Spixworth: Petrol in a Diesel Car? How Worried to Be
Unstarted? Then less anxious than you probably are. Until your ignition primes the pump, your starter turns, or your car is driven, petrol in a diesel tank just waits there and does no harm. Which means the honest reply to the first Spixworth query — "have I ruined it?" — usually no. Leave your motor off and phone Petrol in Diesel — that keeps it like that. The remainder of this page explains 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 the engine?
Passing through a motor, diesel does two jobs at the same time. Lubricating comes before burning; it does both. Made to extremely fine tolerances, the fuel injectors and your pump rely on the diesel flowing through them to keep their surfaces from wearing against one another.
Badly at the first, not at all at the second: that is petrol. The rattling 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 away the lubrication your system depends on, and any pump working on that blend is wearing itself.
The shape of the problem is clear when you put those together. Not contact but circulation is what does the damage. Petrol in the tank is a fuel issue. Whatever a worn pump sheds goes on, carried by the fuel, into the injectors further along, which is why a pump that has worked on the petrol is where a mechanical fault starts.
Spixworth, petrol in a diesel: four cases, from mild to major
Fuelled but never started — the best it gets. At a forecourt, and truly only there, that petrol is still confined to the tank — because anywhere else your car was driven to reach it. The task is draining and cleaning on the spot.
Ignition on, or started for a second. Once primed, the fuel system has drawn petrol out of your tank up to the filter and the fuel lines. That's normally still a simple job — a drain, a flush, and the fuel filter dealt with.
Driven a couple of miles. Now your pump has spent these miles running on thinned fuel. Distance is only half of that; how hard it was driven matters just as much. Either way this work includes that tank, the fuel lines, the fuel filter and clean fuel through the whole system. Short trips, like the school run to Spixworth Infant School, are one thing. Very different again: a trip to Norwich, under 5 miles away, or some mileage on the M11, over 50 miles from Spixworth, where the engine kept working hard.
Knocking, an uneven idle, smoke, a throttle gone soft: driven until it complained. What you are hearing is the engine signalling fuel that no longer acts like diesel. Pull up wherever you are — the verge on Crostwick Lane, a lay-by, a side street — then leave the car where it is. What goes first is still the drain and flush-through, and that deals with it, with lasting damage very unusual when a car is stopped early.
Spixworth motorists and the petrol in a diesel stories they hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Topping up removes nothing; it gives you a fuller tank of the same mixture. A diesel fuel system does not tolerate petrol by percentage in the way that advice supposes.
Not so: a current diesel copes with a bit of petrol. Rather, the opposite. At higher pressure, through smaller components: that's how a current diesel handles its fuel, and so the protection matters for more, not less.
"It starts, it drives, so there is no harm" — the myth that catches more drivers than any other. The motorist of a petrol motor fed diesel normally stops, because it will not run, and the damage stops there. Feed petrol to a diesel and it generally starts, ticks over and drives away as if nothing happened — all while its pump is wearing. Running is not the same as fine.
Myth: "Add some two-stroke oil and drive the car home." It's an old workaround for a different problem. It doesn't put back what petrol has weakened, and the petrol is still inside that tank after that.
The next start draws petrol back round your pump from the fuel lines and the filter, where some of that ends up once your engine has run. That is why draining your tank yourself does not leave you sorted — a myth. Emptying petrol into a can by the kerbside is also truly risky.
How petrol ends up: petrol in a diesel
On purpose? Never. Through carelessness? Seldom, if ever. The forecourt makes it simple: the petrol nozzle is the narrower of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle generally will not go into a petrol vehicle at all. So the error runs one way.
The moment routine stops matching the car is the moment it happens. A new vehicle, a hire car or a courtesy car. Households running one of each, petrol and diesel. A forecourt you know, but with its pumps laid out differently. A train to catch, and a rushed fill en route to Salhouse. A new-to-you diesel Renault Megane, its first fuelling, and a driver used to petrol: exactly when it takes place. Throw in a back seat full of kids, a phone call or rain, and habit takes over.
Next time you fill up in Spixworth: avoiding petrol in a diesel
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most usually do. Read the petrol pump's label; the colour is just a clue.
- Plenty of motors state the fuel type inside the filler flap or on the cap, and so check there on your first fill in any car you do not know.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, for a home with one of each.
- Before the nozzle comes off the pump the first time you fill a hired or new motor, say "diesel" out loud. Silly, perhaps, yet it works.
- Tuck your phone away. This is an easy mistake to make while 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 vehicles without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the pump.
- Stop as soon as you realise. Less petrol inside your tank makes a weaker blend. It doesn't change what to do next, which is still not to crank it.
Petrol already in a diesel in Spixworth? Begin here
Short and simple, then, is the order of things. Starting it is out, and so is turning on your ignition. Ask the attendants to help you push it away from the pump if you are still on the forecourt, whether that is Harvest Energy or anywhere else. What got in, about how much, and whether it has run: tell us those when you ring 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a separate issue — Spixworth has a page all for it.
Why one petrol in a diesel task in Spixworth costs more than another
A fair single price does not exist here: four scenarios, four separate jobs. The situation itself does most of the work of moving your cost. Where your car is matters too, and whether a technician can safely get to it, after the share of petrol to what your tank holds.
Three questions come first, before any quote, rather than after — what got in, how much, has it run — and this is the reason. Those replies are what turn a range into one firm number.
About Spixworth and its setting
Spixworth is a village in Norfolk, situated approximately 4 miles north of Norwich, and is characterized by its predominantly detached housing stock. Spixworth sits in a low-lying area of the Norfolk countryside, with an elevation of around 13 metres above sea level. Spixworth is close to several nearby villages, including Crostwick, Frettenham, and Horsham St Faith, and is within commuting distance of Norwich. Spixworth has a population of around 2560 people, according to recent estimates.
Across Norfolk and in Spixworth: fuel drain cover
The teams answering petrol in diesel jobs around Spixworth, in the NR postcode area, equally work the places near it, Crostwick, Frettenham and Horsham St Faith included. The vehicle doesn't need to come to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
At the petrol pump in Spixworth, right now?
Then, you could not be in a better position. Leave the vehicle switched off, then ring.