Dinnington: Petrol in a Diesel Car? How Worried to Be
Less than you probably are, if it hasn't been started. Petrol resting in a diesel tank does nothing to your engine until something pulls it through your fuel system — your ignition priming your pump, your starter, or driving on its own. So the honest answer to the first query everyone in Dinnington asks, "have I ruined it?", is normally no. Leave the motor off and phone Petrol in Diesel — that is how you keep it that way. The remainder of this page covers what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you again.
Your engine and petrol in a diesel: what goes on
On its way through a motor, diesel has two jobs. Oiling comes before burning; it does both. Built to very fine tolerances, the fuel injectors and the pump depend on the diesel flowing through them to stop their surfaces wearing against one another.
The second task petrol does not do at all, and the first it does badly. The knocking comes from petrol being made not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the lubrication the fuel system depends on, and any pump working on that mix is wearing itself.
The shape of the problem is clear when you put those together. The harm is done by movement, not by contact. Where that petrol is only inside that tank, it is a problem of fuel, nothing more. Whatever a worn pump sheds travels on, borne by your fuel, into your injectors further along, which is why a pump that has worked on that petrol is where a mechanical problem begins.
Four scenarios our engineers see in Dinnington: how serious is petrol in a diesel?
Fuelled up, not once started. The best case there can be. Being at a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With the petrol held in your tank alone, it is drained and rinsed on the spot, and nothing more is needed.
Your ignition turned on, or a short start. With the system primed, the fuel lines and filter now contain petrol that has come from the tank. Drain, flush, see to your filter: still usually simple.
Driven a few miles. Now your pump has spent these miles working on thinned fuel. The work is the tank, the lines, your filter and clean fuel through the whole circuit, and how hard the vehicle was driven matters as much as how far. Short trips, like the school run to St Joseph's Catholic Primary School, are one thing. Getting as far as Sheffield, under 15 miles away, makes a very different task — as does any distance on the M1, under 3 miles from Dinnington, with the motor working hard all the way.
Knocking, an uneven idle, smoke, a throttle gone soft: driven till it complained. The motor is telling you the fuel is no longer behaving like diesel. Leave it where it has stopped: a lay-by, a quiet street, the verge on Leopold Street. The fuel drain and flush still go first, and they deal with it: when a vehicle is stopped early, long-term damage is very unusual.
Stories Dinnington people hear about petrol in a diesel
"Top it up the rest of the way with diesel and it will be fine" — a myth. It will not. Nothing is removed when you top up — that tank simply holds more of the same mixture. That advice supposes a diesel fuel system handles petrol by percentage. It doesn't.
If anything, the reverse holds. Myth: "A current diesel can cope with a bit of petrol." A current diesel sends its fuel through more precise parts at higher pressure, which makes the lubrication count more, not less.
"It starts, it drives, and so no harm done" — the myth that trips up most people than any other. The motorist of a petrol motor fed diesel normally stops, since it will not run, and the harm stops with them. A diesel fed petrol normally starts, idles and drives away as though nothing has happened, while the pump wears. Being able to run isn't the same as being fine.
Not so: a two-stroke additive lets you to drive home. It is an old workaround, supposed for another problem. The petrol is still inside your tank afterwards, and whatever it has diluted is not put back.
If the engine has been run, part of that petrol is in the fuel filter and your lines, not that tank — and your next start pulls it right back through the pump. So the myth "drain the tank yourself and you are sorted" doesn't stand up. Clearing petrol into a can at the roadside is also genuinely dangerous.
Petrol in a diesel: how does it take place?
It is rarely carelessness, and nobody does it on purpose. The forecourt makes it simple: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle generally won't go into a petrol vehicle at all. So the error runs one way.
Habit and the car falling out of step is when it takes place. Courtesy car, hire car, or a motor that's new. One petrol and one diesel on the driveway of the same household. A forecourt you know, only with its pumps laid out differently. Filling up in a hurry on the way to Kiveton Park, with a train to catch. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that's when. Add rain, a phone call or a back seat full of children, and the hand does what it has always done.
Dinnington motorists: how to prevent petrol in a diesel next time
- The label is what counts, and so check the pump rather than the colour: in the UK unleaded handles are usually green and diesel black, yet not on each forecourt.
- In a car you don't know, look inside the flap over the filler or at the cap before your 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 intending 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 seems silly and it works.
- While you are thinking about something else, this is an easy mistake to make — so put your phone away.
- Some diesels have a filler designed to reject a petrol nozzle, and devices you can add are available for vehicles without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the pump.
- Stop as soon as you notice. Less petrol inside the tank makes a thinner blend. It doesn't change what to do next, which is still not to start it.
Already put petrol in a diesel in Dinnington?
Short and simple, then, is the order of things. Leave it unstarted, with the ignition off too. If you are still at the forecourt — Tesco or anywhere else — ask the staff to help you push the car away from the pump. Next, 0333 366 0103. We'll ask what went in, about how much, and if it's been run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a separate problem — Dinnington has a page just for it.
One petrol in a diesel job in Dinnington costs more than another. Why?
An honest single quote doesn't exist here: four situations, four separate tasks. Which of them you are in is chiefly what moves your cost. Beyond that it's the ratio — how much petrol was put in against how much your tank takes — and then where your car is and whether a van can get to it safely.
What got in, how much, and whether it's run — three questions we ask before costing, not after, for precisely that reason. The replies turn a range into a straight figure.
About Dinnington, for a moment
Dinnington is a town in South Yorkshire, situated approximately 10 miles from Sheffield, and is characterised by its semi-detached housing stock. Dinnington sits inland, at an elevation of around 117 metres, and is close to nearby places such as Laughton Common and Throapham. Dinnington is located in the Yorkshire and the Humber region, about 136 miles north of London. Dinnington has a population of around 12,894 people.
Across South Yorkshire and in Dinnington: fuel drain cover
Our vans answering petrol in diesel calls in Dinnington, in the S postcode area, also work the spots near it, Laughton Common, Throapham and North Anston included. You need not move your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places where we work.
At the pump around Dinnington, right now?
Then you're in the best place there is. Keep it off. Ring.