How Worried Should You Be? Petrol in a Diesel Car in Great Bridge
Not started? Then less anxious than you probably are. Everyone around Great Bridge begins with "have I wrecked it?", and the fair answer is usually no: petrol left inside that tank of any diesel remains harmless till priming, cranking or driving pulls it into your fuel system. To leave it that way, call Petrol in Diesel and leave your motor alone. What petrol actually does to a diesel, how to judge how far it has travelled, and how to stop it from happening again: that's the rest of this page.
What petrol in a diesel does to the engine
Diesel has two tasks on its way through a motor. It combusts, and before it ignites it protects. What stops the surfaces inside the high-pressure fuel pump and your injectors from grinding against one another is your diesel flowing through them — they are designed to extremely fine tolerances.
Of those two tasks, petrol manages the first poorly and the second not at all. It's runnier than diesel and takes away the lubrication your fuel system rests on, so a pump running on a petrol mix is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That's where the rattling comes from.
Together, those leave the shape of the trouble plain. The damage is done by circulation, not by contact. A tank with petrol in it is a fuel fault. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with the fuel to the fuel injectors further on.
Great Bridge, petrol in a diesel: four situations, from mild to major
Fuelled up, not once started. The best case there is. The petrol is inside the tank and just the tank, and the job is a drain and a flush where the car sits. This is the one scenario that can only really take place on a forecourt, since anywhere else the car has been driven to get there.
Ignition on, or started for a moment. Petrol has left that tank and reached the filter and the lines, since your system has been primed. Usually little more than draining, cleaning and sorting the fuel filter, and so still easy.
Your pump now worked a few miles on weakened fuel — that is what driving the vehicle does. Tank, lines, filter, then fresh fuel put through the whole circuit: that is the work, and the way the car was driven matters as much as the distance. A school run to Great Bridge Primary School is one matter. A run as far as Wolverhampton, under 10 miles away, is a very different job. So is any miles on the M5, under 3 miles from Great Bridge, where the motor has been working hard throughout.
Driven till it complained. Clattering, a lumpy idle, smoke, a throttle that has gone soft. The fuel is not behaving like diesel any more, and your motor is saying so. Whether it's the verge on Meeting Street, a lay-by or a side street, stop there and leave it. The drain and flush-through still go first, and they deal with it: when a car is stopped quickly, permanent damage is very uncommon.
What Great Bridge motorists get told about petrol in a diesel — and the myths in it
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. A bigger tank of the same mixture is all it gives, since topping up takes out nothing. Percentage isn't how a diesel fuel system copes with petrol, however much that guidance supposes.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." At higher pressure, through more precise components: that is how a current diesel handles its fuel, and so the protection matters more, not less.
The myth that catches people out: if it starts and drives, it must be unharmed. Any petrol engine fed diesel usually won't run, and so the motorist stops and the harm stops with them. While the pump wears, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Being able to run isn't the same as being fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a separate problem. What petrol has thinned stays thinned, and the petrol stays in the tank regardless.
Myth: "Drain that tank yourself and you are sorted." Once your engine has run, some of that petrol is no longer in the tank: it's in the filter and your lines, and it goes right back through the pump at the next start. Draining petrol into a can at the kerbside is also genuinely hazardous.
How does petrol in a diesel occur?
Carelessness is rarely the cause, and no one means to do it. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol car at all. The forecourt makes it easy, and the mistake runs one way.
The moment habit stops matching your car is the moment it occurs. Hire cars, courtesy cars, and cars that are new to you. Two vehicles on one drive, one petrol, one diesel. Your normal forecourt, its pumps now in a different order. Fuelling up in a hurry on the way to Dudley Port, with a train to catch. Years of petrol vehicles behind you, a diesel Volkswagen Tiguan in front of you at the forecourt for its first tank — that is when. Throw in a back seat full of kids, a phone call or rain, and habit wins.
How to avoid petrol in a diesel on your next fill-up in Great Bridge
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Read the pump's label; the colour is only a hint.
- The first fill in a new motor is the time to check the filler flap — inside it, or on the cap, many motors state which fuel they take.
- Label the key. In a home with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember.
- Before the nozzle comes off the pump the first time you fill a hired or new vehicle, say "diesel" out loud. Daft, yes, yet it does the trick.
- Mistakes like this are easy to make while your mind is on something else, so the phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to refuse a petrol nozzle, and add-on devices are available for the remainder. Treat it as a safety net, and keep checking the petrol pump.
- Less petrol means a weaker mixture, so stop the moment you notice — though remembering that the next stage is unchanged. It's still not to start the vehicle.
Petrol already in a diesel around Great Bridge? Begin here
Then the order of things is brief. Do not turn the ignition on, and do not start it. Still at the forecourt, at Asda or anywhere else? Ask the attendants to help you roll the car away from the pump. Next, 0333 366 0103. We will ask what got in, about how much, and if it has been run.
Corrosion and deposits are the problem with AdBlue, whereas petrol means lost lubrication. So if it was AdBlue, say so — and read its own Great Bridge page.
One petrol in a diesel task in Great Bridge costs more than another. Why?
There is no honest single quote for this, since the four situations above are four different tasks. Chiefly, your cost moves with which situation you are in. The ratio counts next, meaning how much of that tank is petrol, followed by the position of the car and whether getting to it is safe for a technician.
That is why our technicians ask three questions before quoting instead of after: what went in, how much, and if it has run. The answers turn a range into a straight figure.
About Great Bridge, for a moment
Great Bridge is a locality situated on the lakeside in the West Midlands, with an elevation of 131 metres and a population of around 5394 residents. Great Bridge is located near several other places, including Toll End, Horseley Heath, and New Town, and is approximately 5.5 miles from Wolverhampton. Great Bridge has a mix of housing types, but semi-detached homes are the most predominant. Great Bridge is also relatively far from London, at a distance of 107.7 miles.
Great Bridge and West Midlands: where our fuel drain cover runs
Toll End, Horseley Heath and New Town are among the locations near Great Bridge that the same teams work, answering petrol in diesel jobs across Great Bridge's DY postcode area. The car doesn't need to come to us: we drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
In Great Bridge and still at the petrol pump?
The best position there is, then — that's where you are. Turned off it stays; then call.