Petrol in a Diesel Car in Sutton: How Worried Should You Be?
Far less than you likely are, if it has not been started. Till the ignition primes the pump, your starter cranks, or the car is driven, petrol in a diesel tank simply rests there and does nothing. Which means the truthful reply to the first Sutton question — "have I ruined it?" — normally no. Keep it like that: leave the motor off and ring Petrol in Diesel. Keep reading for three things: the effect petrol has inside a diesel motor, the signs of how far it has spread, and ways to make sure you never do it again.
Inside your engine: what petrol in a diesel does
On its way through a motor, diesel has two tasks. It burns, and before it ignites it lubricates. Designed to very fine clearances, your injectors and the pump depend on your diesel flowing through them to stop their surfaces wearing against one another.
The second job petrol doesn't do at all, and the first it does badly. Being less viscous than diesel, petrol strips out the protection a fuel system needs, leaving a pump running on the blend wearing itself. It's equally made to resist igniting under compression — the reverse of what a diesel needs — which is why you get the clattering.
Put those together and the shape of the issue is plain. The damage is done by movement, not by contact. Where that petrol is only inside your tank, it's an issue of fuel, nothing more. Once the pump has been working on that petrol, a mechanical problem has started: anything shed by a pump that's wearing is carried downstream to the injectors with your fuel.
Sutton, petrol in a diesel: four situations, from mild to significant
Fuelled up, not once started. The best case there is. Just the tank has petrol in it, so the job is emptying your tank and purging the system where your car stands. This scenario can only truly occur on a forecourt: anywhere else, the car got there by being driven.
A moment's running, or just the ignition on. Petrol has come out of your tank and reached the filter and the lines, because the fuel system has been primed. Normally little more than clearing, cleaning and seeing to your filter, and so still easy.
Your pump has spent a few miles on diluted fuel — that's what driving the car does. How hard the car was driven matters as much as how far, and the work covers the tank, the lines, your filter and clean fuel through the whole system. On the school run to Robin Hood Junior School, the miles is small. Driving as far as Westminster, under 10 miles away, makes a very different job — as does any distance on the M23, under 10 miles from Sutton, with your engine running hard all the way.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone ragged. That's your engine telling you its fuel has stopped behaving like diesel. Whether it's the verge on High Street, a lay-by or a side road, stop where you are then leave it. Permanent damage is very unusual when a vehicle is pulled over soon, and the fuel drain and flush-through that still come first take care of it.
Myths Sutton drivers hear about petrol in a diesel
False: topping up to full with diesel makes it fine. It does not. Nothing is removed by topping up — you are left with a bigger tank, still the same mix. A diesel fuel system doesn't tolerate petrol by percentage in the way that guidance presumes.
Not so: a current diesel copes with a bit of petrol. If anything, the opposite. At higher pressure, through smaller components: that's how a modern diesel moves its fuel, and so the lubrication matters for more, not less.
"It starts, it drives, and so there is no harm" — the myth that trips up most motorists than any other. Feed diesel to a petrol motor and it usually won't run, and so the motorist stops — and the damage stops with them. A diesel fed petrol usually starts, ticks over and drives away as though nothing has happened, while the pump wears. Running is not the same as fine.
Myth: "Add some two-stroke oil and drive the car home." It is an outdated fix for a distinct issue. The petrol is still in your tank after that, and what it has weakened isn't put back.
If the engine has run, part of that petrol sits in the filter and the lines, not that tank — and the next start sends it right back through your pump. So the myth "drain your tank yourself and you are sorted" doesn't stand up. Also, a can of petrol filled by the roadside is genuinely risky.
How does petrol in a diesel take place?
On purpose? Never. Through carelessness? Rarely, if ever. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle generally won't go into a petrol car at all. So the error runs one way.
Habit and the car getting out of step is when it happens. Courtesy car, hire car, or a vehicle that is brand new. Two cars on one driveway, one petrol, one diesel. Your ordinary forecourt, its pumps suddenly in a different order. A train to catch, and a hurried fill en route to Sutton (London). A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: exactly when it takes place. With rain, a call arriving, or children to deal with, the hand just does what it has always done.
Next time you fill up around Sutton: preventing petrol in a diesel
- Green for unleaded and black for diesel is usual in the UK — yet not on each forecourt. Go by the label on the pump, not the colour.
- Inspect your filler flap. Plenty of vehicles state the fuel inside the flap or on the cap. Look at it on the first fill in a car you don't know.
- One of each in the household? Label the key to the diesel — a coloured fob, a sticker — because intending to remember isn't enough.
- Before the nozzle leaves the pump the first time you fuel a hired or new car, say "diesel" aloud. Daft, perhaps, but it works.
- While you are thinking about something else, this is an easy mistake to make — so put the phone away.
- Some diesels come with a filler designed to refuse a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the pump.
- The moment you notice, stop: less petrol inside that tank means a weaker mix. What to do next doesn't change, though — still do not start the car.
Sutton: already put petrol in a diesel?
Then the order of things is brief. Don't start the car, and don't turn your ignition on. Yet on the forecourt, at Shell or anywhere else? Ask the attendants to help you roll the car clear of the petrol pump. Then ring 0333 366 0103 and tell us what went in, about how much, and if it has run.
Corrosion and deposits form the trouble with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and read its own Sutton page.
Why one petrol in a diesel job around Sutton costs more than another
Four separate tasks lie behind the four situations above — which is why there is no fair single price. Which of them you're in is chiefly what shifts the cost. The proportion matters next, meaning how much of that tank is petrol, and then the location of the vehicle and whether getting to it is safe for a van.
That's why our engineers ask three queries before quoting rather than after: what went in, how much, and whether it has run. Those replies are what change a range into one firm number.
About Sutton and its setting
Sutton is a locality in the southern part of Greater London, situated approximately 10 miles from central London. Sutton sits at an elevation of around 53 metres, in a generally flat area of the London Basin. Sutton is surrounded by other suburban areas, including Benhilton, Cheam, and Carshalton Beeches, and is characterized by a high proportion of flat dwellings.
Sutton and Greater London: where our fuel drain cover runs
Petrol in diesel jobs around Sutton — part of the SM postcode area — go to teams that likewise cover the locations around it, Benhilton, Cheam and Carshalton Beeches among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots we work, and the vehicle doesn't need to come to us.
In Sutton and still at the petrol pump?
Then, you couldn't be in a better spot. Leave the car switched off, and ring.