Petrol in a Diesel Car in Bedwas: How Worried Should You Be?
Far less than you likely are, if it hasn't been started. Till the ignition primes the pump, your starter cranks, or the car is driven, petrol in a diesel tank just waits there and does nothing. Which means the honest reply to that first Bedwas query — "have I ruined it?" — normally no. Keep it like that: leave the motor off and call Petrol in Diesel. Read on for three things: the effect petrol has inside a diesel motor, the signs of how far it has got, and the way to make sure you never repeat it.
The motor and petrol in a diesel: what goes on
Two tasks fall to diesel on its journey round a motor. Oiling comes before burning; it does both. What keeps the surfaces inside your high-pressure pump and your injectors from wearing down against each other is the diesel flowing through them — they're built to very fine tolerances.
Of these two tasks, petrol manages the first badly and the second not at all. A pump running on a petrol mixture is wearing itself out, since petrol is thinner than diesel and strips out the lubrication the fuel system relies on. Petrol is also made to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that is where the clattering comes.
Taken together, they show the shape the trouble takes. It's circulation that causes the harm, not contact. All a tank with petrol in it amounts to is a fuel fault. Once your pump has been working on that petrol, a mechanical issue has begun: anything shed by a pump that's grinding is carried onward to your injectors with your fuel.
Petrol in a diesel in Bedwas: how serious is it? Four cases
Filled up, and never started: no case is better. On a forecourt, and really only there, that petrol is still limited to that tank — because anywhere else the car was driven to get to it. The task is emptying and rinsing on the spot.
A brief spell of running, or merely your ignition on. Petrol has left your tank and got to the filter and your lines, because the system has been bled. Still generally easy: drain, flush, and your filter seen to.
Driven a few miles. Now the pump has spent these miles running on thinned fuel. Distance is only half of it; how hard it was driven counts just as much. Either way this work includes that tank, your lines, the fuel filter and fresh fuel through the whole circuit. Driving the kids to the local primary school is one kind of trip. Any miles on the M4, under 5 miles from Bedwas, means the motor working hard throughout, and a run to Cardiff, under 10 miles away, makes a very different job as well.
Driven on until it complained — clattering, smoke, an uneven idle, a dead throttle. The fuel isn't acting like diesel any more, and the motor is saying so. Leave it wherever it has stopped: a lay-by, a side street, the verge on Church Street. A vehicle stopped early very rarely has lasting damage, because the drain and the flush, which still go first, sort it out.
Bedwas drivers and the petrol in a diesel stories they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing is removed when you top up — the tank simply holds more of the same blend. Percentage is not how a diesel fuel system tolerates petrol, however much that guidance supposes.
"Newer diesels can handle a little petrol" — a myth, and closer to the reverse. At higher pressure, through finer components: that's how a modern diesel moves its fuel, and so the lubrication matters for more, not less.
Myth: "If it starts and drives, there's no harm done." This is the one that fools drivers. Diesel in a petrol motor usually leaves a motor that won't run: the motorist stops, and so does the harm. A diesel fed petrol usually starts, idles and drives away as though nothing has happened, while your pump wears. Running is not the same as fine.
An old workaround for a separate fault lies behind this one. Myth: "Add some two-stroke oil and drive it home." The petrol is still in the tank after that, and what it has diluted is not put back.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol sits in the fuel filter and lines, waiting to go right back through your pump at the next start. On top of that, petrol drained into a can by the road is truly hazardous.
How does petrol in a diesel happen?
It's seldom carelessness, and no one does it on purpose. The forecourt makes it simple: the petrol nozzle is the smaller of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle mostly will not go into a petrol motor at all. So the slip runs one way.
The moment routine stops matching the vehicle is the moment it happens. A new motor, a hire car or a courtesy car. Households running one of each, petrol and diesel. Your usual forecourt, its pumps now in a different order. Rushing for a train outside Energlyn & Churchill Park and filling up en route. Years of petrol vehicles behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that is when. Your hand does 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 Bedwas: avoiding petrol in a diesel
- The label is what counts, and so read the pump rather than the colour: in the UK unleaded handles are usually green and diesel black, yet not on every forecourt.
- Plenty of cars state the fuel inside your filler flap or on the cap, and so check there on your first fill in a car you don't know.
- Mark your key. In a house with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- Before the nozzle comes off the pump the first time you fuel a hired or new car, say "diesel" aloud. Silly, yes, but it works.
- Mistakes like this are simple to make while your mind is on something else, so the phone goes away.
- Add-on devices are available for vehicles without one, and some diesels come with a filler that will not take a petrol nozzle. Useful — but a backstop at best, never a reason to stop checking the label.
- As soon as you notice, stop: less petrol in that tank means a weaker mixture. What to do next does not change, though — still do not crank it.
Petrol already in a diesel in Bedwas? Start here
Short and simple, then, is the order of things. Don't fire it up, and don't switch the ignition on. If you are still at the forecourt — Esso or anywhere else — ask the attendants to help you push the car away from the petrol pump. Next, 0333 366 0103. We'll ask what got in, about how much, and if it has been run.
If it was AdBlue and not petrol, say so. That is a different fault — corrosion and deposits instead of lost lubrication — and it has its own page for Bedwas.
Why one petrol in a diesel task in Bedwas costs more than another
Four different jobs lie behind the four situations above — which is why there is no honest single quote. Which of them you are in is mostly what shifts the cost. The proportion matters next, meaning how much of that tank is petrol, and then the location of your car and whether getting to it is safe for a technician.
That is why we ask three queries before pricing rather than after: what got in, how much, and whether it has run. Those answers turn a range into a straight figure.
About Bedwas
Bedwas is a village situated on the banks of the Rhymney River in south Wales, with a mix of semi-detached housing and local amenities. Bedwas lies close to the nearby communities of Mornington Meadows, Trethomas, and Lansbury Park, and is approximately 7.8 miles from Cardiff. Bedwas has a population of around 2576 people and is located at an elevation of 67 metres above sea level. Bedwas is also within commuting distance of major cities, including Cardiff and, further afield, London.
Across Caerphilly and in Bedwas: fuel drain cover
Our vans answering petrol in diesel calls around Bedwas, in the CF postcode area, equally work the locations near it, Mornington Meadows, Trethomas and Lansbury Park included. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots our engineers drain, and the car doesn't need to move to us.
In Bedwas and still at the petrol pump?
Then you're in the best position there is. Turned off it stays; then phone.