Killinghall Moor: Petrol in a Diesel Car? How Worried to Be
Far less than you probably are, provided it hasn't been started. Until the ignition primes your pump, your starter cranks, or the vehicle is driven, petrol in a diesel tank simply waits there and does nothing. Which makes the honest reply to that first Killinghall Moor query — "have I ruined it?" — normally no. Petrol in Diesel is who to phone, with the motor left off, and so it stays that way. The remainder of this page covers what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you again.
Petrol in a diesel: what does it do to the motor?
Two jobs fall to diesel on its route round a motor. It lubricates first, and after that does it burn. Designed to very fine gaps, your injectors and the pump rely on the diesel moving through them to stop their surfaces wearing against one another.
Of these two tasks, petrol handles the first poorly and the second not at all. Being less viscous than diesel, petrol strips away the protection a fuel system needs, so a pump running on that mixture to wear itself. It's also made to resist igniting under compression — the opposite of what a diesel needs — which is where you get the rattling.
Put these together and the shape of the problem is plain. It's movement that causes the harm, not contact. Where the petrol is only in your tank, it is a fault of fuel, nothing more. The start of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with your fuel to the injectors downstream.
Killinghall Moor, petrol in a diesel: four cases, from mild to significant
Fuelled, and never started: no case is better. On a forecourt, and truly only there, that petrol is still limited to the tank — because everywhere else the vehicle was driven to reach it. The task is draining and purging on the spot.
Ignition on, or started for a second. With the fuel system primed, the fuel lines and filter already hold petrol that came from your tank. Usually nothing more than draining, flushing and seeing to the fuel filter, and so still straightforward.
A few miles driven, and the pump has spent each of them labouring on diluted fuel. Miles is only half of that; how hard it was driven matters equally. Either way the work runs to that tank, your lines, your filter and fresh fuel through the entire circuit. Short trips, like the school run to Saltergate Junior School, are one matter. Getting as far as Ripon, under 10 miles away, makes a very different job — as does any mileage on the A1(M), under 10 miles from Killinghall Moor, with the motor running hard the whole time.
Driven on until it protested — knocking, smoke, a ragged idle, a soft throttle. The motor is telling you your fuel is no longer behaving like diesel. Leave it where it has stopped: a lay-by, a side street, the verge on Campion Grove. Long-term damage is very unusual if a vehicle is pulled over soon, and the drain and flush-through that still come first deal with it.
What Killinghall Moor people get told about petrol in a diesel — and the stories in it
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing comes out when you top up — the tank simply holds more of the same blend. A diesel fuel system does not tolerate petrol by percentage in the way that advice assumes.
"Newer diesels can handle a little petrol" — a myth, and closer to the reverse. At higher pressure, through finer parts: that is how a current diesel moves its fuel, so the lubrication matters more, not less.
One myth that catches drivers off guard: if it starts and drives, it must be unharmed. Any petrol motor fed diesel normally won't run, and so the motorist stops and the harm stops with them. While your pump grinds, a diesel fed petrol usually starts, idles and drives away as though nothing has happened. Running isn't the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct fault. What petrol has diluted remains diluted, and that petrol stays in the tank anyway.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol lies in the fuel filter and lines, waiting to go right back through the pump at the next start. Draining petrol into a can at the kerbside is also really risky.
How petrol ends up: petrol in a diesel
A careless moment is seldom the cause, and nobody means to do it. A diesel nozzle generally will not go into a petrol car, 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 when it occurs. Hire cars, courtesy cars, and motors that are new to you. Households running one of each, petrol and diesel. The pumps in a different order on a familiar forecourt. A train to catch, and a hurried fill on the way to Harrogate. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that's when. With rain, a call coming in, or children to deal with, your hand simply does what it has always done.
Next time you fill up around Killinghall Moor: preventing petrol in a diesel
- Check the pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on each forecourt. The label is what counts.
- In a motor you do not know, look inside the flap over your filler or at the cap before your first fill: plenty of motors print the fuel there.
- One of each in the household? Label the key to the diesel — a coloured fob, a sticker — because intending to remember is not enough.
- "Diesel", out loud, before you lift the nozzle — every time a new or hired car needs its first tank. It seems silly. It works.
- Mistakes like this are easy to make while your mind is on something else, and so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to block a petrol nozzle, and add-on devices are available for the remainder. Treat it as a safety net, then keep checking the pump.
- Spotting it halfway? Stop there and then. A weaker blend follows from less petrol in that tank, yet the next stage remains the same: don't fire it up.
Killinghall Moor: already put petrol in a diesel?
The order of things is short, then. Leave it unstarted, with your ignition switched off as well. Ask the staff to help you push it clear of the petrol pump if you are still at the forecourt, whether that's Shell or somewhere else. Then call 0333 366 0103 and tell us what got in, roughly how much, and whether it's run.
If it was AdBlue rather than petrol, say so. That is a different fault — corrosion and deposits and not lost protection — and it has its own page for Killinghall Moor.
One petrol in a diesel task in Killinghall Moor costs more than another. Why?
Four separate jobs sit behind the four situations above — which is why there's no fair single price. The situation itself does most of the work of moving your cost. The share counts next, meaning how much of your tank is petrol, followed by the position of the vehicle and whether reaching it is safe for a van.
What got in, how much, and whether it has run — three queries our engineers ask before costing, not after, for precisely that reason. A range turns into a straight figure once the replies are in.
About Killinghall Moor, briefly
Killinghall Moor is a suburban area situated near the River Ure in North Yorkshire, with a mix of semi-detached housing and local amenities. Killinghall Moor sits at an elevation of 87 metres, close to the nearby settlements of Jennyfield, New Park, and Oakdale. Killinghall Moor is located approximately 9 miles from the city of Ripon and 183 miles from London, making it a relatively rural suburb. Killinghall Moor has a population of around 4190 residents, with a predominantly residential character.
Killinghall Moor and North Yorkshire: where our fuel drain cover runs
Our vans answering petrol in diesel call-outs around Killinghall Moor, in the HG postcode area, equally work the locations near it, Jennyfield, New Park and Oakdale included. No need to bring the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places where we work.
In Killinghall Moor and still at the pump?
Then you're in the best spot there is. Ring, and keep it turned off.