Should You Worry? Petrol in a Diesel Car in Feniscowles
If it hasn't been started, you can worry less than you probably are. "Have I ruined it?" is the first thing everyone in Feniscowles asks, and the truthful answer is generally no, since petrol left in a diesel tank hurts nothing till it's dragged through the system — by ignition priming, by the starter, or by driving. Petrol in Diesel is who to ring, with the motor left off, and so it remains that way. Below, you will find what petrol actually does inside a diesel, how far it might have got, and how to stop it happening to you again.
Inside the motor: what petrol in a diesel does
On its way through an engine, diesel has two jobs. It lubricates to begin with, and only then does it burn. Built to very fine tolerances, the injectors and the pump depend on your diesel moving through them to stop their surfaces wearing against one another.
Petrol handles the first job poorly and the second not at all. A pump running on a petrol blend is wearing itself out, since petrol is runnier than diesel and strips out the protection the fuel system relies on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that's where any knocking comes.
Combined, those leave the shape of the issue plain. Not contact but circulation is what causes the damage. All a tank with petrol in it amounts to is a fuel problem. Once your pump has been labouring on that petrol, a mechanical problem has begun: whatever is shed by a pump that is wearing is carried onward to the fuel injectors with the fuel.
How serious is petrol in a diesel? Four scenarios our engineers see in Feniscowles
Fuelled but never started — as good as it gets. Being on a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With that petrol held in your tank alone, it is cleared and flushed right where it stands, and nothing more is needed.
A brief spell of running, or merely the ignition on. Once primed, the fuel system has pulled petrol from the tank up to your filter and your lines. Still normally easy: drain, flush, and your filter seen to.
A few miles driven, and your pump has spent each of them working on thinned fuel. How hard your car was driven counts as much as how far, and this work takes in that tank, the lines, the fuel filter and clean fuel through the whole system. A school run to Feniscowles Primary School is one matter. A run as far as Preston, under 10 miles away, is a very different task. So is any miles on the M65, under a mile from Feniscowles, where your engine has been running hard the whole time.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. The fuel isn't behaving like diesel any more, and your engine is telling you. Stop where you are — on the verge on Larkspur Close, at the kerb, down a side road — and don't move it. What comes first is still the fuel drain and flush, and that takes care of it, with permanent damage very unusual when a vehicle is pulled over early.
Feniscowles motorists and that petrol in a diesel myths they hear
False: topping up to full with diesel makes it fine. It doesn't. Nothing comes out when you top up — your tank just carries more of the same mixture. Percentage isn't how a diesel fuel system tolerates petrol, however much that guidance presumes.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. Lubrication matters more on current diesels, not less, since their fuel runs through smaller parts at higher pressure.
"It starts, it drives, so there is no harm" — the myth that trips up most people than any other. Any petrol motor fed diesel normally will not run, so the motorist stops and the harm stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile your pump grinds. Being able to run is not proof of being fine.
Myth: "Add some two-stroke oil and drive the car home." It is an outdated workaround for a different fault. That petrol is still in your tank after that, and what it has thinned isn't put back.
"Drain it yourself and you are sorted" — a myth, because after it's been running some petrol lies in the filter and lines, waiting to go right back through your pump at your next start. Emptying petrol into a can at the kerbside is also truly dangerous.
Why petrol in a diesel happens so easily
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle generally won't fit a petrol motor, but the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error easy, and only in one direction.
The moment habit stops matching the car is the moment it takes place. Hire cars, courtesy cars, and cars that are new to you. One petrol and one diesel on the drive of the same household. A forecourt you know, but with its pumps arranged differently. A hurried fill on the way to Pleasington with a train to catch. A new-to-you diesel Volkswagen Tiguan, its first fuelling, and a driver used to petrol: precisely when it happens. Add rain, a phone call or a back seat full of children, and your hand repeats what it has always done.
Next time you fill up around Feniscowles: avoiding petrol in a diesel
- Read the pump, not the colour. In the UK unleaded handles are generally green and diesel black, but not on each forecourt. The label is what counts.
- The first fill in a new car is the time to check your filler flap — on it, or on the cap, plenty of motors state which fuel to use.
- A coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember, in a house with one of each.
- 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 pump. It sounds silly and it does the trick.
- Tuck the phone away. This is an easy mistake to make while you're thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to reject a petrol nozzle, and add-on devices are available for vehicles without one. They are a safety net, not a reason to stop checking the petrol pump.
- Noticing it halfway? Stop there and then. A weaker mix results from less petrol inside your tank, yet your next step remains the same: don't start the car.
Petrol already in a diesel around Feniscowles? Begin here
Short and simple, then, is the order of things. Leave it unstarted, with the ignition off too. The staff on the forecourt — whether at EG On the Move itself or wherever you filled up — will usually help roll it away from the petrol pump if you ask. What got in, about how much, and if it's run: tell us those when you ring 0333 366 0103.
Say so if it was AdBlue instead of petrol: it's a different fault, with its own page for Feniscowles, because AdBlue brings corrosion and deposits rather than lost lubrication.
Why one petrol in a diesel job in Feniscowles costs more than another
There is no fair single price for this, because the four situations above are four separate jobs. What moves your cost is chiefly which of them you're in. The proportion counts next, meaning how much of that tank is petrol, followed by the location of your car and whether getting to it is safe for our van.
Before any quote, not after, we ask three queries: the fuel that was put in, its volume, and if it has run. That is why. A range turns into a straight figure once those answers are in.
About Feniscowles, briefly
Feniscowles is a suburban area in Lancashire, situated on the riverside at an elevation of 111 metres, with semi-detached housing being the predominant type of accommodation. Feniscowles lies approximately 7 miles from Preston and 183.5 miles from London, placing it in a commuter-friendly location. Feniscowles is surrounded by nearby places such as Higher Broadhalgh, Cherry Tree, and Pleasington, and has a population of around 2715 residents. Feniscowles forms part of the wider urban area along the river, with its residents enjoying the local scenery.
Feniscowles and Lancashire: where our fuel drain cover reaches
Petrol in diesel call-outs around Feniscowles — part of the BB postcode area — go to teams that also cover the spots round it, Higher Broadhalgh, Cherry Tree and Pleasington included. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots our engineers work, and your vehicle doesn't need to come to us.
Still at the petrol pump in Feniscowles?
The best position there is, then — that is where you are. Turned off it stays; then ring.