Should You Worry? Petrol in a Diesel Car in Scartho
Far less than you probably are, if it hasn't been started. Everyone around Scartho begins with "have I ruined it?", and the fair answer is generally no: petrol resting in the tank of any diesel remains harmless until priming, cranking or driving pulls it into your fuel system. Keep it that way: leave your motor off and call Petrol in Diesel. The rest of this page sets out what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you again.
What petrol in a diesel does to the engine
Diesel has two tasks on its way through an engine. It protects first, and only then does it burn. Your high-pressure pump and the injectors are made to very fine tolerances, and your diesel passing through them is what stops those surfaces from wearing against each other.
Badly at the first, not at all at the second: that's petrol. The clattering comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips out the lubrication your system depends on, and any pump running on such a blend is wearing itself.
Together, those leave the shape of the problem clear. Not contact but movement is what causes the harm. Where that petrol is only in that tank, it is a problem of fuel, nothing more. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with the fuel to your injectors further on.
Petrol in a diesel around Scartho: how bad is it? Four cases
Filled up, and never started: no case is better. The petrol is inside that tank and only that tank, and the job is a drain and a flush where your car stands. This is the one scenario that can only really happen on a forecourt, because anywhere else your car has been driven to get there.
The ignition switched on, or a short start. Once primed, the fuel system has pulled petrol out of the tank as far as your filter and the fuel lines. That's normally still an easy task — a drain, a flush, and your filter dealt with.
Driven a couple of miles. Now the pump has spent those miles running on weakened fuel. How hard the vehicle was driven matters as much as how far, and this work takes in the tank, your lines, the fuel filter and fresh fuel through the whole circuit. On the school run to Fairfield Academy, the miles is short. Any miles on the M180, under 15 miles from Scartho, means the motor working hard throughout, and a run to Kingston upon Hull, under 25 miles away, makes a very different task as well.
Driven on until it protested — rattling, smoke, a ragged idle, a soft throttle. What you are hearing is the motor signalling fuel that no longer acts like diesel. Pull up on the spot — on the verge on Mendip Avenue, at the kerb, down a side road — and do not move it. The fuel drain and flush still come first, and they sort it out: if a vehicle is stopped early, long-term damage is very uncommon.
What Scartho people get told about petrol in a diesel — and the stories in it
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. Nothing comes out when you top up — your tank just holds more of the same blend. That guidance assumes a diesel fuel system tolerates petrol by percentage. It does not.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through more precise parts: that is how a newer diesel handles its fuel, so the lubrication matters for more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there is no damage done." Feed diesel to a petrol motor and it usually will not run, and so the motorist stops — and the harm stops with them. Feed petrol to a diesel and it usually starts, ticks over and drives away like nothing happened — all while its pump is wearing. A running engine doesn't mean fine.
Myth: "Add some two-stroke oil and drive the car home." It is an outdated fix for a distinct issue. It does not put back what petrol has weakened, and the petrol is still in your tank later.
Once the engine has been run, part of the petrol is in the filter and your lines, not that tank — and your next start sends it straight back through your pump. So the myth "drain the tank yourself and you are sorted" does not stand up. Besides, petrol emptied into a can by the road is genuinely risky.
How it happens: petrol in a diesel
It is rarely carelessness, and nobody does it on purpose. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol motor at all. The forecourt makes it easy, and the mistake runs one way.
Habit and your car falling out of step is when it takes place. A car that's new to you — a hire car, on loan as a courtesy car, or brand new. Households running one of each, petrol and diesel. Your normal forecourt, its pumps suddenly in a different order. Racing for a train outside Grimsby Town and fuelling up en route. The first fill-up in a diesel Renault Megane after years of driving petrol is exactly the moment it occurs. Throw in rain, a phone call or a back seat full of kids, and your hand does what it has always done.
Scartho motorists: how to prevent petrol in a diesel next time
- Green for unleaded and black for diesel is normal in the UK — yet not on every forecourt. Go by the label on the pump, not the colour.
- Check your filler flap. Many cars state the fuel type inside the flap or on the cap. Look at it on your first fill in any car you do not know.
- A coloured fob or a sticker on your diesel's key does more than any amount of intending to remember, in a household with one of each.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It seems daft and it works.
- Thinking about something else is when this becomes an easy mistake to make, and so put your phone away and keep your mind on the petrol pump.
- Add-on devices are available for cars without one, and some diesels come with a filler that won't accept a petrol nozzle. Useful — but a safety net only, never a reason to stop checking the label.
- Less petrol makes a weaker mixture, so stop as soon as you notice — though remembering that the next stage is unchanged. It is still not to fire it up.
Scartho: already put petrol in a diesel?
Then the order of things is brief. Never start the vehicle, and do not turn your ignition on. If you are still at the forecourt — JET or anywhere else — ask the attendants to help you roll the car away from the pump. What got in, about how much, and whether it has run: tell us those when you ring 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a different fault — Scartho has a page just for it.
One petrol in a diesel task around Scartho costs more than another. Why?
The four scenarios above are four different jobs, so no single price for this would be honest. Which of them you are in is mostly what moves your cost. Where your car is counts too, and whether a technician can safely get to it, after the proportion of petrol to what the tank holds.
Three queries come first, before quoting, instead of after — what got in, how much, has it run — and that is the reason. Those replies turn a range into a straight figure.
About Scartho, briefly
Scartho is a suburban area in northern Lincolnshire, situated near the coast and approximately 18 metres above sea level. Scartho lies within commuting distance of Kingston upon Hull, which is about 17 miles away, and is close to nearby places such as Nunsthorpe, Bradley, and Grange. Scartho has a population of around 5197 people and predominantly consists of semi-detached housing.
Scartho and Lincolnshire: where our fuel drain cover reaches
Scartho sits in the DN postcode area, and our teams that answer petrol in diesel calls there work the places around it as well — Nunsthorpe, Bradley and Grange among them. No need to bring your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations we drain.
Scartho: still at the pump?
Then you are in the best position there is. Keep it off. Phone.