Should You Worry? Petrol in a Diesel Car in Uffington
Not started? Then less worried than you probably are. Until the ignition primes your pump, your starter cranks, or your car is driven, petrol in a diesel tank simply sits there and does nothing. Which makes the truthful reply to that first Uffington question — "have I wrecked it?" — normally no. Petrol in Diesel is who to ring, with your motor kept off, so it remains that way. Read on for three things: the effect petrol has inside a diesel motor, the clues of how far it has got, and ways to make sure you never repeat it.
Your engine and petrol in a diesel: what happens
Two jobs fall to diesel on its route through a motor. Oiling comes before burning; it does both. The high-pressure pump and the injectors are designed to very fine tolerances, and your diesel passing through them is what keeps those surfaces from wearing down against one another.
Badly at the first, not at all at the second: that is petrol. It is runnier than diesel and strips away the protection your fuel system hinges on, and so a pump running on a petrol blend is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the clattering comes from.
Taken together, they make clear the shape the problem takes. The damage is done by circulation, not by contact. Any tank with petrol in it is a fuel fault. Once your pump has been running on that petrol, a mechanical problem has started: anything shed by a pump that's wearing down is carried downstream to your injectors with your fuel.
Four situations our technicians see around Uffington: how serious is petrol in a diesel?
Filled up, and not started: nothing beats it. Only that tank has petrol in it, so the task is clearing the tank and purging the system where your car sits. This scenario can only really take place at a forecourt: anywhere else, your car got there by being driven.
Started for a moment, or just the ignition on. Your system has been primed, so petrol has left the tank and got to the fuel filter and the lines. That is usually still a straightforward task — a drain, a flush, and the fuel filter seen to.
Those few miles driven meant your pump labouring on fuel diluted by petrol the whole way. Tank, lines, filter, then clean fuel put through the entire circuit: that's this work, and the way your car was driven matters as much as the miles. The school run to The Uffington Church of England Primary School is one matter. Any distance on the Great North Road, under 10 miles from Uffington, means the engine has worked hard throughout, and a run to Peterborough, under 10 miles away, is a very different job too.
Driven on till it protested — knocking, smoke, a lumpy idle, a soft throttle. The fuel is not acting like diesel any more, and the motor is telling you. Leave it where it has stopped: a lay-by, a quiet street, the verge on Somes Close. Lasting damage is very rare if a car is pulled over quickly, and the fuel drain and flush-through that still come first sort it out.
Uffington drivers 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 is not how a diesel fuel system copes with petrol, whatever that guidance assumes.
"Newer diesels can handle a little petrol" — a myth, and closer to the opposite. Lubrication matters more on newer diesels, not less, since their fuel passes through finer parts at higher pressure.
Myth: "If it starts and drives, there is no harm done." This is the one that fools people. Diesel in a petrol motor normally leaves a motor that will not run: the driver stops, and so does the damage. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump grinds. Being able to run is not the same as being fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate problem. What petrol has weakened stays weakened, and the petrol remains inside that tank anyway.
The next start draws petrol back round the pump from the lines and your filter, where some of it ends up once your engine has been run. That is why draining your tank yourself doesn't sort it — a myth. Also, a can of petrol filled by the roadside is truly risky.
How does petrol in a diesel take place?
It is seldom carelessness, and no one does it on purpose. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol vehicle at all. The forecourt makes it easy, and the mistake runs one way.
When habit and the vehicle stop matching, it takes place. Courtesy car, hire car, or a motor that is new. Two motors on one drive, one petrol, one diesel. The pumps in a different order on a familiar forecourt. Rushing for a train outside Stamford and fuelling up en route. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it takes place. With rain, a call arriving, or children to deal with, the hand just does what it has always done.
How to avoid petrol in a diesel at your next fill-up in Uffington
- Green for unleaded and black for diesel is usual in the UK — but not on every forecourt. Trust the label on the petrol pump, not the colour.
- Inspect your filler flap. Plenty of cars state the fuel inside the flap or on the cap. Look at it on the first fill in a vehicle you do not know.
- Mark 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 meaning to remember.
- "Diesel", aloud, before you lift the nozzle — every time a new or hired car gets its first tank. It seems silly. It does the trick.
- While you are thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to block a petrol nozzle, and aftermarket devices exist for the rest. Count it as a backstop, and keep reading the pump.
- Less petrol means a thinner mix, so stop as soon as you realise — while remembering that your next stage is unchanged. It is still not to start the vehicle.
Already put petrol in a diesel around Uffington?
In that case, there's only a short order of things. Leave it unstarted, with your ignition switched off as well. Ask the attendants to help you roll it away from the pump if you're still on the forecourt, whether that is Gulf or somewhere else. Then ring 0333 366 0103 and tell us what got in, about how much, and if it has run.
If it was AdBlue instead of petrol, say so. That's a separate problem — corrosion and deposits and not lost protection — and it has its own page for Uffington.
One petrol in a diesel job in Uffington costs more than another. Why?
Four separate jobs lie behind the four scenarios above — which is why there's no honest single price. What shifts the cost is chiefly which of them you're in. The share matters next, meaning how much of that tank is petrol, and then the location of the car and whether getting to it is safe for a van.
Before any quote, not after, come three queries: the fuel that was put in, the amount, and if it's run. That is why. Given those answers, there is a straight figure rather than a range.
About Uffington
Uffington is a small village in Lincolnshire, situated in the East Midlands region of England, with a population of around 504 people. Uffington sits at an elevation of 34 metres, approximately 9.9 miles from Peterborough, and is characterised by its predominantly detached housing. Uffington is located near other villages such as Newstead, Pilsgate, and Northfields, and is about 80.6 miles from London.
Uffington and Lincolnshire: where our fuel drain cover runs
Uffington sits in the PE postcode area, and our vans that answer petrol in diesel jobs there work the locations around it as well — Newstead, Pilsgate and Northfields among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations our engineers work, and your car does not need to come to us.
Uffington: still at the petrol pump?
No position is better: that's where you are. Call, and keep it turned off.