Harcourt Hill: Petrol in a Diesel Car? How Worried to Be
Provided it hasn't been started, worry far less than you likely are. Everyone around Harcourt Hill starts with "have I wrecked it?", and the fair answer is normally no: petrol resting in the tank of a diesel stays harmless until priming, cranking or driving draws it into the fuel system. To leave the vehicle like that, call Petrol in Diesel then leave your motor switched off. What petrol actually does to a diesel, how to gauge how far it has gone, and how to stop it from happening a second time: that's the remainder of this page.
Inside your engine: what petrol in a diesel really does
Two jobs fall to diesel on its route round a motor. It burns, and before it ignites it lubricates. The high-pressure pump and the injectors are built to extremely fine tolerances, and your diesel passing through them is what keeps those surfaces from grinding against one another.
Petrol handles the first job badly and the second not at all. A pump running on a petrol mix is wearing itself out, since petrol is runnier than diesel and takes away the protection the fuel system depends on. Petrol is also made to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that's where the rattling starts.
Taken together, they show what shape the trouble has. Contact does not do the harm — circulation does. Where that petrol is only in your tank, it's a problem of fuel, nothing more. The start of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with your fuel to your injectors beyond it.
How bad is petrol in a diesel? Four situations we see around Harcourt Hill
Fuelled, and never started: no case is better. Only your tank has petrol in it, so the job is emptying your tank and purging the system where the vehicle sits. This scenario can only really occur on a forecourt: anywhere else, your car got there by being driven.
Started for a moment, or only your ignition on. Petrol has left your tank and got to the filter and the fuel lines, because the system has been primed. That's normally still an easy job — a drain, a flush, and the filter seen to.
The pump now spent a couple of miles on thinned fuel — that's what driving it meant. The work is the tank, the fuel lines, the fuel filter and fresh fuel through the entire system, and how hard the car was driven counts as much as how far. A school run to North Hinksey Church of England Primary School is one thing. Getting as far as Oxford, under 3 miles away, makes a very different job — as does any distance on the Wheatley Spur, under 10 miles from Harcourt Hill, with your engine running hard the whole time.
Rattling, an uneven idle, smoke, a throttle gone soft: driven till it complained. The motor is telling you your fuel is no longer behaving like diesel. Stop wherever you are — the verge on Stanton Road, a lay-by, a side street — then leave it there. What goes first is still the fuel drain and flush-through, and that deals with it, with permanent damage very rare if a vehicle is pulled over soon.
Petrol in a diesel myths Harcourt Hill drivers 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, since topping up removes nothing. Percentage isn't how a diesel fuel system copes with petrol, whatever that advice supposes.
"Newer diesels can handle a little petrol" — a myth, and closer to the opposite. Finer parts and higher pressure are how a current diesel runs its fuel, and that makes the protection count more, not less.
The myth that catches people off guard: if it starts and drives, it must be unharmed. Diesel in a petrol motor normally leaves a motor that will not run: the motorist stops, and so does the damage. While the pump grinds, a diesel fed petrol normally starts, idles and drives away as though nothing has happened. Being able to run is not proof of being fine.
An old workaround for a different problem is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." It does not put back what petrol has diluted, and that petrol is still inside that tank afterwards.
"Drain it yourself and you're sorted" — a myth, because after it's been running some petrol sits in the filter and lines, ready to go right back through the pump on the next start. It's also really hazardous to drain petrol into a can by the kerbside.
How petrol ends up: petrol in a diesel
A careless moment is rarely the cause, and nobody means to do it. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol vehicle at all. The forecourt makes it simple, and the error runs one way.
Habit and the vehicle getting out of step is when it takes place. A new motor, a hire car or a courtesy car. Households running one of each, petrol and diesel. The pumps in a different order on a familiar forecourt. Racing for a train at Oxford and fuelling up en route. Years of petrol motors behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that is when. Throw in rain, a phone call or a back seat full of children, and your hand repeats what it has always done.
How to avoid petrol in a diesel at your next fill-up around Harcourt Hill
- The label is what matters, so check the petrol pump rather than the colour: in the UK unleaded handles are usually green and diesel black, but not on each forecourt.
- Many vehicles state the fuel inside your filler flap or on the cap, and so check there on your first fill in any vehicle you don't know.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of meaning to remember, for a house with one of each.
- Before the nozzle comes off the pump the first time you fuel a hired or new car, say "diesel" out loud. Daft, perhaps, but it does the trick.
- Mistakes like this are easy to make whilst your mind is on something else, so the phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to block a petrol nozzle, and add-on devices exist for cars without one. They are a backstop, not a reason to stop checking the pump.
- Spotting it mid-fill? Stop there and then. A weaker blend results from less petrol inside that tank, but your next step stays the same: don't fire it up.
Petrol already in a diesel around Harcourt Hill? Start here
In that case, there's just a short order of things. Starting it is out, and so is turning on the ignition. If you are still on the forecourt — Sainsbury's or anywhere else — ask the attendants to help you push it clear of the petrol pump. What went in, about how much, and if it has run: tell us those when you phone 0333 366 0103.
Corrosion and deposits form the issue with AdBlue, where petrol means lost protection. So if it was AdBlue, say so — and read its own Harcourt Hill page.
Why one petrol in a diesel task in Harcourt Hill costs more than another
An honest single price does not exist here: four scenarios, four separate jobs. What shifts your cost is mostly which of them you are in. Next it's the share — how much petrol was put in against how much your tank holds — and then where the vehicle is and whether our van can get to it safely.
What got in, how much, and if it has run — three questions our engineers ask before quoting, not after, for exactly that reason. Those answers are what change a range into one firm number.
About Harcourt Hill
Harcourt Hill is a suburban area located near Oxford, sitting at an elevation of 116 metres in the inland countryside of Oxfordshire. Harcourt Hill is characterized by its semi-detached housing and is situated close to nearby places such as North Hinksey Village, Botley, and Cumnor Hill. Harcourt Hill has a population of approximately 1801 residents and is just 1.6 miles from Oxford, making it a convenient residential location. Harcourt Hill is also within commuting distance of London, being around 52.4 miles away.
Fuel drain cover in Harcourt Hill and across Oxfordshire
The vans answering petrol in diesel jobs around Harcourt Hill, in the OX postcode area, also work the locations near it, North Hinksey Village, Botley and Cumnor Hill among them. A forecourt, a supermarket car park, a lay-by or your own drive are all spots we drain, and your car does not need to come to us.
In Harcourt Hill and still at the petrol pump?
In that case, you could not be in a better position. Turned off it remains; then phone.