Petrol in a Diesel Car in Glenoe: How Worried Should You Be?
Not started? Then less anxious than you probably feel. Petrol resting in a diesel tank does nothing to the motor until something pulls it through your fuel system — your ignition priming your pump, the starter, or the drive itself. So the fair answer to the first query everyone around Glenoe asks, "have I wrecked it?", is usually no. To keep it like that, ring Petrol in Diesel then leave your motor alone. Below, you will find what petrol actually does inside a diesel, how far it may have gone, and how to stop it happening to you again.
The motor and petrol in a diesel: what goes on
Diesel does two tasks on its way through a motor. Before it combusts, it protects — then it combusts. Very fine gaps are built into the injectors and the high-pressure pump, and just the diesel running through stops their surfaces grinding together.
Badly at the first, not at all at the second: that is petrol. 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 out the protection the fuel system depends on, and any pump running on such a mix is wearing itself.
Taken together, they show the shape the issue takes. Not contact but circulation is what does the damage. All a tank with petrol in it amounts to is a fuel fault. The start of a mechanical problem is a pump that has been running on that petrol — and whatever a worn pump sheds travels on with your fuel to the injectors downstream.
Four scenarios our engineers see around Glenoe: how serious is petrol in a diesel?
Fuelled, and never started: nothing beats it. At a forecourt, and really only there, the petrol is still limited to the tank — because everywhere else the car was driven to reach it. The job is emptying and cleaning on the spot.
A brief spell of running, or just the ignition on. Once primed, the system has drawn petrol from the tank up to the filter and the lines. Drain, flush, deal with your filter: still usually straightforward.
Driven a couple of miles. Now your pump has spent those miles labouring on thinned fuel. How hard your car was driven matters as much as how far, and this work takes in your tank, the lines, the filter and fresh fuel through the whole circuit. The school run to the local primary school is one thing. Any miles on the M77, over 50 miles from Glenoe, means the motor has worked hard throughout, and a run to Belfast, under 15 miles away, makes a very different task as well.
Driven till it protested. Knocking, an uneven idle, smoke, a throttle that has gone soft. The motor is telling you your fuel is no longer behaving like diesel. Whether it's the verge on Heugh Road, a lay-by or a side road, stop where you are then leave it. What goes first is still the fuel drain and flush, and that deals with it, with permanent damage very uncommon when a car is pulled over soon.
Petrol in a diesel stories Glenoe motorists hear
False: topping up to full with diesel makes it fine. It doesn't. A bigger tank of the same mixture is all you get, since topping up removes nothing. The assumption behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong.
Not so: a modern diesel copes with a bit of petrol. Rather, the reverse. More precise components and higher pressure are the way a current diesel runs its fuel, and that makes the protection count more, not less.
This is the one that catches drivers. Myth: "If it starts and drives, there's no damage done." Feed diesel to a petrol motor and it normally won't run, and so the driver stops — and the harm stops with them. Whilst the pump grinds, a diesel fed petrol usually starts, ticks over and drives away as if nothing has happened. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive it home." It's an outdated fix for a separate problem. The petrol is still inside your tank afterwards, and what it has thinned is not put back.
Myth: "Drain your tank yourself and you're sorted." Once the engine has run, some of that petrol is no longer in the tank: it's in your filter and your lines, and it goes right back through the pump on your next start. It is also really dangerous to drain petrol into a can at the roadside.
How does petrol in a diesel take place?
On purpose? Never. Through carelessness? Seldom, if ever. One way only, since of the nozzles: the slimmer petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol car. That's how the forecourt makes it straightforward.
It occurs when habit and the vehicle stop matching. A new vehicle, a hire car or a courtesy car. One petrol and one diesel on the drive of the same household. Your normal forecourt, its pumps suddenly in a different order. A train to catch, and a rushed fill en route to the nearest station. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist used to petrol: precisely when it happens. Throw in a back seat full of kids, a phone call or rain, and the hand takes over.
Next time you fill up in Glenoe: avoiding petrol in a diesel
- Check the pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on every forecourt. The label is what matters.
- The first fill in a strange vehicle is the time to check your filler flap — on it, or on the cap, plenty of vehicles state the fuel they take.
- Label 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.
- "Diesel", out loud, before you lift the nozzle — each time a new or hired car gets its first tank. It seems daft. It works.
- Put your phone away. This is an easy mistake to make whilst you are thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to block a petrol nozzle, and aftermarket devices are available for the remainder. Count it as a backstop, then keep checking the petrol pump.
- Less petrol makes a thinner mixture, and so stop the moment you notice — while remembering that your next step is unchanged. It is still not to crank it.
Already put petrol in a diesel in Glenoe?
Then the order of things is brief. Do not switch the ignition on, and don't fire it up. Still at the forecourt, at the nearest petrol station or anywhere else? Ask the attendants to help you push the vehicle away from the petrol pump. Call 0333 366 0103 next, with three answers — your fuel, the approximate volume, and if it has run.
If it was AdBlue instead of petrol, say so. That is a separate issue — corrosion and deposits rather than lost lubrication — and it has its own page for Glenoe.
Glenoe petrol in a diesel tasks: why one costs more than another
There's no fair single price for this, since the four scenarios above are four separate jobs. The situation itself does most of the work of moving the cost. Where the vehicle is counts too, and whether a van can safely get to it, after the share of petrol to what the tank takes.
Ahead of any quote, not after, come three queries: the fuel that went in, the volume, and if it's run. That is why. Given those answers, you get a straight figure instead of a range.
About Glenoe and its setting
Glenoe is a coastal locality in County Antrim, situated near the villages of Glynn and Magheramorne, with Mounthill to the south. Glenoe sits at an elevation of 107 metres, overlooking the coastline of Northern Ireland, and is located approximately 14.6 miles from Belfast. Glenoe is characterised by its predominantly detached housing stock, reflecting its residential nature. Glenoe remains a small community with a population of around 786 people.
Across County Antrim and around Glenoe: fuel drain cover
Petrol in diesel calls in Glenoe — part of the BT postcode area — go to teams that likewise cover the spots around it, Glynn, Mounthill and Magheramorne included. You need not move the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places we drain.
In Glenoe and still at the petrol pump?
Then, you couldn't be in a better position. Keep it off. Call.