How Worried Should You Be? Petrol in a Diesel Car in Bottesford
Unstarted? Then less worried than you probably are. Petrol resting in a diesel tank does nothing to the motor till something draws it through the fuel system — your ignition priming the pump, your starter, or the drive itself. So the truthful answer to the first question everyone around Bottesford asks, "have I ruined it?", is generally no. Petrol in Diesel is who to call, with the engine left off, so it stays that way. Read on for three things: the effect petrol has inside a diesel engine, the signs of how far it has spread, and ways to make sure you never do it again.
What petrol in a diesel does to the engine
Passing through a motor, diesel is doing two things at the same time. Lubricating comes before burning; it does both. Built to extremely fine tolerances, the injectors and the pump depend on your diesel moving through them to keep their surfaces from wearing against one another.
The second task petrol does not do at all, and the first it does poorly. The knocking comes from petrol being designed not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips out the protection the system rests on, and any pump working on such a mix is wearing itself.
Seen together, they make clear what shape the issue has. It's movement that causes the harm, not contact. All a tank with petrol in it amounts to is a fuel fault. The start of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds travels on with your fuel to your injectors downstream.
Bottesford, petrol in a diesel: four situations, from mild to significant
Filled but never started — as good as it gets. Being at a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With the petrol held in your tank alone, it is cleared and flushed on the spot, and nothing more is needed.
Started for a moment, or just the ignition on. Petrol has come out of the tank and got to the fuel filter and the lines, since your system has been bled. That is normally still an easy job — a drain, a flush, and your filter dealt with.
Your pump now worked a couple of miles on diluted fuel — that's what driving the car does. How hard the car was driven matters as much as how far, and the work takes in the tank, the lines, the fuel filter and clean fuel through the whole circuit. Driving the kids to Bottesford Church of England Primary School is one kind of trip. Very different once more: a trip to Nottingham, under 15 miles away, or some miles on the M1, under 25 miles from Bottesford, where the engine never stopped working hard.
Driven until it protested. Knocking, a lumpy idle, smoke, a throttle that has gone soft. The engine is telling you the fuel is no longer acting like diesel. Leave it wherever it stops: a lay-by, a quiet street, the verge on Albert Street. What goes first is still the drain and flush-through, and that takes care of it, with permanent damage very uncommon if a car is stopped early.
What Bottesford people get told about petrol in a diesel — and the myths in it
Myth: topping up to full with diesel makes it fine. It does not. Topping up removes nothing; it gives you a bigger tank of the same mixture. A diesel fuel system doesn't accept petrol by percentage in the way that advice assumes.
"Current diesels can handle a little petrol" — a myth, and nearer the reverse. At higher pressure, through more precise parts: that is how a current diesel handles its fuel, so the lubrication matters for more, not less.
"It starts, it drives, so there is no harm" — the myth that trips up most people than any other. Feed diesel to a petrol motor and it normally will not run, and so the driver stops — and the harm stops with them. A diesel fed petrol normally starts, ticks over and drives away as though nothing has happened, whilst your pump wears. A running engine doesn't mean fine.
Not so: a two-stroke additive makes it safe to drive home. It was an old workaround, supposed for another issue. None of what petrol thinned gets put back by it — and afterwards, the tank still contains the petrol.
Myth: "Drain your tank yourself and you're sorted." Once your engine has been run, some of that petrol is no longer inside that tank: it is in the filter and the lines, and it goes right back through your pump on your next start. Clearing petrol into a can by the roadside is also truly dangerous.
How does petrol in a diesel happen?
No one does it on purpose, and it's seldom carelessness. The forecourt makes it easy: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle mostly will not go into a petrol car at all. So the error runs one way.
The moment habit stops matching the vehicle is the moment it occurs. Any car that is new to you — hired, on loan as a courtesy car, or brand new. A household with one petrol and one diesel on the drive. A well-known forecourt with the pumps in a different order. Fuelling up in a rush en route to the nearest station, with a train to catch. Exactly the moment it takes place: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. Add rain, a phone call or a back seat full of kids, and your hand does what it has always done.
How to prevent petrol in a diesel on your next fill-up around Bottesford
- The label is what matters, so check the petrol pump rather than the colour: in the UK unleaded handles are usually green and diesel black, yet not on every forecourt.
- The first fill in an unfamiliar motor is the time to check your filler flap — on it, or on the cap, plenty of cars state which fuel they take.
- A coloured fob or a sticker on your diesel's key does more than any amount of intending to remember, for a household with one of each.
- "Diesel", out loud, before you lift the nozzle — every time a new or hired car needs its first tank. It seems daft. It does the trick.
- Thinking about something else is when this becomes an easy mistake to make, so put your phone away and keep your mind on the petrol pump.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler built to block a petrol nozzle, and add-on devices exist for vehicles without one. They are a backstop, not a reason to stop reading the pump.
- As soon as you realise, stop: less petrol inside that tank makes a thinner blend. What to do next does not change, though — still don't start the vehicle.
Petrol already in a diesel around Bottesford? Begin here
Then the order of things is short. Don't crank it, and do not turn the ignition on. If you're still on the forecourt — JET or anywhere else — ask the attendants to help you push the vehicle away from the petrol pump. Then ring 0333 366 0103 and tell us what got in, about how much, and if it's run.
If it was AdBlue and not petrol, say so. That is a different fault — corrosion and deposits rather than lost lubrication — and it has its own page for Bottesford.
Why one petrol in a diesel task in Bottesford costs more than another
The four scenarios above are four different jobs, so no single quote for this would be fair. Mostly, the cost shifts with which one you are in. The proportion matters next, meaning how much of that tank is petrol, and then the location of your car and whether reaching it is safe for a van.
What was put in, how much, and if it's run — three queries our technicians ask before quoting, not after, for exactly that reason. Given the answers, there is a straight figure instead of a range.
About Bottesford, briefly
Bottesford is a village in Leicestershire, situated on the banks of the River Devon, with a low elevation of around 32 metres. Bottesford lies near several smaller settlements, including Easthorpe, Normanton, and Muston, and is located approximately 14 miles from Nottingham. Bottesford has a population of around 2213 people, predominantly living in detached houses. Bottesford is also within commuting distance of larger cities, being around 103 miles from London.
Fuel drain cover across Leicestershire, Bottesford included
Easthorpe, Normanton and Muston are among the places near Bottesford that the same teams work, answering petrol in diesel jobs across Bottesford's NG postcode area. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations our engineers work, and your vehicle doesn't need to move to us.
At the pump around Bottesford, right now?
Then, you could not be in a better place. Keep it off. Ring.