Petrol in a Diesel Car in Verwood: How Worried Should You Be?
If it has not been started, worry less than you likely are. Petrol resting in a diesel tank does nothing to your engine until something draws it through the fuel system — the ignition priming the pump, your starter, or driving itself. So the honest answer to the first query anyone in Verwood asks, "have I wrecked it?", is usually no. To keep the vehicle like that, phone Petrol in Diesel then leave your engine alone. Keep reading 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 don't repeat it.
Petrol in a diesel: what does it do to the engine?
Diesel does two tasks on its way through an engine. Lubricating comes before burning; it does both. Made to very fine tolerances, the injectors and the pump rely on your diesel moving through them to keep their surfaces from wearing against one another.
Of these two tasks, petrol manages the first poorly and the second never. A pump running on a petrol mixture is wearing itself out, because petrol is thinner than diesel and strips out the protection the fuel system relies on. Petrol is also made to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that is where any knocking starts.
Together, those leave the shape of the trouble clear. The damage is done by movement, not by contact. Where the petrol is only in that tank, it's a fault of fuel, nothing more. Whatever a worn pump sheds travels on, carried by your fuel, into the injectors downstream, which is why a pump that has been working on the petrol is where a mechanical fault starts.
Four situations our technicians see in Verwood: how serious is petrol in a diesel?
Filled up, not once started. The best case there is. Just the tank has petrol in it, and so the job is draining that tank and purging the fuel system where your car stands. This scenario can only really happen on a forecourt: anywhere else, the vehicle got there by being driven.
Started for a second, or just your ignition on. Petrol has left that tank and got to the filter and the fuel lines, because the fuel system has been primed. Normally nothing more than clearing, flushing and sorting the fuel filter, and so still easy.
The pump now worked a few miles on weakened fuel — that is what driving the car does. The work is your tank, the lines, your filter and fresh fuel through the whole circuit, and how hard your car was driven counts as much as how far. Short trips, such as the school run to Hillside Community First School, are one thing. Any mileage on the M27, under 15 miles from Verwood, means the motor has worked hard throughout, and a run to Salisbury, under 15 miles away, is a very different task too.
Driven till it protested. Knocking, an uneven idle, smoke, a throttle that has gone soft. The engine is telling you the fuel is no longer acting like diesel. Whether it is the verge on Manor Road, a lay-by or a side street, stop where you are then leave it. Lasting damage is very uncommon when a vehicle is pulled over quickly, and the drain and flush that still come first sort it out.
Stories Verwood 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 by topping up — you are left with a bigger tank, still the same mixture. The idea behind that advice — that diesel fuel systems accept petrol by percentage — is wrong.
Not so: a modern diesel copes with a bit of petrol. If anything, the reverse. At higher pressure, through more precise parts: that's how a newer diesel handles its fuel, and so the protection matters for more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there's no harm done." Diesel in a petrol motor usually leaves a motor that will not run: the motorist stops, and so does the damage. While your pump grinds, a diesel fed petrol normally starts, idles and drives away as though nothing has happened. Being able to run is not the same as being fine.
Not so: a two-stroke additive makes it safe to drive home. It is an old fix, supposed for another problem. That petrol is still inside the tank afterwards, and what it has weakened is not put back.
If the engine has run, part of the petrol sits in your filter and the lines, not the tank — and your next start sends it right back through your pump. So the myth "drain that tank yourself and you're sorted" does not stand up. Also, a can of petrol drained by the roadside is genuinely hazardous.
How does petrol in a diesel happen?
Carelessness is seldom the cause, and nobody means to do it. The petrol nozzle is the smaller of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol motor at all. The forecourt makes it easy, and the mistake runs one way.
Habit and your car falling out of step is how it takes place. A new vehicle, a hire car or a courtesy car. Two cars on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. Rushing for a train at Pokesdown and fuelling up en route. A new-to-you diesel Volkswagen Passat, its first fuelling, and a motorist accustomed to petrol: precisely when it takes place. Add rain, a phone call or a back seat full of children, and the hand does what it has always done.
How to avoid petrol in a diesel at your next fill-up in Verwood
- Green for unleaded and black for diesel is usual in the UK — yet not on every forecourt. Go by the label on the petrol pump, not the colour.
- In a motor you do not know, look inside the flap over your filler or at the cap before the first fill: plenty of vehicles state the fuel there.
- A coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember, for a home with one of each.
- "Diesel", aloud, before you pick up the nozzle — each time a new or hired car needs its first tank. It sounds daft. It works.
- Put your phone away. This is an easy mistake to make while you are thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject 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.
- Stop as soon as you realise. Less petrol inside your tank means a thinner blend. It does not change what to do next, which is still not to crank it.
Already put petrol in a diesel around Verwood?
The order of things is brief, then. Leave it unstarted, with the ignition switched off as well. The staff on the forecourt — whether at Morrisons itself or wherever you filled up — will normally help roll it clear of the petrol pump if you ask. Phone 0333 366 0103 next, with three facts — your fuel, the approximate amount, and whether it has run.
If it was AdBlue instead of petrol, say so. That is a different issue — corrosion and deposits instead of lost protection — and it has its own page for Verwood.
Verwood petrol in a diesel tasks: why one costs more than another
An honest single price does not exist here: four scenarios, four separate jobs. Chiefly, the cost moves with which one you are in. Where the vehicle is counts too, and whether a van can safely get to it, after the proportion of petrol to what the tank takes.
What went in, how much, and whether it has run — three questions our technicians ask before pricing, not after, for precisely that reason. Given those answers, you get a straight figure instead of a range.
About Verwood
Verwood is a town in Dorset, situated inland at an elevation of 46 metres, approximately 13.5 miles from Salisbury. Verwood has a population of around 10722 people and is characterised by predominantly detached housing. Verwood is located near several notable areas, including Dewlands Common and is within commuting distance of major cities, with London being around 87.3 miles away.
Fuel drain cover across Dorset, Verwood included
Verwood waits in the BH postcode area, and the vans that answer petrol in diesel jobs there work the spots around it as well — Dewlands Common, Romford and Gotham among them. Our technicians 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.
In Verwood and still at the petrol pump?
Then you are in the best position there can be. Turned off it remains; then phone.