How Worried Should You Be? Petrol in a Diesel Car in Painthorpe
Far less than you probably are, if it hasn't been started. Till the ignition primes your pump, the starter cranks, or your car is driven, petrol in a diesel tank simply sits there and does nothing. Which makes the honest reply to the first Painthorpe question — "have I ruined it?" — normally no. To leave it that way, call Petrol in Diesel then leave your motor alone. The rest of this page sets out what petrol really does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you again.
Petrol in a diesel: what does it do to your engine?
Two tasks fall to diesel on its route round a motor. Lubricating comes before burning; it does both. Very fine tolerances are built into the fuel injectors and the high-pressure fuel pump, and only the diesel flowing through stops their surfaces grinding together.
The second job petrol doesn't do at all, and the first it does poorly. The knocking 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 thinner than diesel, it strips away the protection the fuel system rests on, and any pump working on that mixture is wearing itself.
Together, those leave the shape of the problem clear. It is movement that causes the damage, not contact. Any tank with petrol in it is a fuel issue. Whatever a worn pump sheds travels on, carried by the fuel, into your injectors downstream, which is why a pump that has been working on the petrol is where a mechanical issue starts.
Painthorpe, petrol in a diesel: four situations, from mild to major
Fuelled, and not started: nothing beats it. Being at a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With the petrol held in that tank alone, it is drained and cleaned right where it stands, and nothing more is needed.
Ignition on, or started for a moment. The system has been bled, and so petrol has left the tank and reached the filter and the fuel lines. That's generally still an easy task — a drain, a flush, and the filter dealt with.
A couple of miles driven, and your pump has spent each of them labouring on thinned fuel. Distance is only half of it; how hard it was driven counts just as much. Either way this work includes your tank, your lines, the fuel filter and fresh fuel through the entire system. On the school run to Crigglestone Dane Royd Junior and Infant School, the miles is short. Very different again: a run to Wakefield, under 5 miles away, or any mileage on the M1, under a mile from Painthorpe, where your engine never stopped labouring hard.
Driven on till it complained — knocking, smoke, an uneven idle, a dead throttle. That's the engine telling you its fuel no longer is behaving like diesel. Stop wherever you are — the verge on Painthorpe Lane, a lay-by, a side street — and leave the car where it is. What goes first is still the drain and flush-through, and that takes care of it, with permanent damage very uncommon if a car is stopped quickly.
Painthorpe motorists and that petrol in a diesel myths they hear
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 simply carries more of the same blend. Percentage is not how a diesel fuel system copes with petrol, however much that guidance presumes.
Not so: a newer diesel copes with a bit of petrol. If anything, the opposite. A current diesel sends its fuel through smaller parts at higher pressure, which makes the lubrication count more, not less.
This is the one that catches drivers. Myth: "If it starts and drives, there is no harm done." Diesel in a petrol motor normally means a motor that won't run: the driver stops, and so does the damage. Whilst the pump grinds, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Running doesn't mean fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct problem. The petrol is still in that tank afterwards, and what it has diluted isn't put back.
"Drain it yourself and you're sorted" — a myth, because after it's been running some petrol sits in your filter and lines, waiting to go straight back through the pump on the next start. Draining petrol into a can at the roadside is also really dangerous.
Why petrol in a diesel takes place at all
It is seldom carelessness, and no one does it on purpose. One way only, because of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly won't fit a petrol motor. That is how the forecourt makes it easy.
Routine and the car falling out of step is how it takes place. Courtesy car, hire car, or a motor that's brand new. A household with one petrol and one diesel on the drive. A forecourt you know, only with its pumps laid out differently. A train to catch, and a rushed fill on the way to Sandal & Agbrigg. Years of petrol vehicles behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that's when. Your hand repeats what it has always done once you add rain, a phone call or a back seat full of kids.
Next time you fill up in Painthorpe: avoiding petrol in a diesel
- Read the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on each forecourt. The label is what matters.
- In a motor you don't know, look inside the flap over your filler or at the cap before the first fill: many motors print the fuel there.
- Label the key. In a home with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- It sounds daft and it does the trick: on your first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the petrol pump.
- Mistakes like this are simple to make while your mind is on something else, so the phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler built to block a petrol nozzle, and add-on devices are available for vehicles without one. They are a backstop, not a reason to stop checking the pump.
- Stop the moment you notice. Less petrol inside your tank makes a weaker mixture. It does not change what to do next, which is still not to crank it.
Painthorpe: already put petrol in a diesel?
The order of things is brief, then. Starting it is out, and so is switching on your ignition. If you are still on the forecourt — BP or anywhere else — ask the staff to help you push the car clear of the pump. Next, 0333 366 0103. We'll ask what got in, roughly how much, and if it's been run.
If it was AdBlue and not petrol, say so. That's a separate problem — corrosion and deposits instead of lost lubrication — and it has its own page for Painthorpe.
Painthorpe petrol in a diesel tasks: why one costs more than another
There's no honest single quote for this, because the four situations above are four different jobs. What moves the cost is chiefly which of them you're in. After that it is the share — how much petrol went in against how much your tank takes — and then where the car is and whether a technician can get to it safely.
What went in, how much, and whether it's run — three questions our engineers ask before pricing, not after, for precisely that reason. Those answers turn a range into a straight figure.
About Painthorpe, briefly
Painthorpe is a locality in West Yorkshire, situated approximately 3.5 miles from Wakefield, and is characterized by its semi-detached housing stock. Painthorpe lies inland, with an elevation of around 71 metres, and is part of a network of local communities including Hall Green, Hollingthorpe, and Chapelthorpe. Painthorpe is home to a population of around 1582 residents, who are likely to commute to nearby Wakefield for work and amenities.
Fuel drain cover across West Yorkshire, Painthorpe included
Petrol in diesel calls around Painthorpe — part of the WF postcode area — go to vans that likewise cover the places around it, Hall Green, Hollingthorpe and Chapelthorpe among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots we drain, and the car doesn't need to move to us.
At the petrol pump around Painthorpe, right now?
Then you are in the best spot there can be. Call, and keep it switched off.