Should You Worry? Petrol in a Diesel Car in Pilsley
Provided it hasn't been started, worry far less than you likely are. "Have I ruined it?" is the first thing anyone in Pilsley asks, and the honest answer is normally no, since petrol resting in a diesel tank harms nothing till it is drawn through the system — by ignition priming, by your starter, or by driving. Leave the motor off then ring Petrol in Diesel — that is how you keep it like that. What petrol actually does to a diesel, how to judge how far it's travelled, and how to stop it from happening again: that is the rest of this page.
Inside the engine: what petrol in a diesel really does
On its way through a motor, diesel has two tasks. Lubricating comes before burning; it does both. Your high-pressure pump and the fuel injectors are made to extremely fine gaps, and the diesel passing through them is what keeps those surfaces from wearing against each other.
The second task petrol doesn't do at all, and the first it does poorly. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, leaving a pump running on that mixture wearing itself. It's also made to resist igniting under compression — the reverse of what a diesel needs — which is where you hear the clattering.
Combined, those make the shape of the problem plain. Contact doesn't do the damage — circulation does. Petrol in the tank is a fuel fault. After the pump has been working on that petrol, a mechanical fault has started: whatever is shed by a pump that's grinding is carried onward to your injectors with your fuel.
Pilsley, petrol in a diesel: four cases, from mild to serious
Fuelled but not once started — as good as it gets. On a forecourt, and really only there, the petrol is still confined to your tank — because everywhere else your car was driven to get to it. The job is emptying and flushing on the spot.
Started for a second, or just the ignition on. The system has been bled, and so petrol has left the tank and reached the filter and your lines. Usually little more than emptying, rinsing and sorting your filter, so still straightforward.
The pump has worked a few miles on thinned fuel — that's what driving the vehicle meant. How hard your car was driven matters as much as how far, and this work takes in the tank, the fuel lines, the fuel filter and clean fuel through the whole system. On the school run to Pilsley Primary School, the distance is short. Getting as far as Sheffield, under 25 miles away, makes a very different task — as does any miles on the M1, under 3 miles from Pilsley, with the motor running hard the whole time.
Knocking, a ragged idle, smoke, a throttle gone soft: driven until it complained. What you are hearing is your engine signalling fuel that no longer runs like diesel. Whether it's the verge on Morton Road, a lay-by or a side street, stop where you are and leave it. What comes first is still the fuel drain and flush-through, and that sorts it out, with long-term damage very rare when a vehicle is stopped quickly.
What Pilsley people get told about petrol in a diesel — and the myths in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Topping up removes nothing; it gives you a fuller tank of the same mix. The idea behind the advice — that diesel fuel systems accept petrol by percentage — is wrong.
Not so: a modern diesel copes with a bit of petrol. If anything, the opposite. Lubrication counts more on modern diesels, not less, because their fuel passes through more precise components at higher pressure.
"It starts, it drives, and so no harm done" — the myth that catches most motorists than any other. Feed diesel to a petrol motor and it usually will not run, and so the motorist stops — and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile your pump wears. Fine and running are not the same at all.
An outdated fix for a distinct problem is behind this one. Myth: "Add some two-stroke oil and drive the car home." That petrol is still in the tank afterwards, and whatever it has thinned is not put back.
The next start draws petrol back round the pump from the lines and the fuel filter, where some of it ends up after your engine has been run. That's why draining the tank yourself doesn't sort it — a myth. And, a can of petrol filled at the kerbside is truly risky.
Why petrol in a diesel takes place so easily
It is seldom carelessness, and nobody does it on purpose. The forecourt makes it easy: the petrol nozzle is the slimmer of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle mostly will not go into a petrol motor at all. So the mistake runs one way.
Routine and the car falling out of step is when it happens. A new vehicle, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. A familiar forecourt with the pumps in a different order. A rushed fill on the way to Alfreton with a train to catch. A new-to-you diesel Renault Megane, its first fuelling, and a motorist used to petrol: precisely when it happens. With rain, a call arriving, or a car full of children to deal with, your hand just does what it always has.
Next time you fill up in Pilsley: preventing petrol in a diesel
- Check the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on each forecourt. The label is what counts.
- Plenty of cars state the fuel type inside the filler flap or on the cap, and so check there on the first fill in a motor you don't know.
- One of each in the house? Mark your key to the diesel — a bright fob, a sticker — since intending to remember isn't enough.
- 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 sounds daft and it does the trick.
- Tuck your phone away. This is an easy mistake to make whilst you're thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to refuse a petrol nozzle, and add-on devices are available for the rest. Count it as a backstop, then keep checking the petrol pump.
- Spotting it halfway? Stop there and then. A weaker mix follows from less petrol in your tank, but the next step stays the same: do not start the car.
Already put petrol in a diesel around Pilsley?
Short and simple, then, is the order of things. Leave it unstarted, with your ignition off as well. Ask the attendants to help you roll it away from the petrol pump if you are still at the forecourt, whether that is Gulf or somewhere else. Call 0333 366 0103 next, with three facts — the fuel, the approximate amount, and if it's run.
Corrosion and deposits are the issue with AdBlue, whereas petrol means lost lubrication. So if it was AdBlue, say so — and read its own Pilsley page.
Why one petrol in a diesel task in Pilsley costs more than another
The four scenarios above are four different tasks, so no single quote for this would be honest. Which of them you are in is chiefly what shifts the cost. Beyond that it is the ratio — how much petrol went in against how much the tank takes — and after that where your car is and whether our van can get to it safely.
That is why we ask three queries before quoting rather than after: what was put in, how much, and if it's run. A range becomes a straight figure once the answers are in.
About Pilsley and its setting
Pilsley is a village in Derbyshire, situated on the riverside in the East Midlands region of England. Pilsley sits at an elevation of 157 metres, with Pilsley Green and Parkhouse Green nearby. Pilsley has a population of around 1784 people, predominantly living in semi-detached housing.
Fuel drain cover across Derbyshire, Pilsley included
Petrol in diesel call-outs in Pilsley — part of the S postcode area — go to vans that likewise cover the locations round it, Pilsley Green, Parkhouse Green and Hardstoft among them. The car does not need to come to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
In Pilsley and still at the pump?
The best position there is, then — that is where you are. Keep it off. Ring.