How Worried Should You Be? Petrol in a Diesel Car in Guilsborough
Less than you probably are, provided it hasn't been started. Petrol sitting in a diesel tank does nothing to the motor till something pulls it through your fuel system — your ignition priming the pump, the starter, or the drive itself. So the fair answer to the first query anyone in Guilsborough asks, "have I wrecked it?", is usually no. Petrol in Diesel is who to phone, with your engine kept off, and so it stays that way. Below, you will find what petrol really does inside a diesel, how far it might have gone, and how to stop it happening to you again.
What petrol in a diesel does to the engine
Passing through a motor, diesel does two jobs at once. Oiling comes before burning; it does both. What keeps the surfaces inside the high-pressure pump and the injectors from wearing against one another is your diesel passing through them — they're designed to very fine clearances.
Badly at the first, not at all at the second: that is petrol. It's thinner than diesel and strips away the lubrication the fuel system hinges on, so a pump running on a petrol mixture is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the rattling comes from.
The shape of the issue is plain once you put those together. The damage is done by movement, not by contact. All a tank with petrol in it amounts to is a fuel issue. 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 your fuel to the injectors downstream.
How serious is petrol in a diesel? Four scenarios our technicians see in Guilsborough
Fuelled but not once started — the best it gets. The petrol is inside that tank and only the tank, and the task is a drain and a flush where the car stands. This is the one situation that can only truly happen at a forecourt, because anywhere else the car has been driven to get there.
A moment's running, or just your ignition on. With your system primed, the lines and filter now hold petrol that has come from your tank. That's usually still an easy job — a drain, a flush, and the fuel filter dealt with.
Those few miles on the road meant your pump working on fuel thinned by petrol throughout. Tank, lines, filter, then clean fuel run through the whole system: that is this work, and the way the vehicle was driven counts as much as the mileage. Short trips, like the school run to Guilsborough Church of England Primary School, are one thing. Any miles on the M1, under 10 miles from Guilsborough, means the engine working hard throughout, and a run to Leicester, under 25 miles away, is a very different job as well.
Driven on until it protested — rattling, smoke, an uneven idle, a soft throttle. The fuel isn't behaving like diesel any more, and the motor is saying so. Leave it wherever it stops: a lay-by, a side street, the verge on Ashby Court. The fuel drain and flush-through still come first, and they deal with it: if a car is stopped quickly, permanent damage is very unusual.
What Guilsborough drivers get told about petrol in a diesel — and the stories in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." A fuller tank of the same mixture is all it gives, since topping up removes nothing. Percentage is not how a diesel fuel system copes with petrol, however much that advice supposes.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. Lubrication counts more on newer diesels, not less, because their fuel passes through finer components at higher pressure.
Myth: "If it starts and drives, there is no harm done." This is the one that catches drivers. The motorist of a petrol motor fed diesel normally stops, since it will not run, and the harm stops with them. Feed petrol to a diesel and it generally starts, ticks over and drives away as if nothing has happened — all while its pump wears. Fine and running are not the same thing.
Not so: a two-stroke additive lets you to drive home. It is an old workaround, supposed for another problem. That petrol is still in the tank after that, and whatever it has thinned is not put back.
If the engine has been run, part of the petrol sits in your filter and your lines, not that tank — and the next start sends it straight back through your pump. So the myth "drain that tank yourself and you're sorted" doesn't hold. It is also truly dangerous to drain petrol into a can at the roadside.
Petrol in a diesel: how does it occur?
It is rarely carelessness, and nobody does it on purpose. The forecourt makes it simple: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle generally will not go into a petrol vehicle at all. So the error runs one way.
When routine and the vehicle stop matching, it takes place. Hire cars, courtesy cars, and motors that are new to you. Households running one of each, petrol and diesel. The pumps in a different order on a familiar forecourt. Racing for a train at Long Buckby and filling up en route. The first fill-up in a diesel Renault Megane after years of driving petrol is precisely the moment it takes place. With rain, a call coming in, or children to deal with, your hand just does what it always has.
Next time you fill up in Guilsborough: avoiding petrol in a diesel
- Green for unleaded and black for diesel is normal in the UK — but not on every forecourt. Go by the label on the pump, not the colour.
- The first fill in a strange motor is the time to check your filler flap — inside it, or on the cap, plenty of motors state which fuel to use.
- Mark your key. In a household with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- It sounds daft and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away then keep your mind on the petrol pump.
- Some diesels come with a filler built to reject a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the petrol pump.
- Spotting it mid-fill? Stop there and then. A weaker mix follows from less petrol inside your tank, yet the next stage remains the same: don't crank it.
Already put petrol in a diesel in Guilsborough?
Then the order of things is short. Do not switch the ignition on, and do not fire it up. Ask the staff to help you roll it clear of the petrol pump if you are still at the forecourt, whether that's Inver or anywhere else. Next, 0333 366 0103. We'll ask what got in, roughly how much, and if it has been run.
Say so if it was AdBlue instead of petrol: it's a different problem, with its own page for Guilsborough, because AdBlue brings corrosion and deposits instead of lost lubrication.
What makes one Guilsborough petrol in a diesel task cost more than the next
Four different jobs sit behind the four situations above — which is why there is no fair single price. Which of them you are in is chiefly what moves your cost. Next it's the ratio — how much petrol went in against how much the tank takes — and then where the vehicle is and whether a van can reach it safely.
What was put in, how much, and whether it has run — three queries our technicians ask before quoting, not after, for precisely that reason. With the answers, there is a straight figure rather than a range.
About Guilsborough itself
Guilsborough is a small village in Northamptonshire, situated in the East Midlands region of England, with a population of around 733 people. Guilsborough sits at an elevation of 173 metres, approximately 20 miles from Leicester and 69.5 miles from London. Guilsborough is characterised by its predominantly detached housing stock, and is located near other villages such as Coton, Hollowell, and Thornby. Guilsborough remains a quiet, rural community with a strong sense of local identity.
Fuel drain cover in Guilsborough and across Northamptonshire
Guilsborough rests in the NN postcode area, and the vans that answer petrol in diesel jobs there work the spots near it as well — Coton, Hollowell and Thornby among them. The car doesn't 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.
Still at the petrol pump around Guilsborough?
Then, you could not be in a better spot. Keep it off. Call.