Should You Worry? Petrol in a Diesel Car in Cherry Orchard
Far less than you likely are, if it has not been started. "Have I wrecked it?" is the first thing everyone in Cherry Orchard asks, and the honest answer is normally no, because petrol resting in a diesel tank harms nothing till it's dragged through the system — by ignition priming, by your starter, or by driving. Petrol in Diesel is who to phone, with your motor kept off, and so it remains that way. 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 again.
The motor and petrol in a diesel: what goes on
Two jobs fall to diesel on its journey through a motor. Before it burns, it protects — then it ignites. Built to very fine gaps, the injectors and the pump rely on the diesel flowing through them to stop their surfaces wearing against one another.
Of these two tasks, petrol handles the first badly and the second not at all. The clattering comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection the fuel system rests on, and any pump running on that mixture is wearing itself.
Seen together, they show what shape the trouble has. It is movement that causes the harm, not contact. Any tank with petrol in it is a fuel problem. Whatever a worn pump sheds travels on, carried by your fuel, into the injectors further along, which is why a pump that has worked on the petrol is where a mechanical issue starts.
Four scenarios our engineers see in Cherry Orchard: how serious is petrol in a diesel?
Fuelled up, never started. The best case there can be. Only that tank has petrol in it, and so the job is draining your tank and purging the system where the car stands. This situation can only truly happen on a forecourt: anywhere else, the vehicle got there by being driven.
Ignition on, or started for a moment. With your system primed, your lines and filter now contain petrol that has come from that tank. Normally little more than emptying, rinsing and sorting your filter, so still straightforward.
Your pump has spent a couple of miles on thinned fuel — that's what driving the car does. Tank, lines, filter, then fresh fuel run through the entire system: that is the work, and the way the vehicle was driven matters as much as the distance. A school run to Cherry Orchard Primary School is one matter. A run as far as Worcester, under 3 miles away, is a very different job. So is any miles on the M5, under 3 miles from Cherry Orchard, where your engine has been labouring hard throughout.
It protested, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. That's the engine telling you its fuel has stopped behaving like diesel. Whether it's the verge on Cavendish Street, a lay-by or a side road, stop where you are and leave it. A car pulled over early very rarely has long-term damage, as the fuel drain and the flush-through, which still come first, deal with it.
Cherry Orchard motorists and the 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." Topping up takes out nothing; it gives you a fuller tank of the same mixture. That advice supposes a diesel fuel system handles petrol by percentage. It does not.
"Modern diesels can handle a little petrol" — a myth, and nearer the opposite. Finer parts and higher pressure are how a modern diesel runs its fuel, and that makes the protection matter more, not less.
"It starts, it drives, so no harm done" — the myth that catches most people than any other. Diesel in a petrol motor usually leaves a motor that won't run: the driver stops, and so does the harm. A diesel fed petrol generally starts, idles and drives away as if nothing has happened, while the pump grinds. Running does not mean fine.
Myth: "Add some two-stroke oil and drive the car home." It's an old workaround for a separate issue. That petrol is still inside that tank after that, and what it has thinned is not put back.
Myth: "Drain your tank yourself and you're sorted." Once the engine has been run, some of that petrol is no longer inside your tank: it's in your filter and your lines, and it goes right back through the pump on your next start. And, a can of petrol drained by the roadside is genuinely hazardous.
How petrol ends up: petrol in a diesel
On purpose? Never. Through carelessness? Seldom, if ever. A diesel nozzle generally won't fit a petrol motor, yet the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error easy, and only in one direction.
When habit and your car stop matching, it takes place. Any motor that is new to you — hired, on loan as a courtesy car, or brand new. A household with one petrol and one diesel on the driveway. The pumps in a different order on a familiar forecourt. A train to catch, and a rushed fill on the way to Worcester Foregate Street. A new-to-you diesel Renault Megane, its first fuelling, and a motorist used to petrol: exactly when it occurs. Add a back seat full of children, a phone call or rain, and habit takes over.
Avoiding petrol in a diesel next time you fill up around Cherry Orchard
- Check the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, yet not on each forecourt. The label is what counts.
- In a motor you don't know, look inside the flap over the filler or at the cap before the first fill: many cars print the fuel there.
- Mark 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 intending to remember.
- It seems daft and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the pump.
- Tuck your phone away. This is an easy mistake to make whilst you're thinking about something else.
- Some diesels come with a filler built to block a petrol nozzle, and devices you can add exist for cars without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop checking the petrol pump.
- Stop the moment you notice. Less petrol inside that tank makes a thinner blend. It doesn't change what to do next, which is still not to crank it.
Petrol already in a diesel in Cherry Orchard? Start here
The order of things is short, then. Do not switch the ignition on, and don't fire it up. Ask the attendants to help you roll it clear of the pump if you're still on the forecourt, whether that is Esso or anywhere else. Ring 0333 366 0103 next, with three facts — your fuel, the rough amount, and if it has run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a different problem — Cherry Orchard has a page just for it.
Why one petrol in a diesel job in Cherry Orchard costs more than another
The four scenarios above are four different jobs, so no single price for this would be honest. The scenario itself does most of the work of moving the cost. Two things follow that: the petrol that got in as a proportion of what your tank holds, then the spot the vehicle is in and whether our van can get to it safely.
That's why we ask three questions before costing rather than after: what went in, how much, and if it's run. A range becomes a straight figure once the replies are in.
About Cherry Orchard, briefly
Cherry Orchard is a suburban area located on the riverside in Worcestershire, with a low elevation of around 20 metres. Cherry Orchard sits close to the city of Worcester, approximately 1 mile from the city centre, and is part of the wider West Midlands region. Cherry Orchard has a population of around 5085 people and predominantly consists of semi-detached housing.
Cherry Orchard and Worcestershire: where our fuel drain cover runs
Cherry Orchard sits in the WR postcode area, and the vans that answer petrol in diesel calls there work the spots near it as well — Diglis, St Peter The Great and St Peter the Great among them. Our technicians drain where your car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the petrol pump in Cherry Orchard?
In that case, you couldn't be in a better spot. Switched off it stays; then phone.