Petrol in a Diesel Car in Moortown: How Worried Should You Be?
Probably less than you are now — provided nobody has started the car. Until the 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 honest reply to that first Moortown question — "have I ruined it?" — normally no. Petrol in Diesel is who to phone, with the engine left off, and so it stays that way. The rest of this page sets out what petrol really does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you a second time.
Your engine and petrol in a diesel: what happens
Two tasks fall to diesel on its journey round a motor. It combusts, and before it combusts it protects. Extremely fine clearances go into the injectors and your high-pressure pump, and just your diesel running through stops their surfaces grinding together.
Petrol handles the first task badly and the second not at all. The rattling comes from petrol being made not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection your system depends on, and any pump working on that mixture is wearing itself.
Taken together, they show the shape the issue takes. It is circulation that does the harm, not contact. Where that petrol is only in the tank, it is an issue of fuel, nothing more. Whatever a worn pump sheds travels on, carried by your fuel, into the fuel injectors downstream, which is why a pump that has worked on the petrol is where a mechanical issue starts.
How bad is petrol in a diesel? Four scenarios our technicians see in Moortown
Filled up, not once started. The best case there can be. On a forecourt, and really only there, the petrol is still limited to your tank — since anywhere else your car was driven to reach it. The task is emptying and purging on the spot.
The ignition switched on, or a short start. Once primed, the system has drawn petrol from the tank up to the filter and your lines. Still usually simple: drain, flush, and your filter dealt with.
Those few miles on the road meant your pump running on fuel thinned by petrol the whole way. Miles is only half of that; how hard it was driven matters equally. Either way the work includes that tank, the fuel lines, your filter and clean fuel through the entire circuit. Short trips, like the school run to the local primary school, are one matter. A run as far as Armagh, under 25 miles away, is a very different job. So is any mileage on the M77, over 50 miles from Moortown, where the engine has been working hard the whole time.
Driven on until it complained — rattling, smoke, a lumpy idle, a dead throttle. That's your motor telling you its fuel no longer is behaving like diesel. Leave it wherever it stops: a lay-by, a side street, the verge on Heugh Road. What comes first is still the fuel drain and flush, and that deals with it, with lasting damage very rare when a car is stopped soon.
Petrol in a diesel myths Moortown motorists hear
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing comes out when you top up — that tank just holds more of the same mixture. The assumption behind that advice — that diesel fuel systems accept petrol by percentage — is wrong.
"Current diesels can handle a little petrol" — a myth, and closer to the opposite. Lubrication matters more on newer diesels, not less, because their fuel passes through more precise parts at higher pressure.
One myth that catches drivers out: if it starts and drives, it must be unharmed. Any petrol engine fed diesel generally won't run, so the motorist stops and the damage stops with them. While the pump grinds, a diesel fed petrol usually starts, idles and drives away as if nothing has happened. Being able to run is not proof of being fine.
An old fix for a separate issue is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." That petrol is still in the tank after that, and whatever it has diluted isn't put back.
The next start draws petrol back round your pump out of the lines and the fuel filter, where some of that sits once the motor has been run. That is why draining your tank yourself does not sort it — a myth. Clearing petrol into a can at the kerbside is also truly risky.
Petrol in a diesel: how does it take place?
Carelessness is seldom the cause, and nobody means to do it. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol car at all. The forecourt makes it easy, and the slip runs one way.
The moment habit stops matching the vehicle is the moment it occurs. Hire cars, courtesy cars, and motors that are new to you. One petrol and one diesel on the drive of the same household. A forecourt you know, but with its pumps arranged differently. A hurried fill on the way to the nearest station with a train to catch. 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, the hand simply does what it always has.
How to prevent petrol in a diesel on your next fill-up in Moortown
- Check the pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on each forecourt. The label is what counts.
- Plenty of cars state the fuel inside your filler flap or on the cap, so check there on the first fill in a car you do not know.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of intending to remember, for a household with one of each.
- Before the nozzle leaves the petrol pump the first time you fuel a hired or new car, say "diesel" out loud. Silly, perhaps, but it works.
- Whilst you're thinking about something else, this is an easy mistake to make — so put the phone away.
- Some diesels have a filler built to reject a petrol nozzle, and devices you can add are available for cars 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 thinner mixture follows from less petrol in your tank, yet the next step stays the same: don't crank it.
Put petrol in a diesel around Moortown already?
The order of things is brief, then. Leave it unstarted, with the ignition switched off as well. Still at the forecourt, at the nearest petrol station or anywhere else? Ask the attendants to help you push it clear of the pump. Next, 0333 366 0103. We will ask what was put in, about how much, and if it has been run.
If it was AdBlue rather than petrol, say so. That's a separate problem — corrosion and deposits and not lost lubrication — and it has its own page for Moortown.
What makes one Moortown petrol in a diesel task cost more than the next
An honest single quote does not exist here: four situations, four separate jobs. What shifts your cost is mostly which of them you are in. Two things follow that: the petrol that was put in as a proportion of what your tank takes, then the place the car is in and whether a van can get to it safely.
That's why we ask three questions before quoting rather than after: what got in, how much, and whether it's run. Those replies are what change a range into one firm number.
About Moortown, briefly
Moortown is a small locality in County Tyrone, situated inland at a low elevation of 21 metres. Moortown lies near the villages of Ardboe and Coagh, and is approximately 20 miles from the city of Armagh. Moortown has a population of around 667 people, predominantly living in detached housing. Moortown is also relatively distant from major cities, with London being around 342 miles away.
Fuel drain cover in Moortown and across County Tyrone
Moortown waits in the BT postcode area, and our vans that answer petrol in diesel jobs there work the locations around it as well — Ardboe, Derrycrin and Coagh among them. The vehicle does not need to move to us: we drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
In Moortown and still at the petrol pump?
Nothing beats it: that is where you are. Keep it off. Ring.