Billingborough: Petrol in a Diesel Car? How Worried to Be
Not started? Then less worried than you probably are. Petrol resting in a diesel tank does nothing to the motor till something pulls it through the system — your ignition priming your pump, the starter, or the drive on its own. So the honest answer to the first query anyone around Billingborough asks, "have I ruined it?", is normally no. Keep it that way: leave the engine off then call Petrol in Diesel. The remainder of this page covers 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.
The motor and petrol in a diesel: what happens
On its way through a motor, diesel does two jobs. Before it burns, it lubricates — then it combusts. What keeps the surfaces inside your high-pressure pump and the fuel injectors from wearing down against one another is the diesel passing through them — they're built to extremely fine tolerances.
Petrol does the first job poorly and the second not at all. The clattering comes from petrol being made 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 away the protection your system depends on, and any pump working on that blend is wearing itself.
Seen together, they show the shape the issue takes. The harm is done by circulation, not by contact. Any tank with petrol in it is a fuel fault. Whatever a worn pump sheds travels on, borne by the fuel, into the injectors further along, which is why a pump that has worked on that petrol is where a mechanical issue starts.
Petrol in a diesel in Billingborough: how serious is it? Four situations
The best case there is: filled up, never started. The petrol is inside your tank and only your tank, and the job is a drain and a flush where your car stands. This is the one scenario that can only truly happen at a forecourt, since anywhere else your car has been driven to get there.
Ignition on, or started for a second. Once primed, the fuel system has drawn petrol out of your tank as far as your filter and your lines. Drain, flush, see to the filter: still normally simple.
Driven a few miles. Now your pump has spent those miles labouring on diluted fuel. The work is your tank, the fuel lines, the fuel filter and fresh fuel through the whole circuit, and how hard the car was driven counts as much as how far. Short trips, such as the school run to Billingborough Primary School, are one thing. A run as far as Peterborough, under 25 miles away, is a very different task. So is any mileage on the Great North Road, under 25 miles from Billingborough, where the motor has been running hard the whole time.
Driven till it complained. Knocking, a ragged idle, smoke, a throttle that has gone soft. That's your motor telling you its fuel has stopped behaving like diesel. Whether it's the verge on Chapel Street, a lay-by or a side street, stop there then leave it. Permanent damage is very uncommon when a car is stopped quickly, and the fuel drain and flush that still go first deal with it.
Myths Billingborough people hear about petrol in a diesel
Myth: topping up to full with diesel makes it fine. It does not. A fuller tank of the same mix is all it gives, because topping up takes out nothing. Percentage is not how a diesel fuel system copes with petrol, whatever that guidance assumes.
"Current diesels can handle a little petrol" — a myth, and nearer the opposite. At higher pressure, through more precise components: that's how a current diesel handles its fuel, and so the protection counts for more, not less.
The myth that catches drivers off guard: if it starts and drives, it must be unharmed. Diesel in a petrol motor usually leaves a motor that won't run: the motorist stops, and so does the harm. Whilst the pump wears, a diesel fed petrol usually starts, idles and drives away as if nothing has happened. Being able to run is not the same as being fine.
Myth: a two-stroke additive lets you to drive home. It is an old fix, meant for another issue. It doesn't put back what petrol has weakened, and the petrol is still inside that tank later.
Once the engine has run, part of that petrol sits in the fuel filter and your lines, not that tank — and the next start sends it straight back through the pump. So the myth "drain the tank yourself and you're sorted" does not stand up. Draining petrol into a can by the roadside is also genuinely risky.
How does petrol in a diesel occur?
It's rarely carelessness, and no one does it on purpose. The petrol nozzle is the smaller of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol motor at all. The forecourt makes it easy, and the error runs one way.
It happens when habit and your car stop matching. Courtesy car, hire car, or a car that's new. A household with one petrol and one diesel on the drive. The pumps in a different order on a well-known forecourt. Rushing for a train outside Heckington and filling up en route. The first fill-up in a diesel Renault Megane after years of driving petrol is exactly the moment it occurs. With rain, a call coming in, or a car full of children to deal with, your hand just does what it always has.
Billingborough people: how to prevent petrol in a diesel next time
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most generally do. Read the petrol pump's label; the colour is only a hint.
- The first fill in a strange motor is the time to check the filler flap — on it, or on the cap, many motors state the fuel to use.
- Mark 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 intending to remember.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump. It seems daft and it works.
- Mistakes like this are easy to make whilst your mind is on something else, and so your phone goes away.
- Some diesels come with a filler built to block a petrol nozzle, and devices you can add exist for cars without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump.
- Less petrol means a thinner mix, and so stop as soon as you notice — though remembering that your next step is unchanged. It's still not to fire it up.
Already put petrol in a diesel in Billingborough?
The order of things is brief, then. Leave it unstarted, with your ignition switched off too. The staff at the forecourt — whether at the nearest petrol station itself or wherever you filled up — will normally help roll it clear of the petrol pump if you ask. Next, 0333 366 0103. We will ask what went in, about 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 Billingborough, since AdBlue brings corrosion and deposits rather than lost lubrication.
What makes one Billingborough petrol in a diesel task cost more than the next
Four different tasks sit behind the four scenarios above — which is why there is no honest single price. The scenario itself does most of the work of moving your cost. The ratio matters next, meaning how much of the tank is petrol, followed by the location of the car and whether reaching it is safe for our van.
Ahead of any quote, not after, we ask three questions: the fuel that went in, the volume, and if it has run. That's why. With those replies, you get a straight figure instead of a range.
About Billingborough and its setting
Billingborough is a village in southern Lincolnshire, situated on the banks of the River Witham at an elevation of around 13 metres. Billingborough sits in a rural area, with nearby villages including Horbling, Sempringham, and Birthorpe, and is approximately 22.5 miles from Peterborough. Billingborough has a population of around 1130 people, predominantly living in detached houses. Billingborough is located about 96.2 miles north of London, in the East Midlands region.
Fuel drain cover across Lincolnshire, Billingborough included
Horbling, Sempringham and Birthorpe are among the places around Billingborough that the same teams work, answering petrol in diesel calls across Billingborough's NG postcode area. A forecourt, a supermarket car park, a lay-by or your own drive are all locations our technicians work, and your vehicle does not need to come to us.
Billingborough: still at the petrol pump?
No position is better: that is where you are. Ring, and keep it switched off.