South End: Petrol in a Diesel Car? How Worried to Be
Provided it has not been started, you can worry far less than you likely are. "Have I ruined it?" is the first question everyone around South End asks, and the truthful answer is usually no, since petrol left in a diesel tank hurts nothing till it's drawn through your fuel system — by ignition priming, by your starter, or by driving. Petrol in Diesel is who to phone, with your engine kept off, so it remains that way. What petrol actually does to a diesel, how to judge how far it has gone, and how to keep it from happening again: that's the rest of this page.
Petrol in a diesel: what does it do to your engine?
Passing through a motor, diesel is doing two things at the same time. It lubricates first, and only then does it burn. Very fine tolerances go into the injectors and the high-pressure pump, and just the diesel flowing through keeps their surfaces from grinding together.
Badly at the first, not at all at the second: that is petrol. Being less viscous than diesel, petrol strips out the protection a fuel system needs, so a pump on that mixture to wear itself. It's equally made to resist igniting under compression — the reverse of what a diesel needs — which is where you hear the clattering.
Taken together, they show what shape the trouble takes. The harm is done by circulation, not by contact. Where that petrol is only in that tank, it is a problem of fuel, nothing more. After the pump has been running on that petrol, a mechanical fault has started: anything shed by a pump that's wearing travels onward to the injectors with your fuel.
Petrol in a diesel around South End: how bad is it? Four situations
Fuelled up, not once started. The best case there can be. Being at a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With the petrol held in that tank alone, it's cleared and cleaned right where it stands, and nothing more is needed.
A moment's running, or just your ignition on. The fuel system has been bled, and so petrol has left that tank and reached the fuel filter and the lines. Normally nothing more than emptying, rinsing and seeing to the filter, and so still straightforward.
Driven a couple of miles. Now the pump has spent these miles running on weakened fuel. Miles is only half of that; how hard it was driven matters just as much. Either way this work runs to that tank, your lines, your filter and fresh fuel through the entire system. Driving the children to Keelby Primary Academy is one sort of trip. Any mileage on the M180, under 10 miles from South End, means your engine working hard throughout, and a run to Kingston upon Hull, under 15 miles away, makes a very different job as well.
Driven until it complained. Knocking, a lumpy idle, smoke, a throttle that has gone soft. What you are hearing is your motor reporting fuel that no longer acts like diesel. Leave it where it stops: a lay-by, a quiet street, the verge on Suddle Way. What comes first is still the drain and flush-through, and that takes care of it, with permanent damage very rare if a vehicle is stopped soon.
What South End motorists get told about petrol in a diesel — and the stories in it
"Top it up the rest of the way with diesel and it will be fine" — a myth. It will not. Nothing comes out when you top up — the tank simply holds more of the same mixture. Percentage isn't how a diesel fuel system copes with petrol, whatever that guidance assumes.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. Lubrication counts more on current diesels, not less, because their fuel runs through finer parts at higher pressure.
One myth that catches motorists off guard: if it starts and drives, it must be unharmed. The motorist of a petrol engine fed diesel usually stops, since it will not run, and the damage stops there. Feed petrol to a diesel and it usually starts, idles and drives away as if nothing has happened — all while its pump is wearing. Being able to run isn't the same as being fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a separate issue. That petrol is still inside the tank after that, and whatever it has thinned isn't put back.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol lies in the fuel filter and lines, waiting to go right back through the pump on your next start. And, a can of petrol filled at the roadside is genuinely hazardous.
Why petrol in a diesel occurs at all
No one does it on purpose, and it is rarely carelessness. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol car at all. The forecourt makes it easy, and the error runs one way.
It occurs when routine and your car stop matching. Any vehicle that is new to you — hired, on loan as a courtesy car, or just bought. One petrol and one diesel on the drive of the same household. A familiar forecourt with the pumps in a different order. Racing for a train at Stallingborough and fuelling up en route. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: precisely when it happens. Add rain, a phone call or a back seat full of children, and the hand does what it has always done.
South End drivers: how to avoid petrol in a diesel next time
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most generally do. Check the petrol pump's label; the colour is only a hint.
- In a car you do not know, look inside the flap over your filler or at the cap before your first fill: plenty of cars print the fuel type there.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of meaning to remember, in a house with one of each.
- Before the nozzle comes off the pump the first time you fill a hired or new vehicle, say "diesel" out loud. Silly, yes, but it does the trick.
- Put your phone away. This is an easy mistake to make whilst you are thinking about something else.
- Add-on devices exist for motors without one, and some diesels come with a filler that won't accept a petrol nozzle. Useful — but a backstop only, never a reason to stop checking the label.
- The moment you realise, stop: less petrol in the tank means a thinner mix. What to do next does not change, though — still don't fire it up.
Already put petrol in a diesel around South End?
Short and simple, then, is the order of things. Leave it unstarted, with your ignition switched off as well. Yet at the forecourt, at JET or anywhere else? Ask the staff to help you push the vehicle clear of the petrol pump. Next, 0333 366 0103. We will ask what got in, roughly how much, and if it has been run.
Corrosion and deposits are the problem with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and see its own South End page.
South End petrol in a diesel tasks: why one costs more than another
Four separate tasks lie behind the four situations above — which is why there's no honest single price. What shifts the cost is chiefly which of them you're in. Where your car is counts too, and whether a technician can safely reach it, after the share of petrol to what your tank takes.
That's why our engineers ask three questions before pricing rather than after: what went in, how much, and if it has run. Those answers are what change a range into one firm number.
About South End itself
South End is a suburban area in Lincolnshire, situated inland at an elevation of 21 metres, with detached housing being the predominant type of accommodation. South End lies approximately 12.6 miles from Kingston upon Hull and is close to nearby places such as Keelby, Riby, and Little London. South End has a population of around 1482 residents and is located in the East Midlands region, about 142.7 miles from London.
Fuel drain cover in South End and across Lincolnshire
Keelby, Riby and Little London are among the locations around South End that the same teams work, answering petrol in diesel jobs across South End's DN postcode area. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots our engineers drain, and the car does not need to move to us.
Still at the pump in South End?
Then you are in the best spot there can be. Leave the car switched off, then ring.