Should You Worry? Petrol in a Diesel Car in Basted
Far less than you probably are, if it has not been started. Everyone around Basted starts with "have I ruined it?", and the fair answer is normally no: petrol resting in your tank of any diesel stays harmless until priming, cranking or driving draws it into your fuel system. To leave the vehicle that way, phone Petrol in Diesel and leave your engine alone. Read on for three things: the effect petrol has inside a diesel engine, the signs of how far it has spread, and the way to make sure you don't do it again.
Inside the engine: what petrol in a diesel does
Diesel does two jobs on its way through an engine. Lubricating comes before burning; it does both. What keeps the surfaces inside the high-pressure pump and the injectors from grinding against each other is the diesel passing through them — they're designed to very fine gaps.
Of these two jobs, petrol handles the first badly and the second not at all. A pump running on a petrol mixture is wearing itself out, because petrol is thinner than diesel and strips out the protection the fuel system depends on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that's where the knocking comes.
Combined, those make the shape of the problem plain. The damage is done by movement, not by contact. Where that petrol is only inside that tank, it's a fault of fuel, nothing more. Whatever a worn pump sheds goes on, carried by your fuel, into the fuel injectors downstream, which is why a pump that has been working on the petrol is where a mechanical problem begins.
Petrol in a diesel in Basted: how bad is it? Four cases
Filled up, never started. The best case there is. Only the tank has petrol in it, and so the task is draining that tank and purging the system where the car stands. This situation can only really occur on a forecourt: anywhere else, the car got there by being driven.
Ignition on, or started for a moment. The fuel system has been primed, so petrol has left your tank and got to the fuel filter and your lines. Drain, flush, deal with the filter: still normally easy.
Those few miles on the road were the pump running on fuel diluted by petrol throughout. How hard the vehicle was driven matters as much as how far, and this work covers your tank, the lines, the fuel filter and fresh fuel through the entire system. Short trips, such as the school run to Borough Green Primary School, are one thing. Very different again: a run to London, under 25 miles away, or some mileage on the M26, under 3 miles from Basted, where the motor never stopped working hard.
Driven until it complained. Knocking, a ragged idle, smoke, a throttle that has gone soft. What you are hearing is your motor reporting fuel that no longer runs like diesel. Pull up wherever you are — the verge on Mill Lane, a lay-by, a side street — and leave the car where it is. What goes first is still the fuel drain and flush-through, and that deals with it, with long-term damage very uncommon when a car is pulled over soon.
What Basted motorists get told about petrol in a diesel — and the myths in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." A fuller tank of the same mix is all it gives, since topping up takes out nothing. The assumption behind the guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
If anything, the opposite is true. Myth: "A modern diesel can cope with a bit of petrol." Lubrication matters more on modern diesels, not less, since their fuel passes through smaller components at higher pressure.
"It starts, it drives, and so there is no harm" — the myth that trips up most motorists than any other. The motorist of a petrol motor fed diesel normally stops, because it will not run, and the damage stops with them. A diesel fed petrol usually starts, ticks over and drives away as though nothing has happened, while your pump wears. Fine and running aren't the same at all.
An old fix for a different problem lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." It doesn't put back what petrol has diluted, and that petrol is still in your tank after that.
"Drain it yourself and you're sorted" — a myth, since after it's been running some petrol lies in the fuel filter and lines, ready to go straight back through your pump at your next start. Clearing petrol into a can at the roadside is also genuinely risky.
How petrol ends up: petrol in a diesel
No one does it on purpose, and it is seldom carelessness. One way only, because of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol car. That is how the forecourt makes it straightforward.
The moment routine stops matching the vehicle is the moment it occurs. A car that is new to you — a hire car, on loan as a courtesy car, or just bought. Households running one of each, petrol and diesel. A familiar forecourt with the pumps in a different order. A hurried fill on the way to Borough Green & Wrotham with a train to catch. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it occurs. Throw in rain, a phone call or a back seat full of kids, and the hand does what it has always done.
How to prevent petrol in a diesel at your next fill-up in Basted
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Read the pump's label; the colour is just a hint.
- Check your filler flap. Plenty of cars state the fuel inside the flap or on the cap. Look at it on the first fill in any vehicle you do not know.
- A coloured fob or a sticker on the diesel's key does more than any amount of intending to remember, for a house with one of each.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump. It sounds silly and it works.
- Put the phone away. This is an easy mistake to make while you're thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject a petrol nozzle, and add-on devices exist for vehicles without one. They are a safety net, not a reason to stop reading the petrol pump.
- Less petrol means a thinner blend, and so stop the moment you realise — though remembering that your next step is unchanged. It is still not to start the vehicle.
Basted: already put petrol in a diesel?
Short and simple, then, is the order of things. Never crank it, and do not turn the ignition on. Still on the forecourt, at Esso or anywhere else? Ask the attendants to help you push the vehicle clear of the petrol pump. Next, 0333 366 0103. We will ask what was put in, roughly how much, and if it's been run.
Corrosion and deposits form the problem with AdBlue, where petrol means lost lubrication. So if it was AdBlue, say so — and see its own Basted page.
Why one petrol in a diesel task in Basted costs more than another
There's no fair single price for this, because the four situations above are four different tasks. Chiefly, your cost shifts with which one you're in. Two things come after that: the petrol that went in as a share of what that tank takes, then the place the car is in and whether a van can get to it safely.
Three queries come first, before quoting, instead of after — what was put in, how much, has it run — and this is the reason. With those replies, you get a straight figure rather than a range.
About Basted itself
Basted is a small village in Kent, situated on the banks of a river at an elevation of 62 metres. Basted lies within the commuter belt of London, approximately 24 miles from the city centre. Basted has a mix of housing types, but semi-detached homes are the most common, and the village is near other small settlements like Claygate Cross and Crouch. Basted remains a relatively small community with a population of around 578 residents.
Fuel drain cover across Kent, Basted included
Our vans answering petrol in diesel jobs around Basted, in the TN postcode area, also work the places around it, Claygate Cross, Crouch and Ightham included. A forecourt, a supermarket car park, a lay-by or your own driveway are all places our engineers work, and the car does not need to come to us.
At the pump in Basted, right now?
In that case, you could not be in a better spot. Keep it off. Call.