How Worried Should You Be? Petrol in a Diesel Car in Brockagh
Provided it has not been started, worry far less than you probably are. "Have I wrecked it?" is the first question everyone around Brockagh asks, and the truthful answer is normally no, since petrol left in a diesel tank hurts nothing till it is dragged through the system — by ignition priming, by the starter, or by driving. Leave the motor off then phone Petrol in Diesel — that is how you keep it like that. Further down, 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 engine: what petrol in a diesel does
Two jobs fall to diesel on its route through a motor. It lubricates first, and after that does it burn. The high-pressure fuel pump and your injectors are made to extremely fine gaps, and your diesel passing through them is what keeps those surfaces from wearing against one another.
Of those two jobs, petrol manages the first poorly and the second never. It is thinner than diesel and strips away the protection the fuel system depends on, and so a pump running on a petrol mix is a pump wearing itself. And petrol is made to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That is where the clattering comes from.
Put these together and the shape of the issue is clear. Not contact but circulation is what causes the harm. Where that petrol is only in the tank, it's an issue of fuel, nothing more. After the pump has been running on that petrol, a mechanical problem has started: anything shed by a pump that is wearing travels downstream to the fuel injectors with your fuel.
How serious is petrol in a diesel? Four situations our engineers see in Brockagh
Fuelled up, not once started. The best case there is. The petrol is in the tank and just your tank, and the task is a drain and a flush where the vehicle stands. This is the one scenario that can only truly occur on a forecourt, since anywhere else the car has been driven to get there.
Started for a second, or just the ignition on. Once primed, your system has drawn petrol out of your tank as far as the filter and the fuel lines. Drain, flush, see to the fuel filter: still usually simple.
Driven a few miles. Now the pump has spent these miles running on weakened fuel. How hard the vehicle was driven matters as much as how far, and the work covers that tank, the lines, the filter and fresh fuel through the entire system. Short trips, such as the school run to the local primary school, are one thing. A run as far as Armagh, under 15 miles away, is a very different job. So is any mileage on the M77, over 50 miles from Brockagh, where your engine has been working hard the whole time.
It complained, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone lumpy. What you are hearing is your engine reporting fuel that no longer acts like diesel. Whether it's the verge on Heugh Road, a lay-by or a side street, stop where you are then leave it. Permanent damage is very rare if a vehicle is stopped quickly, and the fuel drain and flush that still go first take care of it.
Stories Brockagh people hear about petrol in a diesel
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 mix is all you get, since topping up removes nothing. That advice supposes a diesel fuel system tolerates petrol by percentage. It does not.
"Current diesels can handle a little petrol" — a myth, and nearer the opposite. Protection counts more on current diesels, not less, since their fuel passes through more precise parts at higher pressure.
This is the one that catches motorists. Myth: "If it starts and drives, there's no damage done." The driver of a petrol motor fed diesel usually stops, since it will not run, and the harm stops there. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile the pump wears. Running is not the same as fine.
Not so: a two-stroke additive lets you to drive home. It is an old fix, meant for another problem. It does not put back what petrol has thinned, and that petrol is still inside that tank afterwards.
Myth: "Drain the tank yourself and you're sorted." Once the engine has been run, some of that petrol is no longer inside your tank: it is in the fuel filter and the lines, and it goes right back through your pump at your next start. On top of that, petrol emptied into a can by the road is truly dangerous.
Petrol in a diesel: how does it happen?
No one does it on purpose, and it's rarely carelessness. The petrol nozzle is the smaller of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol car at all. The forecourt makes it easy, and the error runs one way.
It happens when habit and the car stop matching. Courtesy car, hire car, or a car that is brand new. Two motors on one drive, one petrol, one diesel. Your usual forecourt, its pumps suddenly in a different order. Filling up in a rush en route to the nearest station, with a train to catch. A new-to-you diesel Audi A4, its first fuelling, and a motorist accustomed to petrol: precisely when it occurs. Your hand does what it has always done once you add rain, a phone call or a back seat full of kids.
Brockagh people: how to avoid petrol in a diesel next time
- Read the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on each forecourt. The label is what counts.
- Many cars state the fuel inside the filler flap or on the cap, and so check it on the first fill in a motor you don't know.
- One of each in the home? Label your key to the diesel — a bright fob, a sticker — since meaning to remember isn't enough.
- "Diesel", out loud, before you lift the nozzle — each time a new or hired car gets its first tank. It sounds daft. It works.
- Put your phone away. This is an easy mistake to make whilst you're thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to block a petrol nozzle, and add-on devices exist for cars without one. They are a backstop, not a reason to stop checking the petrol pump.
- Noticing it mid-fill? Stop there and then. A weaker blend follows from less petrol in that tank, yet the next step stays the same: don't start the vehicle.
Petrol already in a diesel in Brockagh? Start here
The order of things is short, then. Don't switch your ignition on, and do not start it. Yet at the forecourt, at the nearest petrol station or anywhere else? Ask the attendants to help you roll the vehicle clear of the petrol pump. Next, 0333 366 0103. We will ask what was put in, about how much, and if it's been run.
If it was AdBlue instead of petrol, say so. That is a different problem — corrosion and deposits instead of lost lubrication — and it has its own page for Brockagh.
One petrol in a diesel task in Brockagh costs more than another. Why?
A fair single quote does not exist here: four situations, four separate tasks. What moves your cost is chiefly which of them you're in. Where the car is matters too, and whether a technician can safely reach it, after the proportion of petrol to what that tank takes.
What got in, how much, and whether it's run — three queries our engineers ask before quoting, not after, for exactly that reason. The replies turn a range into a straight figure.
About Brockagh itself
Brockagh is a small locality in County Tyrone, situated inland near the shores of Lough Neagh. Brockagh sits at a low elevation of around 12 metres, close to the nearby settlements of Mountjoy and Washing Bay. Brockagh is characterised by its predominantly detached housing stock, reflecting its rural setting. Brockagh is located approximately 14 miles from the city of Armagh, and some 341 miles from London.
Fuel drain cover across County Tyrone, Brockagh included
Petrol in diesel calls around Brockagh — part of the BT postcode area — go to teams that also cover the places about it, Mountjoy, Washing Bay and Acton among them. No need to bring your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations we drain.
Still at the petrol pump around Brockagh?
No position is better: that's where you are. Ring, and leave it switched off.