Petrol in a Diesel Car in Anthill Common: How Worried Should You Be?
If it has not been started, you can worry less than you probably are. Everyone around Anthill Common starts with "have I wrecked it?", and the honest answer is usually no: petrol left in your tank of any diesel remains harmless until priming, cranking or driving pulls it into the system. Leave the engine off then ring Petrol in Diesel — that keeps it like that. Further down, you will find what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you a second time.
Inside the engine: what petrol in a diesel does
Passing through a motor, diesel does two jobs at the same time. Before it ignites, it lubricates — and then it ignites. Built to very fine gaps, your injectors and the pump depend on the diesel moving 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 clattering comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips out the protection the system rests on, and any pump running on that mixture is wearing itself.
Seen together, they show what shape the issue has. Not contact but circulation is what does the damage. Petrol in the tank is a fuel problem. Whatever a worn pump sheds travels on, borne by the fuel, into your injectors further along, which is why a pump that has been working on that petrol is where a mechanical issue begins.
Petrol in a diesel in Anthill Common: how bad is it? Four situations
Fuelled but not once started — as good as it gets. The petrol is inside the tank and just the tank, and the job is a drain and a flush where the car sits. This is the one scenario that can only truly take place at a forecourt, since anywhere else the car has been driven to get there.
Ignition on, or started for a second. Petrol has left the tank and got to your filter and the fuel lines, because the fuel system has been bled. Usually nothing more than emptying, flushing and sorting your filter, and so still easy.
Your pump now worked a couple of miles on diluted fuel — that is what driving the car meant. Tank, lines, filter, then clean fuel run through the entire system: that is this work, and the way the vehicle was driven counts as much as the mileage. On the school run to Denmead Infant School, the distance is short. Very different once more: a run to Portsmouth, under 10 miles away, or some miles on the A3(M), under 5 miles from Anthill Common, where your engine kept running hard.
Clattering, a ragged idle, smoke, a throttle gone soft: driven until it complained. What you are hearing is the motor reporting fuel that no longer runs like diesel. Pull up on the spot — on the verge on Uplands Road, at the kerb, down a side road — and do not move it again. A car pulled over early very seldom has lasting damage, because the drain and the flush-through, which still come first, take care of it.
Anthill Common people and the petrol in a diesel myths they hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing is removed by topping up — you are left with a bigger tank, still the same mixture. That guidance supposes a diesel fuel system tolerates petrol by percentage. It does not.
Myth: a modern diesel copes with a bit of petrol. Rather, the opposite. A current diesel sends its fuel through smaller parts at higher pressure, which makes the protection matter more, not less.
This is the one that fools people. Myth: "If it starts and drives, there is no harm done." Diesel in a petrol motor generally leaves a motor that won't run: the motorist stops, and so does the damage. A diesel fed petrol normally starts, idles and drives away as though nothing has happened, while your pump grinds. Fine and running aren't the same at all.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate issue. That petrol is still in your tank afterwards, and what it has weakened is not put back.
"Drain it yourself and you are sorted" — a myth, because after it has been running some petrol sits in the fuel filter and lines, waiting to go straight back through your pump at the next start. Clearing petrol into a can at the kerbside is also really risky.
How petrol ends up: petrol in a diesel
It's rarely carelessness, and nobody does it on purpose. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle mostly will not go into a petrol car at all. So the slip runs one way.
Routine and your car getting out of step is how it takes place. Courtesy car, hire car, or a car that is brand new. A household with one petrol and one diesel on the driveway. Your ordinary forecourt, its pumps now in a different order. Fuelling up in a rush on the way to Portchester, with a train to catch. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is exactly the moment it takes place. With rain, a call arriving, or a car full of children to deal with, the hand just does what it has always done.
How to avoid petrol in a diesel on your next fill-up in Anthill Common
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most usually do. Check the petrol pump's label; the colour is only a clue.
- In a vehicle you don't know, look inside the flap over your filler or at the cap before your first fill: many motors state the fuel there.
- One of each in the household? Mark the key to the diesel — a coloured fob, a sticker — since meaning to remember is not enough.
- "Diesel", aloud, before you pick up the nozzle — every time a new or hired car needs its first tank. It sounds daft. It works.
- Mistakes like this are straightforward to make whilst your mind is on something else, and so the phone goes away.
- Add-on devices are available for motors without one, and some diesels come with a filler that won't take a petrol nozzle. Useful — but a safety net only, never a reason to stop checking the label.
- Less petrol makes a thinner mix, so stop as soon as you notice — though remembering that the next stage is unchanged. It is still not to crank it.
Put petrol in a diesel in Anthill Common already?
In that case, there is just a short order of things. Do not start it, and do not turn the ignition on. Yet at the forecourt, at BP or anywhere else? Ask the staff to help you roll it away from the pump. Then ring 0333 366 0103 and tell us what was put in, about how much, and if it's run.
Corrosion and deposits form the problem with AdBlue, where petrol brings lost lubrication. So if it was AdBlue, say so — and read its own Anthill Common page.
Why one petrol in a diesel task around Anthill Common costs more than another
There's no fair single price for this, because the four situations above are four separate jobs. Which of them you are in is chiefly what moves the cost. Where your car is matters too, and whether a technician can safely get to it, after the share of petrol to what that tank holds.
That's why we ask three questions before pricing instead of after: what was put in, how much, and if it has run. With those answers, there is a straight figure rather than a range.
About Anthill Common itself
Anthill Common is a suburban area in Hampshire, situated near the River Hamble and close to the cities of Portsmouth and Southampton. Anthill Common has a relatively low elevation of 64 metres and is surrounded by other residential areas, including Denmead and Worlds End. Anthill Common is characterized by its predominantly detached housing stock, reflecting its suburban nature. Anthill Common is also within commuting distance of London, being approximately 58.5 miles away.
Anthill Common and Hampshire: where our fuel drain cover reaches
The teams answering petrol in diesel call-outs in Anthill Common, in the PO postcode area, also work the places near it, Denmead, Worlds End and Hoe Gate included. Our engineers drain where your car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
In Anthill Common and still at the petrol pump?
No position is better: that's where you are. Leave the car switched off, then ring.