Petrol in a Diesel Car in Thick Hollins: How Worried Should You Be?
Likely less than you already are — as long as no one has started the car. Everyone in Thick Hollins begins with "have I ruined it?", and the honest answer is generally no: petrol resting inside your tank of a diesel stays harmless until priming, cranking or driving pulls it into the fuel system. Leave your motor off and ring Petrol in Diesel — that is how you keep it like that. Further down, you will find what petrol really does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
The engine and petrol in a diesel: what goes on
Diesel does two tasks on its way through an engine. It ignites, and before it ignites it lubricates. Your high-pressure pump and the fuel injectors are designed to very fine clearances, and the diesel passing through them is what stops those surfaces from wearing down against one another.
Of those two jobs, petrol manages the first poorly and the second not at all. A pump running on a petrol mix is wearing itself out, because petrol is thinner than diesel and takes away the lubrication the fuel system relies on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that's where the knocking comes.
The shape of the trouble is plain once you put those together. The harm is done by circulation, not by contact. Any tank with petrol in it is a fuel issue. A pump that has been working on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the fuel injectors downstream.
Petrol in a diesel around Thick Hollins: how bad is it? Four cases
Fuelled up, not once started. The best case there can be. That petrol is in that tank and just your tank, and the job is a drain and a flush where the vehicle sits. This is the one situation that can only truly happen at a forecourt, as anywhere else the car has been driven to get there.
A brief spell of running, or just the ignition on. Once primed, the fuel system has pulled petrol from your tank up to your filter and your lines. Drain, flush, see to the fuel filter: still normally easy.
Your pump now spent a couple of miles on thinned fuel — that's what driving the vehicle meant. How hard the car was driven counts as much as how far, and the work takes in that tank, your lines, the fuel filter and fresh fuel through the entire circuit. On the school run to Meltham CofE (VC) Primary School, the distance is small. A run as far as Bradford, under 15 miles away, is a very different job. So is any distance on the M62, under 5 miles from Thick Hollins, where the engine has been working hard throughout.
Knocking, a ragged idle, smoke, a throttle gone soft: driven until it complained. The fuel is not behaving like diesel any more, and the motor is saying so. Stop wherever you are — the verge on The Grove, a lay-by, a side street — and leave it where it is. The fuel drain and flush-through still go first, and they take care of it: when a vehicle is pulled over soon, permanent damage is very rare.
Petrol in a diesel myths Thick Hollins people hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Topping up takes out nothing; it gives you a fuller tank of the same mixture. Percentage isn't how a diesel fuel system copes with petrol, however much that guidance supposes.
If anything, the reverse is true. Myth: "A newer diesel can cope with a bit of petrol." Protection matters more on modern diesels, not less, since their fuel passes through smaller parts at higher pressure.
The myth that catches motorists off guard: if it starts and drives, it must be unharmed. The motorist of a petrol motor fed diesel usually stops, since it will not run, and the harm stops there. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile your pump wears. Fine and running aren't the same at all.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a separate issue. None of what petrol diluted gets put back by it — and afterwards, that tank still contains that petrol.
"Drain it yourself and you're sorted" — a myth, because after it's been running some petrol lies in the fuel filter and lines, waiting to go straight back through your pump on the next start. And, a can of petrol drained by the roadside is genuinely risky.
How does petrol in a diesel happen?
On purpose? Never. Through carelessness? Seldom, if ever. A diesel nozzle generally will not fit a petrol motor, but the smaller petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake easy, and just in one direction.
Routine and your car getting out of step is how it occurs. Courtesy car, hire car, or a car that is new. One petrol and one diesel on the driveway of the same household. A familiar forecourt with the pumps in a different order. A hurried fill on the way to Honley with a train to catch. A new-to-you diesel Renault Megane, its first fuelling, and a driver used to petrol: precisely when it takes place. Add rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
Next time you fill up in Thick Hollins: avoiding petrol in a diesel
- The label is what matters, so check the petrol pump instead of the colour: in the UK unleaded handles are normally green and diesel black, yet not on each forecourt.
- In a vehicle you do not know, look inside the flap over your filler or at the cap before the first fill: plenty of vehicles print the fuel type there.
- Mark the key. In a household with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- "Diesel", out loud, before you pick up the nozzle — each time a new or hired car needs its first tank. It sounds daft. It works.
- Whilst you are thinking about something else, this is an easy mistake to make — so put your phone away.
- Some diesels come with a filler built to block a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the petrol pump.
- Spotting it halfway? Stop at once. A weaker blend follows from less petrol in the tank, yet your next stage remains the same: don't fire it up.
Thick Hollins: already put petrol in a diesel?
The order of things is short, then. Never start the vehicle, and do not switch the ignition on. Yet at the forecourt, at Morrisons or anywhere else? Ask the staff to help you push it away from the petrol pump. Next, 0333 366 0103. We will ask what got in, roughly how much, and if it's been run.
If it was AdBlue rather than petrol, say so. That is a separate fault — corrosion and deposits rather than lost protection — and it has its own page for Thick Hollins.
Why one petrol in a diesel job around Thick Hollins costs more than another
There's no honest single price for this, because the four situations above are four separate tasks. Which of them you are in is mostly what shifts the cost. Two things come after that: the petrol that got in as a share of what the tank holds, then the spot the vehicle is in and whether a technician can reach it safely.
What got in, how much, and whether it has run — three questions we ask before pricing, not after, for precisely that reason. Those replies change a range into a straight figure.
About Thick Hollins and its setting
Thick Hollins is a suburban area situated near the River Holme in West Yorkshire, with an elevation of around 201 metres. Thick Hollins lies close to the towns of Meltham and Meltham Mills, and is characterised by its predominantly detached housing stock. Thick Hollins is located approximately 14 miles from Bradford, and is part of the wider West Yorkshire urban landscape. Thick Hollins has a population of around 2759 residents.
Across West Yorkshire and in Thick Hollins: fuel drain cover
Petrol in diesel jobs around Thick Hollins — part of the HD postcode area — go to teams that also cover the locations about it, Meltham Mills, Mill Stables and Meltham included. Our engineers drain where your car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the pump around Thick Hollins?
Nothing beats it: that's where you are. Leave the car switched off, and ring.