How Worried Should You Be? Petrol in a Diesel Car in South Ruislip
Far less than you probably are, provided it has not been started. Everyone in South Ruislip begins with "have I wrecked it?", and the fair answer is generally no: petrol resting inside the tank of a diesel remains harmless until priming, cranking or driving pulls it into the system. Keep it like that: leave the engine off and call Petrol in Diesel. Further down, you will find what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you again.
What petrol in a diesel does to the engine
On its way through a motor, diesel has two jobs. Lubricating comes before burning; it does both. The high-pressure fuel pump and the fuel injectors are made to extremely fine clearances, and the diesel passing through them is what stops those surfaces from grinding against one another.
The second job petrol does not do at all, and the first it does badly. The clattering comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips away the lubrication your system hinges on, and any pump running on such a blend is wearing itself.
Put these together and the shape of the trouble is plain. It is circulation that does the damage, not contact. All a tank with petrol in it amounts to is a fuel problem. A pump that has been running on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with the fuel to your injectors downstream.
South Ruislip, petrol in a diesel: four situations, from mild to major
Fuelled but not once started — as good as it gets. The petrol is in your tank and just the tank, and the job is a drain and a flush where the vehicle stands. This is the one situation that can only really take place at a forecourt, since anywhere else your car has been driven to get there.
Started for a moment, or only the ignition on. Your system has been bled, and so petrol has left the tank and reached the filter and the lines. Usually nothing more than emptying, rinsing and seeing to your filter, so still easy.
Those few miles driven meant your pump labouring on fuel weakened by petrol the whole way. Tank, lines, filter, then fresh fuel run through the whole system: that's this work, and the way the vehicle was driven matters as much as the distance. Short trips, such as the school run to Deanesfield Primary School, are one thing. A run as far as Westminster, under 15 miles away, is a very different task. So is any distance on the M40, under 5 miles from South Ruislip, where your engine has been running hard the whole time.
Knocking, a lumpy idle, smoke, a throttle gone soft: driven till it complained. The fuel isn't behaving like diesel any more, and the engine is saying so. Leave it where it has stopped: a lay-by, a side street, the verge on The Fairway. A vehicle stopped soon very seldom has permanent damage, because the fuel drain and the flush-through, which still go first, take care of it.
What South Ruislip drivers get told about petrol in a diesel — and the stories in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing is removed when you top up — that tank simply holds more of the same blend. That advice presumes a diesel fuel system tolerates petrol by percentage. It does not.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. More precise parts and higher pressure are the way a current diesel runs its fuel, and that makes the lubrication count more, not less.
One myth that catches people out: if it starts and drives, it must be unharmed. The driver of a petrol motor fed diesel normally has no choice but to stop, since it will not run, and the damage stops there. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile the pump wears. Running isn't the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a distinct issue. What petrol has weakened remains weakened, and the petrol stays inside your tank regardless.
"Drain it yourself and you are sorted" — a myth, since after it's been running some petrol sits in your filter and lines, waiting to go right back through the pump on your next start. Clearing petrol into a can at the kerbside is also genuinely dangerous.
How does petrol in a diesel take place?
It is seldom carelessness, and nobody does it on purpose. One way only, since of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one mostly will not fit a petrol vehicle. That is how the forecourt makes it easy.
Habit and the vehicle falling out of step is when it occurs. Hire cars, courtesy cars, and vehicles that are new to you. One petrol and one diesel on the drive of the same household. A well-known forecourt with the pumps in a different order. A train to catch, and a hurried fill en route to the nearest station. The first fill-up in a diesel Renault Megane after years of driving petrol is precisely the moment it takes place. Add a back seat full of children, a phone call or rain, and the hand wins.
South Ruislip people: how to prevent petrol in a diesel next time
- The label is what counts, and so read the pump instead of the colour: in the UK unleaded handles are normally green and diesel black, but not on every forecourt.
- In a motor you don't know, look inside the flap over your filler or at the cap before your first fill: plenty of cars print the fuel there.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, in a home with one of each.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump. It sounds silly and it works.
- Tuck the phone away. This is an easy mistake to make while you are thinking about something else.
- Some diesels have a filler built to block a petrol nozzle, and devices you can add are available for motors without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump.
- The moment you notice, stop: less petrol inside that tank means a weaker mix. What to do next does not change, though — still do not crank it.
Put petrol in a diesel in South Ruislip already?
Short and simple, then, is the order of things. Do not crank it, and don't turn your ignition on. Still at the forecourt, at BP or anywhere else? Ask the attendants to help you roll the car clear of the petrol pump. Next, 0333 366 0103. We'll ask what was put in, about how much, and if it's been run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a separate problem — South Ruislip has a page all for it.
South Ruislip petrol in a diesel tasks: why one costs more than another
The four situations above are four different tasks, so no single quote for this would be honest. The scenario itself does most of the work of moving your cost. Where your car is counts too, and whether our van can safely reach it, after the proportion of petrol to what that tank takes.
Before any quote, not after, come three queries: the fuel that went in, its quantity, and if it has run. That is why. A range turns into a straight figure once the answers are in.
About South Ruislip and its setting
South Ruislip is a suburban area in northwest London, situated near the River Pinn and the Grand Union Canal. South Ruislip has a mix of semi-detached housing and other residential properties, with nearby amenities and transport links to central London. South Ruislip is close to several other suburban areas, including Ruislip Manor and South Harrow. South Ruislip sits at an elevation of around 38 metres above sea level, approximately 12 miles from the centre of London.
Fuel drain cover around South Ruislip and across Greater London
Ruislip Manor, South Harrow and Ruislip Gardens are among the spots near South Ruislip that the same vans work, answering petrol in diesel call-outs across South Ruislip's HA postcode area. A forecourt, a supermarket car park, a lay-by or your own drive are all locations our technicians drain, and the car does not need to come to us.
In South Ruislip and still at the petrol pump?
Then you are in the best spot there is. Leave the car switched off, then ring.