Should You Worry? Petrol in a Diesel Car in Bowness-on-Windermere
Provided it has not been started, worry far less than you probably are. Till the ignition primes the pump, your starter cranks, or your vehicle is driven, petrol in a diesel tank just waits there and does no harm. Which means the truthful reply to the first Bowness-on-Windermere query — "have I ruined it?" — normally no. To keep the car like that, call Petrol in Diesel then leave your motor switched off. Below, this page sets out what petrol actually does inside a diesel, how far it may have got, and how to stop it happening to you a second time.
Inside the engine: what petrol in a diesel does
On its way through an engine, diesel has two jobs. It ignites, and before it burns it lubricates. The high-pressure fuel pump and your injectors are built to very fine tolerances, and your diesel passing through them is what keeps those surfaces from wearing down against one another.
Of those two jobs, petrol manages the first poorly and the second never. The knocking comes from petrol being designed not to ignite when compressed, which is precisely the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips away the lubrication the system rests on, and any pump working on that mix is wearing itself.
Combined, those make the shape of the problem clear. Not contact but movement is what causes the harm. Petrol in a tank is a fuel fault. The start of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with your fuel to the fuel injectors beyond it.
How bad is petrol in a diesel? Four situations we see in Bowness-on-Windermere
The best case there is: filled up, never started. Being at a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With the petrol kept inside your tank alone, it is drained and rinsed on the spot, and nothing more is needed.
The ignition switched on, or a brief start. Petrol has come out of your tank and got to your filter and the lines, since the system has been primed. Drain, flush, see to the fuel filter: still usually straightforward.
Driven a few miles. Now the pump has spent those miles running on thinned fuel. Tank, lines, filter, then clean fuel run through the whole system: that's this work, and the way the car was driven matters as much as the mileage. On the school run to Goodly Dale Primary School, the distance is small. Driving as far as Lancaster, under 25 miles away, makes a very different task — as does any miles on the M6, under 15 miles from Bowness-on-Windermere, with your engine labouring hard all the way.
Driven till it complained. Clattering, a ragged idle, smoke, a throttle that has gone soft. That's your motor telling you its fuel has stopped acting like diesel. Whether it's the verge on Ash Street, a lay-by or a side road, stop where you are then leave it. A car pulled over early very seldom has long-term damage, as the drain and the flush, which still go first, take care of it.
Bowness-on-Windermere drivers and that petrol in a diesel myths they hear
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. A bigger tank of the same mix is all you get, because topping up takes out nothing. That guidance assumes a diesel fuel system handles petrol by percentage. It does not.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through smaller parts: that's how a modern diesel handles its fuel, so the protection matters more, not less.
One myth that catches people off guard: if it starts and drives, it must be unharmed. The motorist of a petrol motor fed diesel usually stops, since it will not run, and the damage stops there. Feed petrol to a diesel and it normally starts, idles and pulls away like nothing happened — all while its pump wears. Being able to run isn't the same as being fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an old workaround for a separate issue. What petrol has diluted remains thinned, and the petrol remains in your tank regardless.
If the motor has been run, part of the petrol sits in your filter and the lines, not the tank — and the next start sends it right back through the pump. So the myth "drain that tank yourself and you are sorted" does not stand up. Also, a can of petrol filled by the roadside is genuinely hazardous.
Why petrol in a diesel happens at all
On purpose? Never. Through carelessness? Rarely, if ever. The forecourt makes it easy: 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 will not go into a petrol car at all. So the error runs one way.
The moment habit stops matching your car is the moment it takes place. Courtesy car, hire car, or a vehicle that's brand new. Two vehicles on one drive, one petrol, one diesel. Your ordinary forecourt, its pumps now in a different order. A train to catch, and a hurried fill on the way to Windermere. The first fill-up in a diesel Renault Megane after years of driving petrol is precisely the moment it takes place. Throw in rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
Next time you fill up around Bowness-on-Windermere: avoiding petrol in a diesel
- Read the pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on every forecourt. The label is what matters.
- Many motors state the fuel type inside your filler flap or on the cap, so check there on the first fill in a vehicle you don't know.
- One of each in the home? Mark your key to your diesel — a bright fob, a sticker — because meaning to remember isn't enough.
- It sounds daft and it works: on your first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump.
- Thinking about something else is when this becomes an easy mistake to make, and so put the phone away then keep your mind on the pump.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to refuse a petrol nozzle, and add-on devices are available for motors without one. They are a safety net, not a reason to stop reading the pump.
- As soon as you notice, stop: less petrol inside that tank means a weaker mix. What to do next does not change, though — still don't fire it up.
Already put petrol in a diesel in Bowness-on-Windermere?
Short and simple, then, is the order of things. Don't crank it, and don't switch your ignition on. If you are still on the forecourt — Shell or anywhere else — ask the attendants to help you push the car clear of the petrol pump. What got in, about how much, and if it's run: tell us that when you phone 0333 366 0103.
If it was AdBlue rather than petrol, say so. That's a different fault — corrosion and deposits instead of lost lubrication — and it has its own page for Bowness-on-Windermere.
Bowness-on-Windermere petrol in a diesel jobs: why one costs more than another
Four different jobs lie behind the four situations above — which is why there's no honest single quote. Chiefly, the cost moves with which one you are in. Two things follow that: the petrol that got in as a share of what the tank holds, then the place the car is in and whether a technician can reach it safely.
That is why our engineers ask three questions before pricing rather than after: what was put in, how much, and whether it's run. Their replies are what change a range into one firm number.
About Bowness-on-Windermere, for a moment
Bowness-on-Windermere is a town situated on the shores of Windermere, the largest lake in the Lake District, in Cumbria, England. Bowness-on-Windermere sits at an elevation of 56 metres, surrounded by picturesque hills and mountains, and is close to nearby places such as Ferney Green and Heathwaite. Bowness-on-Windermere has a population of approximately 3704 people, predominantly living in detached houses, and is located 22.2 miles from Lancaster and 229.1 miles from London.
Fuel drain cover across Cumbria, Bowness-on-Windermere included
Bowness-on-Windermere sits in the LA postcode area, and our teams that answer petrol in diesel calls there work the locations around it as well — Ferney Green, Heathwaite and Droomer among them. The vehicle doesn't need to come to us: our engineers drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
In Bowness-on-Windermere and still at the pump?
The best place there is, then — that's where you are. Ring, and keep it turned off.