Petrol in a Diesel Car in Windmill Hill: How Worried Should You Be?
Not started? Then less worried than you probably feel. Everyone in Windmill Hill starts with "have I wrecked it?", and the honest answer is normally no: petrol left inside your tank of any diesel remains harmless until priming, cranking or driving draws it into the system. Petrol in Diesel is who to phone, with your engine left off, and so it remains that way. Further down, you will find what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you a second time.
Petrol in a diesel: what does it do to your engine?
On its way through an engine, diesel has two tasks. It lubricates first, and after that does it burn. What stops the surfaces inside the high-pressure fuel pump and the fuel injectors from wearing down against one another is the diesel flowing through them — they are made to very fine gaps.
Badly at the first, not at all at the second: that is petrol. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump on the blend wearing itself. It's also made to resist igniting under compression — the opposite of what a diesel needs — which is where you get the clattering.
The shape of the trouble is clear when you put those together. Contact doesn't do the damage — movement does. Any tank with petrol in it is a fuel fault. Once your pump has been running on that petrol, a mechanical fault has started: whatever is shed by a pump that is grinding travels onward to your injectors with your fuel.
Petrol in a diesel around Windmill Hill: how serious is it? Four situations
Fuelled up, never started. The best case there can be. The petrol is in the tank and only your tank, and the task is a drain and a flush where the vehicle stands. This is the one situation that can only truly take place at a forecourt, because anywhere else the car has been driven to get there.
Started for a moment, or only your ignition on. With the system primed, your lines and filter already contain petrol that came from your tank. Normally nothing more than draining, rinsing and seeing to the fuel filter, so still straightforward.
Your pump now worked a few miles on weakened fuel — that's what driving it meant. How hard the vehicle was driven counts as much as how far, and this work takes in your tank, your lines, the fuel filter and fresh fuel through the whole system. Short trips, like the school run to Holy Trinity Church of England Primary School, are one thing. Very different again: a trip to Southend-on-Sea, under 25 miles away, or any distance on the M2, under 5 miles from Windmill Hill, where the motor never stopped working hard.
It complained, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone uneven. That's the engine telling you its fuel no longer is acting like diesel. Whether it is the verge on Leith Park Road, a lay-by or a side street, stop there and leave it. What goes first is still the fuel drain and flush-through, and that takes care of it, with long-term damage very unusual if a car is pulled over quickly.
Petrol in a diesel stories Windmill Hill people hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing is removed by topping up — you are left with a fuller tank, still the same mix. A diesel fuel system doesn't tolerate petrol by percentage in the way that advice presumes.
Not so: a newer diesel copes with a bit of petrol. Rather, the reverse. At higher pressure, through more precise parts: that's how a current diesel moves its fuel, and so the protection matters more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that fools people. Any petrol motor fed diesel generally will not run, and so the driver stops and the harm stops with them. Feed petrol to a diesel and it generally starts, idles and drives away as if nothing happened — all the while its pump is wearing. A running engine does not mean fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate issue. What petrol has thinned stays thinned, and that petrol remains inside that tank regardless.
Once the motor has run, part of the petrol sits in the fuel filter and the lines, not your tank — and the next start pulls it straight back through your pump. So the myth "drain that tank yourself and you're sorted" doesn't hold. It's also truly hazardous to drain petrol into a can at the kerbside.
How petrol ends up: petrol in a diesel
No one does it on purpose, and it's seldom carelessness. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol motor at all. The forecourt makes it simple, and the mistake runs one way.
It occurs when routine and the vehicle stop matching. A motor that's new to you — a hire car, on loan as a courtesy car, or brand new. One petrol and one diesel on the drive of the same household. The pumps in a different order on a familiar forecourt. A hurried fill en route to Gravesend with a train to catch. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you at the forecourt for its first tank — that is when. Throw in a back seat full of kids, a phone call or rain, and habit takes over.
How to avoid petrol in a diesel at your next fill-up around Windmill Hill
- The label is what matters, so check the pump rather than the colour: in the UK unleaded handles are usually green and diesel black, but not on every forecourt.
- Many cars state the fuel inside your filler flap or on the cap, so check there on your first fill in a motor you do not know.
- Label your 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 meaning to remember.
- "Diesel", aloud, before you lift the nozzle — each time a new or hired car needs its first tank. It seems silly. It works.
- Whilst you are thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Some diesels come with a filler designed to reject a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the petrol pump.
- As soon as you notice, stop: less petrol inside that tank makes a thinner mixture. What to do next does not change, though — still don't fire it up.
Put petrol in a diesel in Windmill Hill already?
The order of things is short, then. Starting it is out, and so is turning on the ignition. If you're still at the forecourt — Esso or anywhere else — ask the attendants to help you roll the vehicle away from the pump. What went in, roughly how much, and if it's run: tell us those when you ring 0333 366 0103.
Say so if it was AdBlue rather than petrol: it is a different problem, with its own page for Windmill Hill, since AdBlue brings corrosion and deposits rather than lost lubrication.
What makes one Windmill Hill petrol in a diesel task cost more than the next
There is no honest single quote for this, since the four situations above are four different jobs. What moves your cost is chiefly which of them you are in. The ratio matters next, meaning how much of your tank is petrol, followed by the location of the vehicle and whether reaching it is safe for a van.
That's why we ask three queries before costing rather than after: what was put in, how much, and whether it's run. Those replies are what turn a range into one firm number.
About Windmill Hill itself
Windmill Hill is a suburban area in Kent, situated near the coast and approximately 22 miles from London. Windmill Hill has a mix of housing types, but is predominantly characterized by terraced homes. Windmill Hill is close to several nearby places, including Westcourt, Milton, and Gravesend, and is about 16 miles from the city of Southend-on-Sea. Windmill Hill sits at an elevation of around 38 metres above sea level.
Fuel drain cover across Kent, Windmill Hill included
Westcourt, Milton and Gravesend are among the places near Windmill Hill that the same teams work, answering petrol in diesel calls across Windmill Hill's DA postcode area. 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 pump in Windmill Hill?
Then you are in the best spot there can be. Keep it off. Call.