Should You Worry? Petrol in a Diesel Car in Southbourne
Unstarted? Then less anxious than you likely are. "Have I ruined it?" is the first question everyone around Southbourne asks, and the honest answer is usually no, because petrol left in a diesel tank harms nothing till it is drawn through the fuel system — by ignition priming, by your starter, or by being driven. Keep it that way: leave the engine off and call Petrol in Diesel. What petrol really does to a diesel, how to gauge how far it's gone, and how to keep it from happening again: that's the rest of this page.
Your engine and petrol in a diesel: what goes on
Passing through an engine, diesel is doing two things at the same time. It protects to begin with, and after that does it burn. Extremely fine clearances are built into the injectors and the high-pressure pump, and only the diesel running through keeps their surfaces from grinding together.
Petrol does the first task badly and the second not at all. Being less viscous than diesel, petrol strips away the protection a fuel system needs, leaving a pump on the mixture wearing itself. It is also made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the clattering.
Taken together, they show what shape the problem has. Contact doesn't do the harm — movement does. Any tank with petrol in it is a fuel fault. After your pump has been working on that petrol, a mechanical issue has started: whatever is shed by a pump that is grinding is carried downstream to the injectors with your fuel.
How serious is petrol in a diesel? Four situations our engineers see around Southbourne
Fuelled, and never started: no case is better. At a forecourt, and truly only there, the petrol is still confined to the tank — because everywhere else the car was driven to reach it. The job is draining and flushing on the spot.
Your ignition turned on, or a brief start. Once primed, your system has drawn petrol from your tank up to the fuel filter and the lines. Still usually simple: drain, flush, and the fuel filter sorted.
Those few miles on the road meant your pump labouring on fuel thinned by petrol the whole way. Distance is only half of it; how hard it was driven counts equally. Either way this work runs to your tank, the fuel lines, the filter and fresh fuel through the whole system. Driving the children to St Katharine's Church of England Primary School is one sort of trip. Driving as far as Southampton, under 25 miles away, makes a very different task — as does any miles on the M27, under 25 miles from Southbourne, with your engine working hard all the way.
Driven till it protested. Clattering, a lumpy idle, smoke, a throttle that has gone soft. What you are hearing is the engine reporting fuel that no longer runs like diesel. Stop wherever you are — the verge on Foxholes Road, a lay-by, a side street — then leave the vehicle where it is. Lasting damage is very uncommon if a car is stopped early, and the fuel drain and flush-through that still go first take care of it.
Southbourne people and the petrol in a diesel myths they hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up removes nothing; it gives you a bigger tank of the same mix. Percentage isn't how a diesel fuel system copes with petrol, whatever that advice assumes.
If anything, the opposite holds. Myth: "A modern diesel can cope with a bit of petrol." A modern diesel runs its fuel through finer components at higher pressure, which makes the lubrication count more, not less.
This is the one that fools motorists. Myth: "If it starts and drives, there is no harm done." Diesel in a petrol motor usually leaves a motor that won't run: the driver stops, and so does the harm. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile your pump grinds. Running doesn't mean fine.
Myth: "Add some two-stroke oil and drive the car home." It is an old fix for a separate issue. None of what petrol thinned gets put back by it — and later, the tank still holds that petrol.
"Drain it yourself and you're sorted" — a myth, since after it's been running some petrol lies in the fuel filter and lines, waiting to go right back through the pump on the next start. On top of that, petrol cleared into a can by the road is genuinely risky.
Petrol in a diesel: how does it happen?
On purpose? Never. Through carelessness? Rarely, if ever. 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 vehicle at all. The forecourt makes it easy, and the error runs one way.
It occurs when routine and the vehicle stop matching. Courtesy car, hire car, or a motor that's new. Two motors on one drive, one petrol, one diesel. A familiar forecourt with the pumps in a different order. Racing for a train at Christchurch and fuelling up en route. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist accustomed to petrol: exactly when it happens. Add rain, a phone call or a back seat full of children, and your hand repeats what it has always done.
Preventing petrol in a diesel next time you fill up around Southbourne
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most generally do. Check the petrol pump's label; the colour is just a clue.
- Plenty of motors state the fuel type inside your filler flap or on the cap, so check there on your first fill in a car you do not know.
- Label the key. In a household with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- "Diesel", out loud, before you pick up the nozzle — each time a new or hired car gets its first tank. It seems silly. It does the trick.
- Put the phone away. This is an easy mistake to make whilst you're thinking about something else.
- Add-on devices are available for cars without one, and some diesels come with a filler that will not take a petrol nozzle. Useful — but a backstop only, never a reason to stop checking the label.
- As soon as you notice, stop: less petrol inside your tank means a thinner mixture. What to do next does not change, though — still don't fire it up.
Already put petrol in a diesel around Southbourne?
Then the order of things is brief. Leave it unstarted, with the ignition off too. The attendants at the forecourt — whether at Esso itself or wherever you filled up — will normally help roll it clear of the petrol pump if you ask. Call 0333 366 0103 next, with three facts — your fuel, the approximate amount, and if it has run.
Say so if it was AdBlue instead of petrol: it's a separate fault, with its own page for Southbourne, because AdBlue brings corrosion and deposits rather than lost lubrication.
Why one petrol in a diesel task in Southbourne costs more than another
Four different tasks lie behind the four scenarios above — which is why there's no honest single quote. What moves your cost is mostly which of them you are in. Two things follow that: the petrol that went in as a share of what the tank holds, then the place the vehicle is in and whether a technician can reach it safely.
Before any quote, not after, we ask three queries: your fuel that was put in, the volume, and if it's run. That is why. Given the replies, there is a straight figure instead of a range.
About Southbourne, briefly
Southbourne is a coastal suburban area in Dorset, situated near the towns of Christchurch and Bournemouth. Southbourne sits on the shores of Christchurch Bay, with its residential areas generally at an elevation of around 29 metres. Southbourne is characterized by its predominantly detached housing stock and is close to nearby places such as Tuckton, Wick, and Hengistbury Head. Southbourne has a population of approximately 6401 residents.
Across Dorset and around Southbourne: fuel drain cover
Our teams answering petrol in diesel call-outs around Southbourne, in the BH postcode area, equally work the spots near it, Tuckton, Wick and Hengistbury Head among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots we drain, and the car doesn't need to come to us.
In Southbourne and still at the petrol pump?
Then you are in the best spot there is. Turned off it remains; then call.