Petrol in a Diesel Car in Brighton and Hove: How Worried Should You Be?
Likely less than you are now — as long as nobody has started it. Till the ignition primes the pump, the starter turns, or the vehicle is driven, petrol in a diesel tank just sits there and does no harm. Which makes the truthful reply to that first Brighton and Hove query — "have I wrecked it?" — normally no. Keep it that way: leave the engine off then call Petrol in Diesel. Read on for three things: the effect petrol has inside a diesel motor, the signs of how far it has spread, and the way to make sure you don't do it again.
Inside the engine: what petrol in a diesel really does
On its way through a motor, diesel does two tasks. Before it burns, it lubricates — then it ignites. Very fine tolerances go into the injectors and your high-pressure pump, and just the diesel running through stops those surfaces grinding together.
Of those two jobs, petrol handles the first badly and the second never. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump running on the blend to wear itself. It's also made to resist igniting under compression — the opposite of what a diesel needs — which is where you hear the knocking.
Seen together, they make clear what shape the trouble takes. It is movement that does the harm, not contact. Where that petrol is only inside the tank, it is an issue of fuel, nothing more. Once your pump has been labouring on that petrol, a mechanical issue has started: whatever is shed by a pump that's wearing travels onward to the injectors with the fuel.
Brighton and Hove, petrol in a diesel: four cases, from mild to major
The best case there is: filled up, never started. That petrol is inside the tank and just your tank, and the task is a drain and a flush where the vehicle stands. This is the one situation that can only truly happen at a forecourt, since anywhere else the vehicle has been driven to get there.
Your ignition switched on, or a brief start. With the fuel system primed, your lines and filter already hold petrol that has come from the tank. That's usually still a straightforward task — a drain, a flush, and the filter seen to.
Some miles driven, and the pump has spent each of them labouring on weakened fuel. Miles is only half of it; how hard it was driven counts equally. Either way the work runs to your tank, the lines, the filter and fresh fuel through the whole system. Short trips, like the school run to St Paul's CofE Primary School, are one thing. Very different a second time: a run to Chichester, under 50 miles away, or any distance on the M23, under 25 miles from Brighton and Hove, where the engine never stopped running hard.
Driven on until it protested — rattling, smoke, a lumpy idle, a dead throttle. What you are hearing is the engine reporting fuel that no longer behaves like diesel. Whether it's the verge on North Street, a lay-by or a side road, stop there then leave it. The drain and flush still go first, and they sort it out: when a vehicle is pulled over soon, lasting damage is very uncommon.
Brighton and Hove people and that petrol in a diesel stories they 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 holds more of the same mixture. That guidance assumes a diesel fuel system tolerates petrol by percentage. It does not.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." Smaller components and higher pressure are the way a modern diesel runs its fuel, and that makes the protection count more, not less.
The myth that catches drivers out: if it starts and drives, it must be unharmed. Diesel in a petrol motor generally means a motor that will not run: the motorist stops, and so does the damage. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile your pump grinds. Running isn't the same as fine.
Not so: a two-stroke additive lets you to drive home. It was an old fix, supposed for another fault. What petrol has thinned remains thinned, and that petrol remains inside that tank anyway.
The next start draws petrol back round the pump out of the fuel lines and your filter, where some of that sits after your engine has run. That's why draining your tank yourself does not sort it — a myth. Clearing petrol into a can by the kerbside is also truly dangerous.
How it happens: petrol in a diesel
No one does it on purpose, and it's rarely carelessness. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol motor at all. The forecourt makes it simple, and the error runs one way.
The moment routine stops matching your car is the moment it occurs. Courtesy car, hire car, or a motor that is brand new. One petrol and one diesel on the drive of the same household. The pumps in a different order on a familiar forecourt. A hurried fill en route to Brighton with a train to catch. The first fill-up in a diesel Renault Clio after years of driving petrol is exactly the moment it occurs. Add a back seat full of children, a phone call or rain, and habit takes over.
How to avoid petrol in a diesel at your next fill-up in Brighton and Hove
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most usually do. Check the pump's label; the colour is only a clue.
- Check your filler flap. Plenty of cars state the fuel type inside the flap or on the cap. Look at it on the first fill in any motor you do not know.
- Good intentions do less than a sticker or a fob in a bright colour on your diesel's key if a house has one of each. So mark it.
- Before the nozzle comes off the pump the first time you fuel a hired or new motor, say "diesel" aloud. Silly, yes, but it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, and so put the phone away and keep your mind on the pump.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to refuse a petrol nozzle, and add-on devices are available for cars without one. They are a safety net, not a reason to stop checking the pump.
- The moment you notice, stop: less petrol in the tank makes a thinner mixture. What to do next does not change, though — still do not fire it up.
Already put petrol in a diesel around Brighton and Hove?
Then the order of things is short. Leave it unstarted, with your ignition off as well. The attendants on the forecourt — whether at BP itself or wherever you filled up — will normally help roll it away from the pump if you ask. Then ring 0333 366 0103 and tell us what went in, about how much, and whether it has run.
Corrosion and deposits form the issue with AdBlue, where petrol means lost lubrication. So if it was AdBlue, say so — and read its own Brighton and Hove page.
One petrol in a diesel job around Brighton and Hove costs more than another. Why?
There's no fair single price for this, since the four scenarios above are four separate tasks. What moves the cost is mostly which of them you're in. The share counts next, meaning how much of that tank is petrol, and then the location of your car and whether getting to it is safe for our van.
That is why our engineers ask three questions before pricing rather than after: what got in, how much, and if it's run. Given those replies, you get a straight figure rather than a range.
About Brighton and Hove itself
Brighton and Hove is a coastal city in East Sussex, situated on the English Channel coast at an average elevation of 31 metres. Brighton and Hove lies approximately 47 miles south of London and is a major urban centre in the South East region. Brighton and Hove is characterised by its predominantly flat housing stock, with many residential areas featuring apartment blocks and flats. Brighton and Hove is also close to other nearby places, including the city's own districts of Brighton and Round Hill, as well as the neighbouring area of Preston.
Fuel drain cover across East Sussex, Brighton and Hove included
Brighton and Hove sits in the BN postcode area, and our vans that answer petrol in diesel call-outs there work the spots around it as well — Brighton, Round Hill and Preston among them. The vehicle does not need to come to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Brighton and Hove: still at the petrol pump?
The best place there is, then — that is where you are. Call, and keep it turned off.