Petrol in a Diesel Car in Sandleheath: How Worried Should You Be?
Far less than you probably are, provided it has not been started. Everyone around Sandleheath starts with "have I wrecked it?", and the fair answer is generally no: petrol resting in that tank of any diesel remains harmless until priming, cranking or driving draws it into the system. To leave the car like that, call Petrol in Diesel and leave your motor alone. What petrol really does to a diesel, how to gauge how far it's travelled, and how to stop it from happening again: that is the remainder of this page.
Petrol in a diesel: what does it do to the engine?
Diesel has two jobs on its way through a motor. It ignites, and before it ignites it protects. What keeps the surfaces inside the high-pressure fuel pump and your injectors from wearing down against each other is your diesel flowing through them — they're designed to extremely fine tolerances.
Of these two jobs, petrol manages the first poorly and the second not at all. Being less viscous than diesel, petrol strips out the protection a fuel system needs, so a pump running on the mixture to wear itself. It is also made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the rattling.
The shape of the problem is clear once you put those together. Not contact but circulation is what causes the harm. A tank with petrol in it is a fuel fault. After your pump has been labouring on that petrol, a mechanical problem has started: whatever is shed by a pump that is wearing is carried downstream to the fuel injectors with your fuel.
How serious is petrol in a diesel? Four situations we see around Sandleheath
The best case there is: filled up, not once started. The petrol is in the tank and just that tank, and the job is a drain and a flush where your car sits. This is the one situation that can only really occur at a forecourt, since anywhere else your car has been driven to get there.
Ignition on, or started for a moment. Petrol has left your tank and got to your filter and the fuel lines, because your system has been primed. That's generally still a simple job — a drain, a flush, and the filter dealt with.
The 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 entire system, and how hard the vehicle was driven matters as much as how far. On the school run to St James' Church of England First School and Nursery, Alderholt, the miles is short. A run as far as Salisbury, under 10 miles away, is a very different job. So is any mileage on the M27, under 15 miles from Sandleheath, where the motor has been working hard the whole time.
Rattling, an uneven idle, smoke, a throttle gone soft: driven until it complained. The fuel isn't acting like diesel any more, and your engine is telling you. Stop where you are — on the verge on Elms Close, at the kerb, down a side road — and do not move it again. What comes first is still the drain and flush-through, and that deals with it, with lasting damage very unusual when a car is stopped soon.
Myths Sandleheath motorists hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing comes out when you top up — the tank just carries more of the same blend. The assumption behind that guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
"Newer diesels can handle a little petrol" — a myth, and closer to the reverse. Smaller parts and higher pressure are how a current diesel runs its fuel, and that makes the lubrication count more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there's no damage done." Feed diesel to a petrol motor and it usually won't run, and so the motorist stops — and the harm stops with them. Feed petrol to a diesel and it usually starts, idles and pulls away like nothing has happened — all while its pump is wearing. 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 fault. None of what petrol thinned gets put back by it — and later, your tank still contains that petrol.
Once the motor has been run, part of the petrol sits in the filter and your lines, not that tank — and your next start sends it right back through the pump. So the myth "drain that tank yourself and you're sorted" doesn't hold. And, a can of petrol filled by the kerbside is truly hazardous.
How it happens: petrol in a diesel
Nobody does it on purpose, and it is rarely carelessness. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle generally won't go into a petrol motor at all. So the error runs one way.
The moment routine stops matching your car is the moment it occurs. A new car, a hire car or a courtesy car. Two vehicles on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. Rushing for a train outside Salisbury and fuelling up en route. A new-to-you diesel Volkswagen Passat, its first fuelling, and a driver used to petrol: precisely when it takes place. The hand repeats what it has always done when you add rain, a phone call or a back seat full of kids.
Preventing petrol in a diesel next time you fill up in Sandleheath
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Read the petrol pump's label; the colour is only a hint.
- Inspect your filler flap. Plenty of vehicles state the fuel inside the flap or on the cap. Look at it on your first fill in any motor you do not know.
- A coloured fob or a sticker on your diesel's key does more than any amount of intending to remember, in a house with one of each.
- It seems silly and it works: on your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump.
- Thinking about something else is when this becomes an easy mistake to make, so put your phone away then keep your mind on the pump.
- Add-on devices are available for cars without one, and some diesels are built with a filler that won't take a petrol nozzle. Helpful — but a safety net at best, never a reason to stop checking the label.
- Less petrol makes a thinner blend, and so stop as soon as you notice — though remembering that the next step is unchanged. It is still not to start the car.
Put petrol in a diesel around Sandleheath already?
Short and simple, then, is the order of things. Starting it is out, and so is turning on your ignition. The attendants at the forecourt — whether at Harvest Energy itself or wherever you filled up — will normally help push it clear of the pump if you ask. Then call 0333 366 0103 and tell us what went in, roughly how much, and if it's run.
If it was AdBlue instead of petrol, say so. That's a different issue — corrosion and deposits instead of lost protection — and it has its own page for Sandleheath.
What makes one Sandleheath petrol in a diesel task cost more than the next
The four situations above are four different tasks, so no single price for this would be fair. Chiefly, your cost moves with which one you are in. Two things come after that: the petrol that went in as a share of what that tank takes, then the place the car is in and whether our van can get to it safely.
What got in, how much, and whether it has run — three queries our technicians ask before quoting, not after, for exactly that reason. The answers turn a range into a straight figure.
About Sandleheath and where it is
Sandleheath is a village in Hampshire, situated on the banks of the River Avon at an elevation of around 57 metres. Sandleheath lies near the city of Salisbury, approximately 9.6 miles away, and is surrounded by other small villages such as Brickhill and Ashford. Sandleheath has a population of around 605 people and predominantly features detached housing. Sandleheath is located in the South East region of England, about 83.4 miles from London.
Across Hampshire and in Sandleheath: fuel drain cover
The teams answering petrol in diesel call-outs in Sandleheath, in the SP postcode area, equally work the locations near it, Brickhill, Ashford and Tinkers Cross among them. The car does not need to come to us: our technicians drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the petrol pump in Sandleheath?
In that case, you could not be in a better spot. Switched off it remains; then ring.