How Worried Should You Be? Petrol in a Diesel Car in Graig Trewyddfa
Unstarted? Then less anxious than you probably are. "Have I wrecked it?" is the first thing everyone around Graig Trewyddfa asks, and the truthful answer is usually no, since petrol left in a diesel tank harms nothing till it is drawn through the system — by ignition priming, by the starter, or by being driven. Petrol in Diesel is who to call, with your engine kept off, and so it remains that way. Read on for three things: the effect petrol has inside a diesel engine, the signs of how far it has spread, and the way to make sure you never repeat it.
What petrol in a diesel does to your engine
Two tasks fall to diesel on its journey round a motor. It combusts, and before it burns it protects. What stops the surfaces inside the high-pressure pump and the injectors from grinding against one another is the diesel flowing through them — they are designed to very fine tolerances.
The second task petrol doesn't do at all, and the first it does poorly. The rattling comes from petrol being made not to ignite when compressed, which is precisely the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips away the lubrication your system rests on, and any pump running on such a blend is wearing itself.
Put those together and the shape of the trouble is clear. It's movement that causes the harm, not contact. Where that petrol is only in that tank, it is a fault of fuel, nothing more. 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 the fuel to the injectors beyond it.
How bad is petrol in a diesel? Four scenarios our engineers see around Graig Trewyddfa
Filled up, and never started: nothing beats it. Being at a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With that petrol kept inside that tank alone, it's cleared and purged on the spot, and nothing more is needed.
Your ignition switched on, or a brief start. The fuel system has been bled, so petrol has left your tank and got to the fuel filter and your lines. That's usually still an easy task — a drain, a flush, and the fuel filter seen to.
A couple of miles driven, and the pump has spent every one of them working on weakened fuel. Tank, lines, filter, then fresh fuel run through the whole system: that's this work, and the way your car was driven counts as much as the distance. Driving the children to the local primary school is one kind of trip. Very different again: a run to Swansea, under 3 miles away, or some mileage on the M4, under 3 miles from Graig Trewyddfa, where your engine never stopped running hard.
Driven on till it protested — rattling, smoke, a ragged idle, a soft throttle. The fuel is not behaving like diesel any more, and your motor is telling you. Leave it where it stops: a lay-by, a side street, the verge on Neath Road. The fuel drain and flush-through still go first, and they sort it out: when a car is pulled over early, long-term damage is very uncommon.
Graig Trewyddfa people and the petrol in a diesel stories they hear
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Topping up removes nothing; it gives you a bigger tank of the same mix. That advice assumes a diesel fuel system tolerates petrol by percentage. It doesn't.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. A current diesel sends its fuel through more precise parts at higher pressure, which makes the lubrication matter more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that fools drivers. Diesel in a petrol motor generally means a motor that won't 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. Running doesn't mean fine.
An old fix for a different issue is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." What petrol has diluted remains diluted, and the petrol stays inside that tank regardless.
Once the motor has run, part of that petrol sits in the fuel filter and your lines, not the tank — and your next start pulls it straight back through the pump. So the myth "drain that tank yourself and you are sorted" does not hold. Besides, petrol drained into a can by the road is truly dangerous.
Petrol in a diesel: how does it happen?
Carelessness is rarely the cause, and nobody means to do it. A diesel nozzle generally will not fit a petrol vehicle, yet the slimmer petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake simple, and only in one direction.
The moment habit stops matching the car is the moment it occurs. Hire cars, courtesy cars, and vehicles that are new to you. One petrol and one diesel on the drive of the same household. A forecourt you know, but with its pumps arranged differently. Filling up in a rush en route to Llansamlet, with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver used to petrol: precisely when it takes place. With rain, a call coming in, or a car full of children to deal with, the hand just does what it has always done.
Preventing petrol in a diesel next time you fill up in Graig Trewyddfa
- The label is what matters, so check the petrol pump instead of the colour: in the UK unleaded handles are usually green and diesel black, but not on every forecourt.
- The first fill in a strange car is the time to check your filler flap — on it, or on the cap, plenty of cars state the fuel they take.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of meaning to remember, in a home with one of each.
- 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 pump. It sounds daft and it works.
- Tuck your phone away. This is an easy mistake to make while you're thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to block a petrol nozzle, and add-on devices are available for vehicles without one. They are a safety net, not a reason to stop checking the petrol pump.
- As soon as you notice, stop: less petrol in the tank makes a thinner mix. What to do next doesn't change, though — still don't crank it.
Graig Trewyddfa: already put petrol in a diesel?
Then, there's just a short order of things. Leave it unstarted, with your ignition off as well. If you are still at the forecourt — Asda or anywhere else — ask the attendants to help you roll it clear of the pump. Then ring 0333 366 0103 and tell us what was put in, roughly how much, and if it's run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a separate issue — Graig Trewyddfa has a page just for it.
What makes one Graig Trewyddfa petrol in a diesel task cost more than the next
The four scenarios above are four different tasks, so no single price for this would be honest. What shifts the cost is chiefly which of them you are in. Two things come after that: the petrol that got in as a share of what that tank holds, then the spot the vehicle is in and whether our van can reach it safely.
What was put in, how much, and if it's run — three questions we ask before pricing, not after, for precisely that reason. A range becomes a straight figure once those answers are in.
About Graig Trewyddfa, briefly
Graig Trewyddfa is a suburban area located on the coast near Swansea, with a mix of terraced housing and local amenities. Graig Trewyddfa sits at an elevation of 27 metres, close to nearby places such as Plas-Marl and Morriston. Graig Trewyddfa is situated approximately 2.6 miles from Swansea city centre, making it a convenient residential location. Graig Trewyddfa has a population of around 2534 people, according to recent estimates.
Graig Trewyddfa and Swansea: where our fuel drain cover reaches
Petrol in diesel calls around Graig Trewyddfa — part of the SA postcode area — go to teams that likewise cover the places round it, Plas-Marl, Morriston and Cnap-Llwyd included. No need to bring your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places where we work.
At the petrol pump in Graig Trewyddfa, right now?
The best position there is, then — that is where you are. Ring, and keep it switched off.