Should You Worry? Petrol in a Diesel Car in Broad Green
Provided it hasn't been started, worry far less than you likely are. "Have I wrecked it?" is the first question anyone in Broad Green asks, and the honest answer is normally no, because petrol resting in a diesel tank harms nothing till it's dragged through the fuel system — by ignition priming, by the starter, or by being driven. Petrol in Diesel is who to ring, with your motor left off, and so it stays that way. Read on 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 repeat it.
Petrol in a diesel: what does it do to the engine?
On its way through an engine, diesel has two jobs. Before it combusts, it protects — then it ignites. Very fine gaps go into your injectors and the high-pressure fuel pump, and just the diesel flowing through stops those surfaces grinding together.
Petrol does the first task badly and the second not at all. A pump running on a petrol mixture is wearing itself out, because petrol is runnier than diesel and takes away the lubrication the fuel system depends on. Petrol is also made to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that is where any knocking comes.
Put these together and the shape of the issue is plain. The harm is done by circulation, not by contact. Petrol in the tank is a fuel issue. After your pump has been running on that petrol, a mechanical issue has begun: whatever is shed by a pump that's wearing travels downstream to the fuel injectors with the fuel.
Four scenarios our technicians see in Broad Green: how bad is petrol in a diesel?
Fuelled, and never started: nothing beats it. At a forecourt, and really only there, the petrol is still limited to the tank — since anywhere else your car was driven to reach it. The task is draining and cleaning on the spot.
Ignition on, or started for a moment. With the system primed, the lines and filter already hold petrol that has come from the tank. Still normally easy: drain, flush, and the fuel filter dealt with.
The pump has spent a couple of miles on diluted fuel — that's what driving the vehicle meant. The work is your tank, your lines, the filter and clean fuel through the whole circuit, and how hard the vehicle was driven matters as much as how far. Driving the children to Chestnut Park Primary School is one kind of trip. Very different a second time: a trip to Westminster, under 10 miles away, or any miles on the M23, under 10 miles from Broad Green, where the motor kept labouring hard.
Driven on until it complained — knocking, smoke, an uneven idle, a soft throttle. That is the engine telling you its fuel no longer is acting like diesel. Pull up wherever you are — the verge on Cavendish Road, a lay-by, a side street — then leave it there. A car pulled over soon very rarely has lasting damage, as the fuel drain and the flush, which still go first, sort it out.
Myths Broad Green drivers hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. A bigger tank of the same mix is all it gives, since topping up removes nothing. A diesel fuel system doesn't accept petrol by percentage in the way that guidance supposes.
If anything, the opposite holds. Myth: "A current diesel can cope with a bit of petrol." Smaller components and higher pressure are the way a newer diesel runs its fuel, and that makes the protection count more, not less.
One myth that catches motorists out: if it starts and drives, it must be unharmed. Diesel in a petrol motor usually leaves a motor that won't run: the motorist stops, and so does the harm. Feed petrol to a diesel and it generally fires up, ticks over and pulls away as if nothing has happened — all while its pump is wearing. Being able to run is not the same as being fine.
An outdated workaround for a distinct problem lies behind this one. Myth: "Add some two-stroke oil and drive the car home." What petrol has diluted remains weakened, and the petrol remains inside that tank regardless.
The next start draws petrol back round the pump from the lines and the fuel filter, where some of it ends up once the motor has run. That is why a DIY tank drain does not sort it — a myth. It is also really hazardous to drain petrol into a can by the roadside.
Petrol in a diesel: how does it occur?
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle generally won't go into a petrol vehicle, but the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error easy, and just in that direction.
It happens when routine and the car stop matching. A new motor, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. A well-known forecourt with the pumps in a different order. A hurried fill on the way to West Croydon with a train to catch. Years of petrol cars behind you, a diesel Volkswagen Passat in front of you on the forecourt for its first tank — that is when. Your hand does what it has always done when you add rain, a phone call or a back seat full of children.
How to avoid petrol in a diesel on your next fill-up around Broad Green
- A green handle for unleaded and black for diesel is usual in the UK — yet not on every forecourt. Trust the label on the petrol pump, not the colour.
- Inspect the filler flap. Many cars state the fuel inside the flap or on the cap. Look at it on your first fill in any car you don't know.
- One of each in the home? Label the key to the diesel — a coloured fob, a sticker — because intending to remember isn't enough.
- "Diesel", out loud, before you lift the nozzle — every time a new or hired car gets its first tank. It seems daft. It does the trick.
- Mistakes like this are simple to make while your mind is on something else, and so the phone goes away.
- Some diesels have a filler built 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 pump.
- As soon as you realise, stop: less petrol in the tank makes a weaker mix. What to do next doesn't change, though — still do not fire it up.
Petrol already in a diesel in Broad Green? Begin here
The order of things is short, then. Do not start it, and do not switch the ignition on. Still at the forecourt, at BP or anywhere else? Ask the staff to help you push it clear of the pump. Then call 0333 366 0103 and tell us what went in, roughly how much, and if it has run.
If it was AdBlue and not petrol, say so. That is a separate fault — corrosion and deposits rather than lost lubrication — and it has its own page for Broad Green.
One petrol in a diesel job in Broad Green costs more than another. Why?
The four scenarios above are four separate jobs, so no single price for this would be honest. What moves your cost is mostly which of them you are in. Two things come after that: the petrol that got in as a share of what your tank takes, then the place 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 went in, its volume, and if it's run. That is why. Those replies are what turn a range into one firm number.
About Broad Green and its setting
Broad Green is a suburban area in south London, situated approximately 8.7 miles from central London and 8.3 miles from Westminster. Broad Green has a relatively low elevation of around 45 metres and is characterised by a high proportion of flat dwellings. Broad Green is close to several local amenities, including Wandle Park, and is near the towns of Croydon and Waddon. Broad Green has a population of around 19,787 people.
Broad Green and Greater London: where our fuel drain cover runs
Wandle Park, Croydon and Waddon are among the places near Broad Green that the same vans work, answering petrol in diesel jobs across Broad Green's CR postcode area. You need not bring the car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots we drain.
Broad Green: still at the pump?
No position is better: that is where you now are. Phone, and leave it turned off.