How Worried Should You Be? Petrol in a Diesel Car in Ripponden Wood
Provided it hasn't been started, worry less than you probably are. Everyone in Ripponden Wood begins with "have I wrecked it?", and the honest answer is generally no: petrol left in that tank of any diesel stays harmless till priming, cranking or driving pulls it into your fuel system. Keep it that way: leave your engine off and call Petrol in Diesel. Keep reading for three things: the effect petrol has inside a diesel engine, the signs of how far it has spread, and the way to make sure you never do it again.
What petrol in a diesel does to the engine
Two tasks fall to diesel on its route through a motor. Lubricating comes before burning; it does both. The high-pressure fuel pump and the injectors are built to very fine clearances, and the diesel passing through them is what keeps those surfaces from wearing down against each other.
Of those two tasks, petrol manages the first poorly and the second not at all. Being less viscous than diesel, petrol strips away the protection a fuel system needs, so a pump on the blend to wear itself. It is also made to resist igniting under compression — the opposite of what a diesel needs — which is why you get the knocking.
Taken together, they show the shape the problem has. The harm is done by movement, not by contact. Where the petrol is only inside that tank, it's an issue of fuel, nothing more. The beginning of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with the fuel to your injectors downstream.
Four scenarios our technicians see in Ripponden Wood: how bad is petrol in a diesel?
Filled up, not once started. The best case there is. Being on a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With the petrol kept inside your tank alone, it is emptied and cleaned on the spot, and nothing more is needed.
Started for a second, or only the ignition on. With your system primed, the fuel lines and filter now contain petrol that has come from that tank. Still generally simple: drain, flush, and your filter sorted.
The pump has worked a few miles on diluted fuel — that's what driving it meant. Tank, lines, filter, then clean fuel put through the whole system: that's the work, and the way your car was driven matters as much as the distance. On the school run to Ripponden Junior and Infant School, the miles is short. Very different once more: a run to Bradford, under 15 miles away, or some mileage on the M62, under 3 miles from Ripponden Wood, where the motor never stopped labouring hard.
Driven till it protested. Rattling, a ragged idle, smoke, a throttle that has gone soft. What you are hearing is your motor reporting fuel that no longer behaves like diesel. Pull up wherever you are — the verge on Coronation Terrace, a lay-by, a side street — and leave it there. Permanent damage is very unusual if a car is pulled over quickly, and the drain and flush-through that still go first sort it out.
Ripponden Wood motorists and the petrol in a diesel stories they hear
False: topping up to full with diesel makes it fine. It doesn't. A bigger tank of the same mix is all it gives, because topping up takes out nothing. The assumption behind the advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. At higher pressure, through smaller parts: that is how a newer diesel handles its fuel, and so the protection counts more, not less.
"It starts, it drives, and so no harm done" — the myth that trips up most people than any other. Feed diesel to a petrol engine and it generally won't run, and so the motorist stops — and the harm stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile the pump wears. Being able to run is not the same as being fine.
Myth: "Add some two-stroke oil and drive it home." It is an outdated workaround for a separate problem. It doesn't put back what petrol has thinned, and the petrol is still inside the tank later.
"Drain it yourself and you are sorted" — a myth, since after it's been running some petrol sits in the filter and lines, ready to go right back through the pump at the next start. It's also really hazardous to drain petrol into a can by the kerbside.
How it happens: petrol in a diesel
It is rarely carelessness, and nobody does it on purpose. The petrol nozzle is the slimmer of the two and slips 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 easy, and the error runs one way.
It occurs when routine and your car stop matching. Any car that is new to you — hired, on loan as a courtesy car, or brand new. Households running one of each, petrol and diesel. The pumps in a different order on a familiar forecourt. A train to catch, and a rushed fill en route to Sowerby Bridge. Precisely the moment it occurs: after years of driving petrol, someone fills a diesel Volkswagen Tiguan 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 Ripponden Wood: avoiding petrol in a diesel
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Read the pump's label; the colour is only a hint.
- The first fill in an unfamiliar vehicle is the time to check your filler flap — inside it, or on the cap, many motors state which fuel they take.
- Good intentions count for less than a sticker or a fob in a bright colour on the diesel's key when a home has one of each. So label it.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump. It seems daft and it does the trick.
- Whilst you are thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Some diesels have a filler built to block a petrol nozzle, and devices you can add exist for motors without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the pump.
- Less petrol makes a weaker mixture, and so stop the moment you notice — while remembering that your next stage is unchanged. It's still not to fire it up.
Petrol already in a diesel around Ripponden Wood? Start here
Short and simple, then, is the order of things. Leave it unstarted, with the ignition off too. The attendants at the forecourt — whether at Shell itself or wherever you filled up — will normally help roll it clear of the pump if you ask. Ring 0333 366 0103 next, with three facts — the fuel, the approximate volume, and if it's run.
Corrosion and deposits form the issue with AdBlue, where petrol brings lost protection. So if it was AdBlue, say so — and see its own Ripponden Wood page.
What makes one Ripponden Wood petrol in a diesel task cost more than the next
The four scenarios above are four different jobs, so no single price for this would be fair. Chiefly, the cost shifts with which situation you're in. Two things follow that: the petrol that went in as a proportion of what the tank takes, then the spot the car is in and whether a technician can reach it safely.
That's why our technicians ask three questions before pricing instead of after: what went in, how much, and if it's run. A range becomes a straight figure when the answers are in.
About Ripponden Wood
Ripponden Wood is a small village situated on the riverside in West Yorkshire, with a mix of terraced housing and a population of around 599 residents. Ripponden Wood sits at an elevation of 136 metres, close to the nearby villages of Soyland Town and Ripponden. Ripponden Wood is located near the town of Kebroyd and is approximately 10.6 miles from Bradford, making it a commuter base for the city. Ripponden Wood remains a quiet residential community with a strong sense of local identity.
Across West Yorkshire and around Ripponden Wood: fuel drain cover
Ripponden Wood waits in the HX postcode area, and the vans that answer petrol in diesel call-outs there work the places near it as well — Soyland Town, Ripponden and Kebroyd among them. The car does not need to come to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
At the pump in Ripponden Wood, still?
The best spot there is, then — that's where you are. Ring, and keep it switched off.