Petrol in a Diesel Car in Irvinestown: How Worried Should You Be?
Provided it hasn't been started, worry far less than you likely are. Until your ignition primes your pump, the starter turns, or the vehicle is driven, petrol in a diesel tank just waits there and does no harm. Which makes the truthful reply to the first Irvinestown query — "have I wrecked it?" — normally no. Leave the motor off then phone Petrol in Diesel — that is how you keep it that way. Further down, you will find what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you a second time.
Petrol in a diesel: what does it do to the motor?
Passing through a motor, diesel is doing two things at once. Before it ignites, it protects — and then it combusts. What stops the surfaces inside your high-pressure pump and the fuel injectors from wearing down against one another is the diesel flowing through them — they are made to extremely fine clearances.
Petrol handles the first task badly and the second not at all. A pump working on a petrol blend is wearing itself out, because petrol is runnier than diesel and takes away the lubrication the fuel system depends on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that's where the knocking starts.
The shape of the problem is clear when you put those together. Contact doesn't do the harm — movement does. 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 working on that petrol — and whatever a worn pump sheds travels on with your fuel to the injectors beyond it.
Four scenarios our technicians see in Irvinestown: how serious is petrol in a diesel?
The best case there is: filled up, never started. The petrol is inside that tank and only that tank, and the job is a drain and a flush where your car sits. This is the one situation that can only truly happen at a forecourt, as anywhere else your car has been driven to get there.
The ignition switched on, or a brief start. Once primed, your system has drawn petrol out of the tank up to the filter and the fuel lines. Normally little more than draining, purging and sorting your filter, so still easy.
A couple of miles driven, and your pump has spent every one of them labouring on thinned fuel. The work is your tank, the lines, the fuel filter and fresh fuel through the entire system, and how hard your car was driven counts as much as how far. On the school run to the local primary school, the distance is small. Very different again: a run to Derry, under 50 miles away, or any mileage on the M77, over 50 miles from Irvinestown, where your engine never stopped labouring hard.
Clattering, a lumpy idle, smoke, a throttle gone soft: driven till it complained. The engine is telling you the fuel is no longer acting like diesel. Leave it wherever it has stopped: a lay-by, a quiet street, the verge on Crown Street. Permanent damage is very uncommon when a vehicle is stopped quickly, and the fuel drain and flush that still go first sort it out.
Petrol in a diesel stories Irvinestown drivers hear
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Topping up removes nothing; it gives you a fuller tank of the same mix. The idea behind the guidance — that diesel fuel systems accept petrol by percentage — is wrong.
"Current diesels can handle a little petrol" — a myth, and nearer the opposite. A newer diesel sends its fuel through smaller parts at higher pressure, which makes the lubrication matter more, not less.
"It starts, it drives, and so there is no harm" — the myth that trips up more motorists than any other. Feed diesel to a petrol motor and it generally will not run, so the motorist stops — and the harm stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile your pump wears. Running doesn't mean fine.
An old workaround for a separate problem lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." What petrol has thinned remains weakened, and that petrol remains inside your tank regardless.
Once your engine has run, part of that petrol sits in your filter and the fuel lines, not that tank — and your next start pulls it straight back through your pump. So the myth "drain the tank yourself and you're sorted" doesn't hold. It is also genuinely hazardous to drain petrol into a can at the kerbside.
Petrol in a diesel: how does it occur?
On purpose? Never. Through carelessness? Seldom, if ever. One way only, because of the nozzles: the narrower petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly won't fit a petrol motor. That is how the forecourt makes it straightforward.
The moment habit stops matching the vehicle is the moment it happens. Hire cars, courtesy cars, and cars that are new to you. Two vehicles on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A train to catch, and a hurried fill on the way to the nearest station. Precisely the moment it takes place: after years of driving petrol, someone fills a diesel Renault Megane for the first time. Your hand does what it has always done once you add rain, a phone call or a back seat full of children.
Irvinestown people: how to prevent petrol in a diesel next time
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most generally do. Read the pump's label; the colour is only a clue.
- Check your filler flap. Plenty of vehicles state the fuel type inside the flap or on the cap. Look at it on the first fill in any motor you don't know.
- One of each in the household? Mark the key to the diesel — a coloured fob, a sticker — because intending to remember isn't enough.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It seems silly and it works.
- Put the phone away. This is an easy mistake to make whilst you are 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 motors without one. They are a backstop, not a reason to stop checking the pump.
- Stop as soon as you notice. Less petrol in that tank means a weaker mix. It does not change what to do next, which is still not to crank it.
Put petrol in a diesel in Irvinestown already?
Then, there's only a short order of things. Leave it unstarted, with your ignition off as well. If you're still on the forecourt — the nearest petrol station or anywhere else — ask the attendants to help you roll the vehicle clear of the pump. Ring 0333 366 0103 next, with three facts — the fuel, the rough amount, and if it's run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a separate problem — Irvinestown has a page all for it.
What makes one Irvinestown petrol in a diesel task cost more than the next
A fair single price does not exist here: four situations, four separate jobs. What shifts your cost is chiefly which of them you are in. Where the vehicle is counts too, and whether our van can safely reach it, after the share of petrol to what the tank holds.
What was put in, how much, and whether it's run — three questions our engineers ask before pricing, not after, for precisely that reason. Given those answers, there is a straight figure rather than a range.
About Irvinestown, for a moment
Irvinestown is a small locality in County Fermanagh, situated inland at an elevation of 88 metres. Irvinestown lies near the villages of Lisnarick, Killadeas, and Ballinamallard, and is approximately 38 miles from Derry. Irvinestown has a population of around 973 people, with a predominance of terraced housing. Irvinestown is located in the western part of Northern Ireland, about 373 miles from London.
Fuel drain cover across County Fermanagh, Irvinestown included
Irvinestown sits in the BT postcode area, and the vans that answer petrol in diesel jobs there work the locations near it as well — Lisnarick, Killadeas and Ballinamallard among them. We drain wherever your car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
In Irvinestown and still at the petrol pump?
Then, you could not be in a better position. Switched off it stays; then call.