How Worried Should You Be? Petrol in a Diesel Car in Woodhouse
Unstarted? Then less worried than you probably feel. Petrol resting in a diesel tank does nothing to the engine until something pulls it through the fuel system — the ignition priming your pump, the starter, or driving on its own. So the honest answer to the first question anyone around Woodhouse asks, "have I wrecked it?", is normally no. Leave the motor off and ring Petrol in Diesel — that is how you keep it that way. Further down, this page sets out what petrol actually does inside a diesel, how far it might have got, and how to stop it happening to you again.
Inside the motor: what petrol in a diesel really does
Passing through a motor, diesel does two jobs at once. It ignites, and before it burns it lubricates. The high-pressure fuel pump and the injectors are made to extremely fine tolerances, and the diesel passing through them is what keeps those surfaces from wearing against each other.
Petrol handles the first task badly and the second not at all. A pump working on a petrol blend is wearing itself out, because petrol is runnier than diesel and takes away the lubrication the fuel system depends on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that is where the clattering starts.
The shape of the trouble is clear when you put those together. It's circulation that does the harm, not contact. A tank with petrol in it is a fuel problem. Once your pump has been labouring on that petrol, a mechanical problem has started: whatever is shed by a pump that is wearing travels downstream to the fuel injectors with your fuel.
Petrol in a diesel around Woodhouse: how serious is it? Four cases
Fuelled up, not once started. The best case there is. The petrol is in the tank and only that tank, and the task is a drain and a flush where the car stands. This is the one scenario that can only truly occur at a forecourt, as anywhere else the car has been driven to get there.
A brief spell of running, or merely your ignition on. The fuel system has been primed, and so petrol has left that tank and got to the fuel filter and the fuel lines. Normally little more than emptying, purging and seeing to your filter, so still simple.
The pump now worked a few miles on diluted fuel — that is what driving it meant. How hard the vehicle was driven matters as much as how far, and the work takes in that tank, the fuel lines, the filter and fresh fuel through the whole system. On the school run to Haggonfields Primary and Nursery School, the distance is short. Driving as far as Sheffield, under 15 miles away, makes a very different task — as does any mileage on the M1, under 10 miles from Woodhouse, with the engine running hard the whole time.
Driven till it complained. Clattering, an uneven idle, smoke, a throttle that has gone soft. What you are hearing is the engine signalling fuel that no longer acts like diesel. Pull up wherever you are — the verge on Woodhouse Close, a lay-by, a side street — then leave it there. The fuel drain and flush still come first, and they sort it out: if a vehicle is pulled over quickly, permanent damage is very unusual.
What Woodhouse motorists get told about petrol in a diesel — and the myths in it
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing comes out when you top up — the tank just carries more of the same mixture. Percentage is not how a diesel fuel system copes with petrol, however much that advice supposes.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. A modern diesel sends its fuel through finer parts at higher pressure, which makes the lubrication matter more, not less.
The myth that catches motorists off guard: if it starts and drives, it must be unharmed. The driver of a petrol engine fed diesel normally has no choice but to stop, because it will not run, and the harm stops there. Feed petrol to a diesel and it generally fires up, idles and drives away like nothing happened — all while its pump is wearing. Fine and running aren't the same thing.
Myth: "Add some two-stroke oil and drive the car home." It's an outdated fix for a separate fault. What petrol has diluted stays weakened, and that petrol remains in the tank regardless.
"Drain it yourself and you're sorted" — a myth, since after it's been running some petrol lies in the filter and lines, waiting to go right back through the pump on your next start. It's also truly hazardous to drain petrol into a can by the kerbside.
How it happens: petrol in a diesel
On purpose? Never. Through carelessness? Seldom, if ever. The petrol nozzle is the smaller of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol car at all. The forecourt makes it simple, and the mistake runs one way.
The moment routine stops matching the vehicle is the moment it happens. Any motor that's new to you — hired, on loan as a courtesy car, or just bought. One petrol and one diesel on the driveway of the same household. The pumps in a different order on a familiar forecourt. A rushed fill en route to Shireoaks with a train to catch. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you at the forecourt for its first tank — that's when. The hand repeats what it has always done once you add rain, a phone call or a back seat full of children.
How to prevent petrol in a diesel on your next fill-up in Woodhouse
- A green handle for unleaded and black for diesel is normal in the UK — but not on every forecourt. Go by the label on the petrol pump, not the colour.
- The first fill in an unfamiliar car is the time to check the filler flap — inside it, or on the cap, plenty of cars state the fuel they take.
- Label 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 — each time a new or hired car needs its first tank. It sounds daft. It works.
- Mistakes like this are straightforward to make while your mind is on something else, and so the phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to refuse a petrol nozzle, and add-on devices exist for motors without one. They are a safety net, not a reason to stop checking the pump.
- Less petrol means a thinner mix, so stop the moment you notice — though remembering that your next stage is unchanged. It is still not to start the car.
Woodhouse: already put petrol in a diesel?
Then the order of things is brief. Leave it unstarted, with your ignition off as well. Ask the attendants to help you push it clear of the petrol pump if you are still on the forecourt, whether that's Asda or somewhere else. Next, 0333 366 0103. We'll ask what went in, about how much, and if it has been run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate fault — Woodhouse has a page all for it.
Woodhouse petrol in a diesel jobs: why one costs more than another
There's no fair single quote for this, because the four scenarios above are four separate jobs. What shifts the cost is chiefly which of them you are in. Where your car is counts too, and whether a van can safely reach it, after the proportion of petrol to what that tank holds.
Ahead of any quote, not after, come three questions: your fuel that got in, its amount, and if it has run. That is why. A range becomes a straight figure when those replies are in.
About Woodhouse, for a moment
Woodhouse is a small hamlet in Nottinghamshire, situated on the riverside at an elevation of 46 metres, with semi-detached housing being the predominant type of accommodation. Woodhouse lies near several other local places, including Rhodesia, Gateford Common, and Shireoaks, and is approximately 13.9 miles from the city of Sheffield. Woodhouse is also within commuting distance of larger cities, being around 132.2 miles from London. Woodhouse has a population of around 809 residents.
Fuel drain cover around Woodhouse and across Nottinghamshire
Petrol in diesel jobs around Woodhouse — part of the S postcode area — go to vans that likewise cover the places about it, Rhodesia, Gateford Common and Shireoaks included. You need not bring your car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all locations where we work.
In Woodhouse and still at the pump?
Then you are in the best position there can be. Call, and leave it switched off.