How Worried Should You Be? Petrol in a Diesel Car in Cuilfail
Less than you likely are, provided it hasn't been started. Everyone in Cuilfail starts with "have I ruined it?", and the honest answer is generally no: petrol resting inside that tank of a diesel remains harmless till priming, cranking or driving draws it into the system. To keep the vehicle like that, ring Petrol in Diesel then leave your motor switched off. Keep reading for three things: the effect petrol has inside a diesel motor, the signs of how far it has got, and ways to make sure you don't do it again.
What petrol in a diesel does to your engine
Diesel does two tasks on its way through a motor. It ignites, and before it burns it protects. What keeps the surfaces inside the high-pressure pump and the injectors from grinding against each other is the diesel passing through them — they are built to very fine tolerances.
Of those two tasks, petrol manages the first poorly and the second never. Being less viscous than diesel, petrol strips away the protection a fuel system needs, so a pump running on that mixture wearing itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is why you hear the knocking.
Taken together, they make clear what shape the problem has. It is movement that does the harm, not contact. Where the petrol is only inside your tank, it is a problem of fuel, nothing more. A pump that has been working on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with the fuel to your injectors further on.
Petrol in a diesel around Cuilfail: how bad is it? Four cases
The best case there can be: filled up, not once started. On a forecourt, and genuinely only there, the petrol is still confined to the tank — since anywhere else your car was driven to get to it. The job is draining and purging on the spot.
Started for a second, or just your ignition on. Petrol has left that tank and got to the filter and your lines, since your system has been primed. Drain, flush, deal with your filter: still usually simple.
A few miles driven, and the pump has spent every one of them labouring on diluted fuel. How hard the car was driven counts as much as how far, and the work takes in that tank, the lines, the filter and fresh fuel through the entire system. Short trips, such as the school run to South Malling CofE Primary and Nursery School, are one matter. Very different again: a run to Brighton and Hove, under 10 miles away, or any miles on the M23, under 25 miles from Cuilfail, where your engine never stopped labouring hard.
Driven on till it protested — clattering, smoke, a ragged idle, a soft throttle. The engine is telling you the fuel is no longer acting like diesel. Whether it's the verge on Cuilfail Tunnel, a lay-by or a side road, stop there then leave it. What goes first is still the drain and flush, and that deals with it, with permanent damage very uncommon if a vehicle is pulled over early.
What Cuilfail motorists get told about petrol in a diesel — and the myths in it
False: topping up to full with diesel makes it fine. It does not. Topping up takes out nothing; it gives you a fuller tank of the same mixture. A diesel fuel system doesn't tolerate petrol by percentage in the way that guidance presumes.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." A current diesel sends its fuel through smaller components at higher pressure, which makes the lubrication count more, not less.
This is the one that fools motorists. Myth: "If it starts and drives, there's no harm done." Diesel in a petrol motor usually leaves a motor that won't run: the driver stops, and so does the damage. A diesel fed petrol usually starts, idles and drives away as though nothing has happened, whilst your pump wears. Being able to run is not proof of being fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a separate fault. None of what petrol diluted is put back by it — and afterwards, the tank still contains the petrol.
The next start sends petrol back round your pump out of the fuel lines and the fuel filter, where some of that sits after the motor has been run. That is why draining your tank yourself doesn't leave you sorted — a myth. Besides, petrol drained into a can by the road is truly hazardous.
Why petrol in a diesel occurs so easily
Carelessness is rarely the cause, and no one means to do it. One way only, because of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol car. That is how the forecourt makes it straightforward.
Habit and the vehicle falling out of step is how it occurs. Hire cars, courtesy cars, and motors that are new to you. Households running one of each, petrol and diesel. A forecourt you know, only with its pumps laid out differently. Fuelling up in a hurry on the way to Lewes, with a train to catch. The first fill-up in a diesel Volkswagen Passat after years of driving petrol is exactly the moment it occurs. With rain, a call arriving, or children to deal with, the hand just does what it always has.
Preventing petrol in a diesel next time you fill up in Cuilfail
- Green for unleaded and black for diesel is usual in the UK — yet not on every forecourt. Go by the label on the petrol pump, not the colour.
- Plenty of motors state the fuel type inside your filler flap or on the cap, so check it on the first fill in any motor you don't know.
- Good intentions count for less than a sticker or a fob in a vivid colour on the diesel's key when a home has one of each. So label it.
- Before the nozzle leaves the petrol pump the first time you fill a hired or new motor, say "diesel" out loud. Silly, yes, yet it does the trick.
- Tuck your phone away. This is an easy mistake to make whilst you are thinking about something else.
- Some diesels come with a filler designed to reject a petrol nozzle, and devices you can add are available for vehicles without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the petrol pump.
- Stop the moment you realise. Less petrol inside the tank makes a thinner mix. It doesn't change what to do next, which is still not to start the car.
Already put petrol in a diesel in Cuilfail?
Then the order of things is brief. Don't switch the ignition on, and don't start it. Yet on the forecourt, at BP or anywhere else? Ask the staff to help you roll the car away from the petrol pump. Then phone 0333 366 0103 and tell us what got in, about how much, and whether it's run.
Corrosion and deposits are the problem with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and see its own Cuilfail page.
One petrol in a diesel job around Cuilfail costs more than another. Why?
There is no honest single price for this, since the four scenarios above are four separate tasks. Which of them you are in is chiefly what moves your cost. Two things follow that: the petrol that got in as a proportion of what that tank holds, then the spot the vehicle is in and whether a van can get to it safely.
Ahead of any quote, not after, we ask three queries: your fuel that got in, its amount, and if it's run. That's why. With those answers, there is a straight figure rather than a range.
About Cuilfail, for a moment
Cuilfail is a suburban area situated on the riverside in East Sussex, with an elevation of around 40 metres. Cuilfail lies approximately 8 miles west of Brighton and Hove and 44 miles south of London, near the communities of Cliffe and Lewes. Cuilfail is characterized by its predominantly flat housing stock, which reflects its development as a residential area. Cuilfail has a population of around 2686 people, according to recent estimates.
Fuel drain cover in Cuilfail and across East Sussex
Cuilfail waits in the BN postcode area, and the teams that answer petrol in diesel call-outs there work the locations around it as well — Cliffe, Lewes and South Malling among them. Our technicians drain wherever your car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the pump around Cuilfail?
No position is better: that's where you now are. Leave the car turned off, and ring.