How Worried Should You Be? Petrol in a Diesel Car in Mount Pleasant
Likely less than you are now — as long as nobody has started the vehicle. Everyone in Mount Pleasant starts with "have I ruined it?", and the fair answer is usually no: petrol left inside your tank of any diesel remains harmless until priming, cranking or driving draws it into the system. Keep it like that: leave your engine off then ring Petrol in Diesel. The rest 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 again.
Petrol in a diesel: what does it do to your engine?
On its way through an engine, diesel has two jobs. It burns, and before it burns it lubricates. The high-pressure fuel pump and the fuel injectors are made to extremely fine tolerances, and the diesel passing through them is what keeps those surfaces from grinding against each other.
Of those two tasks, petrol handles the first badly and the second never. It's thinner than diesel and removes the lubrication your fuel system hinges on, and so a pump running on a petrol mix is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That's where the rattling comes from.
Seen together, they make clear the shape the trouble has. The harm is done by movement, not by contact. Petrol in a tank is a fuel problem. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with the fuel to your injectors further on.
How serious is petrol in a diesel? Four situations we see in Mount Pleasant
Fuelled up, never started. The best case there is. The petrol is inside your tank and only that tank, and the job is a drain and a flush where the car stands. This is the one scenario that can only truly occur on a forecourt, since anywhere else your car has been driven to get there.
Your ignition switched on, or a brief start. Your system has been bled, and so petrol has left that tank and reached the filter and your lines. Still normally easy: drain, flush, and the fuel filter sorted.
A couple of miles driven, and the pump has spent each of them running on thinned fuel. Tank, lines, filter, then clean fuel run through the entire system: that is this work, and the way the car was driven matters as much as the mileage. Short trips, like the school run to Saint Lawrence Church of England Primary School, are one matter. Any mileage on the M3, under 10 miles from Mount Pleasant, means your engine has worked hard throughout, and a run to Winchester, under 25 miles away, makes a very different task too.
Driven until it complained. Knocking, a ragged idle, smoke, a throttle that has gone soft. The motor is telling you your fuel is no longer behaving like diesel. Stop on the spot — on the verge on Brewery Gardens, at the kerb, down a side road — and do not move it. Long-term 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 Mount Pleasant people hear
Myth: topping up to full with diesel makes it fine. It does not. Topping up removes nothing; it gives you a fuller tank of the same mixture. Percentage is not how a diesel fuel system copes with petrol, whatever that guidance presumes.
Myth: a current diesel copes with a bit of petrol. Rather, the reverse. At higher pressure, through more precise parts: that is how a newer diesel handles its fuel, and so the lubrication counts for more, not less.
The myth that catches motorists out: if it starts and drives, it must be unharmed. Diesel in a petrol motor normally leaves a motor that will not run: the motorist stops, and so does the damage. Feed petrol to a diesel and it usually starts, idles and pulls away like nothing happened — all the while its pump wears. A running engine does not mean fine.
Not so: a two-stroke additive lets you to drive home. It is an old workaround, meant for another fault. What petrol has thinned remains thinned, and the petrol stays inside the tank anyway.
If your engine has been run, part of the petrol sits in your filter and the lines, not that tank — and the next start sends it straight back through your pump. So the myth "drain that tank yourself and you are sorted" does not hold. Clearing petrol into a can at the roadside is also really dangerous.
Petrol in a diesel: how does it occur?
It's rarely carelessness, and nobody does it on purpose. 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 motor at all. So the slip runs one way.
When routine and the vehicle stop matching, it happens. Any vehicle that is new to you — hired, on loan as a courtesy car, or brand new. Two cars on one driveway, one petrol, one diesel. A familiar forecourt with the pumps in a different order. A train to catch, and a hurried fill en route to Alton. Precisely the moment it happens: after years of driving petrol, someone fills a diesel Volkswagen Passat for the first time. With rain, a call coming in, or children to deal with, the hand just does what it has always done.
Mount Pleasant drivers: how to prevent petrol in a diesel next time
- The label is what matters, so read the petrol pump instead of the colour: in the UK unleaded handles are usually green and diesel black, but not on each forecourt.
- Check the filler flap. Many vehicles state the fuel inside the flap or on the cap. Look at it on the first fill in a car you don't know.
- A coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember, for a house with one of each.
- Before the nozzle leaves the petrol pump the first time you fill a hired or new motor, say "diesel" aloud. Daft, yes, but it does the trick.
- Tuck the phone away. This is an easy mistake to make whilst you are thinking about something else.
- Some diesels come with a filler designed to block a petrol nozzle, and devices you can add exist for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the petrol pump.
- Noticing it mid-fill? Stop there and then. A thinner mix follows from less petrol inside the tank, but the next stage stays the same: don't start it.
Put petrol in a diesel around Mount Pleasant already?
Short and simple, then, is the order of things. Do not switch the ignition on, and don't crank it. Ask the attendants to help you push it away from the petrol pump if you're still on the forecourt, whether that is the nearest petrol station or somewhere else. Then ring 0333 366 0103 and tell us what got in, about how much, and whether it's run.
Say so if it was AdBlue instead of petrol: it is a different fault, with its own page for Mount Pleasant, because AdBlue brings corrosion and deposits instead of lost protection.
Why one petrol in a diesel job around Mount Pleasant costs more than another
There is no fair single quote for this, because the four situations above are four different tasks. What moves your cost is mostly which of them you are in. After that it is the proportion — how much petrol was put in against how much that tank takes — and after that where the car is and whether our van can get to it safely.
Ahead of any quote, not after, come three questions: your fuel that got in, the volume, and if it has run. That is why. Given the answers, there is a straight figure instead of a range.
About Mount Pleasant itself
Mount Pleasant is a suburban area located on the riverside in Hampshire, with a mix of flat dwellings and other residential properties. Mount Pleasant sits at an elevation of 109 metres, near the cities of Winchester and Alton, and is part of the wider South East region. Mount Pleasant is positioned approximately 15.7 miles from Winchester and 44.3 miles from London, with nearby areas including Newtown and The Butts. Mount Pleasant has a population of around 5681 residents.
Fuel drain cover across Hampshire, Mount Pleasant included
Petrol in diesel jobs around Mount Pleasant — part of the GU postcode area — go to teams that likewise cover the places around it, Alton, Newtown and The Butts included. Our technicians drain where your car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
In Mount Pleasant and still at the petrol pump?
Then, you couldn't be in a better place. Call, and keep it switched off.