How Worried Should You Be? Petrol in a Diesel Car in Aigburth
Likely less than you are now — provided no one has started the vehicle. Everyone around Aigburth begins with "have I wrecked it?", and the honest answer is usually no: petrol resting in the tank of any diesel remains harmless until priming, cranking or driving draws it into your fuel system. To keep the vehicle like that, call Petrol in Diesel and leave your engine alone. The rest of this page covers what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you again.
Petrol in a diesel: what does it do to the motor?
Passing through an engine, diesel is doing two things at the same time. It lubricates first, and only then does it burn. What stops the surfaces inside the high-pressure pump and your injectors from grinding against one another is your diesel flowing through them — they're made to very fine gaps.
Of those two jobs, petrol handles the first badly and the second never. A pump working on a petrol blend is wearing itself out, since petrol is runnier than diesel and takes away the lubrication the fuel system relies on. Petrol is also made to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that is where any knocking comes.
Put these together and the shape of the trouble is clear. The damage is done by circulation, not by contact. Where the petrol is only in your tank, it's an issue of fuel, nothing more. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with the fuel to the fuel injectors downstream.
Aigburth, petrol in a diesel: four cases, from mild to major
Filled but never started — as good as it gets. That petrol is inside that tank and only the tank, and the job is a drain and a flush where your car stands. This is the one scenario that can only really occur at a forecourt, since anywhere else the car has been driven to get there.
Started for a moment, or just the ignition on. With the fuel system primed, the lines and filter now contain petrol that came from your tank. Still generally straightforward: drain, flush, and your filter sorted.
Your pump now worked a couple of miles on weakened fuel — that is what driving the car meant. How hard the vehicle was driven matters as much as how far, and this work takes in that tank, your lines, your filter and fresh fuel through the entire system. The school run to St Austin's Catholic Primary School is one thing. Very different a second time: a trip to Liverpool, under 5 miles away, or any mileage on the M62, under 3 miles from Aigburth, where the motor kept labouring hard.
Rattling, an uneven idle, smoke, a throttle gone soft: driven until it complained. The engine is telling you your fuel is no longer acting like diesel. Whether it is the verge on Oakland Road, a lay-by or a side street, stop where you are then leave it. What comes first is still the fuel drain and flush-through, and that deals with it, with long-term damage very rare when a car is stopped quickly.
Aigburth people and the petrol in a diesel myths they hear
Myth: topping up to full with diesel makes it fine. It doesn't. A bigger tank of the same mix is all you get, since topping up takes out nothing. A diesel fuel system doesn't accept petrol by percentage in the way that guidance presumes.
Not so: a newer diesel copes with a bit of petrol. If anything, the opposite. At higher pressure, through finer components: that's how a newer diesel moves its fuel, so the protection counts more, not less.
This is the one that catches people. Myth: "If it starts and drives, there's no harm done." Any petrol engine fed diesel usually won't run, so the motorist stops and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile your pump wears. Being able to run is not proof of being fine.
An old workaround for a different fault is behind this one. Myth: "Add some two-stroke oil and drive the car home." What petrol has weakened stays weakened, and that petrol stays in that tank regardless.
Myth: "Drain your tank yourself and you're sorted." After the motor has run, some of that petrol is no longer in your tank: it's in your filter and the fuel lines, and it goes right back through the pump at your next start. Also, a can of petrol drained at the kerbside is genuinely dangerous.
How petrol ends up: petrol in a diesel
A careless moment is seldom the cause, and nobody means to do it. The petrol nozzle is the smaller of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol motor at all. The forecourt makes it easy, and the error runs one way.
Habit and the vehicle falling out of step is when it happens. Hire cars, courtesy cars, and vehicles that are new to you. One petrol and one diesel on the drive of the same household. The pumps in a different order on a familiar forecourt. Rushing for a train at the nearest station and filling up en route. A new-to-you diesel Renault Megane, its first fuelling, and a driver used to petrol: exactly when it happens. Throw in rain, a phone call or a back seat full of kids, and the hand repeats what it has always done.
Next time you fill up around Aigburth: avoiding petrol in a diesel
- Green for unleaded and black for diesel is usual in the UK — but not on every forecourt. Trust the label on the pump, not the colour.
- Check your filler flap. Plenty of vehicles state the fuel inside the flap or on the cap. Look at it on the first fill in any vehicle you don't know.
- One of each in the house? Label your key to the diesel — a bright fob, a sticker — because meaning to remember is not enough.
- It sounds silly and it works: on your first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump.
- Whilst you are thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Add-on devices are available for vehicles without one, and some diesels come with a filler that won't accept a petrol nozzle. Useful — but a backstop at best, never a reason to stop checking the label.
- Less petrol means a weaker mixture, and so stop the moment you realise — though remembering that your next step is unchanged. It's still not to fire it up.
Already put petrol in a diesel around Aigburth?
The order of things is short, then. Starting it is out, and so is switching on your ignition. Yet on the forecourt, at BP or anywhere else? Ask the staff to help you push the vehicle away from the pump. Ring 0333 366 0103 next, with three facts — the fuel, the rough volume, and if it has run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a different problem — Aigburth has a page all for it.
Aigburth petrol in a diesel jobs: why one costs more than another
There's no honest single price for this, since the four situations above are four different tasks. Which of them you are in is mostly what moves your cost. Next it is the ratio — how much petrol was put in against how much the tank takes — and then where the vehicle is and whether a van can reach it safely.
Before any quote, not after, come three questions: the fuel that went in, the amount, and if it's run. That's why. Their replies are what turn a range into one firm number.
About Aigburth itself
Aigburth is a suburban area in Merseyside, situated on the coast near Liverpool, with a mix of semi-detached housing and local parks. Aigburth lies close to the River Mersey, at an elevation of around 28 metres, and is bordered by nearby places such as Grassendale and Cressington Park. Aigburth has a population of approximately 8214 people and is located about 3.9 miles from Liverpool city centre. Aigburth is also near several other local areas, including Grassendale Park.
Fuel drain cover around Aigburth and across Merseyside
Our teams answering petrol in diesel calls around Aigburth, in the L postcode area, equally work the places around it, Grassendale, Cressington Park and Grassendale Park among them. A forecourt, a supermarket car park, a lay-by or your own drive are all locations our engineers work, and the vehicle doesn't need to move to us.
Aigburth: still at the pump?
The best place there is, then — that's where you are. Keep it off. Phone.