Petrol in a Diesel Car in Troqueer: How Worried Should You Be?
Not started? Then less worried than you probably feel. Everyone in Troqueer begins with "have I ruined it?", and the honest answer is usually no: petrol left in your tank of a diesel remains harmless till priming, cranking or driving pulls it into your fuel system. Leave your motor off and call Petrol in Diesel — that is how you keep it that way. Below, you will find what petrol really does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
Inside your engine: what petrol in a diesel really does
Diesel has two tasks on its way through an engine. Before it ignites, it protects — and then it burns. Designed to very fine tolerances, the injectors and the pump depend on your diesel flowing through them to keep their surfaces from wearing against one another.
Of those two tasks, petrol handles the first poorly and the second not at all. The knocking comes from petrol being designed not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection the fuel system hinges on, and any pump running on that mixture is wearing itself.
Seen together, they make clear the shape the trouble has. Contact doesn't do the harm — circulation does. Any tank with petrol in it is a fuel problem. Whatever a worn pump sheds travels on, carried by the fuel, into the injectors downstream, which is why a pump that has been working on that petrol is where a mechanical fault starts.
Petrol in a diesel around Troqueer: how serious is it? Four situations
Fuelled up, never 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 inside the tank alone, it's drained and flushed right where it stands, and nothing more is needed.
Started for a moment, or just the ignition on. With the system primed, the lines and filter now hold petrol that has come from your tank. Still usually simple: drain, flush, and the fuel filter seen to.
Driven a few miles. Now the pump has spent those miles working on weakened fuel. The work is the tank, the fuel lines, the fuel filter and fresh fuel through the whole system, and how hard the car was driven matters as much as how far. Driving the children to the local primary school is one sort of trip. Driving as far as Carlisle, under 50 miles away, makes a very different task — as does any mileage on the A74(M), under 15 miles from Troqueer, with the engine running hard all the way.
Rattling, a ragged idle, smoke, a throttle gone soft: driven until it complained. The engine is telling you the fuel is no longer behaving like diesel. Stop on the spot — on the verge on Suspension Brae, at the kerb, down a side road — and do not move it. Long-term damage is very unusual when a vehicle is pulled over early, and the drain and flush that still come first deal with it.
What Troqueer people 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'll be." Topping up takes out nothing; it gives you a fuller tank of the same mixture. A diesel fuel system doesn't accept petrol by percentage in the way that advice supposes.
Not so: a modern diesel copes with a bit of petrol. Rather, the reverse. At higher pressure, through more precise parts: that is how a current diesel moves its fuel, so the lubrication counts more, not less.
This is the one that catches drivers. Myth: "If it starts and drives, there is no damage done." Diesel in a petrol motor usually means a motor that won't run: the driver stops, and so does the harm. A diesel fed petrol normally starts, ticks over and drives away as though nothing has happened, whilst the pump wears. Being able to run isn't the same as being fine.
An outdated workaround for a distinct problem lies behind this one. Myth: "Add some two-stroke oil and drive the car home." None of what petrol diluted is put back by it — and afterwards, the tank still holds the petrol.
Once your engine has run, part of the petrol sits in the filter and the fuel lines, not that tank — and the next start pulls it right back through your pump. So the myth "drain your tank yourself and you're sorted" doesn't stand up. And, a can of petrol filled by the roadside is truly dangerous.
How it happens: petrol in a diesel
On purpose? Never. Through carelessness? Seldom, if ever. One way only, since of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, while the diesel one mostly won't fit a petrol vehicle. That's how the forecourt makes it easy.
It happens when routine and the vehicle stop matching. A car that is new to you — hired, on loan as a courtesy car, or just bought. Two motors on one driveway, one petrol, one diesel. A forecourt you know, but with its pumps laid out differently. A rushed fill on the way to Dumfries with a train to catch. A new-to-you diesel Renault Megane, its first fuelling, and a driver used to petrol: precisely when it occurs. With rain, a call coming in, or a car full of children to deal with, your hand simply does what it has always done.
Avoiding petrol in a diesel next time you fill up around Troqueer
- Check the pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on each forecourt. The label is what counts.
- Plenty of motors state the fuel type inside the filler flap or on the cap, and so check it on the first fill in a vehicle you don't know.
- Good intentions count for less than a sticker or a fob in a vivid colour on your diesel's key if a home has one of each. So label it.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It sounds silly and it works.
- Whilst you're thinking about something else, this is an easy mistake to make — so put the phone away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler built to block a petrol nozzle, and add-on devices exist for cars without one. They are a backstop, not a reason to stop reading the petrol pump.
- Less petrol makes a thinner mixture, and so stop the moment you notice — while remembering that the next stage is unchanged. It is still not to fire it up.
Already put petrol in a diesel in Troqueer?
Then the order of things is short. Do not turn your ignition on, and don't crank it. If you are still at the forecourt — BP or anywhere else — ask the staff to help you roll the car away from the petrol pump. What was put in, roughly how much, and whether it has run: tell us those when you phone 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a separate issue — Troqueer has a page just for it.
What makes one Troqueer petrol in a diesel job cost more than the next
There is no fair single price for this, since the four scenarios above are four separate jobs. Which of them you're in is mostly what moves your cost. Two things come after that: the petrol that went in as a share of what that tank holds, then the place the vehicle is in and whether a van can get to it safely.
Before any quote, not after, we ask three questions: the fuel that was put in, the amount, and if it has run. That's why. Their answers are what turn a range into one firm number.
About Troqueer and where it is
Troqueer is a suburban area situated on the riverside in Dumfries and Galloway, with a mix of flat housing and local amenities. Troqueer sits at an elevation of 23 metres, close to the nearby settlements of Maxwelltown and Dumfries. Troqueer is located near the town of Laurieknowe and is approximately 29 miles from the city of Carlisle. Troqueer has a population of around 5105 residents.
Troqueer and Dumfries and Galloway: where our fuel drain cover runs
Troqueer waits in the DG postcode area, and our vans that answer petrol in diesel jobs there work the spots around it as well — Maxwelltown, Dumfries and Laurieknowe among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations our engineers work, and your car doesn't need to come to us.
Still at the pump around Troqueer?
The best position there is, then — that's where you are. Phone, and leave it switched off.