How Worried Should You Be? Petrol in a Diesel Car in Flint
Provided it hasn't been started, worry less than you likely are. Everyone around Flint begins with "have I ruined it?", and the honest answer is normally no: petrol resting in your tank of any diesel stays harmless till priming, cranking or driving draws it into your fuel system. Leave the motor off and phone Petrol in Diesel — that keeps it that way. What petrol really does to a diesel, how to judge how far it's gone, and how to stop it from happening again: that is the rest of this page.
The motor and petrol in a diesel: what goes on
Two tasks fall to diesel on its journey through a motor. It protects first, and only then does it burn. What stops the surfaces inside your high-pressure pump and the fuel injectors from wearing against each other is your diesel flowing through them — they are designed to extremely fine clearances.
Petrol handles the first task badly and the second not at all. The rattling comes from petrol being designed not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection the system rests on, and any pump working on such a mix is wearing itself.
The shape of the trouble is plain once you put those together. Not contact but movement is what causes the damage. A tank with petrol in it is a fuel problem. Whatever a worn pump sheds travels on, carried by your fuel, into your injectors downstream, which is why a pump that has been working on that petrol is where a mechanical problem starts.
How serious is petrol in a diesel? Four situations our engineers see around Flint
The best case there can be: filled up, not once started. Being at a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With that petrol held inside that tank alone, it is drained and flushed on the spot, and nothing more is needed.
A brief spell of running, or merely the ignition on. Once primed, your system has drawn petrol from the tank as far as the filter and your lines. Drain, flush, deal with the filter: still normally simple.
Driven a couple of miles. Now the pump has spent these miles labouring on diluted fuel. Tank, lines, filter, then clean fuel put through the whole system: that's the work, and the way the vehicle was driven counts as much as the distance. Driving the kids to Neston Primary School is one kind of trip. A run as far as Chester, under 15 miles away, is a very different task. So is any distance on the M53, under 10 miles from Flint, where the engine has been running hard throughout.
Driven on until it protested — rattling, smoke, a lumpy idle, a soft throttle. What you are hearing is your engine reporting fuel that no longer acts like diesel. Leave it where it has stopped: a lay-by, a quiet street, the verge on Heol-yr-Eglwys / Church Street. The drain and flush-through still go first, and they take care of it: if a vehicle is pulled over quickly, lasting damage is very unusual.
Petrol in a diesel myths Flint motorists hear
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing is removed by topping up — you're left with a bigger tank, still the same mixture. Percentage isn't how a diesel fuel system tolerates petrol, however much that guidance assumes.
"Current diesels can handle a little petrol" — a myth, and nearer the opposite. A newer diesel sends its fuel through finer parts at higher pressure, which makes the lubrication matter more, not less.
One myth that catches motorists out: if it starts and drives, it must be unharmed. Feed diesel to a petrol engine and it usually will not run, and so the motorist stops — and the harm stops with them. Whilst the pump grinds, a diesel fed petrol usually starts, ticks over and drives away as if nothing has happened. Fine and running are not the same thing.
Not so: a two-stroke additive lets you to drive home. It was an old workaround, meant for another fault. None of what petrol weakened gets put back by it — and afterwards, the tank still contains the petrol.
"Drain it yourself and you're sorted" — a myth, because after it has been running some petrol lies in the filter and lines, waiting to go right back through your pump at your next start. Besides, petrol cleared into a can by the road is genuinely hazardous.
How does petrol in a diesel happen?
No one does it on purpose, and it is rarely carelessness. One way only, since of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one generally will not fit a petrol car. That is how the forecourt makes it easy.
It takes place when habit and the car stop matching. Courtesy car, hire car, or a car that is new. A household with one petrol and one diesel on the drive. The pumps in a different order on a well-known forecourt. A rushed fill on the way to the nearest station with a train to catch. Years of petrol cars behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that's when. Add a back seat full of children, a phone call or rain, and habit wins.
Avoiding petrol in a diesel next time you fill up around Flint
- The label is what matters, and so check the petrol pump instead of the colour: in the UK unleaded handles are usually green and diesel black, yet not on every forecourt.
- The first fill in a strange car is the time to check your filler flap — inside it, or on the cap, many cars state which fuel to use.
- Label your key. In a house with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It sounds daft and it works.
- Put your phone away. This is an easy mistake to make while you are thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject a petrol nozzle, and add-on devices exist for motors without one. They are a backstop, not a reason to stop checking the petrol pump.
- Stop the moment you realise. Less petrol inside your tank makes a weaker blend. It does not change what to do next, which is still not to crank it.
Put petrol in a diesel around Flint already?
Short and simple, then, is the order of things. Leave it unstarted, with the ignition switched off too. Still on the forecourt, at Shell or anywhere else? Ask the staff to help you roll the vehicle clear of the pump. Call 0333 366 0103 next, with three facts — your fuel, the rough quantity, and whether it has run.
If it was AdBlue instead of petrol, say so. That is a separate fault — corrosion and deposits and not lost protection — and it has its own page for Flint.
Why one petrol in a diesel task around Flint costs more than another
Four different jobs sit behind the four scenarios above — which is why there is no fair single quote. The situation itself does most of the work of moving the cost. Two things follow that: the petrol that went in as a share of what that tank holds, then the place your car is in and whether a technician can reach it safely.
Ahead of any quote, not after, come three queries: the fuel that got in, its volume, and whether it's run. That is why. Those replies change a range into a straight figure.
About Flint, briefly
Flint is a coastal town in northeast Wales, situated near the English border and approximately 10 miles from Chester. Flint sits at a low elevation of around 12 metres, looking out over the Dee Estuary. Flint is characterized by its semi-detached housing stock and is close to nearby places such as Mount Pleasant and Pentre-Ffwrndan.
Fuel drain cover in Flint and across Flintshire
Petrol in diesel jobs in Flint — part of the CH postcode area — go to vans that also cover the locations round it, Mount Pleasant, Pentre-Ffwrndan and Oakenholt among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots we work, and the car does not need to move to us.
At the petrol pump around Flint, right now?
No position is better: that's where you are. Ring, and keep it turned off.