East Calder: Petrol in a Diesel Car? How Worried to Be
Less than you probably are, if it has not been started. Till the ignition primes the pump, your starter cranks, or your vehicle is driven, petrol in a diesel tank just waits there and does no harm. Which means the honest reply to that first East Calder query — "have I ruined it?" — normally no. Petrol in Diesel is who to ring, with the motor left off, and so it stays that way. Read on for three things: the effect petrol has inside a diesel motor, the clues of how far it has got, and ways to make sure you don't repeat it.
Petrol in a diesel: what does it do to your engine?
Passing through an engine, diesel does two things at the same time. Before it ignites, it protects — and then it ignites. What stops the surfaces inside your high-pressure pump and your injectors from wearing down against each other is the diesel passing through them — they're made to extremely fine gaps.
The second job petrol does not do at all, and the first it does badly. A pump working on a petrol mixture is wearing itself out, since petrol is runnier than diesel and takes away the protection your fuel system depends on. Petrol is also made to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that's where the clattering starts.
Put those together and the shape of the problem is plain. Contact does not do the damage — movement does. Where the petrol is only inside the tank, it is a fault of fuel, nothing more. The beginning of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with your fuel to the injectors beyond it.
East Calder, petrol in a diesel: four situations, from mild to significant
Filled but not once started — the best it gets. Being on a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With that petrol kept in the tank alone, it is cleared and flushed on the spot, and nothing more is needed.
Started for a second, or just the ignition on. With the fuel system primed, the lines and filter now contain petrol that came from that tank. Usually nothing more than draining, flushing and sorting your filter, so still simple.
Driven a couple of miles. Now the pump has spent these miles labouring on weakened fuel. Tank, lines, filter, then fresh fuel put through the entire circuit: that is this work, and the way the vehicle was driven counts as much as the mileage. Short trips, such as the school run to the local primary school, are one thing. A run as far as Edinburgh, under 15 miles away, is a very different task. So is any distance on the M8, under 3 miles from East Calder, where the engine has been labouring hard the whole time.
It protested, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone uneven. The engine is telling you your fuel is no longer behaving like diesel. Whether it's the verge on Main Street, a lay-by or a side street, stop where you are and leave it. Lasting damage is very rare when a car is pulled over quickly, and the drain and flush that still go first deal with it.
East Calder motorists and the petrol in a diesel stories they hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up removes nothing; it gives you a bigger tank of the same mix. The idea behind that advice — that diesel fuel systems accept petrol by percentage — is wrong.
If anything, the reverse holds. Myth: "A newer diesel can cope with a bit of petrol." More precise components and higher pressure are the way a newer diesel runs its fuel, and that makes the protection matter more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that catches motorists. Diesel in a petrol motor usually means a motor that won't run: the motorist stops, and so does the harm. Feed petrol to a diesel and it normally fires up, idles and drives away as if nothing has happened — all while its pump wears. Running does not mean fine.
Myth: "Add some two-stroke oil and drive it home." It is an old fix for a different fault. The petrol is still inside your tank after that, and whatever it has thinned isn't put back.
The next start sends petrol back round your pump out of the fuel lines and your filter, where some of it ends up after the motor has been run. That's why draining your tank yourself doesn't sort it — a myth. It's also genuinely risky to drain petrol into a can by the roadside.
Petrol in a diesel: how does it take place?
On purpose? Never. Through carelessness? Seldom, if ever. The forecourt makes it simple: the petrol nozzle is the smaller of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle mostly won't go into a petrol vehicle at all. So the mistake runs one way.
Habit and the car getting out of step is how it happens. A new motor, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. Your ordinary forecourt, its pumps suddenly in a different order. A rushed fill on the way to Kirknewton with a train to catch. Precisely the moment it happens: after years of driving petrol, someone fills a diesel Volkswagen Passat for the first time. Add rain, a phone call or a back seat full of kids, and the hand does what it has always done.
East Calder people: how to prevent petrol in a diesel next time
- Check the pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on every forecourt. The label is what matters.
- Plenty of cars state the fuel inside your filler flap or on the cap, and so check it on your first fill in a car you don't know.
- A coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember, for a home with one of each.
- It sounds silly and it works: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck your phone away then keep your mind on the pump.
- Add-on devices exist for cars without one, and some diesels are built with a filler that won't accept a petrol nozzle. Useful — but a backstop only, never a reason to stop checking the label.
- Noticing it mid-fill? Stop there and then. A thinner mix follows from less petrol inside your tank, yet your next step stays the same: do not crank it.
Already put petrol in a diesel around East Calder?
In that case, there's just a short order of things. Starting it is out, and so is switching on the ignition. If you are still at the forecourt — Shell or anywhere else — ask the attendants to help you roll it away from the petrol pump. What was put in, roughly how much, and if it has run: tell us those when you ring 0333 366 0103.
Corrosion and deposits are the problem with AdBlue, where petrol brings lost protection. So if it was AdBlue, say so — and read its own East Calder page.
Why one petrol in a diesel task around East Calder costs more than another
Four separate tasks lie behind the four situations above — which is why there is no honest single quote. The scenario itself does most of the work of moving your cost. The share matters next, meaning how much of your tank is petrol, followed by the position of the car and whether reaching it is safe for a technician.
Ahead of any quote, not after, we ask three questions: the fuel that was put in, the amount, and if it's run. That's why. Those answers are what turn a range into one firm number.
About East Calder and its setting
East Calder is a village situated on the banks of the River Almond in West Lothian, with a mix of terraced housing and a population of around 1292 residents. East Calder sits at an elevation of 113 metres, approximately 11 miles west of Edinburgh, and is close to neighbouring communities such as Calderhall and Mid Calder. East Calder's riverside setting provides a scenic backdrop to the village, which is located near the larger town of Livingston but retains its own distinct character. East Calder is also relatively distant from major English cities, being around 332 miles from London.
Fuel drain cover across West Lothian, East Calder included
East Calder rests in the EH postcode area, and the teams that answer petrol in diesel call-outs there work the spots around it as well — Calderhall, Langton and Mid Calder among them. A forecourt, a supermarket car park, a lay-by or your own drive are all locations we work, and your vehicle does not need to move to us.
At the petrol pump around East Calder, right now?
Then, you could not be in a better place. Turned off it remains; then call.