Hale Bank: Petrol in a Diesel Car? How Worried to Be
If it has not been started, worry far less than you probably are. Everyone around Hale Bank starts with "have I wrecked it?", and the honest answer is usually no: petrol left in the tank of any diesel remains harmless till priming, cranking or driving draws it into your fuel system. To keep the vehicle that way, phone Petrol in Diesel then leave your motor switched off. Further down, you will find what petrol actually does inside a diesel, how far it may have gone, and how to stop it happening to you again.
What petrol in a diesel does to the engine
Diesel does two jobs on its way through an engine. Oiling comes before burning; it does both. The high-pressure fuel pump and the injectors are designed to extremely fine clearances, and your diesel passing through them is what keeps those surfaces from grinding against one another.
The second job petrol doesn't do at all, and the first it does badly. Being less viscous than diesel, petrol strips away the protection a fuel system needs, leaving a pump on the mixture to wear itself. It's equally made to resist igniting under compression — the reverse of what a diesel needs — which is why you get the clattering.
The shape of the problem is plain once you put those together. The harm is done by movement, not by contact. Where that petrol is only in the tank, it is an issue of fuel, nothing more. Whatever a worn pump sheds travels on, borne by your fuel, into your injectors further along, which is why a pump that has been working on that petrol is where a mechanical problem begins.
Four situations our engineers see in Hale Bank: how bad is petrol in a diesel?
Fuelled but not once started — as good as it gets. Just that tank has petrol in it, so the task is emptying the tank and flushing your system where your car sits. This situation can only truly occur at a forecourt: anywhere else, your car got there by being driven.
A moment's running, or just the ignition on. Petrol has left the tank and got to the filter and the fuel lines, because your system has been primed. Usually nothing more than clearing, rinsing and seeing to the filter, so still simple.
Some miles driven, and your pump has spent each of them working on diluted fuel. The work is your tank, the fuel lines, the fuel filter and fresh fuel through the whole circuit, and how hard your car was driven matters as much as how far. A school run to Halebank CofE Primary School is one matter. Very different again: a trip to Liverpool, under 10 miles away, or some mileage on the M57, under 5 miles from Hale Bank, where your engine kept working hard.
Knocking, an uneven idle, smoke, a throttle gone soft: driven till it complained. That's the engine telling you its fuel has stopped behaving like diesel. Stop wherever you are — the verge on Hale Road, a lay-by, a side street — and leave the car there. What goes first is still the fuel drain and flush, and that takes care of it, with long-term damage very rare if a vehicle is stopped quickly.
Hale Bank people and the petrol in a diesel myths they hear
False: topping up to full with diesel makes it fine. It doesn't. Topping up takes out nothing; it gives you a fuller tank of the same mix. A diesel fuel system does not tolerate petrol by percentage in the way that advice presumes.
Not so: a modern diesel copes with a bit of petrol. Rather, the reverse. A modern diesel sends its fuel through smaller parts at higher pressure, which makes the lubrication count more, not less.
"It starts, it drives, so no harm done" — the myth that trips up most people than any other. Feed diesel to a petrol engine and it generally won't run, so the driver stops — and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile your pump wears. Being able to run isn't proof of being fine.
Myth: a two-stroke additive makes it safe to drive home. It is an old fix, supposed for another fault. None of what petrol diluted gets put back by it — and afterwards, that tank still contains that petrol.
Once your engine has run, part of the petrol is in the fuel filter and the lines, not that tank — and your next start sends it straight back through your pump. So the myth "drain the tank yourself and you're sorted" does not stand up. Emptying petrol into a can at the roadside is also really hazardous.
How it happens: petrol in a diesel
No one does it on purpose, and it's rarely carelessness. The petrol nozzle is the narrower of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol vehicle at all. The forecourt makes it simple, and the slip runs one way.
The moment habit stops matching your car is the moment it takes place. Courtesy car, hire car, or a motor that's new. Two motors on one driveway, one petrol, one diesel. A well-known forecourt with the pumps in a different order. A train to catch, and a rushed fill en route to Hough Green. Exactly the moment it happens: after years of driving petrol, a driver fills a diesel Renault Megane for the first time. Add rain, a phone call or a back seat full of kids, and the hand repeats what it has always done.
Hale Bank people: how to avoid petrol in a diesel next time
- Green for unleaded and black for diesel is normal in the UK — yet not on each forecourt. Trust the label on the pump, not the colour.
- The first fill in a strange vehicle is the time to check your filler flap — on it, or on the cap, plenty of motors state which fuel to use.
- One of each in the home? Mark the key to the diesel — a coloured fob, a sticker — because meaning to remember is not enough.
- It sounds daft and it works: on your first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the petrol pump.
- Mistakes like this are easy to make whilst your mind is on something else, and so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to block a petrol nozzle, and add-on devices exist for the remainder. Count it as a safety net, then keep checking the pump.
- Less petrol makes a thinner mixture, so stop as soon as you notice — while remembering that your next stage is unchanged. It is still not to start the vehicle.
Hale Bank: already put petrol in a diesel?
Then the order of things is short. Starting it is out, and so is turning on your ignition. If you're still on the forecourt — Gulf or anywhere else — ask the attendants to help you roll the car away from the pump. Next, 0333 366 0103. We will ask what was put in, roughly how much, and if it's been run.
If it was AdBlue instead of petrol, say so. That's a separate problem — corrosion and deposits and not lost lubrication — and it has its own page for Hale Bank.
Why one petrol in a diesel job around Hale Bank costs more than another
The four scenarios above are four different jobs, so no single quote for this would be fair. Chiefly, your cost moves with which one you are in. Where the vehicle is matters too, and whether a technician can safely reach it, after the proportion of petrol to what your tank holds.
What went in, how much, and whether it has run — three questions our engineers ask before quoting, not after, for exactly that reason. Their replies are what turn a range into one firm number.
About Hale Bank, for a moment
Hale Bank is a small village in Cheshire, situated near the coast and approximately 9 miles from Liverpool. Hale Bank has a relatively low elevation of 12 metres and is close to nearby places such as West Bank Dock Estate and Ditton. Hale Bank is characterized by its predominantly semi-detached housing stock, reflecting the typical residential development of the area.
Across Cheshire and around Hale Bank: fuel drain cover
Our vans answering petrol in diesel jobs in Hale Bank, in the WA postcode area, equally work the places around it, West Bank Dock Estate, Hough Green and Ditton included. We drain wherever the car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Still at the petrol pump around Hale Bank?
In that case, you could not be in a better spot. Leave it turned off, then ring.