Should You Worry? Petrol in a Diesel Car in Hareleeshill
Not started? Then less anxious than you probably feel. Petrol resting in a diesel tank does nothing to your motor till something pulls it through the system — the ignition priming your pump, your starter, or driving on its own. So the truthful answer to the first query everyone around Hareleeshill asks, "have I wrecked it?", is generally no. Leave your motor off and phone Petrol in Diesel — that is how you keep it that way. The rest of this page sets out what petrol really does to a diesel, how to tell how far it has got, and how to make sure it doesn't happen to you a second time.
Petrol in a diesel: what does it do to the motor?
On its way through a motor, diesel has two jobs. Before it combusts, it lubricates — then it ignites. What stops the surfaces inside the high-pressure fuel pump and your injectors from wearing against one another is the diesel flowing through them — they are designed to very fine clearances.
The second task petrol doesn't do at all, and the first it does poorly. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump running on the mixture wearing itself. It's equally made to resist igniting under compression — the reverse of what a diesel needs — which is why you get the clattering.
Put these together and the shape of the trouble is clear. Contact doesn't do the damage — circulation does. Where the petrol is only in that tank, it is a fault of fuel, nothing more. Whatever a worn pump sheds travels on, carried by your fuel, into your injectors further along, which is why a pump that has worked on the petrol is where a mechanical fault starts.
Petrol in a diesel around Hareleeshill: how serious is it? Four cases
Filled but never started — as good as it gets. Only that tank has petrol in it, so the task is clearing that tank and purging your system where the vehicle sits. This situation can only really occur on a forecourt: anywhere else, your car got there by being driven.
Ignition on, or started for a second. The fuel system has been primed, so petrol has left the tank and got to your filter and the lines. Drain, flush, deal with your filter: still normally simple.
Your pump now spent a few miles on thinned fuel — that is what driving the car does. The work is your tank, the fuel lines, the fuel filter and fresh fuel through the whole system, and how hard the vehicle was driven counts as much as how far. On the school run to the local primary school, the miles is small. A run as far as Glasgow, under 15 miles away, is a very different task. So is any distance on the M74, under a mile from Hareleeshill, where your engine has been labouring hard throughout.
Driven till it protested. Rattling, a ragged idle, smoke, a throttle that has gone soft. That is your engine telling you its fuel has stopped acting like diesel. Leave it wherever it has stopped: a lay-by, a side street, the verge on Morris Street. Long-term damage is very uncommon when a car is stopped soon, and the drain and flush-through that still go first deal with it.
Stories Hareleeshill drivers hear about petrol in a diesel
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 just holds more of the same blend. The idea behind the guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
If anything, the opposite is true. Myth: "A modern diesel can cope with a bit of petrol." Smaller components and higher pressure are how a current diesel runs its fuel, and that makes the protection count more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there's no harm done." The driver of a petrol motor fed diesel normally has no choice but to stop, since it will not run, and the damage stops with them. Whilst the pump grinds, a diesel fed petrol usually starts, idles and drives away as though nothing has happened. Fine and running are not the same thing.
An old fix for a separate fault lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." What petrol has thinned remains thinned, and that petrol remains in your tank anyway.
Myth: "Drain that tank yourself and you're sorted." After the motor has run, some of the petrol is no longer inside the tank: it's in the filter and your lines, and it goes straight back through your pump on the next start. It's also genuinely hazardous to drain petrol into a can at the roadside.
How does petrol in a diesel occur?
On purpose? Never. Through carelessness? Seldom, if ever. One way only, since of the nozzles: the slimmer petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol car. That's how the forecourt makes it easy.
It takes place when routine and the car stop matching. Courtesy car, hire car, or a car that is brand new. Households running one of each, petrol and diesel. The pumps in a different order on a well-known forecourt. A train to catch, and a rushed fill en route to Larkhall. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist accustomed to petrol: exactly when it happens. Throw in rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
Avoiding petrol in a diesel next time you fill up around Hareleeshill
- The label is what counts, so read the petrol pump instead of the colour: in the UK unleaded handles are normally green and diesel black, yet not on each forecourt.
- In a car you do not know, look inside the flap over the filler or at the cap before your first fill: plenty of vehicles print the fuel type there.
- One of each in the house? Label the key to your diesel — a coloured fob, a sticker — since intending to remember isn't enough.
- It sounds silly and it works: on your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away then keep your mind on the petrol pump.
- Add-on devices are available for vehicles without one, and some diesels come with a filler that will not accept a petrol nozzle. Useful — but a backstop at best, never a reason to stop checking the label.
- Spotting it mid-fill? Stop at once. A weaker mix follows from less petrol in the tank, but the next stage remains the same: don't fire it up.
Petrol already in a diesel in Hareleeshill? Begin here
The order of things is brief, then. Don't switch your ignition on, and do not start it. If you are still at the forecourt — Shell or anywhere else — ask the attendants to help you push it away from the petrol pump. What went in, about how much, and if it's run: tell us that when you ring 0333 366 0103.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate problem — Hareleeshill has a page all for it.
One petrol in a diesel task around Hareleeshill costs more than another. Why?
The four scenarios above are four separate tasks, so no single price for this would be fair. Which of them you're in is chiefly what moves your cost. Two things follow that: the petrol that got in as a proportion of what your tank holds, then the place the vehicle is in and whether a van can reach it safely.
That's why our technicians ask three questions before quoting instead of after: what got in, how much, and if it's run. Their replies are what turn a range into one firm number.
About Hareleeshill
Hareleeshill is a suburban area situated on the riverside in South Lanarkshire, with a mix of semi-detached housing and local amenities. Hareleeshill sits at an elevation of 124 metres, near the communities of Shawsburn, Machan, and Burnhead. Hareleeshill is located approximately 14 miles from Glasgow, making it a commuter base for the city. Hareleeshill has a population of around 3030 residents, living in a relatively quiet environment.
Fuel drain cover across South Lanarkshire, Hareleeshill included
Our teams answering petrol in diesel calls around Hareleeshill, in the ML postcode area, also work the locations near it, Shawsburn, Machan and Burnhead among them. No need to bring the car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots where we work.
Still at the petrol pump in Hareleeshill?
Nothing beats it: that is where you now are. Leave it switched off, and ring.