How Worried Should You Be? Petrol in a Diesel Car in Brow Edge
Far less than you probably are, provided it hasn't been started. Till your ignition primes your pump, your starter cranks, or your vehicle is driven, petrol in a diesel tank simply sits there and does nothing. Which means the honest reply to that first Brow Edge query — "have I wrecked it?" — usually no. To leave the car like that, ring Petrol in Diesel then leave the motor switched off. What petrol really does to a diesel, how to judge how far it's travelled, and how to stop it from happening again: that's the remainder of this page.
Petrol in a diesel: what does it do to the engine?
On its way through a motor, diesel has two jobs. Before it burns, it protects — then it combusts. Extremely fine clearances go into your injectors and your high-pressure pump, and only the diesel running through keeps those surfaces from grinding together.
Poorly at the first, not at all at the second: that is petrol. It's thinner than diesel and removes the lubrication your fuel system hinges on, so a pump running on a petrol mixture is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That's where the clattering comes from.
Taken together, they make clear the shape the issue takes. The harm is done by circulation, not by contact. A tank with petrol in it is a fuel fault. Once the pump has been labouring on that petrol, a mechanical problem has begun: whatever is shed by a pump that's wearing travels downstream to your injectors with your fuel.
Petrol in a diesel in Brow Edge: how serious is it? Four situations
The best case there can be: filled up, never started. Being on a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With the petrol held inside that tank alone, it's drained and purged on the spot, and nothing more is needed.
A moment's running, or merely your ignition on. With your system primed, your lines and filter already contain petrol that came from the tank. Still generally simple: drain, flush, and your filter dealt with.
Your pump now spent a couple of miles on diluted fuel — that is what driving it meant. Distance is only half of that; how hard it was driven counts equally. Either way the work includes your tank, your lines, the filter and clean fuel through the entire system. A school run to Leven Valley CofE Primary School is one matter. Getting as far as Lancaster, under 25 miles away, makes a very different job — as does any miles on the M6, under 15 miles from Brow Edge, with the engine running hard the whole time.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone uneven. The fuel isn't behaving like diesel any more, and your engine is saying so. Stop wherever you are — the verge on A590, a lay-by, a side street — then leave it where it is. A vehicle pulled over early very rarely has lasting damage, as the drain and the flush, which still come first, take care of it.
What Brow Edge drivers get told about petrol in a diesel — and the myths in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing comes out when you top up — your tank just holds more of the same blend. That guidance supposes a diesel fuel system tolerates petrol by percentage. It does not.
"Current diesels can handle a little petrol" — a myth, and closer to the reverse. A modern diesel sends its fuel through more precise parts at higher pressure, which makes the lubrication count more, not less.
This is the one that catches motorists. Myth: "If it starts and drives, there's no harm done." Feed diesel to a petrol engine and it usually will not run, and so the driver stops — and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile the pump wears. Fine and running aren't the same at all.
An outdated fix for a different issue is behind this one. Myth: "Add some two-stroke oil and drive the car home." That petrol is still in the tank afterwards, and what it has weakened isn't put back.
"Drain it yourself and you're sorted" — a myth, because after it has been running some petrol sits in the filter and lines, waiting to go right back through the pump on the next start. On top of that, petrol emptied into a can by the road is truly risky.
How petrol ends up: petrol in a diesel
It is rarely carelessness, and no one does it on purpose. The petrol nozzle is the narrower of the two and slides 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.
When habit and the vehicle stop matching, it happens. A new car, a hire car or a courtesy car. Two motors on one driveway, one petrol, one diesel. A forecourt you know, but with its pumps arranged differently. A train to catch, and a rushed fill on the way to Cark. Years of petrol motors behind you, a diesel Volkswagen Passat in front of you at the forecourt for its first tank — that's when. With rain, a call coming in, or children to deal with, your hand just does what it always has.
Avoiding petrol in a diesel next time you fill up around Brow Edge
- The label is what matters, so read the petrol pump instead of the colour: in the UK unleaded handles are usually green and diesel black, but not on every forecourt.
- The first fill in a new vehicle is the time to check your filler flap — inside it, or on the cap, many cars state which fuel they take.
- Label your key. In a house with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- Before the nozzle comes off the petrol pump the first time you fuel a hired or new vehicle, say "diesel" aloud. Silly, perhaps, but it works.
- Put the phone away. This is an easy mistake to make whilst you are thinking about something else.
- Some diesels come with a filler designed to reject a petrol nozzle, and devices you can add are available for motors without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the petrol pump.
- Stop the moment you realise. Less petrol inside that tank means a thinner mixture. It doesn't change what to do next, which is still not to crank it.
Put petrol in a diesel in Brow Edge already?
Then the order of things is brief. Do not crank it, and do not turn the ignition on. The staff on the forecourt — whether at Esso itself or wherever you filled up — will usually help roll it away from the petrol pump if you ask. Ring 0333 366 0103 next, with three answers — your fuel, the rough quantity, and whether it's run.
If it was AdBlue instead of petrol, say so. That is a different fault — corrosion and deposits instead of lost protection — and it has its own page for Brow Edge.
Brow Edge petrol in a diesel tasks: why one costs more than another
An honest single quote doesn't exist here: four scenarios, four separate tasks. What shifts the cost is mostly which of them you are in. The ratio counts next, meaning how much of your tank is petrol, and then the location of the vehicle and whether getting to it is safe for our van.
What went in, how much, and if it has run — three questions our engineers ask before pricing, not after, for exactly that reason. Given the replies, there is a straight figure instead of a range.
About Brow Edge
Brow Edge is a small locality on the southern edge of Cumbria's coastal area, situated near the towns of Backbarrow and Haverthwaite. Brow Edge has a population of around 510 people and is characterised by detached housing. Brow Edge sits at a relatively low elevation of 26 metres, close to the coast and within a short distance of Lancaster, the nearest city. Brow Edge is part of the wider landscape of the North West region, with the major city of Lancaster being 15.9 miles away.
Fuel drain cover around Brow Edge and across Cumbria
Petrol in diesel calls around Brow Edge — part of the LA postcode area — go to teams that also cover the places around it, Backbarrow, Low Wood and Haverthwaite included. We drain where your vehicle 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 petrol pump around Brow Edge?
The best position there is, then — that's where you are. Leave the vehicle turned off, and ring.