to stop, since it will not run, and the damage stops with them. While your pump grinds, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Running isn't the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a different issue. That petrol is still in your tank afterwards, and whatever it has weakened is not put back.
The next start draws petrol back round the pump from the lines and the filter, where some of that sits after the engine has been run. That's why a DIY tank drain doesn't leave you sorted — a myth. And, a can of petrol drained by the roadside is truly risky.
How does petrol in a diesel occur?
On purpose? Never. Through carelessness? Rarely, if ever. The petrol nozzle is the narrower of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol motor at all. The forecourt makes it simple, and the error runs one way.
The moment habit stops matching your car is the moment it happens. Courtesy car, hire car, or a vehicle that is brand new. Two motors on one driveway, one petrol, one diesel. A well-known forecourt with the pumps in a different order. Rushing for a train outside the nearest station and filling up en route. The first fill-up in a diesel Volkswagen Passat after years of driving petrol is exactly the moment it happens. Add a back seat full of children, a phone call or rain, and habit takes over.
Next time you fill up around Barrow-in-Furness: preventing petrol in a diesel
- A green handle for unleaded and black for diesel is usual in the UK — but not on every forecourt. Trust the label on the pump, not the colour.
- The first fill in a new car is the time to check the filler flap — inside it, or on the cap, plenty of motors state the fuel they take.
- One of each in the household? Mark your key to your diesel — a coloured fob, a sticker — because meaning to remember is not enough.
- It sounds silly and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump.
- Mistakes like this are straightforward to make while your mind is on something else, and so the phone goes away.
- Add-on devices exist for cars without one, and some diesels come with a filler that won't take a petrol nozzle. Helpful — but a safety net only, never a reason to stop checking the label.
- Spotting it mid-fill? Stop at once. A thinner mixture follows from less petrol inside the tank, yet the next stage stays the same: do not fire it up.
Petrol already in a diesel around Barrow-in-Furness? Begin here
The order of things is brief, then. Do not switch the ignition on, and do not fire it up. Ask the staff to help you push it away from the pump if you're still at the forecourt, whether that's Morrisons or somewhere else. What was put in, roughly how much, and if it has run: tell us that when you call 0333 366 0103.
Corrosion and deposits form the issue with AdBlue, whereas petrol brings lost lubrication. So if it was AdBlue, say so — and read its own Barrow-in-Furness page.
One petrol in a diesel job around Barrow-in-Furness costs more than another. Why?
Four separate tasks lie behind the four situations above — which is why there's no fair single price. Chiefly, the cost shifts with which one you're in. Beyond that it's the share — how much petrol went in against how much the tank takes — and after that where the vehicle is and whether our van can get to it safely.
Ahead of any quote, not after, we ask three questions: the fuel that went in, its amount, and whether it's run. That's why. A range turns into a straight figure once those replies are in.
About Barrow-in-Furness itself
Barrow-in-Furness is a coastal town in Cumbria, situated on the Furness Peninsula in the North West of England. Barrow-in-Furness has a low elevation of around 19 metres and is located near several nearby places, including Barrow Island, Hindpool, and Vickerstown. Barrow-in-Furness is characterised by its predominantly terraced housing and is approximately 17.7 miles from Lancaster. Barrow-in-Furness is a significant urban centre in the region, with a population of around 21,377 people.
Across Cumbria and in Barrow-in-Furness: fuel drain cover
Barrow Island, Hindpool and Vickerstown are among the locations near Barrow-in-Furness that the same teams work, answering petrol in diesel jobs across Barrow-in-Furness's LA postcode area. You need not bring the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places we drain.
In Barrow-in-Furness and still at the petrol pump?
In that case, you couldn't be in a better place. Keep the vehicle switched off, and ring.