Sands End: Petrol in a Diesel Car? How Worried to Be
Not started? Then less worried than you probably feel. Everyone in Sands End starts with "have I wrecked it?", and the fair answer is usually no: petrol resting inside the tank of a diesel stays harmless until priming, cranking or driving pulls it into the system. To keep the car like that, phone Petrol in Diesel and leave your motor switched off. Read on for three things: the effect petrol has inside a diesel engine, the clues of how far it has got, and ways to make sure you never do it again.
The motor and petrol in a diesel: what goes on
Passing through an engine, diesel does two things at the same time. It protects to begin with, and only then does it burn. Your high-pressure pump and the fuel injectors are made to extremely fine gaps, and the diesel passing through them is what keeps those surfaces from grinding against one another.
Petrol does the first job poorly and the second not at all. Being less viscous than diesel, petrol strips away the lubrication a fuel system needs, leaving a pump on the blend to wear itself. It's also made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the rattling.
Put those together and the shape of the trouble is clear. It's circulation that causes the damage, not contact. Petrol in the tank is a fuel problem. Once the pump has been running on that petrol, a mechanical fault has begun: whatever is shed by a pump that's wearing travels onward to your injectors with the fuel.
Petrol in a diesel around Sands End: how bad is it? Four situations
Fuelled but never started — the best it gets. At a forecourt, and genuinely only there, the petrol is still confined to the tank — because everywhere else your car was driven to get to it. The job is emptying and rinsing on the spot.
The ignition turned on, or a brief start. Petrol has left your tank and got to the filter and the fuel lines, since the system has been bled. Still normally straightforward: drain, flush, and your filter seen to.
Driven a few miles. Now your pump has spent those miles labouring on weakened fuel. Mileage is only half of that; how hard it was driven matters equally. Either way the work includes the tank, your lines, your filter and fresh fuel through the entire system. Driving the children to Langford Primary School is one kind of trip. A run as far as Westminster, under 5 miles away, is a very different job. So is any distance on the M4, under 5 miles from Sands End, where the motor has been working hard the whole time.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone ragged. What you are hearing is the engine signalling fuel that no longer behaves like diesel. Stop wherever you are — the verge on Tynemouth Street, a lay-by, a side street — then leave it where it is. A vehicle stopped soon very seldom has long-term damage, because the drain and the flush-through, which still come first, deal with it.
Myths Sands End drivers hear about petrol in a diesel
Myth: topping up to full with diesel makes it fine. It does not. Topping up removes nothing; it gives you a bigger tank of the same mixture. That guidance supposes a diesel fuel system tolerates petrol by percentage. It doesn't.
Myth: a modern diesel copes with a bit of petrol. Rather, the reverse. Protection counts more on modern diesels, not less, since their fuel passes through smaller components at higher pressure.
This is the one that fools motorists. Myth: "If it starts and drives, there's no damage done." Any petrol motor fed diesel normally won't run, so the driver stops and the harm stops with them. A diesel fed petrol usually starts, idles and drives away as if nothing has happened, whilst your pump grinds. Running doesn't mean fine.
Myth: "Add some two-stroke oil and drive it home." It's an outdated workaround for a separate fault. None of what petrol diluted is put back by it — and afterwards, the tank still contains the petrol.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol sits in the fuel filter and lines, ready to go right back through your pump on the next start. On top of that, petrol emptied into a can by the road is genuinely risky.
Why petrol in a diesel takes place so easily
Carelessness is seldom the cause, and no one means to do it. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle generally won't go into a petrol car at all. So the slip runs one way.
When habit and the vehicle stop matching, it happens. Courtesy car, hire car, or a car that is brand new. One petrol and one diesel on the drive of the same household. The pumps in a different order on a well-known forecourt. Filling up in a rush en route to Imperial Wharf, with a train to catch. The first fill-up in a diesel Renault Megane after years of driving petrol is exactly the moment it takes place. The hand does what it has always done when you add rain, a phone call or a back seat full of children.
Sands End people: how to prevent petrol in a diesel next time
- Check the pump, not the colour. In the UK unleaded handles are normally green and diesel black, yet not on every forecourt. The label is what counts.
- The first fill in a strange motor is the time to check your filler flap — inside it, or on the cap, many cars state the fuel to use.
- Mark your key. In a household with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It seems silly and it works.
- Thinking about something else is when this becomes an easy mistake to make, and so put your phone away then keep your mind on the pump.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler built to refuse a petrol nozzle, and add-on devices exist for vehicles without one. They are a safety net, not a reason to stop reading the pump.
- Noticing it halfway? Stop there and then. A thinner blend follows from less petrol inside your tank, yet your next stage remains the same: do not crank it.
Petrol already in a diesel in Sands End? Start here
Short and simple, then, is the order of things. Don't turn the ignition on, and do not crank it. The staff on the forecourt — whether at Esso itself or wherever you filled up — will usually help roll it clear of the petrol pump if you ask. Next, 0333 366 0103. We will ask what went in, about how much, and if it's been run.
If it was AdBlue and not petrol, say so. That is a separate problem — corrosion and deposits and not lost lubrication — and it has its own page for Sands End.
What makes one Sands End petrol in a diesel job cost more than the next
Four separate tasks lie behind the four scenarios above — which is why there's no fair single price. Which of them you're in is chiefly what shifts the cost. After that it is the ratio — how much petrol went in against how much your tank holds — and after that where the car is and whether a technician can get to it safely.
Before any quote, not after, we ask three questions: the fuel that got in, its volume, and if it's run. That's why. Those replies are what change a range into one firm number.
About Sands End itself
Sands End is a suburban area in southwest London, situated on the north bank of the River Thames. Sands End has a low elevation of around 8 metres above sea level and is located close to neighbouring areas such as Battersea and Parsons Green. Sands End is characterized by its predominantly flat-type housing and is a short distance from central London, with Westminster just 3.2 miles away.
Sands End and Greater London: where our fuel drain cover runs
Sands End waits in the SW postcode area, and our vans that answer petrol in diesel calls there work the spots near it as well — Battersea, Walham Green and Parsons Green among them. Our technicians drain wherever the car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Sands End: still at the pump?
Then, you could not be in a better place. Switched off it stays; then call.