Should You Worry? Petrol in a Diesel Car in Witheridge
Provided it hasn't been started, worry less than you likely are. Everyone around Witheridge begins with "have I wrecked it?", and the honest answer is usually no: petrol left inside your tank of a diesel remains harmless until priming, cranking or driving pulls it into your fuel system. Petrol in Diesel is who to ring, with the engine kept off, and so it remains that way. Read on for three things: the effect petrol has inside a diesel motor, the signs of how far it has got, and the way to make sure you don't do it again.
Petrol in a diesel: what does it do to the motor?
Diesel does two jobs on its way through an engine. Before it combusts, it lubricates — and then it burns. Your high-pressure pump and your injectors are made to very fine tolerances, and your diesel passing through them is what stops those surfaces from wearing down against each other.
The second job petrol does not do at all, and the first it does poorly. 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 runnier than diesel, it strips out the protection your system hinges on, and any pump working on that blend is wearing itself.
Together, those leave the shape of the issue plain. The damage is done by movement, not by contact. Petrol in the tank is a fuel problem. The beginning of a mechanical problem is a pump that has been labouring on that petrol — and whatever a worn pump sheds travels on with your fuel to the injectors downstream.
Witheridge, petrol in a diesel: four cases, from mild to major
Fuelled, and never started: no case is better. The petrol is in the tank and just that tank, and the task is a drain and a flush where the vehicle stands. This is the one scenario that can only really occur on a forecourt, since anywhere else the car has been driven to get there.
The ignition turned on, or a brief start. The system has been bled, and so petrol has left that tank and reached the filter and the lines. That's normally still a straightforward task — a drain, a flush, and your filter dealt with.
Those few miles on the road meant your pump labouring on fuel weakened by petrol throughout. Distance is only half of that; how hard it was driven counts just as much. Either way this work includes your tank, your lines, the filter and clean fuel through the entire circuit. A school run to Witheridge Church of England Primary Academy is one matter. Driving as far as Exeter, under 25 miles away, makes a very different task — as does any mileage on the M5, under 15 miles from Witheridge, with your engine working hard the whole time.
Driven on until it protested — knocking, smoke, a lumpy idle, a dead throttle. The engine is telling you your fuel is no longer acting like diesel. Whether it's the verge on West Street, a lay-by or a side road, stop where you are then leave it. What goes first is still the drain and flush-through, and that sorts it out, with permanent damage very uncommon when a vehicle is stopped early.
What Witheridge people get told about petrol in a diesel — and the myths in it
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing is removed by topping up — you are left with a fuller tank, still the same mixture. A diesel fuel system does not tolerate petrol by percentage in the way that advice presumes.
"Newer diesels can handle a little petrol" — a myth, and closer to the opposite. A modern diesel sends its fuel through finer parts at higher pressure, which makes the lubrication count more, not less.
The myth that catches people off guard: if it starts and drives, it must be unharmed. Any petrol motor fed diesel generally won't run, and so the motorist stops and the damage stops with them. A diesel fed petrol normally starts, idles and drives away as if nothing has happened, while the pump wears. Being able to run is not proof of being fine.
An outdated fix for a different problem lies behind this one. Myth: "Add some two-stroke oil and drive it home." What petrol has weakened remains thinned, and that petrol remains in your tank anyway.
"Drain it yourself and you are sorted" — a myth, because after it has been running some petrol sits in your filter and lines, waiting to go straight back through the pump on your next start. Emptying petrol into a can at the kerbside is also truly dangerous.
Why petrol in a diesel occurs at all
A careless moment is seldom the cause, and no one means to do it. A diesel nozzle mostly won't go into a petrol vehicle, yet the slimmer petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error straightforward, and just in one direction.
It occurs when habit and the car stop matching. A new vehicle, a hire car or a courtesy car. Two cars on one driveway, one petrol, one diesel. Your normal forecourt, its pumps now in a different order. A rushed fill on the way to Lapford with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist used to petrol: precisely when it takes place. Add rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
Next time you fill up in Witheridge: avoiding petrol in a diesel
- A green handle for unleaded and black for diesel is usual in the UK — yet not on every forecourt. Go by the label on the petrol pump, not the colour.
- Inspect the filler flap. Plenty of cars state the fuel inside the flap or on the cap. Look at it on the first fill in any motor you don't know.
- Label the key. In a household with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- "Diesel", out loud, before you lift the nozzle — every time a new or hired car needs its first tank. It sounds daft. It works.
- Tuck the phone away. This is an easy mistake to make while you're thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to block a petrol nozzle, and aftermarket devices are available for the remainder. Treat it as a backstop, and keep checking the pump.
- Less petrol means a thinner mixture, and so stop as soon as you notice — while remembering that your next step is unchanged. It is still not to crank it.
Witheridge: already put petrol in a diesel?
In that case, there is only a short order of things. Do not fire it up, and don't switch the ignition on. The staff on the forecourt — whether at the nearest petrol station itself or wherever you filled up — will normally help push it clear of the pump if you ask. Next, 0333 366 0103. We will ask what was put in, about how much, and if it has been run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a separate issue — Witheridge has a page just for it.
Witheridge petrol in a diesel jobs: why one costs more than another
An honest single quote does not exist here: four scenarios, four separate jobs. Mostly, your cost shifts with which one you are in. The proportion counts next, meaning how much of that tank is petrol, and then the location of your car and whether getting to it is safe for a technician.
That is why we ask three queries before quoting instead of after: what got in, how much, and if it has run. Those answers change a range into a straight figure.
About Witheridge and its setting
Witheridge is a village in Devon, situated on the River Taw and surrounded by rolling hills, with Stretch Down and Drayford nearby. Witheridge sits at an elevation of 188 metres, approximately 15 miles from Exeter, and is characterized by its semi-detached housing. Witheridge has a population of around 1306 residents, who live in a rural setting with easy access to the city of Exeter. Witheridge is located in the South West region of England, about 160 miles from London.
Witheridge and Devon: where our fuel drain cover reaches
Our vans answering petrol in diesel calls around Witheridge, in the EX postcode area, equally work the locations around it, Stretch Down, Drayford and Washford Pyne among them. You need not move your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all locations we drain.
In Witheridge and still at the petrol pump?
No position is better: that's where you now are. Call, and keep it turned off.