Petrol in a Diesel Car in Creetown: How Worried Should You Be?
Likely less than you already are — as long as nobody has started the vehicle. Everyone around Creetown starts with "have I ruined it?", and the honest answer is usually no: petrol left inside your tank of any diesel remains harmless until priming, cranking or driving pulls it into the fuel system. Leave the motor off then phone Petrol in Diesel — that is how you keep it that way. Read on for three things: the effect petrol has inside a diesel engine, the signs of how far it has got, and the way to make sure you never do it again.
Your engine and petrol in a diesel: what happens
Passing through a motor, diesel does two things at the same time. It ignites, and before it combusts it lubricates. Very fine tolerances go into your injectors and your high-pressure pump, and only your diesel flowing through stops those surfaces grinding together.
Petrol does the first job badly and the second not at all. A pump working on a petrol mixture is wearing itself out, because petrol is runnier than diesel and takes away the lubrication your fuel system relies on. Petrol is also made to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that is where the knocking comes.
Put these together and the shape of the problem is plain. Contact doesn't do the harm — circulation does. Petrol in a tank is a fuel problem. Whatever a worn pump sheds travels on, carried by the fuel, into the injectors further along, which is why a pump that has been working on the petrol is where a mechanical issue begins.
Four situations we see around Creetown: how bad is petrol in a diesel?
The best case there is: filled up, never started. Being on a forecourt is what makes this the case: elsewhere, the car has been driven there to begin with. With that petrol held in the tank alone, it is cleared and cleaned on the spot, and nothing more is needed.
The ignition turned on, or a short start. Once primed, the system has pulled petrol from your tank as far as the filter and the lines. That is normally still a simple task — a drain, a flush, and the filter dealt with.
A few miles driven, and the pump has spent each of them running on thinned fuel. Tank, lines, filter, then fresh fuel put through the whole system: that is this work, and the way the car was driven counts as much as the mileage. A school run to the local primary school is one thing. Driving as far as Carlisle, over 50 miles away, makes a very different job — as does any mileage on the A74(M), under 50 miles from Creetown, with the motor working hard the whole time.
Rattling, a ragged idle, smoke, a throttle gone soft: driven till it complained. That's your motor telling you its fuel has stopped acting like diesel. Pull up wherever you are — the verge on High Street, a lay-by, a side street — then leave it where it is. The drain and flush still come first, and they sort it out: if a vehicle is stopped soon, permanent damage is very unusual.
What Creetown motorists get told about petrol in a diesel — and the myths in it
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing is removed when you top up — your tank simply holds more of the same mixture. Percentage isn't how a diesel fuel system tolerates petrol, whatever that advice supposes.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. Lubrication counts more on current diesels, not less, because their fuel passes through smaller parts at higher pressure.
Myth: "If it starts and drives, there is no harm done." This is the one that catches people. Feed diesel to a petrol engine and it normally will not run, so the driver stops — and the damage stops with them. Whilst the pump wears, a diesel fed petrol normally starts, ticks over and drives away as though nothing has happened. Running isn't the same as fine.
Not so: a two-stroke additive lets you to drive home. It is an old fix, meant for another fault. What petrol has weakened remains weakened, and that petrol remains in that tank regardless.
If the motor has run, part of that petrol sits in the filter and the fuel lines, not the tank — and your next start sends it right back through your pump. So the myth "drain your tank yourself and you're sorted" doesn't stand up. Emptying petrol into a can at the roadside is also really hazardous.
Why petrol in a diesel happens at all
No one does it on purpose, and it is rarely carelessness. A diesel nozzle generally will not go into a petrol motor, yet the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake simple, and only in that direction.
Routine and the vehicle getting out of step is when it takes place. A new vehicle, a hire car or a courtesy car. A household with one petrol and one diesel on the driveway. The pumps in a different order on a familiar forecourt. A rushed fill on the way to the nearest station with a train to catch. Exactly the moment it takes place: after years of driving petrol, a driver fills a diesel BMW 3 Series for the first time. With rain, a call coming in, or children to deal with, the hand just does what it has always done.
Preventing petrol in a diesel next time you fill up around Creetown
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most usually do. Check the pump's label; the colour is only a hint.
- Inspect your filler flap. Plenty of motors state the fuel inside the flap or on the cap. Look at it on the first fill in a vehicle you do not know.
- Label your key. In a household with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- Before the nozzle leaves the pump the first time you fill a hired or new motor, say "diesel" out loud. Silly, perhaps, yet it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, and so put the phone away then keep your mind on the pump.
- Some diesels have a filler designed to reject a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the petrol pump.
- Spotting it halfway? Stop there and then. A thinner blend follows from less petrol inside the tank, but the next step remains the same: do not fire it up.
Creetown: already put petrol in a diesel?
Then the order of things is brief. Starting it is out, and so is switching on your ignition. The staff at the forecourt — whether at the nearest petrol station itself or wherever you filled up — will normally help push it clear of the petrol pump if you ask. Then phone 0333 366 0103 and tell us what got in, about how much, and if it has run.
Say so if it was AdBlue instead of petrol: it is a separate issue, with its own page for Creetown, since AdBlue brings corrosion and deposits rather than lost protection.
Why one petrol in a diesel job around Creetown costs more than another
There's no fair single price for this, since the four scenarios above are four separate jobs. What shifts the cost is mostly which of them you are in. Where the car is matters too, and whether our van can safely reach it, after the ratio of petrol to what that tank takes.
Three queries come first, before any quote, rather than after — what was put in, how much, has it run — and that is the reason. A range becomes a straight figure when those replies are in.
About Creetown and its setting
Creetown is a small coastal village in Dumfries and Galloway, situated near the mouth of the River Cree at an elevation of 11 metres. Creetown has a mix of housing types, with terraced houses being predominant, and is located near other small settlements such as Carsluith and Palnure. Creetown is close to the Solway Coast and is part of the wider Dumfries and Galloway landscape, with the nearest city being Carlisle, approximately 57 miles away.
Fuel drain cover around Creetown and across Dumfries and Galloway
Petrol in diesel calls in Creetown — part of the DG postcode area — go to vans that likewise cover the places about it, Carsluith, Palnure and Duncan Park included. You need not move the car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots we drain.
At the pump in Creetown, right now?
The best spot there is, then — that's where you are. Turned off it remains; then call.