How Worried Should You Be? Petrol in a Diesel Car in Enfield Highway
Far less than you likely are, provided it hasn't been started. "Have I wrecked it?" is the first thing everyone around Enfield Highway asks, and the truthful answer is normally no, because petrol resting in a diesel tank harms nothing until it's drawn through the system — by ignition priming, by the starter, or by being driven. Leave the engine off then ring Petrol in Diesel — that keeps it that way. What petrol actually does to a diesel, how to judge how far it's travelled, and how to keep it from happening a second time: that's the rest of this page.
The motor and petrol in a diesel: what happens
Passing through a motor, diesel does two jobs at the same time. Lubricating comes before burning; it does both. Your high-pressure pump and the injectors are built to very fine clearances, and your diesel passing through them is what stops those surfaces from grinding against one another.
Petrol does the first task badly and the second not at all. The rattling comes from petrol being made not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips away the protection your system rests on, and any pump working on such a mixture is wearing itself.
Put those together and the shape of the issue is plain. The harm is done by movement, not by contact. All a tank with petrol in it amounts to is a fuel fault. The beginning of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds moves on with the fuel to the injectors downstream.
Enfield Highway, petrol in a diesel: four situations, from mild to serious
The best case there can be: filled up, never started. Being at a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With that petrol kept in that tank alone, it is drained and purged right where it stands, and nothing more is needed.
The ignition turned on, or a brief start. Petrol has come out of that tank and reached your filter and your lines, since the system has been primed. Drain, flush, see to the fuel filter: still usually simple.
Driven a few miles. Now the pump has spent those miles running on diluted fuel. Tank, lines, filter, then clean fuel run through the whole system: that's this work, and the way your car was driven counts as much as the mileage. The school run to St James CofE Primary School is one matter. A run as far as London, under 15 miles away, is a very different task. So is any miles on the M25, under 3 miles from Enfield Highway, where the engine has been running hard throughout.
Driven on till it protested — rattling, smoke, a ragged idle, a dead throttle. The fuel isn't behaving like diesel any more, and your engine is telling you. Whether it is the verge on Carterhatch Lane, a lay-by or a side street, stop where you are then leave it. Lasting damage is very unusual if a car is stopped early, and the fuel drain and flush that still come first sort it out.
Petrol in a diesel stories Enfield Highway drivers hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing is removed by topping up — you are left with a fuller tank, still the same mixture. Percentage isn't how a diesel fuel system copes with petrol, however much that advice assumes.
"Current diesels can handle a little petrol" — a myth, and nearer the reverse. Protection counts more on modern diesels, not less, because their fuel passes through smaller parts at higher pressure.
This is the one that fools people. Myth: "If it starts and drives, there is no damage done." A petrol engine fed diesel usually will not run, so the driver stops and the harm stops with them. Feed petrol to a diesel and it generally starts, ticks over and drives away like nothing happened — all the while its pump is wearing. Fine and running are not the same thing.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct problem. None of what petrol diluted gets put back by it — and afterwards, that tank still holds the petrol.
"Drain it yourself and you're sorted" — a myth, because after it's been running some petrol lies in your filter and lines, waiting to go straight back through your pump on your next start. Clearing petrol into a can by the kerbside is also genuinely dangerous.
How does petrol in a diesel take place?
On purpose? Never. Through carelessness? Seldom, if ever. One way only, because of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, while the diesel one generally won't fit a petrol vehicle. That's how the forecourt makes it easy.
When routine and the car stop matching, it occurs. A new motor, a hire car or a courtesy car. One petrol and one diesel on the drive of the same household. The pumps in a different order on a familiar forecourt. Racing for a train outside Brimsdown and fuelling up en route. A new-to-you diesel Peugeot 308, its first fuelling, and a motorist used to petrol: precisely when it happens. Throw in rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
Next time you fill up around Enfield Highway: preventing petrol in a diesel
- Read the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on each forecourt. The label is what counts.
- The first fill in a new motor is the time to check the filler flap — inside it, or on the cap, many vehicles state the fuel they take.
- One of each in the house? Label your key to the diesel — a coloured fob, a sticker — since meaning to remember is not enough.
- It seems silly and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, and so put the phone away then keep your mind on the petrol pump.
- Some diesels have a filler designed to reject a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop checking the petrol pump.
- Stop the moment you notice. Less petrol inside your tank makes a thinner mixture. It does not change what to do next, which is still not to start the car.
Petrol already in a diesel around Enfield Highway? Begin here
The order of things is brief, then. Starting it is out, and so is switching on the ignition. Ask the staff to help you push it away from the petrol pump if you're still on the forecourt, whether that's Esso or somewhere else. Next, 0333 366 0103. We will ask what got in, roughly how much, and if it's been run.
If it was AdBlue and not petrol, say so. That's a different issue — corrosion and deposits and not lost protection — and it has its own page for Enfield Highway.
Enfield Highway petrol in a diesel jobs: why one costs more than another
A fair single quote doesn't exist here: four situations, four separate jobs. Mostly, the cost shifts with which situation you're in. Where the vehicle is matters too, and whether a van can safely reach it, after the ratio of petrol to what your tank takes.
What went in, how much, and whether it's run — three queries our engineers ask before quoting, not after, for precisely that reason. With the replies, there is a straight figure instead of a range.
About Enfield Highway and where it is
Enfield Highway is a suburban area in the London Borough of Enfield, located approximately 11 miles north of central London. Enfield Highway sits at a low elevation of around 20 metres, near the River Lea and close to neighbouring areas such as Enfield Wash and Brimsdown. Enfield Highway is characterized by its predominantly terraced housing stock, which reflects the typical residential architecture of the region. Enfield Highway is also situated near several local amenities and transport links, including those connecting it to London and other nearby suburbs like Southbury.
Across Greater London and in Enfield Highway: fuel drain cover
Our vans answering petrol in diesel calls in Enfield Highway, in the EN postcode area, equally work the locations near it, Enfield Wash, Southbury and Brimsdown among them. The car doesn't need to come to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
In Enfield Highway and still at the pump?
The best place there is, then — that is where you are. Keep it off. Phone.