Should You Worry? Petrol in a Diesel Car in Ripley
Less than you likely are, provided it has not been started. "Have I wrecked it?" is the first thing everyone in Ripley asks, and the truthful answer is usually no, because petrol resting in a diesel tank harms nothing till it is drawn through your fuel system — by ignition priming, by your starter, or by driving. Leave the motor off and phone Petrol in Diesel — that is how you keep it like that. The rest of this page sets out what petrol really does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you a second time.
Inside your engine: what petrol in a diesel really does
Two tasks fall to diesel on its journey round a motor. Before it combusts, it lubricates — and then it ignites. The high-pressure fuel pump and the fuel injectors are made to very fine clearances, and the diesel passing through them is what stops those surfaces from wearing down against each other.
Petrol handles the first job badly and the second not at all. It is thinner than diesel and takes away the lubrication the system rests on, and so a pump running on a petrol blend is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the rattling comes from.
Together, those leave the shape of the problem plain. It's circulation that does the damage, not contact. All a tank with petrol in it amounts to is a fuel fault. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with the fuel to the fuel injectors further on.
How bad is petrol in a diesel? Four scenarios we see in Ripley
Filled but not once started — the best it gets. Being at a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With the petrol kept inside that tank alone, it is cleared and rinsed right where it stands, and nothing more is needed.
Started for a second, or just the ignition on. Petrol has come out of your tank and reached the filter and the lines, since the system has been bled. That's usually still a simple job — a drain, a flush, and your filter dealt with.
A few miles driven, and the pump has spent every one of them labouring on weakened fuel. The work is the tank, the fuel lines, the fuel filter and clean fuel through the entire circuit, and how hard your car was driven matters as much as how far. Short trips, like the school run to Lons Infant School, are one matter. Any distance on the M1, under 5 miles from Ripley, means your engine has worked hard throughout, and a run to Derby, under 10 miles away, is a very different job as well.
Rattling, a ragged idle, smoke, a throttle gone soft: driven till it complained. That's the engine telling you its fuel has stopped behaving like diesel. Leave it wherever it stops: a lay-by, a quiet street, the verge on Derby Road. The fuel drain and flush still go first, and they deal with it: if a car is stopped soon, permanent damage is very rare.
Myths Ripley people hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Nothing is removed by topping up — you're left with a fuller tank, still the same mixture. The idea behind the guidance — that diesel fuel systems accept petrol by percentage — is wrong.
"Current diesels can handle a little petrol" — a myth, and nearer the opposite. A current diesel sends its fuel through smaller parts at higher pressure, which makes the protection count more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that fools drivers. A petrol motor fed diesel generally will not run, so the driver stops and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile the pump wears. Fine and running are not the same at all.
Myth: a two-stroke additive lets you to drive home. It is an old workaround, supposed for another issue. What petrol has diluted stays diluted, and the petrol stays in that tank regardless.
"Drain it yourself and you are sorted" — a myth, because after it has been running some petrol sits in the fuel filter and lines, waiting to go straight back through the pump on your next start. It is also really risky to drain petrol into a can by the roadside.
Petrol in a diesel: how does it take place?
No one does it on purpose, and it's seldom carelessness. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol motor at all. The forecourt makes it easy, and the slip runs one way.
Habit and the vehicle falling out of step is when it occurs. A vehicle that is new to you — a hire car, on loan as a courtesy car, or brand new. Two motors on one drive, one petrol, one diesel. A forecourt you know, but with its pumps arranged differently. Filling up in a hurry on the way to Ambergate, with a train to catch. Precisely the moment it takes place: after years of driving petrol, a driver fills a diesel Renault Megane for the first time. Throw in rain, a phone call or a back seat full of children, and your hand does what it has always done.
Ripley motorists: how to avoid petrol in a diesel next time
- Read the pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on every forecourt. The label is what counts.
- In a motor you do not know, look inside the flap over the filler or at the cap before your first fill: plenty of vehicles print the fuel type there.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of meaning to remember, for a house with one of each.
- Before the nozzle comes off the petrol pump the first time you fuel a hired or new motor, say "diesel" aloud. Silly, yes, 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 petrol pump.
- Some diesels have a filler designed 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 backstop, not a reason to stop reading the petrol pump.
- Stop the moment you notice. Less petrol in your tank makes a weaker mix. It does not change what to do next, which is still not to fire it up.
Put petrol in a diesel in Ripley already?
Then, there's only a short order of things. Starting it is out, and so is turning on your ignition. Still at the forecourt, at The Co-operative or anywhere else? Ask the attendants to help you roll the car away from the petrol pump. Next, 0333 366 0103. We'll ask what was put in, roughly how much, and if it's been run.
Say so if it was AdBlue rather than petrol: it's a separate problem, with its own page for Ripley, because AdBlue brings corrosion and deposits instead of lost protection.
Ripley petrol in a diesel tasks: why one costs more than another
There is no fair single quote for this, since the four scenarios above are four separate jobs. What moves the cost is mostly which of them you are in. The share matters next, meaning how much of your tank is petrol, and then the position of the car and whether getting to it is safe for a van.
That is why our technicians ask three questions before quoting rather than after: what was put in, how much, and if it's run. Those answers are what change a range into one firm number.
About Ripley
Ripley is a town in Derbyshire, situated in the East Midlands region of England, with a population of around 14413 people. Ripley sits inland, approximately 162 metres above sea level, and is located about 9.1 miles from Derby. Ripley has a mix of housing types, but semi-detached homes are particularly prevalent in the area. Ripley is also close to several nearby places, including Nuttals Park, The Elms, and Porterhouse.
Across Derbyshire and in Ripley: fuel drain cover
Our teams answering petrol in diesel call-outs around Ripley, in the DE postcode area, equally work the places near it, Nuttals Park, The Elms and Porterhouse among them. You need not bring the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places we drain.
Still at the pump in Ripley?
Then you are in the best position there is. Keep it off. Call.