Should You Worry? Petrol in a Diesel Car in Tiddington
Not started? Then less worried than you likely are. "Have I wrecked it?" is the first question anyone in Tiddington asks, and the honest answer is generally no, because petrol left in a diesel tank harms nothing until it's dragged through the system — by ignition priming, by your starter, or by being driven. To keep it 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 clues of how far it has spread, and ways to make sure you never do it again.
Inside the engine: what petrol in a diesel really does
Passing through an engine, diesel is doing two things at once. Before it combusts, it protects — and then it combusts. The high-pressure fuel pump and the injectors are designed to very fine clearances, and your diesel passing through them is what keeps those surfaces from grinding against each other.
Petrol handles the first task badly and the second not at all. The clattering 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 the fuel system depends on, and any pump running on such a mix is wearing itself.
Together, those leave the shape of the issue plain. It is movement that does the harm, not contact. Where the petrol is only inside the tank, it's an issue of fuel, nothing more. Once the pump has been working on that petrol, a mechanical fault has started: anything shed by a pump that is wearing down is carried downstream to the fuel injectors with the fuel.
Petrol in a diesel around Tiddington: how serious is it? Four situations
The best case there is: filled up, not once started. Only the tank has petrol in it, so the job is clearing that tank and cleaning your system where the vehicle stands. This scenario can only truly occur at a forecourt: anywhere else, the vehicle got there by being driven.
A moment's running, or just your ignition on. Once primed, your system has drawn petrol out of that tank as far as the fuel filter and your lines. Still generally straightforward: drain, flush, and the filter seen to.
The pump has spent a few miles on diluted fuel — that's what driving it does. Tank, lines, filter, then clean fuel put through the entire system: that is this work, and the way the car was driven counts as much as the mileage. Driving the kids to Alveston CofE Primary School is one sort of trip. Any distance on the M40, under 5 miles from Tiddington, means your engine has worked hard throughout, and a run to Coventry, under 25 miles away, makes a very different task too.
Rattling, a lumpy idle, smoke, a throttle gone soft: driven till it complained. The fuel is not behaving like diesel any more, and the engine is telling you. Stop wherever you are — the verge on School Lane, a lay-by, a side street — then leave the car where it is. A vehicle pulled over soon very seldom has long-term damage, because the fuel drain and the flush, which still go first, deal with it.
What Tiddington drivers get told about petrol in a diesel — and the stories in it
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing is removed when you top up — the tank just holds more of the same blend. The idea behind that guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: a newer diesel copes with a bit of petrol. If anything, the opposite. Finer parts and higher pressure are how a modern diesel runs its fuel, and that makes the lubrication count more, not less.
Myth: "If it starts and drives, there's no harm done." This is the one that catches drivers. The motorist of a petrol engine fed diesel usually stops, since it will not run, and the damage stops there. Whilst your pump grinds, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. A running engine does not mean fine.
Myth: "Add some two-stroke oil and drive it home." It's an outdated fix for a distinct problem. The petrol is still in your tank after that, and what it has weakened is not put back.
If the engine has been run, part of that petrol is in the filter and your lines, not your tank — and the next start sends it straight back through the pump. So the myth "drain your tank yourself and you're sorted" doesn't stand up. Emptying petrol into a can by the kerbside is also truly dangerous.
Why petrol in a diesel happens so easily
It is rarely carelessness, and nobody does it on purpose. The petrol nozzle is the smaller of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol motor at all. The forecourt makes it easy, and the slip runs one way.
It takes place when routine and your car stop matching. Courtesy car, hire car, or a car that's new. A household with one petrol and one diesel on the driveway. Your normal forecourt, its pumps suddenly in a different order. A rushed fill on the way to Stratford-upon-Avon with a train to catch. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that is when. Your hand repeats what it has always done once you add rain, a phone call or a back seat full of kids.
Next time you fill up around Tiddington: preventing petrol in a diesel
- Green for unleaded and black for diesel is normal in the UK — yet not on every forecourt. Go by the label on the pump, not the colour.
- Plenty of motors state the fuel type inside the filler flap or on the cap, so check there on your first fill in any vehicle you don't know.
- Good intentions do less than a sticker or a fob in a bright colour on the diesel's key if a house has one of each. So label it.
- It sounds silly and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump.
- Thinking about something else is when this becomes an easy mistake to make, so tuck your phone away then keep your mind on the pump.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to reject a petrol nozzle, and add-on devices are available for the remainder. Treat it as a safety net, and keep checking the petrol pump.
- The moment you realise, stop: less petrol in your tank makes a weaker mixture. What to do next does not change, though — still do not fire it up.
Tiddington: already put petrol in a diesel?
In that case, there is only a short order of things. Don't switch the ignition on, and don't start it. Still on the forecourt, at Shell or anywhere else? Ask the staff to help you roll the car clear of the pump. Then call 0333 366 0103 and tell us what was put in, roughly how much, and whether it's run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a different issue — Tiddington has a page all for it.
Tiddington petrol in a diesel jobs: why one costs more than another
There is no fair single quote for this, since the four situations above are four different jobs. What moves your cost is mostly which of them you're in. The ratio counts next, meaning how much of that tank is petrol, followed by the location of the car and whether reaching it is safe for a van.
Three questions come first, before any quote, instead of after — what was put in, how much, has it run — and this is the reason. Those answers are what change a range into one firm number.
About Tiddington
Tiddington is a village situated on the banks of the River Avon in Warwickshire, with Alveston Hill and the nearby villages of Alveston and Ingon forming part of its scenic riverside setting. Tiddington has a population of around 1326 residents and is characterized by its semi-detached housing stock. Tiddington lies approximately 43 metres above sea level and is located about 16 miles from Coventry, making it a commuter-friendly location. Tiddington is also within reasonable distance of London, being around 81.6 miles away.
Across Warwickshire and around Tiddington: fuel drain cover
Alveston Hill, Alveston and Ingon are among the places around Tiddington that the same vans work, answering petrol in diesel call-outs across Tiddington's CV postcode area. The car does not need to move to us: our engineers drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
In Tiddington and still at the petrol pump?
The best spot there is, then — that is where you are. Switched off it stays; then ring.