Stubbin: Petrol in a Diesel Car? How Worried to Be
Not started? Then less worried than you likely feel. "Have I wrecked it?" is the first thing everyone in Stubbin asks, and the honest answer is generally no, because petrol resting in a diesel tank harms nothing until it's dragged through the system — by ignition priming, by your starter, or by driving. To keep the car like that, ring Petrol in Diesel then leave the engine alone. Further down, you will find what petrol actually does inside a diesel, how far it may have got, and how to stop it happening to you again.
The motor and petrol in a diesel: what goes on
Diesel has two tasks on its way through an engine. Lubricating comes before burning; it does both. What stops the surfaces inside your high-pressure pump and the injectors from grinding against each other is your diesel flowing through them — they're designed to very fine tolerances.
Of those two jobs, petrol handles the first badly and the second not at all. It's runnier than diesel and takes away the protection the system depends on, and so a pump running on a petrol blend is a pump wearing itself. And petrol is made to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That is where the clattering comes from.
The shape of the problem is plain once you put those together. Contact doesn't do the harm — circulation does. Petrol in the tank is a fuel problem. Whatever a worn pump sheds travels on, borne by the fuel, into your injectors further along, which is why a pump that has worked on the petrol is where a mechanical issue starts.
Petrol in a diesel in Stubbin: how serious is it? Four situations
Fuelled but never started — as good as it gets. That petrol is inside that tank and just your tank, and the task is a drain and a flush where the vehicle sits. This is the one scenario that can only truly happen on a forecourt, because anywhere else the car has been driven to get there.
The ignition turned on, or a brief start. Petrol has left the tank and reached the filter and the lines, because the system has been primed. That's generally still a simple job — a drain, a flush, and the filter dealt with.
Those few miles on the road were the pump running on fuel diluted by petrol throughout. Distance is only half of that; how hard it was driven matters equally. Either way the work includes your tank, the fuel lines, the filter and fresh fuel through the whole system. Short trips, like the school run to Royd Nursery and Infant School, are one thing. Getting as far as Sheffield, under 10 miles away, makes a very different job — as does any distance on the M1, under 5 miles from Stubbin, with the engine labouring hard the whole time.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. What you are hearing is your motor reporting fuel that no longer runs like diesel. Whether it is the verge on Bocking Hill, a lay-by or a side road, stop where you are then leave it. The drain and flush-through still come first, and they take care of it: when a vehicle is pulled over quickly, lasting damage is very unusual.
Stubbin motorists and that petrol in a diesel myths they hear
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Topping up takes out nothing; it gives you a fuller tank of the same mix. A diesel fuel system does not accept petrol by percentage in the way that guidance presumes.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. More precise components and higher pressure are how a current diesel runs its fuel, and that makes the lubrication matter more, not less.
"It starts, it drives, so there is no harm" — the myth that catches most people than any other. A petrol motor fed diesel normally will not run, so the driver stops and the harm stops with them. While the pump grinds, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Fine and running are not the same thing.
Not so: a two-stroke additive makes it safe to drive home. It is an old workaround, supposed for another problem. None of what petrol thinned gets put back by it — and afterwards, that tank still contains the petrol.
Myth: "Drain that tank yourself and you are sorted." Once the engine has been run, some of the petrol is no longer in the tank: it's in the filter and the lines, and it goes right back through your pump on the next start. Clearing petrol into a can by the roadside is also genuinely dangerous.
How it happens: petrol in a diesel
A careless moment is rarely the cause, and nobody means to do it. One way only, because of the nozzles: the slimmer petrol one slides inside a diesel filler with almost no resistance, while the diesel one generally won't fit a petrol vehicle. That is how the forecourt makes it simple.
The moment habit stops matching the vehicle is the moment it takes place. A new car, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. The pumps in a different order on a well-known forecourt. Racing for a train outside Penistone and fuelling up en route. Precisely the moment it occurs: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Add rain, a phone call or a back seat full of children, and your hand repeats what it has always done.
How to avoid petrol in a diesel on your next fill-up around Stubbin
- Check the pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on each forecourt. The label is what counts.
- Plenty of cars state the fuel inside the filler flap or on the cap, so check there on your first fill in a vehicle you do not know.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of meaning to remember, for a home with one of each.
- Before the nozzle leaves the pump the first time you fuel a hired or new vehicle, say "diesel" out loud. Daft, perhaps, yet it works.
- Thinking about something else is when this becomes an easy mistake to make, so tuck the phone away then keep your mind on the petrol pump.
- Some diesels come with a filler built to refuse 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.
- As soon as you notice, stop: less petrol in your tank makes a weaker blend. What to do next does not change, though — still do not start the vehicle.
Put petrol in a diesel in Stubbin already?
Short and simple, then, is the order of things. Don't switch the ignition on, and do not crank it. The attendants on the forecourt — whether at Murco itself or wherever you filled up — will normally help roll it away from the pump if you ask. What was put in, roughly how much, and if it's run: tell us that when you phone 0333 366 0103.
Corrosion and deposits form the issue with AdBlue, where petrol means lost protection. So if it was AdBlue, say so — and read its own Stubbin page.
What makes one Stubbin petrol in a diesel job cost more than the next
Four different jobs sit behind the four scenarios above — which is why there is no fair single price. Mostly, the cost moves with which situation you are in. The ratio matters next, meaning how much of your tank is petrol, and then the location of your car and whether getting to it is safe for a van.
Before any quote, not after, come three queries: your fuel that got in, its volume, and whether it has run. That's why. A range becomes a straight figure once those replies are in.
About Stubbin, for a moment
Stubbin is a suburban area situated on the riverside in South Yorkshire, with a mix of semi-detached housing and a population of around 4496 residents. Stubbin sits at an elevation of 211 metres, overlooking the surrounding landscape and located near other local places such as Knoll Top and Wood Willows. Stubbin is close to the city of Sheffield, being approximately 8.2 miles away, and is part of the wider Sheffield urban area. Stubbin benefits from its proximity to local amenities and transport links, being 149.4 miles from London.
Across South Yorkshire and in Stubbin: fuel drain cover
Stubbin waits in the S postcode area, and the teams that answer petrol in diesel calls there work the places near it as well — Knoll Top, Wood Willows and Bracken Moor among them. The car does not need to move to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
At the petrol pump in Stubbin, still?
In that case, you could not be in a better place. Switched off it stays; then ring.