How Worried Should You Be? Petrol in a Diesel Car in Eastry
Provided it hasn't been started, you can worry less than you likely are. Everyone around Eastry starts with "have I wrecked it?", and the honest answer is generally no: petrol resting in the tank of a diesel remains harmless until priming, cranking or driving pulls it into the system. Keep it that way: leave your engine off then ring Petrol in Diesel. The rest of this page explains what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you again.
Inside the motor: what petrol in a diesel does
Two jobs fall to diesel on its journey through a motor. Lubricating comes before burning; it does both. What keeps the surfaces inside your high-pressure pump and your injectors from wearing against each other is your diesel passing through them — they're designed to extremely fine clearances.
Poorly at the first, not at all at the second: that is petrol. The knocking comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips away the lubrication the system rests on, and any pump running on such a mix is wearing itself.
Combined, those leave the shape of the problem plain. Contact doesn't do the damage — movement does. Petrol in the tank is a fuel issue. Once your pump has been labouring on that petrol, a mechanical problem has begun: whatever is shed by a pump that's wearing down is carried downstream to your injectors with your fuel.
Petrol in a diesel in Eastry: how bad is it? Four situations
Fuelled, and never started: no case is better. Only your tank has petrol in it, so the task is clearing the tank and cleaning your system where the car sits. This scenario can only truly happen on a forecourt: anywhere else, the vehicle got there by being driven.
Your ignition turned on, or a brief start. The fuel system has been bled, so petrol has left the tank and got to the filter and your lines. Still generally easy: drain, flush, and the fuel filter sorted.
Your pump now worked a few miles on thinned fuel — that is what driving it meant. Tank, lines, filter, then fresh fuel run through the whole circuit: that's the work, and the way your car was driven counts as much as the distance. On the school run to Eastry Church of England Primary School, the distance is short. A run as far as Canterbury, under 15 miles away, is a very different job. So is any distance on the M20, under 15 miles from Eastry, where your engine has been running hard the whole time.
Knocking, a lumpy idle, smoke, a throttle gone soft: driven till it complained. What you are hearing is the engine reporting fuel that no longer runs like diesel. Whether it is the verge on High Street, a lay-by or a side street, stop where you are then leave it. What goes first is still the fuel drain and flush, and that deals with it, with lasting damage very uncommon when a vehicle is stopped soon.
What Eastry people get told about petrol in a diesel — and the myths in it
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Nothing comes out when you top up — that tank just holds more of the same blend. The assumption behind the advice — that diesel fuel systems accept petrol by percentage — is wrong.
If anything, the opposite holds. Myth: "A newer diesel can cope with a bit of petrol." A modern diesel sends its fuel through finer parts at higher pressure, which makes the lubrication matter more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there's no damage done." The driver of a petrol motor fed diesel normally has no choice but to stop, since it will not run, and the harm stops there. A diesel fed petrol usually starts, idles and drives away as if nothing has happened, whilst the pump grinds. Running does not mean fine.
An outdated fix for a distinct issue is behind this one. Myth: "Add some two-stroke oil and drive the car home." None of what petrol diluted gets put back by it — and later, your tank still contains the petrol.
"Drain it yourself and you are sorted" — a myth, since after it's been running some petrol lies in the fuel filter and lines, waiting to go straight back through the pump on the next start. Besides, petrol drained into a can by the road is truly hazardous.
Why petrol in a diesel happens at all
A careless moment is rarely the cause, and nobody means to do it. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle generally won't go into a petrol car at all. So the error runs one way.
The moment habit stops matching your car is the moment it occurs. A new vehicle, a hire car or a courtesy car. A household with one petrol and one diesel on the drive. A forecourt you know, but with its pumps laid out differently. A train to catch, and a rushed fill en route to Sandwich. The first fill-up in a diesel Renault Megane after years of driving petrol is precisely the moment it occurs. Throw in a back seat full of kids, a phone call or rain, and habit takes over.
Preventing petrol in a diesel next time you fill up around Eastry
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Read the pump's label; the colour is just a clue.
- Plenty of cars state the fuel type inside the filler flap or on the cap, and so check it on your first fill in a motor you don't know.
- One of each in the house? Mark your key to the diesel — a coloured fob, a sticker — because meaning to remember is not enough.
- It seems daft and it does the trick: on the 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, and so put the phone away then keep your mind on the pump.
- Add-on devices are available for cars without one, and some diesels come with a filler that will not accept a petrol nozzle. Helpful — but a safety net only, never a reason to stop checking the label.
- Less petrol means a thinner mixture, so stop the moment you realise — while remembering that your next stage is unchanged. It is still not to crank it.
Put petrol in a diesel in Eastry already?
The order of things is short, then. Leave it unstarted, with your ignition off too. Ask the attendants to help you push it clear of the petrol pump if you're still on the forecourt, whether that's Gulf or somewhere else. What went in, about how much, and if it's run: tell us that when you phone 0333 366 0103.
If it was AdBlue rather than petrol, say so. That is a different fault — corrosion and deposits rather than lost lubrication — and it has its own page for Eastry.
Eastry petrol in a diesel tasks: why one costs more than another
A fair single quote does not exist here: four situations, four separate tasks. Mostly, your cost moves with which situation you're in. Where the car is matters too, and whether our van can safely reach it, after the proportion of petrol to what your tank takes.
Three questions come first, before quoting, instead of after — what was put in, how much, has it run — and that is the reason. Given those answers, you get a straight figure rather than a range.
About Eastry
Eastry is a village in Kent, situated inland at an elevation of around 25 metres, approximately 10 miles from Canterbury and 64 miles from London. Eastry has a population of around 1466 people, predominantly living in detached houses. Eastry is close to nearby places such as Gore, Buttsole, and Selson, and remains a residential community with a rural character.
Fuel drain cover in Eastry and across Kent
Gore, Buttsole and Selson are among the spots around Eastry that the same vans work, answering petrol in diesel call-outs across Eastry's CT postcode area. The car doesn't need to come to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
At the pump around Eastry, right now?
Nothing beats it: that is where you are. Keep it off. Call.