Should You Worry? Petrol in a Diesel Car in Bradley
Far less than you likely are, provided it hasn't been started. Petrol resting in a diesel tank does nothing to your motor until something draws it through the fuel system — your ignition priming the pump, the starter, or the drive itself. So the fair answer to the first query anyone around Bradley asks, "have I ruined it?", is generally no. Leave your engine off then ring Petrol in Diesel — that is how you keep it that way. The rest 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 doesn't happen to you a second time.
Inside the engine: what petrol in a diesel really does
On its way through a motor, diesel does two jobs. Oiling comes before burning; it does both. The high-pressure fuel pump and the fuel injectors are made to extremely fine tolerances, and the diesel passing through them is what stops those surfaces from grinding against one another.
Badly at the first, not at all at the second: that is petrol. The clattering comes from petrol being made 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 out the lubrication your system rests on, and any pump working on such a blend is wearing itself.
Together, those leave the shape of the issue plain. It's movement that does the harm, not contact. Any tank with petrol in it is a fuel issue. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with your fuel to the fuel injectors downstream.
Four scenarios our engineers see in Bradley: how bad is petrol in a diesel?
Fuelled but not once started — as good as it gets. On a forecourt, and truly only there, the petrol is still confined to the tank — since anywhere else the vehicle was driven to get to it. The job is emptying and purging on the spot.
The ignition switched on, or a brief start. The system has been primed, so petrol has left that tank and reached the filter and the fuel lines. Drain, flush, deal with the fuel filter: still normally straightforward.
Driven a few miles. Now your pump has spent these miles labouring on weakened fuel. The work is the tank, your lines, the fuel filter and fresh fuel through the entire circuit, and how hard the vehicle was driven matters as much as how far. On the school run to Western Primary School, the mileage is small. A run as far as Kingston upon Hull, under 25 miles away, is a very different task. So is any miles on the M180, under 15 miles from Bradley, where the engine has been running hard the whole time.
It protested, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. The engine is telling you the fuel is no longer behaving like diesel. Leave it wherever it stops: a lay-by, a side street, the verge on St Michael's Road. What goes first is still the drain and flush-through, and that sorts it out, with lasting damage very rare if a car is pulled over early.
Myths Bradley people hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." A fuller tank of the same mix is all you get, because topping up removes nothing. The assumption behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong.
"Modern diesels can handle a little petrol" — a myth, and nearer the reverse. At higher pressure, through more precise parts: that is how a modern diesel handles its fuel, so the lubrication counts for more, not less.
This is the one that catches motorists. Myth: "If it starts and drives, there's no harm done." Any petrol motor fed diesel normally will not run, and so the motorist stops and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile the pump grinds. Fine and running aren't the same at all.
An outdated workaround for a distinct fault lies behind this one. Myth: "Add some two-stroke oil and drive it home." None of what petrol diluted is put back by it — and afterwards, your tank still contains the petrol.
Myth: "Drain that tank yourself and you're sorted." After the engine has been run, some of the petrol is no longer in the tank: it's in the filter and the lines, and it goes right back through your pump on your next start. Besides, petrol drained into a can by the road is truly dangerous.
Why petrol in a diesel happens so easily
Carelessness is seldom the cause, and no one means to do it. A diesel nozzle mostly won't go into a petrol motor, yet the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake simple, and just in one direction.
It occurs when habit and the vehicle stop matching. A new motor, a hire car or a courtesy car. Households running one of each, petrol and diesel. Your normal forecourt, its pumps now in a different order. A rushed fill en route to Great Coates with a train to catch. The first fill-up in a diesel Volkswagen Passat after years of driving petrol is exactly the moment it takes place. With rain, a call coming in, or children to deal with, your hand simply does what it always has.
Bradley drivers: how to prevent petrol in a diesel next time
- Check the petrol pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on each forecourt. The label is what counts.
- Plenty of motors state the fuel inside the filler flap or on the cap, and so check it on your first fill in a vehicle you don't know.
- Label the 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 lift the nozzle off the pump. It seems silly and it works.
- Mistakes like this are straightforward to make while your mind is on something else, so your phone goes away.
- Add-on devices exist for cars without one, and some diesels come with a filler that won't accept a petrol nozzle. Helpful — but a backstop at best, never a reason to stop checking the label.
- Spotting it halfway? Stop at once. A thinner mixture follows from less petrol inside your tank, yet the next step stays the same: don't start the vehicle.
Petrol already in a diesel around Bradley? Begin here
In that case, there is only a short order of things. Starting it is out, and so is switching on your ignition. Still at the forecourt, at Morrisons or anywhere else? Ask the staff to help you push it away from the petrol pump. Next, 0333 366 0103. We'll ask what got in, about how much, and if it has been run.
Corrosion and deposits are the issue with AdBlue, whereas petrol means lost protection. So if it was AdBlue, say so — and see its own Bradley page.
What makes one Bradley petrol in a diesel job cost more than the next
Four separate jobs sit behind the four scenarios above — which is why there is no honest single price. What moves the cost is chiefly which of them you're in. Where the vehicle is counts too, and whether a technician can safely get to it, after the ratio of petrol to what the tank holds.
That's why we ask three questions before costing instead of after: what was put in, how much, and whether it has run. A range becomes a straight figure when the answers are in.
About Bradley
Bradley is a suburban area in northern Lincolnshire, situated near the coast and approximately 15 miles from Kingston upon Hull. Bradley sits at a low elevation of around 14 metres, with its semi-detached housing stock reflecting the residential character of the area. Bradley is part of a larger urban landscape that includes nearby places like Laceby Acres and Little Coates, and is home to around 5239 people.
Fuel drain cover across Lincolnshire, Bradley included
Bradley rests in the DN postcode area, and our vans that answer petrol in diesel call-outs there work the spots around it as well — Laceby Acres, Grange and Little Coates among them. You need not bring your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations where we work.
Still at the pump in Bradley?
No position is better: that's where you now are. Phone, and keep it switched off.