How Worried Should You Be? Petrol in a Diesel Car in Compton
Likely less than you are now — provided no one has started the vehicle. Petrol sitting in a diesel tank does nothing to your motor until something draws it through your fuel system — your ignition priming your pump, your starter, or driving on its own. So the honest answer to the first question anyone in Compton asks, "have I wrecked it?", is usually no. To keep the vehicle that way, phone Petrol in Diesel and leave your engine alone. What petrol really does to a diesel, how to gauge how far it has travelled, and how to keep it from happening a second time: that's the remainder of this page.
What petrol in a diesel does to the motor
Passing through a motor, diesel does two things at the same time. It protects to begin with, and after that does it burn. The high-pressure fuel pump and your injectors are built to extremely fine tolerances, and your diesel passing through them is what keeps those surfaces from grinding against each other.
Poorly 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 precisely the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips away the protection your system hinges on, and any pump running on that mixture is wearing itself.
Put these together and the shape of the issue is plain. It's movement that causes the harm, not contact. All a tank with petrol in it amounts to is a fuel problem. The start of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds moves on with your fuel to your injectors downstream.
How serious is petrol in a diesel? Four scenarios we see around Compton
Fuelled but not once started — as good as it gets. Only that tank has petrol in it, and so the task is draining your tank and rinsing the system where the vehicle stands. This scenario can only truly take place at a forecourt: anywhere else, the vehicle got there by being driven.
Your ignition switched on, or a brief start. Once primed, your system has pulled petrol out of that tank up to your filter and your lines. Usually little more than emptying, flushing and seeing to your filter, so still easy.
Driven a couple of miles. Now your pump has spent those miles working on diluted fuel. The work is your tank, the lines, your filter and clean fuel through the entire system, and how hard your car was driven counts as much as how far. The school run to Compton All Saints Church of England Primary School is one matter. Driving as far as Winchester, under 5 miles away, makes a very different task — as does any mileage on the M3, under a mile from Compton, with your engine running hard the whole time.
Driven on till it protested — knocking, smoke, an uneven idle, a dead throttle. The fuel is not behaving like diesel any more, and your engine is saying so. Pull up wherever you are — the verge on Cliff Way, a lay-by, a side street — then leave the vehicle where it is. Long-term damage is very unusual if a vehicle is pulled over soon, and the fuel drain and flush that still go first deal with it.
Petrol in a diesel stories Compton people hear
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing is removed by topping up — you're left with a bigger tank, still the same mix. The assumption behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. Protection counts more on current diesels, not less, since their fuel runs through more precise components at higher pressure.
This is the one that fools drivers. Myth: "If it starts and drives, there is no harm done." Any petrol engine fed diesel usually won't run, so the motorist stops and the harm stops with them. Feed petrol to a diesel and it generally fires up, ticks over and drives away like nothing happened — all the while its pump is wearing. Running does not mean fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a different problem. None of what petrol diluted gets put back by it — and later, that tank still contains the petrol.
The next start draws petrol back round your pump from your lines and your filter, where some of it sits after your engine has run. That is why draining your tank yourself doesn't leave you sorted — a myth. It's also genuinely dangerous to drain petrol into a can by the kerbside.
How does petrol in a diesel take place?
On purpose? Never. Through carelessness? Rarely, if ever. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol vehicle at all. The forecourt makes it simple, and the mistake runs one way.
Routine and your car falling out of step is when it takes place. A new vehicle, a hire car or a courtesy car. A household with one petrol and one diesel on the drive. The pumps in a different order on a familiar forecourt. A train to catch, and a rushed fill on the way to Shawford. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it takes place. Add rain, a phone call or a back seat full of children, and your hand repeats what it has always done.
Compton drivers: how to avoid petrol in a diesel next time
- Green for unleaded and black for diesel is usual in the UK — yet not on each forecourt. Trust the label on the petrol pump, not the colour.
- Check the filler flap. Many motors state the fuel inside the flap or on the cap. Look at it on your first fill in a motor you don't know.
- Label your key. In a house 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 sounds daft and it works: on your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Tuck your phone away. This is an easy mistake to make while you're thinking about something else.
- Add-on devices exist for vehicles without one, and some diesels come with a filler that won't take a petrol nozzle. Useful — but a safety net at best, never a reason to stop checking the label.
- The moment you notice, stop: less petrol in the tank makes a weaker mixture. What to do next doesn't change, though — still don't crank it.
Already put petrol in a diesel in Compton?
Then the order of things is brief. Don't turn your ignition on, and don't crank it. Still on the forecourt, at Sainsbury's or anywhere else? Ask the staff to help you push the car away from the petrol pump. What got in, about how much, and whether it's run: tell us that when you phone 0333 366 0103.
If it was AdBlue rather than petrol, say so. That's a separate issue — corrosion and deposits instead of lost protection — and it has its own page for Compton.
Why one petrol in a diesel job in Compton costs more than another
Four different tasks lie behind the four situations above — which is why there's no fair single price. The situation itself does most of the work of moving the cost. The share counts next, meaning how much of the tank is petrol, and then the position of the vehicle and whether reaching it is safe for a van.
Three queries come first, before any quote, instead of after — what got in, how much, has it run — and this is the reason. A range becomes a straight figure once those replies are in.
About Compton
Compton is a village situated on the River Itchen in Hampshire, with a mix of old and new buildings, including many detached homes. Compton lies near the city of Winchester, about 3 miles to the south, and is surrounded by other small villages such as Shawford and Compton End. Compton has a population of around 799 people and is located at an elevation of approximately 70 metres above sea level. Compton is also relatively close to London, being about 62 miles to the southwest.
Compton and Hampshire: where our fuel drain cover reaches
Compton waits in the SO postcode area, and the teams that answer petrol in diesel jobs there work the spots around it as well — South Down, Shawford and Compton End among them. Our engineers drain where your vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
At the petrol pump around Compton, still?
The best position there is, then — that's where you are. Keep it off. Call.