How Worried Should You Be? Petrol in a Diesel Car in Sidley
Provided it hasn't been started, you can worry far less than you probably are. Till your ignition primes your pump, your starter cranks, or your vehicle is driven, petrol in a diesel tank simply sits there and does nothing. Which makes the truthful reply to that first Sidley question — "have I wrecked it?" — normally no. Keep it like that: leave the engine off and phone Petrol in Diesel. The rest of this page explains what petrol really does to a diesel, how to tell how far it has got, and how to make sure it doesn't happen to you again.
Inside the engine: what petrol in a diesel does
Diesel does two jobs on its way through a motor. It lubricates first, and only then does it burn. Your high-pressure pump and the fuel injectors are designed to extremely fine clearances, and the diesel passing through them is what stops those surfaces from wearing down against each other.
Petrol does the first task badly and the second not at all. The knocking comes from petrol being designed not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection the system hinges on, and any pump running on that mix is wearing itself.
Seen together, they show the shape the issue takes. Contact doesn't do the harm — circulation does. Where that petrol is only in that tank, it's an issue of fuel, nothing more. Once your pump has been working on that petrol, a mechanical problem has begun: anything shed by a pump that's grinding travels downstream to the injectors with the fuel.
Petrol in a diesel in Sidley: how bad is it? Four situations
Fuelled but not once started — the best it gets. The petrol is in your tank and only that tank, and the job is a drain and a flush where the vehicle stands. This is the one situation that can only really occur on a forecourt, as anywhere else the car has been driven to get there.
Ignition on, or started for a moment. Your system has been bled, and so petrol has left your tank and reached the filter and the lines. That is normally still a simple task — a drain, a flush, and the filter dealt with.
A couple of miles driven, and the pump has spent each of them working on diluted fuel. Tank, lines, filter, then fresh fuel put through the whole circuit: that is the work, and the way your car was driven counts as much as the mileage. On the school run to All Saints Church of England Primary School, Bexhill, the miles is small. Driving as far as Brighton and Hove, under 50 miles away, makes a very different job — as does any miles on the M20, under 50 miles from Sidley, with the motor working hard all the way.
Driven till it protested. Knocking, a ragged idle, smoke, a throttle that has gone soft. That's the engine telling you its fuel no longer is behaving like diesel. Leave it wherever it has stopped: a lay-by, a side street, the verge on All Saints Lane. Permanent damage is very unusual when a vehicle is pulled over quickly, and the drain and flush that still come first take care of it.
Petrol in a diesel myths Sidley drivers hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing is removed when you top up — your tank just carries more of the same mixture. Percentage isn't how a diesel fuel system copes with petrol, however much that guidance assumes.
Myth: a current diesel copes with a bit of petrol. Rather, the opposite. A newer diesel sends its fuel through finer components at higher pressure, which makes the lubrication matter more, not less.
This is the one that catches drivers. Myth: "If it starts and drives, there's no harm done." Feed diesel to a petrol motor and it usually won't run, and so the motorist stops — and the damage stops with them. A diesel fed petrol generally starts, idles and drives away as though nothing has happened, whilst the pump wears. Fine and running are not the same at all.
Myth: a two-stroke additive makes it safe to drive home. It is an old fix, supposed for another problem. What petrol has diluted stays weakened, and the petrol stays inside that tank anyway.
If the engine has run, part of the petrol sits in the filter and the fuel lines, not that tank — and the next start sends it straight back through your pump. So the myth "drain your tank yourself and you are sorted" doesn't hold. On top of that, petrol emptied into a can by the road is truly hazardous.
Petrol in a diesel: how does it take place?
On purpose? Never. Through carelessness? Seldom, if ever. A diesel nozzle generally won't fit a petrol vehicle, yet the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake easy, and only in that direction.
The moment routine stops matching the vehicle is the moment it takes place. A car 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. A well-known forecourt with the pumps in a different order. Fuelling up in a hurry en route to Bexhill, with a train to catch. The first fill-up in a diesel Volkswagen Passat after years of driving petrol is exactly the moment it takes place. Add a back seat full of kids, a phone call or rain, and habit wins.
Sidley drivers: how to avoid petrol in a diesel next time
- A green handle for unleaded and black for diesel is usual in the UK — yet not on every forecourt. Go by the label on the pump, not the colour.
- The first fill in an unfamiliar vehicle is the time to check the filler flap — on it, or on the cap, many vehicles state which fuel to use.
- One of each in the household? Mark the key to the diesel — a coloured fob, a sticker — since intending to remember is not enough.
- Before the nozzle comes off the petrol pump the first time you fuel a hired or new car, say "diesel" aloud. Daft, yes, but it does the trick.
- Tuck the phone away. This is an easy mistake to make whilst you are thinking about something else.
- Add-on devices exist for cars without one, and some diesels are built with a filler that will not take a petrol nozzle. Useful — but a backstop only, never a reason to stop checking the label.
- Stop as soon as you realise. Less petrol in your tank means a thinner mixture. It doesn't change what to do next, which is still not to crank it.
Petrol already in a diesel around Sidley? Begin here
Then the order of things is short. Leave it unstarted, with your ignition off as well. If you are still at the forecourt — Pace or anywhere else — ask the staff to help you roll it away from the petrol pump. Then ring 0333 366 0103 and tell us what was put in, about how much, and whether it's run.
If it was AdBlue instead of petrol, say so. That is a different issue — corrosion and deposits instead of lost protection — and it has its own page for Sidley.
What makes one Sidley petrol in a diesel task cost more than the next
A fair single price doesn't exist here: four scenarios, four separate tasks. Mostly, the cost shifts with which one you are in. Beyond that it's the proportion — how much petrol was put in against how much your tank takes — and then where the car is and whether a technician can reach it safely.
That is why we ask three queries before quoting instead of after: what went in, how much, and if it has run. Given those replies, there is a straight figure rather than a range.
About Sidley, for a moment
Sidley is a suburban area in East Sussex, situated near the coast and approximately 35 metres above sea level. Sidley lies within the larger conurbation of Bexhill, close to Glenleigh Park and Old Town, and is characterized by its predominantly semi-detached housing stock. Sidley is also relatively close to the major city of Brighton and Hove, which is 26.8 miles away, and is about 51.9 miles from London.
Across East Sussex and around Sidley: fuel drain cover
Petrol in diesel jobs in Sidley — part of the TN postcode area — go to teams that likewise cover the locations round it, Glenleigh Park, Bexhill and Old Town included. Our technicians drain where your vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
In Sidley and still at the petrol pump?
Nothing beats it: that is where you now are. Ring, and keep it turned off.