How Worried Should You Be? Petrol in a Diesel Car in Rudheath
Far less than you probably are, if it has not been started. Until the ignition primes your pump, the starter cranks, or the car is driven, petrol in a diesel tank simply rests there and does nothing. Which means the truthful reply to the first Rudheath question — "have I wrecked it?" — usually no. To leave the car that way, phone Petrol in Diesel then leave the motor alone. Read on for three things: the effect petrol has inside a diesel engine, the signs of how far it has got, and the way to make sure you never repeat it.
The engine and petrol in a diesel: what goes on
On its way through an engine, diesel does two tasks. Lubricating comes before burning; it does both. Made to extremely fine clearances, the fuel injectors and the pump rely on your diesel moving through them to stop their surfaces wearing against one another.
The second job petrol doesn't do at all, and the first it does poorly. Being less viscous than diesel, petrol strips out the protection a fuel system needs, leaving a pump on the mixture wearing itself. It's also made to resist igniting under compression — the opposite of what a diesel needs — which is why you get the knocking.
The shape of the problem is plain when you put those together. It is movement that causes the damage, not contact. All a tank with petrol in it amounts to is a fuel problem. The beginning of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds moves on with the fuel to the injectors downstream.
Rudheath, petrol in a diesel: four cases, from mild to significant
Filled but not once started — the best it gets. Only the tank has petrol in it, and so the job is emptying your tank and rinsing the fuel system where the vehicle stands. This scenario can only really occur at a forecourt: anywhere else, the vehicle got there by being driven.
Started for a moment, or just the ignition on. With the fuel system primed, the lines and filter now hold petrol that has come from your tank. Still normally simple: drain, flush, and the fuel filter dealt with.
Those few miles on the road meant your pump labouring on fuel diluted by petrol throughout. The work is that tank, the fuel lines, the fuel filter and clean fuel through the whole circuit, and how hard your car was driven matters as much as how far. A school run to Rudheath Primary Academy and Nursery is one thing. A run as far as Chester, under 25 miles away, is a very different task. So is any distance on the M6, under 5 miles from Rudheath, where the motor has been running hard the whole time.
Driven on till it complained — rattling, smoke, a ragged idle, a soft throttle. What you are hearing is the engine reporting fuel that no longer runs like diesel. Leave it where it stops: a lay-by, a quiet street, the verge on Gadbrook Road. Permanent damage is very rare if a vehicle is pulled over quickly, and the fuel drain and flush that still go first deal with it.
Rudheath people and that petrol in a diesel stories they hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing comes out when you top up — that tank just holds more of the same mixture. That guidance presumes a diesel fuel system handles petrol by percentage. It does not.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the reverse. At higher pressure, through smaller components: that is how a current diesel handles its fuel, so the lubrication matters for more, not less.
This is the one that catches motorists. Myth: "If it starts and drives, there's no harm done." Any petrol motor fed diesel usually won't run, and so the driver stops and the harm stops with them. Feed petrol to a diesel and it normally fires up, ticks over and pulls away like nothing has happened — all the while its pump is wearing. Being able to run is not the same as being fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct issue. What petrol has thinned remains diluted, and the petrol stays in your tank anyway.
Once the engine has been run, part of that petrol sits in the fuel filter and your lines, not your tank — and the next start pulls it straight back through the pump. So the myth "drain the tank yourself and you're sorted" doesn't stand up. It is also truly risky to drain petrol into a can at the kerbside.
How does petrol in a diesel take place?
No one does it on purpose, and it is rarely carelessness. The petrol nozzle is the smaller of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol car at all. The forecourt makes it simple, and the slip runs one way.
The moment habit stops matching the vehicle is the moment it occurs. A new car, a hire car or a courtesy car. Two cars on one drive, one petrol, one diesel. The pumps in a different order on a familiar forecourt. Fuelling up in a hurry en route to Northwich, with a train to catch. The first fill-up in a diesel Skoda Octavia after years of driving petrol is precisely the moment it occurs. With rain, a call arriving, or children to deal with, the hand simply does what it has always done.
Preventing petrol in a diesel next time you fill up around Rudheath
- The label is what matters, so read the petrol pump rather than the colour: in the UK unleaded handles are normally green and diesel black, but not on each forecourt.
- Many cars state the fuel inside the filler flap or on the cap, so check there on your first fill in any car you don't know.
- One of each in the house? Label your key to your diesel — a coloured fob, a sticker — since intending to remember isn't enough.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump. It seems silly and it works.
- Put the phone away. This is an easy mistake to make whilst you're thinking about something else.
- Some diesels have a filler built to block a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the petrol pump.
- Less petrol makes a weaker mixture, so stop as soon as you realise — though remembering that your next stage is unchanged. It is still not to fire it up.
Put petrol in a diesel in Rudheath already?
Then, there's just a short order of things. Starting it is out, and so is switching on your ignition. Ask the attendants to help you roll it clear of the petrol pump if you're still on the forecourt, whether that is Texaco or somewhere else. Then call 0333 366 0103 and tell us what got in, about how much, and if it's run.
If it was AdBlue rather than petrol, say so. That's a different problem — corrosion and deposits and not lost protection — and it has its own page for Rudheath.
What makes one Rudheath petrol in a diesel task cost more than the next
A fair single quote doesn't exist here: four scenarios, four separate jobs. Chiefly, the cost shifts with which one you are in. The ratio matters next, meaning how much of your tank is petrol, followed by the location of your car and whether getting to it is safe for our van.
That is why our technicians ask three queries before quoting rather than after: what got in, how much, and whether it has run. A range becomes a straight figure once those answers are in.
About Rudheath, for a moment
Rudheath is a village in Cheshire, situated on the riverside at a low elevation of around 25 metres. Rudheath lies near the city of Chester, approximately 17 miles to the south west, and is surrounded by smaller settlements like Higher Shurlach and Leftwich. Rudheath has a population of around 3542 people, predominantly living in semi-detached housing. Rudheath is located in the North West region of England, about 156 miles from London.
Rudheath and Cheshire: where our fuel drain cover runs
Rudheath waits in the CW postcode area, and our teams that answer petrol in diesel jobs there work the locations near it as well — Higher Shurlach, Broken Cross and Leftwich among them. The vehicle does not need to come to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the pump in Rudheath?
Then you are in the best place there is. Ring, and keep it turned off.