How Worried Should You Be? Petrol in a Diesel Car in Crook Log
Likely less than you are now — provided nobody has started the car. Petrol sitting in a diesel tank does nothing to your motor till something pulls it through the system — the ignition priming the pump, your starter, or driving on its own. So the truthful answer to the first question everyone in Crook Log asks, "have I ruined it?", is generally no. Leave your motor off and ring Petrol in Diesel — that is how you keep it like that. Further down, you will find what petrol really does inside a diesel, how far it may have got, and how to stop it happening to you a second time.
The engine and petrol in a diesel: what happens
Diesel does two tasks on its way through an engine. Before it burns, it lubricates — then it burns. Made to extremely fine clearances, the injectors and the pump rely on the diesel flowing through them to keep their surfaces from wearing against one another.
Of these two tasks, petrol handles the first badly and the second never. A pump working on a petrol mixture is wearing itself out, because petrol is thinner than diesel and strips out 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 is where any clattering comes.
Put these together and the shape of the issue is clear. It's circulation that causes the harm, not contact. Petrol in the tank is a fuel issue. Whatever a worn pump sheds goes on, borne by your fuel, into the fuel injectors downstream, which is why a pump that has worked on the petrol is where a mechanical fault starts.
Four situations our engineers see around Crook Log: how bad is petrol in a diesel?
Filled up, and not started: nothing beats it. Being at a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With that petrol kept inside that tank alone, it is emptied and cleaned right where it stands, and nothing more is needed.
Ignition on, or started for a moment. Petrol has come out of the tank and reached the filter and your lines, since the fuel system has been primed. That's generally still a straightforward task — a drain, a flush, and your filter dealt with.
Your pump has worked a couple of miles on diluted fuel — that's what driving it does. The work is the tank, your lines, the fuel filter and fresh fuel through the whole circuit, and how hard the vehicle was driven matters as much as how far. Short trips, like the school run to Crook Log Primary School, are one thing. Driving as far as London, under 15 miles away, makes a very different job — as does any miles on the M25, under 10 miles from Crook Log, with your engine labouring hard the whole time.
It protested, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone lumpy. That is your motor telling you its fuel has stopped behaving like diesel. Pull up where you are — on the verge on Gainsborough Square, at the kerb, down a side road — and don't move it. The fuel drain and flush still come first, and they take care of it: when a vehicle is pulled over early, lasting damage is very unusual.
Petrol in a diesel stories Crook Log people hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." A bigger tank of the same mixture is all it gives, since topping up takes out nothing. A diesel fuel system doesn't accept petrol by percentage in the way that advice supposes.
"Newer diesels can handle a little petrol" — a myth, and nearer the reverse. Protection counts more on current diesels, not less, since their fuel runs through more precise parts at higher pressure.
"It starts, it drives, and so no harm done" — the myth that trips up more motorists than any other. Any petrol motor fed diesel usually will not run, and so the motorist stops and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile your pump grinds. Being able to run isn't proof of being fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an old workaround for a separate problem. What petrol has diluted stays diluted, and that petrol stays in your tank anyway.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol lies in your filter and lines, ready to go right back through your pump on your next start. Also, a can of petrol drained at the roadside is genuinely hazardous.
How it happens: petrol in a diesel
On purpose? Never. Through carelessness? Seldom, if ever. The petrol nozzle is the narrower of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol vehicle at all. The forecourt makes it easy, and the mistake runs one way.
The moment routine stops matching your car is the moment it takes place. A new motor, a hire car or a courtesy car. Households running one of each, petrol and diesel. The pumps in a different order on a well-known forecourt. A rushed fill on the way to Bexleyheath with a train to catch. The first fill-up in a diesel Skoda Octavia after years of driving petrol is exactly the moment it takes place. Add a back seat full of kids, a phone call or rain, and the hand takes over.
Next time you fill up around Crook Log: avoiding petrol in a diesel
- Check the pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on every forecourt. The label is what matters.
- The first fill in an unfamiliar vehicle is the time to check your filler flap — on it, or on the cap, many motors state the fuel to use.
- Label your key. In a home with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- It sounds daft and it works: on your first fill in a new or hired car, say "diesel" aloud 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 and keep your mind on the petrol pump.
- Some diesels have a filler built to reject a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the petrol pump.
- The moment you notice, stop: less petrol in the tank makes a weaker mixture. What to do next doesn't change, though — still don't fire it up.
Petrol already in a diesel in Crook Log? Start here
In that case, there's just a short order of things. Leave it unstarted, with your ignition off too. If you're still at the forecourt — Esso or anywhere else — ask the staff to help you roll the car clear of the petrol pump. Then call 0333 366 0103 and tell us what was put in, about how much, and whether it has run.
Corrosion and deposits are the problem with AdBlue, where petrol brings lost lubrication. So if it was AdBlue, say so — and read its own Crook Log page.
Crook Log petrol in a diesel tasks: why one costs more than another
A fair single quote doesn't exist here: four scenarios, four separate tasks. What shifts your cost is chiefly which of them you're in. The ratio matters next, meaning how much of your tank is petrol, and then the position of the vehicle and whether reaching it is safe for a technician.
Before any quote, not after, come three questions: the fuel that went in, its quantity, and if it's run. That's why. Those replies are what turn a range into one firm number.
About Crook Log
Crook Log is a suburban area in south-east London, situated approximately 11.5 miles from central London and near the towns of Bexleyheath and Welling. Crook Log has a population of around 8437 people and is characterised by semi-detached housing. Crook Log sits at an elevation of around 50 metres, in a gently sloping landscape typical of the London suburbs.
Fuel drain cover in Crook Log and across Greater London
Bexleyheath, Blendon and Welling are among the places near Crook Log that the same teams work, answering petrol in diesel calls across Crook Log's DA postcode area. A forecourt, a supermarket car park, a lay-by or your own drive are all locations our engineers drain, and your vehicle does not need to move to us.
Still at the petrol pump in Crook Log?
The best spot there is, then — that's where you are. Turned off it stays; then ring.