Great Clacton: Petrol in a Diesel Car? How Worried to Be
Likely less than you already are — provided nobody has started it. Petrol sitting in a diesel tank does nothing to the engine until something draws it through your fuel system — your ignition priming your pump, your starter, or the drive itself. So the fair answer to the first query everyone in Great Clacton asks, "have I ruined it?", is generally no. Petrol in Diesel is who to ring, with the motor kept off, and so it remains that way. The remainder of this page covers what petrol really does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you a second time.
What petrol in a diesel does to the engine
Diesel does two tasks on its way through a motor. It protects first, and after that does it burn. What stops the surfaces inside your high-pressure pump and the fuel injectors from wearing against one another is the diesel flowing through them — they're built to extremely fine gaps.
Petrol handles the first task badly and the second not at all. It is thinner than diesel and strips away the lubrication the fuel system hinges on, so a pump running on a petrol blend is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That's where the clattering comes from.
Combined, those leave the shape of the problem plain. Not contact but circulation is what does the damage. Any tank with petrol in it is a fuel fault. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the injectors further on.
Great Clacton, petrol in a diesel: four cases, from mild to serious
Fuelled, and never started: no case is better. The petrol is in the tank and just that tank, and the job is a drain and a flush where the vehicle sits. This is the one situation that can only truly occur at a forecourt, as anywhere else the vehicle has been driven to get there.
Your ignition switched on, or a brief start. Petrol has come out of that tank and reached the fuel filter and the lines, since your system has been bled. Normally little more than clearing, purging and seeing to the fuel filter, and so still straightforward.
Those few miles driven were your pump running on fuel thinned by petrol the whole way. Tank, lines, filter, then clean fuel run through the entire system: that's this work, and the way the vehicle was driven matters as much as the miles. Driving the children to Great Clacton Church of England Junior School is one sort of trip. A run as far as Colchester, under 15 miles away, is a very different task. So is any mileage on the M2, under 50 miles from Great Clacton, where your engine has been working hard throughout.
Driven on until it complained — rattling, smoke, a lumpy idle, a dead throttle. The motor is telling you the fuel is no longer acting like diesel. Stop wherever you are — the verge on St Johns Road, a lay-by, a side street — and leave it where it is. What goes first is still the fuel drain and flush-through, and that takes care of it, with long-term damage very rare if a vehicle is pulled over soon.
What Great Clacton motorists get told about petrol in a diesel — and the myths in it
Myth: topping up to full with diesel makes it fine. It does not. Topping up takes out nothing; it gives you a bigger tank of the same mixture. A diesel fuel system does not tolerate petrol by percentage in the way that guidance presumes.
Not so: a modern diesel copes with a bit of petrol. If anything, the reverse. A newer diesel runs its fuel through smaller components at higher pressure, which makes the lubrication count more, not less.
"It starts, it drives, so no harm done" — the myth that catches most drivers than any other. The driver of a petrol motor fed diesel usually has no choice but to stop, because it will not run, and the damage stops with them. Whilst the pump wears, a diesel fed petrol normally starts, ticks over and drives away as though nothing has happened. Fine and running aren't the same thing.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a different issue. What petrol has diluted stays weakened, and that petrol stays inside that tank anyway.
The next start draws petrol back round your pump out of the lines and the fuel filter, where some of it sits after the engine has run. That's why draining your tank yourself doesn't sort it — a myth. Clearing petrol into a can by the kerbside is also really hazardous.
How does petrol in a diesel take place?
On purpose? Never. Through carelessness? Seldom, 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 slip runs one way.
When habit and your car stop matching, it occurs. A motor that's new to you — a hire car, on loan as a courtesy car, or just bought. One petrol and one diesel on the driveway of the same household. Your normal forecourt, its pumps suddenly in a different order. A rushed fill en route to Clacton-On-Sea with a train to catch. Exactly the moment it occurs: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
Next time you fill up around Great Clacton: avoiding petrol in a diesel
- A green handle for unleaded and black for diesel is normal in the UK — yet not on each forecourt. Go by the label on the pump, not the colour.
- Plenty of vehicles state the fuel type inside your filler flap or on the cap, so check there on the first fill in any motor you do not know.
- One of each in the house? Mark your key to the diesel — a bright fob, a sticker — since intending to remember is not enough.
- 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 sounds daft and it does the trick.
- Whilst you are thinking about something else, this is an easy mistake to make — so put your phone away.
- Add-on devices are available for motors without one, and some diesels are built with a filler that won't accept a petrol nozzle. Useful — but a safety net at best, never a reason to stop checking the label.
- The moment you realise, stop: less petrol in the tank makes a weaker mix. What to do next does not change, though — still do not start the car.
Petrol already in a diesel in Great Clacton? Start here
The order of things is short, then. Starting it is out, and so is switching on the ignition. Ask the staff to help you push it clear of the petrol pump if you are still on the forecourt, whether that's Asda or anywhere else. Then call 0333 366 0103 and tell us what was put in, roughly how much, and if it has run.
Say so if it was AdBlue rather than petrol: it's a different issue, with its own page for Great Clacton, because AdBlue brings corrosion and deposits rather than lost protection.
One petrol in a diesel task around Great Clacton costs more than another. Why?
An honest single quote does not exist here: four situations, four separate jobs. What moves your cost is mostly which of them you're in. Beyond that it's the proportion — how much petrol was put in against how much that tank holds — and after that where the vehicle is and whether a van can get to it safely.
What was put in, how much, and if it's run — three queries our engineers ask before quoting, not after, for precisely that reason. Their answers are what change a range into one firm number.
About Great Clacton
Great Clacton is a suburban area located on the coast of Essex, with Burrsville Park and Bockings Elm nearby, and is situated approximately 12 miles from Colchester. Great Clacton has a population of around 6698 people and is characterised by semi-detached housing. Great Clacton sits at an elevation of 14 metres above sea level, close to the larger town of Clacton-on-Sea. Great Clacton is also within commuting distance of London, being around 59 miles from the capital.
Fuel drain cover across Essex, Great Clacton included
Great Clacton sits in the CO postcode area, and our teams that answer petrol in diesel call-outs there work the places around it as well — Burrsville Park, Bockings Elm and Clacton-on-Sea among them. A forecourt, a supermarket car park, a lay-by or your own drive are all spots our technicians drain, and the vehicle does not need to move to us.
In Great Clacton and still at the pump?
In that case, you could not be in a better position. Keep it off. Phone.