How Worried Should You Be? Petrol in a Diesel Car in Felin Newydd
Far less than you probably are, if it hasn't been started. Petrol resting in a diesel tank does nothing to the engine until something pulls it through your fuel system — the ignition priming your pump, the starter, or driving on its own. So the fair answer to the first query anyone in Felin Newydd asks, "have I ruined it?", is usually no. To keep the vehicle that way, call Petrol in Diesel and leave the engine switched off. The remainder 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 does not happen to you again.
Petrol in a diesel: what does it do to your engine?
Passing through an engine, diesel is doing two jobs at the same time. Lubricating comes before burning; it does both. Designed to extremely fine gaps, the fuel injectors and the pump rely on the diesel flowing through them to stop their surfaces wearing against one another.
Petrol does the first job badly and the second not at all. Being less viscous than diesel, petrol strips away the protection a fuel system needs, so a pump on that mixture wearing itself. It's also made to resist igniting under compression — the opposite of what a diesel needs — which is why you hear the knocking.
The shape of the problem is clear once you put those together. Not contact but movement is what does the damage. All a tank with petrol in it amounts to is a fuel fault. The start of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with your fuel to the fuel injectors beyond it.
Felin Newydd, petrol in a diesel: four situations, from mild to significant
The best case there is: filled up, not once started. The petrol is in that tank and just your tank, and the job is a drain and a flush where the car stands. This is the one situation that can only really happen on a forecourt, because anywhere else your car has been driven to get there.
The ignition turned on, or a brief start. Petrol has left your tank and reached the filter and your lines, because the system has been bled. Usually little more than clearing, purging and seeing to the filter, so still straightforward.
A few miles driven, and the pump has spent each of them running on weakened fuel. Miles is only half of it; how hard it was driven counts equally. Either way the work includes your tank, your lines, your filter and clean fuel through the whole circuit. Driving the children to the local primary school is one sort of trip. Any miles on the M4, under a mile from Felin Newydd, means the motor has worked hard throughout, and a run to Swansea, under 5 miles away, makes a very different task too.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. The motor is telling you the fuel is no longer behaving like diesel. Whether it's the verge on Bran Close, a lay-by or a side road, stop where you are and leave it. The drain and flush-through still come first, and they sort it out: if a car is pulled over quickly, long-term damage is very uncommon.
Petrol in a diesel stories Felin Newydd people hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Nothing comes out when you top up — that tank simply carries more of the same mixture. The idea behind that guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. Smaller parts and higher pressure are how a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
"It starts, it drives, and so no harm done" — the myth that catches most people than any other. Diesel in a petrol motor normally leaves a motor that will not run: the motorist stops, and so does the harm. Feed petrol to a diesel and it usually fires up, idles and drives away as if nothing has happened — all the while its pump is wearing. Running doesn't mean fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a separate issue. None of what petrol weakened is put back by it — and afterwards, the tank still holds that petrol.
The next start sends petrol back round your pump from the fuel lines and your filter, where some of it sits after the engine has been run. That's why draining your tank yourself does not leave you sorted — a myth. Draining petrol into a can at the kerbside is also genuinely hazardous.
Petrol in a diesel: how does it take place?
Carelessness is seldom the cause, and no one means to do it. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol car at all. The forecourt makes it easy, and the mistake runs one way.
Routine and the vehicle getting out of step is how it happens. A motor that is new to you — a hire car, on loan as a courtesy car, or just bought. Two motors on one drive, one petrol, one diesel. Your normal forecourt, its pumps now in a different order. A hurried fill en route to Llansamlet with a train to catch. Years of petrol cars behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that is when. The hand does what it has always done when you add rain, a phone call or a back seat full of children.
Felin Newydd motorists: how to prevent petrol in a diesel next time
- Green for unleaded and black for diesel is usual in the UK — but not on each forecourt. Go by the label on the pump, not the colour.
- In a motor you do not know, look inside the flap over your filler or at the cap before the first fill: many vehicles state the fuel type there.
- Mark the key. In a household with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember.
- It seems daft and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump.
- Tuck the phone away. This is an easy mistake to make while you're thinking about something else.
- Some diesels have a filler designed to block 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 reading the pump.
- As soon as you realise, stop: less petrol inside that tank means a thinner mixture. What to do next does not change, though — still don't fire it up.
Felin Newydd: already put petrol in a diesel?
Then, there is just a short order of things. Don't crank it, and do not turn the ignition on. The staff at the forecourt — whether at BP itself or wherever you filled up — will normally help roll it away from the petrol pump if you ask. Ring 0333 366 0103 next, with three facts — the fuel, the rough quantity, and if it's run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a different problem — Felin Newydd has a page all for it.
One petrol in a diesel job in Felin Newydd costs more than another. Why?
The four scenarios above are four separate jobs, so no single quote for this would be fair. Which of them you're in is chiefly what shifts your cost. Beyond that it is the share — how much petrol was put in against how much your tank takes — and then where your car is and whether a technician can reach it safely.
Before any quote, not after, come three questions: your fuel that got in, the quantity, and whether it has run. That's why. Those answers are what turn a range into one firm number.
About Felin Newydd, briefly
Felin Newydd is a small suburban area situated near the coast in Swansea, with an elevation of around 13 metres above sea level. Felin Newydd is located approximately 3.2 miles from Swansea city centre and is close to nearby places such as Llansamlet and Cae-maes-y-bar. Felin Newydd has a mix of housing types, but is predominantly characterised by terraced homes. Felin Newydd is a relatively small community, with a population of around 583 people.
Fuel drain cover around Felin Newydd and across Swansea
Our vans answering petrol in diesel calls in Felin Newydd, in the SA postcode area, equally work the spots around it, Llansamlet, Cae-maes-y-bar and Pwllygrafel among them. A forecourt, a supermarket car park, a lay-by or your own drive are all places we work, and the vehicle doesn't need to move to us.
In Felin Newydd and still at the petrol pump?
No position is better: that is where you are. Ring, and keep it switched off.