Petrol in a Diesel Car in Bromley Common: How Worried Should You Be?
Probably less than you are now — provided nobody has started the vehicle. Until the ignition primes your pump, the starter cranks, or the vehicle is driven, petrol in a diesel tank just sits there and does no harm. Which makes the truthful reply to the first Bromley Common query — "have I wrecked it?" — usually no. Keep it that way: leave the engine off and ring Petrol in Diesel. What petrol actually does to a diesel, how to gauge how far it has travelled, and how to keep it from happening again: that is the rest of this page.
Petrol in a diesel: what does it do to the motor?
Two jobs fall to diesel on its journey round a motor. It lubricates first, and only then does it burn. Very fine clearances are built into the injectors and the high-pressure fuel pump, and only the diesel running through keeps their surfaces from grinding together.
The second task petrol does not do at all, and the first it does badly. A pump running on a petrol blend is wearing itself out, since petrol is runnier than diesel and takes away the protection the fuel system relies on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that is where the clattering starts.
The shape of the problem is plain when you put those together. It is movement that causes the harm, not contact. Where that petrol is only in the tank, it's a problem 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 fuel injectors downstream.
How serious is petrol in a diesel? Four situations we see in Bromley Common
Fuelled but never started — as good as it gets. Being at a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With the petrol kept inside the tank alone, it is drained and rinsed on the spot, and nothing more is needed.
Ignition on, or started for a second. With the fuel system primed, the lines and filter now hold petrol that has come from that tank. Still generally straightforward: drain, flush, and the filter sorted.
Your pump now worked a couple of miles on diluted fuel — that is what driving the car does. Tank, lines, filter, then fresh fuel put through the entire system: that is the work, and the way the vehicle was driven counts as much as the mileage. Driving the children to Trinity Church of England Primary School is one sort of trip. Very different once more: a trip to London, under 15 miles away, or some miles on the M25, under 5 miles from Bromley Common, where the motor kept working hard.
Knocking, a ragged idle, smoke, a throttle gone soft: driven until it complained. The fuel isn't acting like diesel any more, and your engine is saying so. Pull up where you are — on the verge on Brosse Way, at the kerb, down a side road — and don't move it again. The drain and flush-through still go first, and they sort it out: if a car is stopped early, lasting damage is very uncommon.
Myths Bromley Common people hear about petrol in a diesel
"Top it up the rest of the way with diesel and it will be fine" — a myth. It will not. A bigger tank of the same mix is all you get, because topping up takes out nothing. Percentage isn't how a diesel fuel system tolerates petrol, however much that guidance supposes.
If anything, the reverse is true. Myth: "A modern diesel can cope with a bit of petrol." A current diesel sends its fuel through more precise parts at higher pressure, which makes the lubrication matter more, not less.
"It starts, it drives, and so no harm done" — the myth that trips up more drivers than any other. Diesel in a petrol motor normally leaves a motor that will not run: the motorist stops, and so does the damage. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump grinds. Being able to run is not proof of being fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate problem. The petrol is still in the tank afterwards, and what it has thinned is not put back.
Myth: "Drain your tank yourself and you're sorted." Once the motor has run, some of the petrol is no longer inside your tank: it's in your filter and your lines, and it goes right back through your pump on the next start. Draining petrol into a can at the roadside is also really dangerous.
Why petrol in a diesel takes place at all
On purpose? Never. Through carelessness? Seldom, if ever. The forecourt makes it simple: the petrol nozzle is the slimmer of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle generally won't go into a petrol car at all. So the mistake runs one way.
Routine and your car getting out of step is how it occurs. A new car, a hire car or a courtesy car. Households running one of each, petrol and diesel. A well-known forecourt with the pumps in a different order. A hurried fill on the way to Bickley with a train to catch. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it happens. Throw in a back seat full of kids, a phone call or rain, and the hand wins.
Bromley Common motorists: how to avoid petrol in a diesel next time
- The label is what matters, so read the petrol pump rather than the colour: in the UK unleaded handles are normally green and diesel black, but not on every forecourt.
- The first fill in a strange motor is the time to check the filler flap — inside it, or on the cap, plenty of motors state the fuel they take.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of intending to remember, for a house with one of each.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump. It seems silly and it does the trick.
- Mistakes like this are simple to make whilst your mind is on something else, and so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to block a petrol nozzle, and aftermarket devices exist for the rest. Treat it as a backstop, and keep reading the petrol pump.
- Less petrol means a weaker mixture, so stop the moment you notice — though remembering that your next stage is unchanged. It's still not to crank it.
Put petrol in a diesel around Bromley Common already?
Short and simple, then, is the order of things. Don't crank it, and do not turn the ignition on. Ask the attendants to help you push it clear of the petrol pump if you are still at the forecourt, whether that's BP or somewhere else. Ring 0333 366 0103 next, with three facts — your fuel, the approximate volume, and whether it has run.
Say so if it was AdBlue instead of petrol: it is a separate fault, with its own page for Bromley Common, because AdBlue brings corrosion and deposits instead of lost protection.
One petrol in a diesel task around Bromley Common costs more than another. Why?
There is no honest single price for this, since the four scenarios above are four separate jobs. Chiefly, the cost moves with which one you're in. The share matters next, meaning how much of your tank is petrol, and then the position of the vehicle and whether getting to it is safe for a van.
Ahead of any quote, not after, come three questions: the fuel that was put in, the quantity, and whether it's run. That's why. Given those answers, you get a straight figure rather than a range.
About Bromley Common and its setting
Bromley Common is a suburban area in Greater London, situated near several lakes and ponds, with an elevation of around 73 metres. Bromley Common lies approximately 11 miles southeast of central London, within commuting distance of the city. Bromley Common is characterized by a high proportion of flat dwellings, reflecting its suburban nature. Bromley Common is close to neighbouring areas such as Southborough and Hayes.
Fuel drain cover in Bromley Common and across Greater London
Southborough, Hayes and Keston Mark are among the spots near Bromley Common that the same teams work, answering petrol in diesel call-outs across Bromley Common's BR postcode area. We drain where the vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the pump in Bromley Common?
The best spot there is, then — that's where you are. Switched off it stays; then call.