Should You Worry? Petrol in a Diesel Car in Radipole
Unstarted? Then less worried than you likely are. Until your ignition primes your pump, your starter cranks, or the car is driven, petrol in a diesel tank simply waits there and does no harm. Which makes the honest reply to the first Radipole query — "have I ruined it?" — usually no. Keep it that way: leave your engine off then ring Petrol in Diesel. Further down, you will find what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you again.
Petrol in a diesel: what does it do to your engine?
Two tasks fall to diesel on its route through a motor. Lubricating comes before burning; it does both. What stops the surfaces inside the high-pressure pump and the injectors from wearing down against each other is your diesel flowing through them — they're made to very fine gaps.
Petrol does the first job badly and the second not at all. It's thinner than diesel and removes the protection the system depends on, and so a pump running on a petrol mixture 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 is where the knocking comes from.
Seen together, they show what shape the issue has. The harm is done by movement, not by contact. Where that petrol is only in your tank, it is an issue of fuel, nothing more. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with the fuel to your injectors further on.
Radipole, petrol in a diesel: four situations, from mild to major
The best case there can be: filled up, not once started. On a forecourt, and really only there, the petrol is still limited to that tank — since everywhere else the car was driven to get to it. The task is draining and flushing on the spot.
Your ignition switched on, or a brief start. With the system primed, the fuel lines and filter already contain petrol that came from the tank. Usually little more than emptying, flushing and seeing to the filter, and so still straightforward.
Driven a couple of miles. Now the pump has spent those miles working on thinned fuel. Tank, lines, filter, then fresh fuel run through the entire system: that's this work, and the way the vehicle was driven matters as much as the mileage. On the school run to Radipole Primary School, the miles is small. A run as far as Wells, under 50 miles away, is a very different task. So is any miles on the M5, under 50 miles from Radipole, where the motor has been working hard the whole time.
Driven on until it complained — rattling, smoke, a ragged idle, a dead throttle. The engine is telling you your fuel is no longer behaving like diesel. Whether it's the verge on Spa Road, a lay-by or a side street, stop there then leave it. The drain and flush still go first, and they sort it out: when a vehicle is stopped soon, lasting damage is very uncommon.
What Radipole people get told about petrol in a diesel — and the myths in it
Myth: topping up to full with diesel makes it fine. It doesn't. A bigger tank of the same mix is all you get, since topping up removes nothing. That guidance presumes a diesel fuel system handles petrol by percentage. It does not.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. Protection matters more on newer diesels, not less, because their fuel passes through more precise parts at higher pressure.
"It starts, it drives, so no harm done" — the myth that trips up most motorists than any other. Diesel in a petrol motor generally means a motor that won't run: the driver stops, and so does the damage. While the pump wears, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Fine and running aren't the same at all.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an old fix for a separate issue. What petrol has weakened remains thinned, and the petrol remains inside your tank anyway.
The next start sends petrol back round the pump out of your lines and your filter, where some of that ends up once your engine has run. That is why draining your tank yourself doesn't sort it — a myth. Also, a can of petrol drained by the roadside is genuinely risky.
Why petrol in a diesel occurs so easily
No one does it on purpose, and it's seldom carelessness. One way only, since of the nozzles: the slimmer 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 simple.
The moment habit stops matching the vehicle is the moment it occurs. A new motor, a hire car or a courtesy car. A household with one petrol and one diesel on the drive. A well-known forecourt with the pumps in a different order. Rushing for a train at Weymouth and fuelling up en route. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that's when. With rain, a call coming in, or children to deal with, your hand just does what it has always done.
Next time you fill up around Radipole: avoiding petrol in a diesel
- The label is what matters, so read the pump instead of the colour: in the UK unleaded handles are normally green and diesel black, but not on each forecourt.
- Many cars state the fuel type inside the filler flap or on the cap, and so check there on your first fill in a vehicle you do not know.
- Good intentions count for less than a sticker or a fob in a bright colour on the diesel's key when a home has one of each. So mark it.
- It sounds silly and it does the trick: on your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump.
- Tuck the phone away. This is an easy mistake to make whilst you are thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to refuse a petrol nozzle, and add-on devices exist for vehicles without one. They are a backstop, not a reason to stop reading the petrol pump.
- Stop the moment you notice. Less petrol in your tank means a weaker mix. It does not change what to do next, which is still not to fire it up.
Petrol already in a diesel in Radipole? Start here
Short and simple, then, is the order of things. Starting it is out, and so is switching on the ignition. The staff at the forecourt — whether at Morrisons itself or wherever you filled up — will usually help push it clear of the petrol pump if you ask. Next, 0333 366 0103. We will ask what was put in, roughly how much, and if it's been run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a different problem — Radipole has a page all for it.
Why one petrol in a diesel task in Radipole costs more than another
There's no fair single quote for this, because the four scenarios above are four different jobs. The situation itself does most of the work of moving the cost. The share counts next, meaning how much of the tank is petrol, and then the position of the car and whether getting to it is safe for a technician.
That is why we ask three questions before costing rather than after: what got in, how much, and if it's run. The answers change a range into a straight figure.
About Radipole and where it is
Radipole is a coastal suburban area in Dorset, situated near the seaside and close to other nearby places such as Southill and Coldharbour. Radipole has a population of around 2567 people and is characterised by predominantly detached housing. Radipole sits at a low elevation of 17 metres above sea level, looking out over the coastal scenery. Radipole is located some distance from major cities, with Wells being the nearest at 40.7 miles away and London at 118.4 miles away.
Across Dorset and around Radipole: fuel drain cover
The vans answering petrol in diesel jobs around Radipole, in the DT postcode area, equally work the locations near it, Southill, Coldharbour and Putton among them. The car doesn't need to move to us: our technicians drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
At the pump in Radipole, right now?
In that case, you could not be in a better position. Keep the car turned off, and ring.