How Worried Should You Be? Petrol in a Diesel Car in Sandford
Far less than you likely are, provided it has not been started. Petrol sitting in a diesel tank does nothing to the motor until something pulls it through the system — your ignition priming your pump, your starter, or driving on its own. So the honest answer to the first query everyone in Sandford asks, "have I ruined it?", is usually no. Keep it like that: leave your motor off then ring Petrol in Diesel. The remainder of this page explains what petrol really does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you a second time.
The motor and petrol in a diesel: what goes on
Passing through an engine, diesel does two things at the same time. Oiling comes before burning; it does both. What stops the surfaces inside the high-pressure fuel pump and the fuel injectors from wearing down against one another is your diesel passing through them — they are built to very fine gaps.
Of these two tasks, petrol handles the first poorly and the second not at all. Being less viscous than diesel, petrol strips away the protection a fuel system needs, so a pump on the blend wearing itself. It is equally made to resist igniting under compression — the opposite of what a diesel needs — which is why you get the clattering.
Put those together and the shape of the issue is plain. It is circulation that does the damage, not contact. Petrol in a tank is a fuel problem. Whatever a worn pump sheds goes on, borne by the fuel, into the fuel injectors downstream, which is why a pump that has been working on that petrol is where a mechanical problem starts.
Four scenarios we see around Sandford: how serious is petrol in a diesel?
Filled up, and not started: nothing beats it. The petrol is inside that tank and just the tank, and the job is a drain and a flush where the vehicle stands. This is the one scenario that can only really take place at a forecourt, as anywhere else your car has been driven to get there.
A brief spell of running, or just the ignition on. Your system has been bled, so petrol has left your tank and reached the filter and your lines. That is generally still a straightforward task — a drain, a flush, and the filter seen to.
Your pump now worked a few miles on weakened fuel — that's what driving it meant. How hard the vehicle was driven counts as much as how far, and the work takes in your tank, the lines, your filter and clean fuel through the entire circuit. Driving the kids to Sandford St Martin's Church of England Voluntary Aided Primary School is one sort of trip. Getting as far as Salisbury, under 50 miles away, makes a very different task — as does any mileage on the M27, under 50 miles from Sandford, with your engine running hard all the way.
It protested, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone uneven. That is your engine telling you its fuel has stopped acting like diesel. Stop wherever you are — the verge on Miles Avenue, a lay-by, a side street — then leave the car there. Permanent damage is very rare if a vehicle is stopped quickly, and the fuel drain and flush that still come first sort it out.
Petrol in a diesel stories Sandford people hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." A bigger tank of the same mixture is all it gives, since topping up removes nothing. A diesel fuel system doesn't tolerate petrol by percentage in the way that guidance assumes.
If anything, the opposite holds. Myth: "A newer diesel can cope with a bit of petrol." A modern diesel runs its fuel through smaller parts at higher pressure, which makes the lubrication count more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that catches motorists. Diesel in a petrol motor normally means a motor that won't run: the motorist stops, and so does the harm. A diesel fed petrol normally starts, idles and drives away as though nothing has happened, while the pump wears. A running engine does not mean fine.
Not so: a two-stroke additive makes it safe to drive home. It was an old workaround, meant for another problem. The petrol is still inside your tank afterwards, and whatever it has diluted isn't put back.
Myth: "Drain your tank yourself and you are sorted." After the motor has been run, some of that petrol is no longer inside that tank: it is in the filter and your lines, and it goes straight back through your pump on the next start. It's also really hazardous to drain petrol into a can by the roadside.
Petrol in a diesel: how does it happen?
It is rarely carelessness, and nobody does it on purpose. One way only, since of the nozzles: the smaller petrol one slips inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol vehicle. That's how the forecourt makes it straightforward.
It occurs when routine and the vehicle stop matching. Courtesy car, hire car, or a car that's new. One petrol and one diesel on the driveway of the same household. The pumps in a different order on a familiar forecourt. A rushed fill on the way to Holton Heath with a train to catch. Precisely the moment it occurs: after years of driving petrol, someone fills a diesel Volkswagen Passat for the first time. Add rain, a phone call or a back seat full of children, and the hand does what it has always done.
Avoiding petrol in a diesel next time you fill up around Sandford
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most usually do. Read the petrol pump's label; the colour is just a clue.
- In a car you do not know, look inside the flap over the filler or at the cap before your first fill: plenty of cars state the fuel there.
- Good intentions do less than a sticker or a fob in a bright colour on your diesel's key if a household has one of each. So label it.
- "Diesel", aloud, before you pick up the nozzle — each time a new or hired car needs its first tank. It seems silly. It works.
- Whilst you're thinking about something else, this is an easy mistake to make — so put your phone away.
- Some diesels come with a filler designed to reject 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.
- As soon as you realise, stop: less petrol inside your tank means a thinner blend. What to do next does not change, though — still do not fire it up.
Put petrol in a diesel in Sandford already?
Then, there's just a short order of things. Do not turn your ignition on, and don't crank it. Ask the staff to help you push it clear of the petrol pump if you're still at the forecourt, whether that's Texaco or somewhere else. Next, 0333 366 0103. We'll ask what got in, roughly how much, and if it's been run.
Say so if it was AdBlue rather than petrol: it's a separate fault, with its own page for Sandford, because AdBlue brings corrosion and deposits instead of lost lubrication.
What makes one Sandford petrol in a diesel job cost more than the next
Four different jobs sit behind the four situations above — which is why there's no honest single price. Which of them you are in is mostly what shifts your cost. Beyond that it is the share — how much petrol went in against how much your tank takes — and after that where the car is and whether a technician can reach it safely.
Three queries come first, before quoting, instead of after — what went in, how much, has it run — and this is the reason. Those replies change a range into a straight figure.
About Sandford
Sandford is a small coastal village in Dorset, situated near the shores of Poole Harbour at an elevation of around 16 metres. Sandford lies within a short distance of Sandford Woods and other nearby places such as Northport and Holton Heath. Sandford has a population of approximately 1168 people and is characterised by predominantly detached housing. Sandford is located about 28 miles from Salisbury and around 102 miles from London.
Sandford and Dorset: where our fuel drain cover runs
Sandford Woods, Northport and Holton Heath are among the locations around Sandford that the same vans work, answering petrol in diesel jobs across Sandford's BH postcode area. The vehicle does not need to move to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the petrol pump around Sandford?
In that case, you couldn't be in a better place. Keep it switched off, then ring.