How Worried Should You Be? Petrol in a Diesel Car in Weston
Provided it hasn't been started, you can worry less than you probably are. Everyone around Weston starts with "have I wrecked it?", and the honest answer is normally no: petrol resting inside the tank of any diesel remains harmless until priming, cranking or driving draws it into the system. Leave the motor off and call Petrol in Diesel — that is how you keep it like that. What petrol actually does to a diesel, how to gauge how far it's travelled, and how to stop it from happening again: that is the rest of this page.
Your engine and petrol in a diesel: what goes on
Two tasks fall to diesel on its journey round a motor. Lubricating comes before burning; it does both. What stops the surfaces inside the high-pressure fuel pump and the fuel injectors from wearing against one another is the diesel flowing through them — they're built to very fine clearances.
Badly at the first, not at all at the second: that's petrol. The clattering 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 away the lubrication your system depends on, and any pump working on that mixture is wearing itself.
Put these together and the shape of the trouble is clear. The harm is done by movement, not by contact. Petrol in a tank is a fuel issue. Whatever a worn pump sheds travels on, borne by the fuel, into the fuel injectors downstream, which is why a pump that has been working on that petrol is where a mechanical fault starts.
Petrol in a diesel in Weston: how bad is it? Four cases
Fuelled up, not once started. The best case there is. On a forecourt, and genuinely only there, that petrol is still limited to the tank — since everywhere else your car was driven to reach it. The job is draining and cleaning on the spot.
Started for a moment, or only your ignition on. With the system primed, your lines and filter now hold petrol that has come from your tank. Normally little more than emptying, rinsing and sorting the fuel filter, and so still straightforward.
Driven a couple of miles. Now the pump has spent those miles working on thinned fuel. The work is that tank, your lines, the filter and clean fuel through the entire circuit, and how hard the vehicle was driven counts as much as how far. A school run to St Mary's Catholic Primary School is one thing. Driving as far as Bath, under 3 miles away, makes a very different task — as does any distance on the M4, under 10 miles from Weston, with the engine running hard all the way.
Driven on till it protested — rattling, smoke, a lumpy idle, a dead throttle. The motor is telling you your fuel is no longer acting like diesel. Leave it wherever it stops: a lay-by, a side street, the verge on Crown Road. What comes first is still the drain and flush, and that deals with it, with long-term damage very unusual when a car is pulled over soon.
Stories Weston motorists hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing is removed when you top up — that tank simply holds more of the same mixture. Percentage is not how a diesel fuel system tolerates petrol, however much that advice assumes.
If anything, the reverse holds. Myth: "A modern diesel can cope with a bit of petrol." At higher pressure, through smaller parts: that is how a modern diesel handles its fuel, so the lubrication matters more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that fools motorists. The motorist of a petrol motor fed diesel normally stops, because it will not run, and the harm stops there. Feed petrol to a diesel and it generally starts, idles and drives away as if nothing has happened — all while its pump is wearing. Being able to run is not the same as being fine.
Myth: a two-stroke additive makes it safe to drive home. It was an old workaround, supposed for another issue. It does not put back what petrol has weakened, and the petrol is still in your tank afterwards.
Once the engine has run, part of that petrol sits in the fuel filter and the fuel lines, not your tank — and your next start pulls it right back through your pump. So the myth "drain the tank yourself and you are sorted" doesn't stand up. It is also truly hazardous to drain petrol into a can by the roadside.
How it happens: petrol in a diesel
Nobody does it on purpose, and it is seldom carelessness. One way only, since of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol motor. That's how the forecourt makes it straightforward.
It occurs when habit and your car stop matching. 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. Racing for a train outside Oldfield Park and filling up en route. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist accustomed to petrol: precisely when it takes place. Your hand does what it has always done once you add rain, a phone call or a back seat full of kids.
How to avoid petrol in a diesel at your next fill-up around Weston
- The label is what counts, so read the petrol pump rather than the colour: in the UK unleaded handles are usually green and diesel black, but not on each forecourt.
- The first fill in a new vehicle is the time to check your filler flap — inside it, or on the cap, many cars state which fuel they take.
- One of each in the household? Label the key to the diesel — a coloured fob, a sticker — because meaning to remember is not enough.
- "Diesel", out loud, before you pick up the nozzle — each time a new or hired car gets its first tank. It sounds daft. It works.
- While you're thinking about something else, this is an easy mistake to make — so put the phone away.
- Add-on devices exist for motors without one, and some diesels are built with a filler that won't accept a petrol nozzle. Helpful — but a safety net at best, never a reason to stop checking the label.
- Less petrol makes a weaker mixture, so stop as soon as you notice — though remembering that your next step is unchanged. It's still not to crank it.
Weston: already put petrol in a diesel?
Then, there's only a short order of things. Leave it unstarted, with your ignition switched off as well. If you're still on the forecourt — Gulf or anywhere else — ask the staff to help you roll the vehicle clear of the petrol pump. Next, 0333 366 0103. We will ask what got in, about how much, and if it's been run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a different fault — Weston has a page just for it.
Weston petrol in a diesel jobs: why one costs more than another
An honest single price doesn't exist here: four scenarios, four separate tasks. Which of them you are in is mostly what shifts the cost. Where the vehicle is counts too, and whether a van can safely reach it, after the ratio of petrol to what that tank takes.
What went in, how much, and whether it has run — three questions our technicians ask before costing, not after, for exactly that reason. With those replies, you get a straight figure instead of a range.
About Weston and its setting
Weston is a suburban area in Somerset, situated on the River Avon, with Combe Park and Weston Park nearby. Weston sits at an elevation of 57 metres, close to the city of Bath, and is characterized by semi-detached housing. Weston is part of the larger urban area surrounding Bath, with Upper Weston also in the vicinity. Weston has a population of approximately 4959 residents.
Fuel drain cover around Weston and across Somerset
Combe Park, Weston Park and Upper Weston are among the spots around Weston that the same vans work, answering petrol in diesel jobs across Weston's BA postcode area. Our engineers drain wherever the car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
At the petrol pump around Weston, still?
No position is better: that is where you are. Call, and keep it turned off.