How Worried Should You Be? Petrol in a Diesel Car in Alwoodley Gates
Less than you likely are, if it has not been started. Everyone around Alwoodley Gates begins with "have I ruined it?", and the fair answer is usually no: petrol resting inside that tank of any diesel remains harmless till priming, cranking or driving pulls it into the fuel system. Petrol in Diesel is who to call, with the engine kept off, so it remains that way. The rest of this page explains what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you again.
Petrol in a diesel: what does it do to the engine?
On its way through a motor, diesel does two jobs. Before it combusts, it protects — and then it ignites. Your high-pressure pump and the injectors are built to very fine tolerances, and the diesel passing through them is what keeps those surfaces from wearing down against one another.
The second task petrol doesn't do at all, and the first it does badly. Being less viscous than diesel, petrol strips out the protection a fuel system needs, leaving a pump on the blend to wear itself. It is also made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the rattling.
Combined, those leave the shape of the problem plain. Not contact but circulation is what causes the damage. All a tank with petrol in it amounts to is a fuel issue. Whatever a worn pump sheds goes on, carried by your fuel, into your injectors further along, which is why a pump that has worked on the petrol is where a mechanical fault starts.
How serious is petrol in a diesel? Four scenarios our engineers see in Alwoodley Gates
The best case there is: filled up, not once started. That petrol is in that tank and only the tank, and the job is a drain and a flush where the vehicle stands. This is the one situation that can only really occur on a forecourt, because anywhere else the car has been driven to get there.
Started for a second, or just your ignition on. With the system primed, the fuel lines and filter already contain petrol that has come from your tank. That is usually still an easy job — a drain, a flush, and the filter seen to.
Driven a few miles. Now the pump has spent those miles working on weakened fuel. Tank, lines, filter, then clean fuel run through the whole circuit: that's this work, and the way the car was driven counts as much as the mileage. Driving the kids to Wigton Moor Primary School is one sort of trip. A run as far as Leeds, under 5 miles away, is a very different job. So is any distance on the A58(M), under 5 miles from Alwoodley Gates, where the engine has been working hard throughout.
Driven until it complained. Rattling, an uneven idle, smoke, a throttle that has gone soft. That is the engine telling you its fuel has stopped acting like diesel. Stop wherever you are — the verge on Wigton Lane, a lay-by, a side street — and leave it there. The drain and flush-through still go first, and they sort it out: when a vehicle is stopped soon, lasting damage is very uncommon.
Myths Alwoodley Gates people hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Nothing comes out when you top up — the tank just carries more of the same blend. A diesel fuel system does not accept petrol by percentage in the way that advice assumes.
Not so: a current diesel copes with a bit of petrol. Rather, the reverse. More precise components and higher pressure are how a modern diesel runs its fuel, and that makes the protection count more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that fools motorists. Diesel in a petrol motor usually means a motor that will not run: the driver stops, and so does the harm. Whilst your pump wears, a diesel fed petrol normally starts, idles and drives away as though nothing has happened. Fine and running are not the same thing.
An outdated fix for a separate problem lies behind this one. Myth: "Add some two-stroke oil and drive it home." What petrol has weakened remains thinned, and that petrol remains inside your tank anyway.
Myth: "Drain the tank yourself and you are sorted." After your engine has been run, some of the petrol is no longer inside the tank: it is in the fuel filter and the fuel lines, and it goes right back through the pump at the next start. It is also really risky to drain petrol into a can by the roadside.
Petrol in a diesel: how does it take place?
No one does it on purpose, and it's rarely carelessness. One way only, since of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one generally will not fit a petrol motor. That's how the forecourt makes it easy.
It occurs when routine and the vehicle stop matching. Hire cars, courtesy cars, and vehicles that are new to you. One petrol and one diesel on the driveway of the same household. The pumps in a different order on a well-known forecourt. A hurried fill en route to Headingley with a train to catch. Years of petrol cars behind you, a diesel Volkswagen Golf in front of you at the forecourt for its first tank — that is when. Throw in rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
How to avoid petrol in a diesel on your next fill-up in Alwoodley Gates
- Check the pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on every forecourt. The label is what counts.
- Inspect the filler flap. Plenty of motors state the fuel type inside the flap or on the cap. Look at it on your first fill in a motor you do not know.
- Good intentions do less than a sticker or a fob in a vivid colour on your diesel's key if a home has one of each. So label it.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump. It seems daft and it works.
- Thinking about something else is when this becomes an easy mistake to make, so put your phone away then keep your mind on the pump.
- Add-on devices are available for motors without one, and some diesels come with a filler that will not accept a petrol nozzle. Useful — but a backstop at best, never a reason to stop checking the label.
- Spotting it mid-fill? Stop at once. A thinner blend follows from less petrol inside that tank, yet your next step stays the same: do not start the car.
Petrol already in a diesel around Alwoodley Gates? Begin here
The order of things is short, then. Starting it is out, and so is switching on your ignition. The staff at the forecourt — whether at Asda itself or wherever you filled up — will usually help push it clear of the petrol pump if you ask. Ring 0333 366 0103 next, with three facts — the fuel, the approximate quantity, and if it's run.
Corrosion and deposits are the problem with AdBlue, where petrol means lost protection. So if it was AdBlue, say so — and see its own Alwoodley Gates page.
Alwoodley Gates petrol in a diesel jobs: why one costs more than another
The four situations above are four separate jobs, so no single quote for this would be honest. The scenario itself does most of the work of moving the cost. Two things come after that: the petrol that got in as a share of what that tank takes, then the spot the vehicle is in and whether a technician can reach it safely.
Three questions come first, before quoting, rather than after — what went in, how much, has it run — and that is the reason. Those replies are what turn a range into one firm number.
About Alwoodley Gates
Alwoodley Gates is a suburban area located on the outskirts of Leeds, situated near the River Aire in West Yorkshire. Alwoodley Gates sits at an elevation of 142 metres, with detached housing being the predominant type of accommodation in the area. Alwoodley Gates is close to nearby places such as Alwoodley, Slaid Hill, and Camp Town, and is approximately 4.3 miles from Leeds city centre.
Across West Yorkshire and around Alwoodley Gates: fuel drain cover
Alwoodley, Slaid Hill and Camp Town are among the locations around Alwoodley Gates that the same teams work, answering petrol in diesel jobs across Alwoodley Gates's LS 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 come to us.
At the pump in Alwoodley Gates, right now?
No position is better: that is where you now are. Phone, and leave it switched off.