Sheddocksley: Petrol in a Diesel Car? How Worried to Be
Probably less than you are now — provided nobody has started the vehicle. "Have I wrecked it?" is the first question anyone around Sheddocksley asks, and the honest answer is generally no, since petrol resting in a diesel tank hurts nothing till it is dragged through the system — by ignition priming, by the starter, or by being driven. Leave the engine off and ring Petrol in Diesel — that is how you keep it that way. Read on for three things: the effect petrol has inside a diesel engine, the clues of how far it has got, and the way to make sure you never repeat it.
Inside your engine: what petrol in a diesel does
Diesel does two tasks on its way through an engine. It burns, and before it burns it lubricates. What keeps the surfaces inside the high-pressure pump and your injectors from wearing down against each other is the diesel flowing through them — they are made to extremely fine tolerances.
Of those two tasks, petrol handles the first poorly and the second not at all. A pump working on a petrol blend is wearing itself out, because petrol is runnier than diesel and takes away the protection the fuel system depends on. Petrol is also made to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that's where any rattling comes.
Combined, those make the shape of the problem clear. It's movement that does the harm, not contact. A tank with petrol in it is a fuel problem. The beginning 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 serious is petrol in a diesel? Four scenarios our technicians see around Sheddocksley
Fuelled, and not started: no case is better. At a forecourt, and genuinely only there, the petrol is still limited to your tank — because anywhere else your car was driven to get to it. The job is draining and purging on the spot.
A moment's running, or just the ignition on. With the fuel system primed, the fuel lines and filter already contain petrol that has come from the tank. That's generally still a straightforward task — a drain, a flush, and your filter seen to.
Some miles driven, and the pump has spent each of them running on thinned fuel. Mileage is only half of it; how hard it was driven counts equally. Either way this work includes your tank, your lines, your filter and clean fuel through the whole system. On the school run to the local primary school, the distance is short. Any distance on the M90, over 50 miles from Sheddocksley, means the motor has worked hard throughout, and a run to Aberdeen, under 5 miles away, is a very different job too.
It protested, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone ragged. That's the motor telling you its fuel has stopped behaving like diesel. Whether it is the verge on Taransay Court, a lay-by or a side street, stop there and leave it. Lasting damage is very unusual when a vehicle is pulled over early, and the drain and flush-through that still come first deal with it.
Stories Sheddocksley drivers hear about petrol in a diesel
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. A bigger tank of the same mix is all you get, because topping up takes out nothing. That advice presumes a diesel fuel system tolerates petrol by percentage. It does not.
Not so: a modern diesel copes with a bit of petrol. If anything, the reverse. Lubrication matters more on current diesels, not less, since their fuel runs through more precise components at higher pressure.
The myth that catches people out: if it starts and drives, it must be unharmed. A petrol engine fed diesel generally will not run, and so the driver stops and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile your pump grinds. Being able to run is not the same as being fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a distinct problem. None of what petrol diluted is put back by it — and later, the tank still holds that petrol.
The next start draws petrol back round the pump from your lines and the filter, where some of it ends up after your engine has run. That is why draining your tank yourself doesn't sort it — a myth. And, a can of petrol filled at the roadside is truly risky.
Why petrol in a diesel happens at all
It's rarely carelessness, and nobody does it on purpose. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol car at all. The forecourt makes it simple, and the mistake runs one way.
When habit and the vehicle stop matching, it happens. Any motor that is new to you — hired, on loan as a courtesy car, or brand new. A household with one petrol and one diesel on the drive. The pumps in a different order on a familiar forecourt. A hurried fill en route to Aberdeen with a train to catch. Exactly the moment it occurs: after years of driving petrol, someone fills a diesel Renault Clio for the first time. Throw in a back seat full of kids, a phone call or rain, and habit takes over.
Avoiding petrol in a diesel next time you fill up in Sheddocksley
- The label is what counts, so read the pump rather than the colour: in the UK unleaded handles are normally green and diesel black, yet not on every forecourt.
- In a motor you don't know, look inside the flap over your filler or at the cap before the first fill: many cars state the fuel type there.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, for a house with one of each.
- Before the nozzle comes off the pump the first time you fill a hired or new motor, say "diesel" aloud. Daft, perhaps, yet it works.
- Mistakes like this are straightforward to make whilst your mind is on something else, and so the phone goes away.
- Some diesels have a filler designed to block a petrol nozzle, and devices you can add exist for motors without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop checking the pump.
- The moment you realise, stop: less petrol inside that tank makes a weaker mixture. What to do next does not change, though — still do not start the vehicle.
Put petrol in a diesel around Sheddocksley already?
Then the order of things is short. Starting it is out, and so is switching on your ignition. If you're still on the forecourt — Shell or anywhere else — ask the staff to help you roll the car away from the pump. Next, 0333 366 0103. We will ask what went in, about how much, and if it has been run.
Corrosion and deposits are the trouble with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and see its own Sheddocksley page.
Sheddocksley petrol in a diesel jobs: why one costs more than another
The four scenarios above are four different tasks, so no single price for this would be honest. The situation itself does most of the work of moving the cost. The proportion counts next, meaning how much of the tank is petrol, and then the position of the car and whether getting to it is safe for a technician.
What was put in, how much, and if it has run — three queries our engineers ask before costing, not after, for precisely that reason. A range turns into a straight figure once those answers are in.
About Sheddocksley itself
Sheddocksley is a suburban area situated near the River Don in Aberdeen City, with a mix of terraced housing and local amenities. Sheddocksley sits at an elevation of 126 metres, approximately 3.2 miles from Aberdeen city centre, and is surrounded by nearby suburbs such as Mastrick and Summerhill. Sheddocksley has a population of around 5589 residents, living in a predominantly residential community. Sheddocksley is located near the Northfield area, with easy access to Aberdeen's city centre.
Fuel drain cover across Aberdeen City, Sheddocksley included
Our vans answering petrol in diesel calls around Sheddocksley, in the AB postcode area, equally work the locations near it, Mastrick, Summerhill and Northfield included. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations our technicians work, and your vehicle doesn't need to move to us.
Sheddocksley: still at the pump?
Then you're in the best position there is. Keep it off. Ring.