How Worried Should You Be? Petrol in a Diesel Car in Hawkwell
Far less than you likely are, if it has not been started. Petrol sitting in a diesel tank does nothing to your engine till something draws it through the fuel system — the ignition priming your pump, your starter, or driving itself. So the fair answer to the first question anyone around Hawkwell asks, "have I ruined it?", is generally no. Keep it like that: leave your motor off then call Petrol in Diesel. Further down, this page sets out what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you a second time.
Petrol in a diesel: what does it do to the motor?
On its way through an engine, diesel does two tasks. It protects first, and only then does it burn. What stops the surfaces inside your high-pressure pump and the fuel injectors from wearing against each other is your diesel passing through them — they are made to very fine tolerances.
The second task petrol doesn't do at all, and the first it does badly. The clattering comes from petrol being designed not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips away the protection your system hinges on, and any pump running on such a blend is wearing itself.
Put these together and the shape of the issue is clear. It's movement that causes the damage, not contact. Petrol in a tank is a fuel problem. Once your pump has been working on that petrol, a mechanical issue has begun: whatever is shed by a pump that is grinding is carried onward to the injectors with your fuel.
Hawkwell, petrol in a diesel: four situations, from mild to serious
Fuelled up, not once started. The best case there is. Only the tank has petrol in it, so the job is clearing your tank and flushing your system where the vehicle stands. This situation can only really take place on a forecourt: anywhere else, the vehicle got there by being driven.
Ignition on, or started for a second. The system has been primed, and so petrol has left the tank and got to the filter and the lines. Usually nothing more than emptying, rinsing and sorting the filter, and so still easy.
Your pump now worked a couple of miles on thinned fuel — that's what driving it does. Tank, lines, filter, then fresh fuel run through the whole circuit: that is this work, and the way the car was driven matters as much as the distance. Short trips, such as the school run to Lift Westerings, are one matter. A run as far as Southend-on-Sea, under 5 miles away, is a very different job. So is any miles on the M2, under 25 miles from Hawkwell, where the engine has been working hard throughout.
Driven on until it protested — clattering, smoke, a ragged idle, a dead throttle. What you are hearing is your engine signalling fuel that no longer behaves like diesel. Whether it's the verge on Hill Lane, a lay-by or a side road, stop where you are then leave it. The drain and flush-through still go first, and they deal with it: when a vehicle is stopped soon, lasting damage is very uncommon.
Hawkwell motorists and that petrol in a diesel myths they hear
"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 carries more of the same blend. The assumption behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
"Newer diesels can handle a little petrol" — a myth, and closer to the opposite. Smaller parts and higher pressure are how a current diesel runs its fuel, and that makes the lubrication count more, not less.
This is the one that catches drivers. Myth: "If it starts and drives, there is no damage done." Diesel in a petrol motor normally leaves a motor that won't run: the motorist stops, and so does the damage. Feed petrol to a diesel and it usually starts, idles and pulls away like nothing happened — all the while its pump wears. Being able to run is not proof of being fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct issue. It does not put back what petrol has thinned, and the petrol is still inside the tank later.
Once your engine has run, part of the petrol sits in your filter and your lines, not your tank — and the next start sends it straight back through your pump. So the myth "drain your tank yourself and you're sorted" does not stand up. On top of that, petrol cleared into a can by the road is truly risky.
How does petrol in a diesel take place?
On purpose? Never. Through carelessness? Seldom, if ever. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle generally won't go into a petrol motor at all. So the mistake runs one way.
When habit and your car stop matching, it occurs. Hire cars, courtesy cars, and vehicles that are new to you. A household with one petrol and one diesel on the drive. The pumps in a different order on a familiar forecourt. Fuelling up in a hurry en route to Hockley, with a train to catch. Exactly the moment it occurs: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Your hand does what it has always done when you add rain, a phone call or a back seat full of children.
Next time you fill up around Hawkwell: preventing petrol in a diesel
- Read the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, yet not on every forecourt. The label is what matters.
- Many vehicles state the fuel type inside the filler flap or on the cap, and so check there on the first fill in any motor you don't know.
- One of each in the house? Mark the key to your diesel — a coloured fob, a sticker — because meaning to remember is not enough.
- Before the nozzle leaves the petrol pump the first time you fill a hired or new car, say "diesel" out loud. Daft, yes, but it works.
- Whilst you are thinking about something else, this is an easy mistake to make — so put your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to reject a petrol nozzle, and aftermarket devices are available for the remainder. Count it as a backstop, and keep reading the pump.
- As soon as you realise, stop: less petrol inside that tank makes a thinner blend. What to do next doesn't change, though — still do not fire it up.
Already put petrol in a diesel in Hawkwell?
In that case, there's just a short order of things. Do not fire it up, and do not switch the ignition on. Still at the forecourt, at Esso or anywhere else? Ask the attendants to help you roll the car away from the petrol pump. Then phone 0333 366 0103 and tell us what was put in, roughly how much, and if it has run.
Corrosion and deposits form the problem with AdBlue, where petrol means lost lubrication. So if it was AdBlue, say so — and read its own Hawkwell page.
Why one petrol in a diesel task around Hawkwell costs more than another
An honest single quote doesn't exist here: four situations, four separate tasks. The situation itself does most of the work of moving your cost. After that it is the share — how much petrol got in against how much your tank takes — and then where the vehicle is and whether a van can reach it safely.
Three questions come first, before any quote, rather than after — what went in, how much, has it run — and this is the reason. Those replies change a range into a straight figure.
About Hawkwell
Hawkwell is a village in Essex, situated approximately 4.4 miles northwest of Southend-on-Sea and 34.7 miles east of London. Hawkwell sits in a relatively low-lying area, with an elevation of around 30 metres, and is characterised by its semi-detached housing stock. Hawkwell is surrounded by other nearby places, including Mount Bovers, Hockley, and Stroud Green, and has a population of around 3010 residents.
Across Essex and around Hawkwell: fuel drain cover
Hawkwell rests in the SS postcode area, and our teams that answer petrol in diesel calls there work the spots around it as well — Mount Bovers, Hockley and Stroud Green among them. A forecourt, a supermarket car park, a lay-by or your own drive are all places our technicians drain, and your car doesn't need to come to us.
Still at the petrol pump in Hawkwell?
The best place there is, then — that's where you are. Switched off it remains; then call.