Great Kingshill: Put Petrol in a Diesel Car?
With your tank still carrying the fuel and the engine not yet started, nearly every job takes only a drain, so keep the motor off. That outcome is settled in the minutes right after the fill-up, rather than by the amount that went in. Across Great Kingshill and the remainder of Buckinghamshire, Petrol in Diesel drains your car and flushes it where it sits, whether by a roadside, on a drive or at a forecourt. One call our way will be sufficient: our technicians can show you what follows next. Try this first.
What next? Petrol in a diesel, in order
- Do not crank it — and do not believe it when it does start. Here is the part people have wrong about petrol in a diesel in particular. A petrol engine given diesel usually just cannot run, and so the driver stops and the damage halts with them. A diesel given petrol usually starts, ticks over and pulls away just fine for several miles. It's not fine. It is grinding that fuel system as you drive.
- Two jobs, diesel: it ignites, and on the way through it keeps the high-pressure fuel pump and injectors lubricated. Petrol only handles the one. Which is why the car's ignition is left off too — flick it on and you commonly prime your system, and that's petrol leaving that tank for precisely those components.
- Topping up gets rid of nothing. It leaves you a bigger tank of the same mix, because a diesel fuel system does not cope with petrol by percentage the way that guidance presumes — so never add diesel on top to thin it. Type is beside the point too: super unleaded is petrol.
- Wait where you are if you sensibly can. A vehicle that has never shifted is the simplest one to sort, and our team would much rather drive to a difficult spot than have it started. If you are parked on the verge on Cockpit Road, put your hazards on then leave the car there.
- Before you ring, work out your location. Anything nearest to you with a name on it, plus a postcode beginning HP15 6 — that's what settles whether our van arrives or circles.
- Three answers determine the full call-out: the liquid you put in, the approximate volume of it, plus whether it has been going since. The line is 0333 366 0103.
Petrol in a diesel Volkswagen Golf, left at Great Missenden since this morning? The wait has cost you nothing — fuel in a tank is dormant. It was the run in that pulled weakened diesel through your pump. Phone us before you collect it.
If you have put petrol in the diesel Mercedes C-Class in Great Kingshill and you are now sat outside Co-op Food with a boot full of shopping, phone. Never start the car once more to get out of the spot. We'll come to you, empty the tank, flush your fuel lines then put clean diesel in so you can drive away. A mile or so at easy throttle pulls little of it, which is why such jobs are usually the simple ones.
Somebody will tell you to shift the vehicle out of the gateway and deal with it later. Please don't. A misfuelled diesel BMW 1 Series on the zig-zags at Great Kingshill Church of England Combined School is a hassle; the same car restarted three more times to be polite is a fuel system rather than a tank. Every restart primes your lines and drags more petrol past the filter then into the pump. Leave it there, let everyone moan, then phone us.
You drive off at the end, once our technicians have fired it up and made sure it runs smoothly on new diesel, with the fuel system primed. Before that, in the car park at The Polecat Inn, the tainted fuel comes out of that tank, the fuel lines get cleaned and the fuel filter comes off where your Ford Kuga has a serviceable one. Everything starts with three questions when our technicians reach the vehicle: what was put in, how much of it, and whether it has been fired up since.
No warning exists for this, which is why vehicles in that position usually get driven a second time before anyone phones. Do not be one of them. The throttle went dead and the idle turned ragged after a couple of streets, and your diesel Audi Q3 is now waiting by Church of the Good Shepherd. Softness there means fuel that can't build pressure fully rather than a motor giving up. Switch off. Phone us.
Clearing petrol from the diesel at the forecourt
Forecourts are where the work usually begins, and where a fair chunk of it closes. If you are still at the forecourt at Harvest Energy, that's typically where the drain happens — our technicians work on petrol station forecourts routinely, with the site's permission.
Before the motor has run — a forecourt is the single location this is stopped. We can still deal with it where it sits, even away from the pumps. In a car park, on a private drive or in a lay-by, your car has been fired up and driven there, and that sucked fuel through the fuel filter then into the high-pressure fuel pump, all the way from that tank. None of that is a calamity, but the flush then has to go past your tank to the lines and your filter, and the few seconds between seeing the till receipt and reaching for your key are what settle that.
The attendants will generally offer to roll the vehicle out from the pump so the next motorist can get by. That is worth doing. Starting the car just to move four vehicle lengths is not.
Places we cover in Great Kingshill
Being a rural village, Great Kingshill sees a steady visit, whilst its neighbours nearby go along on that same trip: Heath End and Widmer End, Cryers Hill and Spurlands End, Little Kingshill.
Not on this list? That means nothing. The places above are simply the closest few, and nearly all places in Buckinghamshire have a page of their own somewhere on the site. Assuming is the habit to resist, especially on a boundary or somewhere your satnav fails. Call us and enquire.
The area this page includes appears on our map. We work at the roadside, at forecourts, on driveways and in car parks across all of it, and the car never needs to move to us.
Great Kingshill: stranded wherever you parked
Not everybody has a decent spot to pull in. A normal call for us instead of an odd one: worked out after setting off, finished up along the verge on Stag Lane or at a lay-by with the hazards on.
Out of the vehicle while it's not sensible to wait in it, with it if it is. Do not restart it to get to a nicer place. It will go — a diesel on petrol usually obliges — and each mile of obliging pulls the mixture deeper into your fuel system. Carrying on does the vehicle far more harm than a van driving out to a tricky location, and that is no bother for us.
Petrol in a diesel, but your car has moved
Here is where the local M40 comes into it — under 5 miles from Great Kingshill. Lost power, a rough idle, smoke: those are the signs when they appear, rather than a clean stop — and a wrongly fuelled diesel will often get you onto it and some distance along before anything feels wrong at all.
The first safe exit is the one to take. Switch off there, then leave the restarting alone. On a longer drive — anything close to the under 25 miles to the closest city — assume the contamination has been through the filter, the pump and the fuel injectors, and mention it when you phone. It changes what we bring.
Great Kingshill itself
Great Kingshill is a village in Buckinghamshire, situated in the inland countryside of the South East region, with an elevation of around 168 metres. Great Kingshill lies approximately 28 miles west of London and 17 miles northwest of St Albans, near the settlements of Heath End, Widmer End, and Cryers Hill. Great Kingshill has a population of around 1361 residents, predominantly living in detached houses.
Once we get to you in Great Kingshill: what we do
- Three things get established before any quote — the fuel that went in, the quantity, and whether anything has been run since. Each answer alters the work.
- The tank is cleared completely.
- Lines rinsed, filter cleaned. Whatever remains later isn't the thing that created the trouble.
- The system gets bled, on new diesel.
- It is run with fresh diesel in it, and we confirm that it's running smoothly.
That leaves your car ready to set off. All of this is done where the car is, so it never needs to be taken to a garage, and when it has been spotted soon, permanent damage is very rare.
AdBlue in the diesel tank by mistake, in Great Kingshill?
Never start it: that opening step holds whether what went in was AdBlue or petrol. What changes is the fault itself. Petrol thins the diesel and strips the lubrication the system depends on. Urea dissolved in water, AdBlue, and in a diesel tank that brings rust and build-up.
Both are ours. There is a separate Great Kingshill page for AdBlue removal, with the details on it — including the reasons it often turns out to be the worse of the two.
What a petrol-in-diesel drain will cost around Great Kingshill
What moves the price is laid out below, because the job is not one job and we cannot truthfully put a single figure on this page.
- Has it been started or driven? Nothing else matters for as much.
- How much of the wrong fuel went in, weighed against how much that tank can hold.
- Whether it is unleaded or AdBlue.
- Access: the vehicle's position, and whether working on it there's safe for a technician.
The vehicle, the amount, whether it has run — give us those and the answer comes back firm and not as a range. For the car at home that's going nowhere and isn't urgent, is fine too.
Petrol in diesel: everyday questions in Great Kingshill
I am on a forecourt around Great Kingshill. Can you drain it on the spot?
A large portion of this work takes place there, so yes. We attend Esso and the other forecourts around town all the time, with the station's agreement — tell us which one you are at when you call and we will tell you if we can work there.
A couple of litres of petrol in a diesel — too much?
Proportion decides it rather than litres — and more than either, whether the engine has run. What settles how much work is needed is if that mixture has been pulled through the system — because although five litres in a nearly empty tank is a different case from five in a full one, either way that is the query.
I drove it after putting petrol in my diesel. What now?
Somewhere sensible, then stop, then switch off and leave it off. Driving takes the trouble along — out of the tank, into the pump and injectors. People fear it a good deal more than the recovery rate warrants, mind. The one really valuable thing left to you is not restarting it.
Will a fuel drain void my warranty?
No. Carried out correctly, emptying and rinsing is no change at all, and the warranty from your manufacturer is untouched by it. An argument over a warranty is likelier to come from running a diesel on petrol — so leave it turned off.
Two-stroke oil in your tank, and then home?
What petrol has weakened is not put back by two-stroke oil, which is an old workaround for a different problem. So no. Petrol remains in that tank afterwards, whatever else goes in, and the pump gets no break from it.
A main dealer for petrol in a diesel — essential?
You do not need one. Your car is drained and cleaned wherever it is, with no need to take it to a dealership.
Is the vehicle still with you?
The engine remains off.
Turn it off somewhere safe then leave it off, if you have already driven it. Cold, parked, going nowhere: that is the best place to be in. Motorists fear this a lot more than they need to.
Clearing misfuelled cars, Great Kingshill and the rest of Buckinghamshire, wherever they are. Kerbside. Forecourt. Home.