Moneyreagh: Petrol in a Diesel Car? How Worried to Be
Probably less than you are now — as long as nobody has started the car. Everyone around Moneyreagh begins with "have I ruined it?", and the fair answer is usually no: petrol left inside that tank of a diesel stays harmless until priming, cranking or driving draws it into your fuel system. To keep the car like that, phone Petrol in Diesel then leave your engine switched off. Read on for three things: the effect petrol has inside a diesel motor, the clues of how far it has got, and ways to make sure you never repeat it.
What petrol in a diesel does to the engine
Diesel does two jobs on its way through an engine. It ignites, and before it ignites it lubricates. Extremely fine gaps are built into the injectors and the high-pressure pump, and only your diesel running through stops those surfaces grinding together.
Badly at the first, not at all at the second: that's petrol. Being less viscous than diesel, petrol strips out the protection a fuel system needs, leaving a pump running on the blend wearing itself. It is equally made to resist igniting under compression — the opposite of what a diesel needs — which is where you get the rattling.
Put these together and the shape of the problem is clear. It is circulation that does the damage, not contact. Petrol in a tank is a fuel problem. Whatever a worn pump sheds travels on, carried by the fuel, into the injectors further along, which is why a pump that has been working on the petrol is where a mechanical issue begins.
Petrol in a diesel in Moneyreagh: how serious is it? Four situations
The best case there is: filled up, not once started. On a forecourt, and really only there, the petrol is still limited to the tank — since everywhere else the vehicle was driven to reach it. The task is emptying and purging on the spot.
A moment's running, or just the ignition on. Once primed, the fuel system has pulled petrol from that tank as far as the filter and the lines. Drain, flush, deal with the filter: still usually easy.
A couple of miles driven, and your pump has spent each of them labouring on weakened fuel. Distance is only half of that; how hard it was driven matters just as much. Either way the work runs to your tank, the fuel lines, the fuel filter and fresh fuel through the entire circuit. Driving the kids to the local primary school is one kind of trip. Very different again: a trip to Belfast, under 10 miles away, or some miles on the M77, over 50 miles from Moneyreagh, where your engine kept labouring hard.
Driven until it protested. Knocking, a lumpy idle, smoke, a throttle that has gone soft. The engine is telling you your fuel is no longer acting like diesel. Whether it is the verge on Dunskey Street, a lay-by or a side street, stop where you are and leave it. Lasting damage is very unusual if a vehicle is pulled over soon, and the fuel drain and flush that still go first take care of it.
Myths Moneyreagh 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'll be." Nothing is removed when you top up — the tank just carries more of the same blend. Percentage is not how a diesel fuel system tolerates petrol, whatever that guidance supposes.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." At higher pressure, through smaller components: that is how a current diesel handles its fuel, and so the lubrication counts more, not less.
"It starts, it drives, so there is no harm" — the myth that catches more motorists than any other. Feed diesel to a petrol engine and it generally won't run, and so the driver stops — and the damage stops with them. A diesel fed petrol usually starts, ticks over and drives away as if nothing has happened, whilst the pump wears. A running engine does not mean fine.
An old fix for a different issue lies behind this one. Myth: "Add some two-stroke oil and drive the car home." What petrol has thinned stays diluted, and the petrol remains in your tank anyway.
"Drain it yourself and you are sorted" — a myth, since after it's been running some petrol lies in your filter and lines, waiting to go right back through the pump at your next start. Clearing petrol into a can by the roadside is also really hazardous.
Petrol in a diesel: how does it happen?
On purpose? Never. Through carelessness? Seldom, if ever. 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 car at all. So the slip runs one way.
When habit and the vehicle stop matching, it occurs. Courtesy car, hire car, or a vehicle that is new. A household with one petrol and one diesel on the driveway. A forecourt you know, only with its pumps laid out differently. A rushed fill on the way to the nearest station with a train to catch. Exactly the moment it takes place: after years of driving petrol, someone fills a diesel Renault Megane for the first time. The hand repeats what it has always done once you add rain, a phone call or a back seat full of children.
Next time you fill up in Moneyreagh: avoiding petrol in a diesel
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most usually do. Check the pump's label; the colour is just a clue.
- Many cars state the fuel inside the filler flap or on the cap, so check it on your first fill in a vehicle you do not know.
- A coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember, for a household with one of each.
- It seems daft and it works: on the first fill in a new or hired car, say "diesel" out loud before you take 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 pump.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to reject a petrol nozzle, and add-on devices exist for cars without one. They are a safety net, not a reason to stop checking the pump.
- Noticing it halfway? Stop there and then. A thinner mixture follows from less petrol inside your tank, but your next step remains the same: don't fire it up.
Already put petrol in a diesel around Moneyreagh?
Then the order of things is brief. Starting it is out, and so is switching on the ignition. If you are still at the forecourt — the nearest petrol station or anywhere else — ask the attendants to help you push it clear of the petrol pump. Then call 0333 366 0103 and tell us what was put in, roughly how much, and if it's run.
Say so if it was AdBlue instead of petrol: it's a separate issue, with its own page for Moneyreagh, since AdBlue brings corrosion and deposits instead of lost protection.
One petrol in a diesel job in Moneyreagh costs more than another. Why?
There's no honest single quote for this, since the four situations above are four separate tasks. Mostly, your cost moves with which situation you're in. The ratio matters next, meaning how much of that tank is petrol, and then the location of the vehicle and whether reaching it is safe for a van.
That is why we ask three questions before pricing rather than after: what went in, how much, and whether it has run. Those replies are what change a range into one firm number.
About Moneyreagh itself
Moneyreagh is a locality situated inland in County Down, approximately 5.9 miles from Belfast. Moneyreagh sits at an elevation of 92 metres, surrounded by nearby places such as Carryduff, Ballygowan, and Comber. Moneyreagh has a population of around 1594 people, predominantly residing in detached housing. Moneyreagh is located about 315.9 miles from London, making it a relatively distant suburb of Belfast.
Moneyreagh and County Down: where our fuel drain cover runs
Moneyreagh sits in the BT postcode area, and our vans that answer petrol in diesel call-outs there work the places near it as well — Carryduff, Ballygowan and Comber among them. No need to move the car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots where we work.
At the pump around Moneyreagh, right now?
The best position there is, then — that's where you are. Turned off it remains; then call.