How Worried Should You Be? Petrol in a Diesel Car in Fenny Drayton
Not started? Then less worried than you probably feel. Everyone in Fenny Drayton starts with "have I wrecked it?", and the honest answer is normally no: petrol left inside that tank of any diesel remains harmless until priming, cranking or driving draws it into your fuel system. To leave the car like that, phone Petrol in Diesel and leave the motor alone. What petrol really does to a diesel, how to judge how far it has gone, and how to stop it from happening again: that is the rest of this page.
Inside the engine: what petrol in a diesel does
On its way through a motor, diesel does two tasks. Before it ignites, it protects — and then it combusts. What stops the surfaces inside the high-pressure fuel pump and your injectors from wearing down against each other is the diesel passing through them — they're made to very fine gaps.
Poorly at the first, not at all at the second: that is petrol. A pump running on a petrol mixture is wearing itself out, because petrol is thinner than diesel and strips out the lubrication the fuel system depends on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that's where the clattering starts.
Taken together, they make clear what shape the issue takes. The damage is done by movement, not by contact. Petrol in a tank is a fuel problem. After the pump has been labouring on that petrol, a mechanical issue has started: anything shed by a pump that's grinding is carried downstream to the fuel injectors with the fuel.
How bad is petrol in a diesel? Four scenarios our engineers see around Fenny Drayton
Filled up, and not started: no case is better. That petrol is inside your tank and only the tank, and the task is a drain and a flush where the car stands. This is the one situation that can only really happen at a forecourt, since anywhere else the vehicle has been driven to get there.
A brief spell of running, or just your ignition on. Your system has been primed, and so petrol has left that tank and reached the filter and the fuel lines. Drain, flush, see to the filter: still usually easy.
Driven a couple of miles. Now your pump has spent those miles labouring on weakened fuel. Distance is only half of that; how hard it was driven matters equally. Either way this work includes your tank, the fuel lines, the fuel filter and fresh fuel through the whole system. Short trips, such as the school run to Witherley Church of England Primary School, are one matter. A run as far as Coventry, under 15 miles away, is a very different job. So is any distance on the M69, under 10 miles from Fenny Drayton, where the engine has been running hard the whole time.
Rattling, an uneven idle, smoke, a throttle gone soft: driven until it complained. That is your motor telling you its fuel has stopped behaving like diesel. Whether it's the verge on Drayton Lane, a lay-by or a side street, stop where you are then leave it. Permanent damage is very rare when a car is pulled over quickly, and the drain and flush-through that still come first sort it out.
Petrol in a diesel stories Fenny Drayton people hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Topping up removes nothing; it gives you a bigger tank of the same mix. That advice assumes a diesel fuel system tolerates petrol by percentage. It does not.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the reverse. A newer diesel runs its fuel through finer parts at higher pressure, which makes the protection count more, not less.
One myth that catches people out: if it starts and drives, it must be unharmed. Any petrol motor fed diesel normally won't run, and so the driver stops and the harm stops with them. Whilst your pump grinds, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Fine and running aren't the same at all.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an outdated workaround for a distinct problem. None of what petrol diluted is put back by it — and afterwards, your tank still contains that petrol.
Myth: "Drain the tank yourself and you're sorted." Once the engine has been run, some of the petrol is no longer inside the tank: it's in your filter and your lines, and it goes straight back through the pump on the next start. Draining petrol into a can at the roadside is also genuinely risky.
How does petrol in a diesel happen?
Nobody does it on purpose, and it is seldom carelessness. One way only, since of the nozzles: the narrower petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol vehicle. That is how the forecourt makes it straightforward.
When routine and your car stop matching, it happens. A new motor, a hire car or a courtesy car. Two motors on one drive, one petrol, one diesel. The pumps in a different order on a familiar forecourt. A hurried fill en route to Atherstone with a train to catch. Exactly the moment it occurs: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. Add a back seat full of kids, a phone call or rain, and the hand wins.
Next time you fill up around Fenny Drayton: avoiding petrol in a diesel
- Read the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on each forecourt. The label is what counts.
- In a vehicle you do not know, look inside the flap over your filler or at the cap before your first fill: many motors print the fuel there.
- Good intentions do less than a sticker or a fob in a vivid colour on your diesel's key when a household has one of each. So mark it.
- "Diesel", aloud, before you lift the nozzle — each time a new or hired car gets its first tank. It seems daft. It does the trick.
- Tuck the phone away. This is an easy mistake to make while you are thinking about something else.
- Add-on devices are available for cars without one, and some diesels are built with a filler that will not take a petrol nozzle. Useful — but a safety net only, never a reason to stop checking the label.
- Stop the moment you realise. Less petrol in that tank means a weaker mixture. It does not change what to do next, which is still not to crank it.
Already put petrol in a diesel around Fenny Drayton?
The order of things is brief, then. Starting it is out, and so is turning on your ignition. Still at the forecourt, at Nitrogen Station or anywhere else? Ask the staff to help you roll the vehicle away from the petrol pump. Then phone 0333 366 0103 and tell us what went in, roughly how much, and whether it has run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate fault — Fenny Drayton has a page all for it.
One petrol in a diesel job in Fenny Drayton costs more than another. Why?
The four situations above are four separate tasks, so no single quote for this would be honest. Chiefly, your cost shifts with which situation you are in. After that it is the share — how much petrol was put in against how much your tank holds — and after that where the vehicle is and whether a van can get to it safely.
Three questions come first, before quoting, rather than after — what got in, how much, has it run — and this is the reason. A range becomes a straight figure once the replies are in.
About Fenny Drayton itself
Fenny Drayton is a small village in Leicestershire, situated in the East Midlands region of England, with a population of around 527 people. Fenny Drayton lies approximately 89 metres above sea level, near the villages of Atterton, Caldecote, and Witherley. Fenny Drayton is characterized by its predominantly detached housing stock, reflecting its rural setting. Fenny Drayton is located about 11 miles from Coventry and 93 miles from London.
Fuel drain cover around Fenny Drayton and across Leicestershire
Atterton, Caldecote and Witherley are among the spots near Fenny Drayton that the same teams work, answering petrol in diesel call-outs across Fenny Drayton's CV postcode area. A forecourt, a supermarket car park, a lay-by or your own driveway are all places our technicians drain, and your vehicle does not need to move to us.
At the petrol pump in Fenny Drayton, still?
Then you're in the best spot there can be. Leave the car turned off, then ring.