Petrol in a Diesel Car in New Village: How Worried Should You Be?
Not started? Then less anxious than you likely feel. Everyone around New Village starts with "have I ruined it?", and the fair answer is generally no: petrol left in your tank of any diesel stays harmless until priming, cranking or driving draws it into the fuel system. Keep it that way: leave your motor off then call Petrol in Diesel. The rest of this page sets out what petrol really does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you again.
What petrol in a diesel does to the engine
Passing through an engine, diesel is doing two jobs at once. It combusts, and before it ignites it lubricates. Very fine gaps are built into your injectors and your high-pressure pump, and only your diesel running through stops those surfaces grinding together.
Petrol handles the first task badly and the second not at all. The clattering comes from petrol being designed not to ignite when compressed, which is precisely the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips out the lubrication the fuel system depends on, and any pump running on that mixture is wearing itself.
The shape of the problem is clear once you put those together. Not contact but circulation is what causes the harm. All a tank with petrol in it amounts to is a fuel fault. The beginning of a mechanical one is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with your fuel to the injectors beyond it.
How bad is petrol in a diesel? Four scenarios our engineers see in New Village
Filled up, and not started: nothing beats it. Just the tank has petrol in it, and so the task is draining that tank and cleaning your system where the car stands. This scenario can only really occur on a forecourt: anywhere else, the car got there by being driven.
A brief spell of running, or merely the ignition on. Once primed, the system has pulled petrol out of the tank as far as the fuel filter and the fuel lines. Drain, flush, deal with your filter: still usually easy.
The pump now spent a couple of miles on diluted fuel — that's what driving it meant. Miles is only half of it; how hard it was driven matters just as much. Either way this work includes your tank, your lines, your filter and fresh fuel through the whole system. A school run to Bentley New Village Primary School is one thing. Very different once more: a run to Doncaster, under 3 miles away, or any miles on the A1(M), under 3 miles from New Village, where the motor kept running hard.
Knocking, a ragged idle, smoke, a throttle gone soft: driven till it complained. The fuel is not behaving like diesel any more, and your engine is saying so. Leave it where it has stopped: a lay-by, a quiet street, the verge on Asquith Road. A car stopped early very rarely has long-term damage, because the fuel drain and the flush-through, which still go first, sort it out.
Petrol in a diesel stories New Village people hear
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. A bigger tank of the same mix is all you get, because topping up takes out nothing. The idea behind that guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
"Current diesels can handle a little petrol" — a myth, and nearer the reverse. At higher pressure, through finer components: that is how a modern diesel handles its fuel, and so the lubrication matters more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that fools drivers. A petrol motor fed diesel usually will not run, so the driver stops and the harm stops with them. Feed petrol to a diesel and it usually fires up, ticks over and pulls away like nothing happened — all while its pump is wearing. Being able to run isn't the same as being fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an old workaround for a different problem. What petrol has weakened remains weakened, and the petrol remains inside that tank anyway.
Once the motor has run, part of that petrol is in the filter and the 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" does not hold. It is also genuinely hazardous to drain petrol into a can at the roadside.
Why petrol in a diesel takes place at all
On purpose? Never. Through carelessness? Seldom, if ever. The forecourt makes it easy: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle mostly won't go into a petrol motor at all. So the slip runs one way.
The moment routine stops matching your car is the moment it occurs. A new car, a hire car or a courtesy car. One petrol and one diesel on the drive of the same household. A forecourt you know, only with its pumps arranged differently. Filling up in a hurry on the way to Bentley (South Yorkshire), with a train to catch. The first fill-up in a diesel Volkswagen Tiguan after years of driving petrol is exactly the moment it takes place. Add a back seat full of children, a phone call or rain, and the hand wins.
Next time you fill up around New Village: avoiding petrol in a diesel
- Check the petrol 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.
- Many motors state the fuel inside your filler flap or on the cap, so check there on your first fill in any vehicle you do not know.
- Good intentions do less than a sticker or a fob in a vivid colour on the diesel's key if a household has one of each. So label it.
- Before the nozzle leaves the pump the first time you fill a hired or new car, say "diesel" out loud. Daft, perhaps, yet it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, so tuck the phone away then keep your mind on the pump.
- Add-on devices are available for vehicles without one, and some diesels are built with a filler that will not accept a petrol nozzle. Helpful — but a backstop only, never a reason to stop checking the label.
- Less petrol means a weaker mix, so stop the moment you notice — though remembering that your next stage is unchanged. It's still not to crank it.
New Village: already put petrol in a diesel?
Then the order of things is short. Starting it is out, and so is switching on the ignition. Yet at the forecourt, at Shell or anywhere else? Ask the attendants to help you push the vehicle away from the pump. Then call 0333 366 0103 and tell us what went in, about how much, and if it's run.
If it was AdBlue rather than petrol, say so. That is a different issue — corrosion and deposits instead of lost protection — and it has its own page for New Village.
New Village petrol in a diesel jobs: why one costs more than another
Four separate tasks lie behind the four situations above — which is why there is no fair single quote. What moves the cost is chiefly which of them you're in. Where the vehicle is matters too, and whether a technician can safely get to it, after the proportion of petrol to what the tank takes.
That's why we ask three queries before quoting instead of after: what got in, how much, and whether it's run. A range becomes a straight figure when those answers are in.
About New Village
New Village is a suburban area located on the riverside in South Yorkshire, with a low elevation of around 6 metres. New Village sits near the city of Doncaster, approximately 2.1 miles away, and is close to other nearby places such as Stockbridge and Bentley. New Village has a population of around 4670 people and predominantly consists of terraced housing.
Fuel drain cover across South Yorkshire, New Village included
Stockbridge, Rostholme and Bentley are among the spots near New Village that the same vans work, answering petrol in diesel calls across New Village's DN postcode area. The vehicle does not need to come to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
New Village: still at the pump?
In that case, you could not be in a better position. Call, and keep it switched off.