How Worried Should You Be? Petrol in a Diesel Car in West Green
Far less than you probably are, provided it has not been started. Everyone around West Green starts with "have I ruined it?", and the fair answer is usually no: petrol left in that tank of any diesel stays harmless until priming, cranking or driving draws it into your fuel system. Petrol in Diesel is who to call, with your engine left off, and so it remains that way. Below, this page sets out what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you a second time.
Petrol in a diesel: what does it do to the engine?
Diesel does two jobs on its way through a motor. It protects to begin with, and after that does it burn. Designed to very fine clearances, the injectors and your pump depend on your diesel flowing through them to keep their surfaces from wearing against one another.
Of these two jobs, petrol manages the first badly and the second never. 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 lubrication your system depends on, and any pump working on that mixture is wearing itself.
Taken together, they make clear what shape the issue takes. Contact doesn't do the harm — circulation does. All a tank with petrol in it amounts to is a fuel issue. The start of a mechanical one is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with your fuel to the fuel injectors beyond it.
How bad is petrol in a diesel? Four scenarios our technicians see in West Green
Filled up, never started. The best case there can be. Only that tank has petrol in it, and so the task is draining your tank and cleaning the system where the vehicle sits. This scenario can only truly take place at a forecourt: anywhere else, the car got there by being driven.
Ignition on, or started for a moment. Petrol has come out of your tank and got to your filter and your lines, because the fuel system has been primed. That's normally still a simple job — a drain, a flush, and the fuel filter seen to.
Some miles driven, and your pump has spent every one of them running on weakened fuel. How hard your car was driven counts as much as how far, and the work takes in your tank, the lines, the filter and fresh fuel through the entire circuit. On the school run to Harris Primary Academy Philip Lane, the mileage is small. Very different once more: a trip to London, under 10 miles away, or any miles on the M11, under 10 miles from West Green, where your engine never stopped running hard.
Driven till it protested. Rattling, a lumpy idle, smoke, a throttle that has gone soft. The fuel isn't behaving like diesel any more, and the motor is telling you. Pull up wherever you are — the verge on La Rose Lane, a lay-by, a side street — then leave the car there. The fuel drain and flush-through still go first, and they take care of it: when a vehicle is stopped soon, long-term damage is very unusual.
West Green motorists and the petrol in a diesel myths they hear
Myth: topping up to full with diesel makes it fine. It doesn't. A bigger tank of the same mixture is all it gives, because topping up removes nothing. The idea behind the advice — that diesel fuel systems accept petrol by percentage — is wrong.
"Modern diesels can handle a little petrol" — a myth, and nearer the reverse. A newer diesel sends its fuel through more precise parts at higher pressure, which makes the protection matter more, not less.
"It starts, it drives, so no harm done" — the myth that trips up more motorists than any other. A petrol motor fed diesel usually won't run, and so the driver stops and the damage stops with them. Feed petrol to a diesel and it normally starts, idles and drives away as if nothing has happened — all the while its pump is wearing. A running engine does not mean fine.
Not so: a two-stroke additive lets you to drive home. It was an old workaround, meant for another problem. That petrol is still in your tank after that, and what it has weakened is not put back.
The next start draws petrol back round your pump out of the fuel lines and the filter, where some of that ends up once the motor has been run. That is why draining your tank yourself doesn't leave you sorted — a myth. And, a can of petrol filled by the kerbside is truly risky.
Petrol in a diesel: how does it take place?
Nobody does it on purpose, and it is rarely carelessness. The forecourt makes it simple: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle mostly will not go into a petrol car at all. So the mistake runs one way.
When routine and your car stop matching, it occurs. Courtesy car, hire car, or a car that's new. Households running one of each, petrol and diesel. Your usual forecourt, its pumps now in a different order. A train to catch, and a hurried fill en route to Seven Sisters. Exactly the moment it takes place: after years of driving petrol, someone fills a diesel Ford Focus for the first time. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
Avoiding petrol in a diesel next time you fill up in West Green
- The label is what counts, and so read the petrol pump rather than the colour: in the UK unleaded handles are usually green and diesel black, yet not on every forecourt.
- Inspect the filler flap. Plenty of motors state the fuel type inside the flap or on the cap. Look at it on your first fill in any car you do not know.
- Mark your key. In a home with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- Before the nozzle comes off the petrol pump the first time you fill a hired or new motor, say "diesel" out loud. Daft, yes, but it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, and so put your phone away and keep your mind on the petrol pump.
- Some diesels have a filler designed to block 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 checking the petrol pump.
- The moment you realise, stop: less petrol inside your tank means a thinner blend. What to do next doesn't change, though — still don't crank it.
West Green: already put petrol in a diesel?
The order of things is short, then. Do not turn the ignition on, and do not crank it. The staff on the forecourt — whether at Sainsbury's itself or wherever you filled up — will normally help roll it clear of the petrol pump if you ask. Phone 0333 366 0103 next, with three facts — the fuel, the rough quantity, and if it's run.
Say so if it was AdBlue rather than petrol: it is a separate fault, with its own page for West Green, because AdBlue brings corrosion and deposits instead of lost protection.
Why one petrol in a diesel task around West Green costs more than another
A fair single quote doesn't exist here: four situations, four separate jobs. What shifts the cost is chiefly which of them you are in. Two things follow that: the petrol that got in as a share of what your tank takes, then the place the vehicle is in and whether a technician can reach it safely.
Three questions come first, before quoting, rather than after — what went in, how much, has it run — and that is the reason. The answers turn a range into a straight figure.
About West Green
West Green is a suburban area in north London, situated near the River Lea and close to the neighbouring districts of Harringay and Tottenham Green. West Green sits at a relatively low elevation of 19 metres, with terraced housing being the predominant type of accommodation in the area. West Green is located approximately 5.7 miles from central London, making it a popular residential choice for those working in the city. West Green benefits from its proximity to several nearby transport links, including those connecting to Seven Sisters and beyond.
Fuel drain cover across Greater London, West Green included
West Green waits in the N postcode area, and our vans that answer petrol in diesel call-outs there work the locations around it as well — Harringay, Tottenham Green and Seven Sisters among them. A forecourt, a supermarket car park, a lay-by or your own drive are all locations we drain, and the vehicle does not need to move to us.
West Green: still at the pump?
In that case, you couldn't be in a better place. Keep it off. Call.