Blaina: Petrol in a Diesel Car? How Worried to Be
Likely less than you already are — as long as nobody has started it. Petrol sitting in a diesel tank does nothing to the engine until something draws it through your fuel system — the ignition priming your pump, the starter, or the drive on its own. So the honest answer to the first question anyone in Blaina asks, "have I ruined it?", is usually no. Petrol in Diesel is who to ring, with your motor kept off, so it remains that way. Keep reading for three things: the effect petrol has inside a diesel engine, the clues of how far it has spread, and ways to make sure you don't repeat it.
Inside your engine: what petrol in a diesel does
On its way through an engine, diesel does two jobs. Before it ignites, it lubricates — then it burns. The high-pressure fuel pump and the fuel injectors are made to very fine clearances, and your diesel passing through them is what stops those surfaces from grinding against one another.
Petrol handles the first job poorly and the second not at all. The knocking comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips away the lubrication your system rests on, and any pump working on that blend is wearing itself.
Put those together and the shape of the trouble is clear. It's movement that causes the harm, not contact. All a tank with petrol in it amounts to is a fuel issue. The beginning of a mechanical problem is a pump that has been labouring on that petrol — and whatever a worn pump sheds travels on with your fuel to your injectors beyond it.
Petrol in a diesel in Blaina: how serious is it? Four cases
Filled up, never started. The best case there is. Being on a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With the petrol kept inside that tank alone, it's drained and flushed on the spot, and nothing more is needed.
Your ignition turned on, or a short start. Once primed, the system has drawn petrol from your tank as far as your filter and the fuel lines. Still normally straightforward: drain, flush, and your filter seen to.
A couple of miles driven, and your pump has spent every one of them running on diluted fuel. Distance is only half of it; how hard it was driven matters equally. Either way the work includes your tank, the lines, your filter and clean fuel through the whole circuit. A school run to the local primary school is one thing. Any mileage on the M4, under 15 miles from Blaina, means the engine working hard throughout, and a run to Newport, under 15 miles away, is a very different job too.
Driven till it complained. Knocking, an uneven idle, smoke, a throttle that has gone soft. The motor is telling you your fuel is no longer acting like diesel. Whether it's the verge on Queen Street, a lay-by or a side road, stop where you are then leave it. A vehicle stopped early very rarely has long-term damage, because the drain and the flush, which still go first, deal with it.
Stories Blaina 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." Topping up takes out nothing; it gives you a bigger tank of the same mixture. The assumption behind that advice — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. At higher pressure, through more precise parts: that's how a modern diesel moves its fuel, and so the lubrication matters more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that catches drivers. The driver of a petrol motor fed diesel usually has no choice but to stop, since it will not run, and the harm stops with them. Whilst the pump grinds, a diesel fed petrol usually starts, idles and drives away as though nothing has happened. Being able to run isn't the same as being fine.
Not so: a two-stroke additive makes it safe to drive home. It is an old workaround, meant for another problem. It does not put back what petrol has weakened, and the petrol is still in that tank later on.
Myth: "Drain your tank yourself and you are sorted." Once the engine has run, some of the petrol is no longer in the tank: it is in your filter and the lines, and it goes straight back through the pump at the next start. It is also truly risky to drain petrol into a can by the kerbside.
Petrol in a diesel: how does it happen?
On purpose? Never. Through carelessness? Seldom, if ever. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol vehicle at all. The forecourt makes it simple, and the error runs one way.
Routine and the vehicle getting out of step is when it happens. Any car that is new to you — hired, on loan as a courtesy car, or just bought. A household with one petrol and one diesel on the drive. A forecourt you know, but with its pumps arranged differently. A hurried fill on the way to Ebbw Vale Parkway with a train to catch. The first fill-up in a diesel Volkswagen Passat after years of driving petrol is precisely the moment it takes place. Add a back seat full of kids, a phone call or rain, and the hand wins.
Blaina motorists: how to avoid petrol in a diesel next time
- The label is what counts, so check the pump rather than the colour: in the UK unleaded handles are usually green and diesel black, but not on each forecourt.
- In a motor you don't know, look inside the flap over the filler or at the cap before the first fill: many vehicles print the fuel there.
- Mark the key. In a home with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- "Diesel", aloud, before you pick up the nozzle — every time a new or hired car needs its first tank. It sounds daft. It does the trick.
- Thinking about something else is when this becomes an easy mistake to make, and so put your phone away then keep your mind on the pump.
- Add-on devices are available for vehicles without one, and some diesels come with a filler that won't take a petrol nozzle. Helpful — but a safety net only, never a reason to stop checking the label.
- Less petrol means a thinner mixture, so stop as soon as you notice — while remembering that your next step is unchanged. It is still not to crank it.
Petrol already in a diesel around Blaina? Start here
Then the order of things is brief. Don't switch your ignition on, and don't fire it up. Ask the attendants to help you push it away from the pump if you're still at the forecourt, whether that is Texaco or anywhere else. Then phone 0333 366 0103 and tell us what got in, roughly how much, and whether it has run.
If it was AdBlue rather than petrol, say so. That's a different fault — corrosion and deposits rather than lost lubrication — and it has its own page for Blaina.
One petrol in a diesel task in Blaina costs more than another. Why?
Four different jobs sit behind the four scenarios above — which is why there is no honest single quote. What shifts the cost is mostly which of them you're in. Two things follow that: the petrol that got in as a proportion of what your tank takes, then the spot the car is in and whether a technician can reach it safely.
Before any quote, not after, we ask three questions: the fuel that went in, the quantity, and if it's run. That's why. Those replies change a range into a straight figure.
About Blaina and its setting
Blaina is a town situated in the county of Blaenau Gwent, Wales, with a lakeside setting and an elevation of 282 metres. Blaina lies near the communities of West Side, Cwmcelyn, and Coedcae, and is approximately 14 miles from Newport. Blaina has a population of around 5531 people, predominantly living in terraced housing. Blaina is located in a region of south Wales, about 131 miles from London.
Fuel drain cover in Blaina and across Blaenau Gwent
Our vans answering petrol in diesel jobs around Blaina, in the NP postcode area, also work the places near it, West Side, Cwmcelyn and Coedcae among them. No need to bring your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations where we work.
Still at the pump around Blaina?
Then, you couldn't be in a better spot. Turned off it stays; then call.