Temple: Petrol in a Diesel Car? How Worried to Be
Provided it has not been started, worry far less than you likely are. "Have I ruined it?" is the first question anyone in Temple asks, and the honest answer is usually no, since petrol left in a diesel tank hurts nothing till it's drawn through the system — by ignition priming, by the starter, or by driving. Petrol in Diesel is who to ring, with your engine kept off, so it remains that way. Below, you will find what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you again.
The engine and petrol in a diesel: what goes on
On its way through a motor, diesel has two jobs. Lubricating comes before burning; it does both. What stops the surfaces inside the high-pressure fuel pump and the injectors from wearing down against each other is your diesel passing through them — they are made to extremely fine clearances.
Of these two tasks, petrol manages the first badly and the second not at all. The knocking comes from petrol being made not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips out the protection your system hinges on, and any pump running on such a blend is wearing itself.
Seen together, they make clear what shape the issue takes. Contact does not do the harm — circulation does. Petrol in a tank is a fuel issue. A pump that has been working on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with the fuel to your injectors downstream.
Petrol in a diesel in Temple: how serious is it? Four situations
The best case there can be: filled up, not once started. Only the tank has petrol in it, and so the job is draining your tank and rinsing the system where the vehicle sits. This scenario can only truly occur on a forecourt: anywhere else, the vehicle got there by being driven.
The ignition switched on, or a brief start. With the system primed, the fuel lines and filter already hold petrol that has come from that tank. Usually little more than emptying, cleaning and sorting the fuel filter, and so still easy.
Those few miles driven meant your pump running on fuel weakened by petrol throughout. Tank, lines, filter, then clean fuel run through the whole system: that's the work, and the way the vehicle was driven counts as much as the distance. Driving the children to St Clement Danes CofE Primary School is one sort of trip. Driving as far as London, under a mile away, makes a very different task — as does any distance on the M1, under 10 miles from Temple, with the engine running hard the whole time.
Driven on till it complained — clattering, smoke, a lumpy idle, a soft throttle. What you are hearing is your motor reporting fuel that no longer behaves like diesel. Pull up on the spot — on the verge on Fountain Court, at the kerb, down a side road — and don't move it. The fuel drain and flush-through still come first, and they sort it out: when a vehicle is stopped quickly, long-term damage is very uncommon.
Stories Temple drivers hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Topping up takes out nothing; it gives you a bigger tank of the same mix. The assumption behind the advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
If anything, the opposite holds. Myth: "A newer diesel can cope with a bit of petrol." Finer components and higher pressure are the way a modern diesel runs its fuel, and that makes the lubrication matter more, not less.
"It starts, it drives, so there is no harm" — the myth that trips up most motorists than any other. Diesel in a petrol motor normally means a motor that won't run: the driver stops, and so does the harm. Feed petrol to a diesel and it normally starts, ticks over and drives away like nothing has happened — all while its pump is wearing. A running engine does not mean fine.
An outdated workaround for a different problem lies behind this one. Myth: "Add some two-stroke oil and drive it home." That petrol is still in your tank after that, and whatever it has thinned isn't put back.
The next start draws petrol back round your pump from the lines and the filter, where some of it sits once the motor has run. That's why a DIY tank drain does not leave you sorted — a myth. It is also truly hazardous to drain petrol into a can at the kerbside.
How does petrol in a diesel occur?
Carelessness is seldom the cause, and no one means to do it. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol car at all. The forecourt makes it simple, and the mistake runs one way.
Habit and your car falling out of step is how it occurs. Courtesy car, hire car, or a car that is new. 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 London Blackfriars with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist used to petrol: precisely when it occurs. With rain, a call arriving, or a car full of children to deal with, your hand just does what it always has.
Next time you fill up in Temple: preventing petrol in a diesel
- Read the pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on each forecourt. The label is what counts.
- Inspect your filler flap. Many cars state the fuel type inside the flap or on the cap. Look at it on your first fill in a car 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 household 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 pump. It seems daft and it works.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away then keep your mind on the pump.
- Add-on devices are available for motors without one, and some diesels come with a filler that will not take a petrol nozzle. Useful — but a backstop at best, never a reason to stop checking the label.
- Stop the moment you notice. Less petrol inside that tank makes a weaker mix. It does not change what to do next, which is still not to start the vehicle.
Temple: already put petrol in a diesel?
The order of things is brief, then. Do not turn your ignition on, and don't fire it up. If you're still at the forecourt — Texaco or anywhere else — ask the attendants to help you push it clear of the pump. Call 0333 366 0103 next, with three facts — your fuel, the approximate volume, and if it's run.
If it was AdBlue instead of petrol, say so. That is a separate issue — corrosion and deposits rather than lost protection — and it has its own page for Temple.
One petrol in a diesel task in Temple costs more than another. Why?
The four situations above are four separate jobs, so no single quote for this would be honest. What moves your cost is chiefly which of them you are in. The proportion counts next, meaning how much of the tank is petrol, followed by the location of the car and whether reaching it is safe for our van.
Three questions come first, before any quote, instead of after — what was put in, how much, has it run — and that is the reason. Given the replies, there is a straight figure rather than a range.
About Temple and where it is
Temple is a small suburban area in central London, situated on the north bank of the River Thames. Temple sits at a low elevation of around 15 metres, close to the heart of the city, and is surrounded by other notable areas such as Aldwych and Blackfriars. Temple is predominantly composed of flat dwellings, reflecting its urban character. Temple is also near Holborn, another major London district.
Temple and Greater London: where our fuel drain cover runs
The teams answering petrol in diesel calls in Temple, in the EC4Y postcode area, equally work the spots around it, Aldwych, Blackfriars and Holborn included. The car does not need to move to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
At the petrol pump around Temple, still?
No position is better: that's where you now are. Switched off it stays; then phone.