Should You Worry? Petrol in a Diesel Car in Peterlee
Not started? Then less worried than you probably are. "Have I wrecked it?" is the first thing anyone in Peterlee asks, and the honest answer is normally no, because petrol left in a diesel tank hurts nothing till it's dragged through the fuel system — by ignition priming, by the starter, or by being driven. To keep it like that, phone Petrol in Diesel and leave your engine alone. The remainder of this page explains what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you a second time.
Your engine and petrol in a diesel: what goes on
Diesel does two jobs on its way through a motor. It ignites, and before it burns it lubricates. Built to extremely fine tolerances, the fuel injectors and the pump rely on your diesel moving through them to stop their surfaces wearing against one another.
The second job petrol does not do at all, and the first it does badly. It's runnier than diesel and takes away the lubrication your fuel system rests on, and so a pump running on a petrol blend 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 is where the rattling comes from.
Put those together and the shape of the trouble is plain. It's movement that causes the harm, not contact. A tank with petrol in it is a fuel problem. A pump that has been working on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with your fuel to the injectors downstream.
How serious is petrol in a diesel? Four situations our engineers see around Peterlee
Filled up, and not started: no case is better. At a forecourt, and truly only there, the petrol is still confined to your tank — since everywhere else your car was driven to get to it. The job is draining and flushing on the spot.
A brief spell of running, or just the ignition on. Once primed, the fuel system has drawn petrol from the tank as far as the fuel filter and your lines. That's usually still a simple task — a drain, a flush, and the filter seen to.
Your pump now spent a couple of miles on weakened fuel — that's what driving the car does. The work is your tank, your lines, the fuel filter and clean fuel through the entire system, and how hard the vehicle was driven counts as much as how far. Short trips, like the school run to Our Lady of the Rosary Catholic Primary School, are one matter. Any miles on the A1(M), under 10 miles from Peterlee, means the motor working hard throughout, and a run to Durham, under 10 miles away, makes a very different job as well.
Driven on until it complained — clattering, smoke, an uneven idle, a dead throttle. What you are hearing is the engine reporting fuel that no longer behaves like diesel. Leave it wherever it has stopped: a lay-by, a side street, the verge on Surtees Road. Permanent damage is very unusual if a vehicle is stopped early, and the fuel drain and flush-through that still come first sort it out.
Petrol in a diesel stories Peterlee motorists hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up takes out nothing; it gives you a fuller tank of the same mix. A diesel fuel system does not tolerate petrol by percentage in the way that guidance supposes.
Myth: a modern diesel copes with a bit of petrol. Rather, the opposite. More precise parts and higher pressure are how a modern diesel runs its fuel, and that makes the lubrication count more, not less.
"It starts, it drives, so no harm done" — the myth that trips up more drivers than any other. Any petrol engine fed diesel usually will not run, so the motorist stops and the damage stops with them. Feed petrol to a diesel and it normally fires up, ticks over and drives away as if nothing happened — all the while its pump wears. Fine and running are not the same thing.
Myth: "Add some two-stroke oil and drive it home." It is an old fix for a separate issue. That petrol is still inside the tank after that, and what it has weakened isn't put back.
If your engine has been run, part of the petrol is in the filter and the lines, not that tank — and your next start sends it straight back through your pump. So the myth "drain that tank yourself and you're sorted" doesn't stand up. And, a can of petrol drained at the roadside is truly risky.
How does petrol in a diesel take place?
It's seldom carelessness, and no one does it on purpose. A diesel nozzle generally won't fit a petrol car, but the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error straightforward, and only in that direction.
Habit and your car getting out of step is when it takes place. A new car, a hire car or a courtesy car. Households running one of each, petrol and diesel. The pumps in a different order on a well-known forecourt. Racing for a train at Horden and fuelling up en route. Years of petrol vehicles behind you, a diesel Volkswagen Passat 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 always has.
How to avoid petrol in a diesel at your next fill-up around Peterlee
- Green for unleaded and black for diesel is usual in the UK — yet not on every forecourt. Go by the label on the pump, not the colour.
- The first fill in a new vehicle is the time to check the filler flap — on it, or on the cap, plenty of cars state which fuel to use.
- Mark 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 meaning to remember.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump. It seems daft and it does the trick.
- Put your phone away. This is an easy mistake to make whilst you're thinking about something else.
- Some diesels have a filler designed to block a petrol nozzle, and devices you can add exist 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.
- As soon as you realise, stop: less petrol in your tank makes a thinner blend. What to do next does not change, though — still don't fire it up.
Put petrol in a diesel in Peterlee already?
Short and simple, then, is the order of things. Starting it is out, and so is turning on the ignition. Ask the attendants to help you push it clear of the pump if you are still on the forecourt, whether that is Asda or somewhere else. What was put in, about how much, and whether it has run: tell us that when you phone 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a different fault — Peterlee has a page all for it.
One petrol in a diesel task around Peterlee costs more than another. Why?
A fair single price does not exist here: four situations, four separate tasks. The situation itself does most of the work of moving the cost. After that it is the share — how much petrol went in against how much the tank takes — and then where the car is and whether our van can reach it safely.
That is why our engineers ask three queries before costing instead of after: what went in, how much, and whether it has run. Those replies change a range into a straight figure.
About Peterlee itself
Peterlee is a town in County Durham, situated on the coast of north-east England, approximately 101 metres above sea level. Peterlee lies near the cities of Durham and Sunderland, and is close to the villages of Horden, Shotton, and Little Thorpe. Peterlee has a population of around 22,251 people, and its housing stock is predominantly semi-detached homes.
Across Durham and in Peterlee: fuel drain cover
Horden, Shotton and Little Thorpe are among the locations near Peterlee that the same teams work, answering petrol in diesel call-outs across Peterlee's SR postcode area. The vehicle does not need to move to us: our engineers drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the petrol pump around Peterlee?
Then you're in the best spot there can be. Phone, and leave it turned off.