Should You Worry? Petrol in a Diesel Car in East Hanningfield
Far less than you likely are, provided it hasn't been started. Everyone around East Hanningfield begins with "have I ruined it?", and the honest answer is normally no: petrol resting inside that tank of any diesel remains harmless until priming, cranking or driving pulls it into your fuel system. Leave your engine off and call Petrol in Diesel — that is how you keep it that way. Further down, you will find what petrol actually 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 your engine?
On its way through a motor, diesel has two jobs. Before it ignites, it lubricates — then it ignites. Your high-pressure pump and your injectors are designed to extremely fine gaps, and your diesel passing through them is what stops those surfaces from grinding against each other.
Badly at the first, not at all at the second: that is petrol. The clattering comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips away the lubrication the fuel system rests on, and any pump running on such a blend is wearing itself.
Put those together and the shape of the trouble is plain. The damage is done by circulation, not by contact. Where the petrol is only inside that tank, it's an issue of fuel, nothing more. A pump that has been working on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with the fuel to the injectors further on.
How bad is petrol in a diesel? Four situations our engineers see in East Hanningfield
Fuelled up, never started. The best case there can be. That petrol is in that tank and just the tank, and the task is a drain and a flush where the car sits. This is the one scenario that can only truly happen on a forecourt, because anywhere else your car has been driven to get there.
Your ignition turned on, or a short start. Petrol has come out of the tank and reached the filter and your lines, since the fuel system has been bled. Drain, flush, deal with the fuel filter: still normally straightforward.
Driven a couple of miles. Now your pump has spent those miles running on weakened fuel. Miles is only half of it; how hard it was driven matters equally. Either way the work runs to that tank, your lines, your filter and clean fuel through the entire system. On the school run to East Hanningfield Church of England Primary Academy, the distance is small. Any mileage on the M25, under 15 miles from East Hanningfield, means the motor has worked hard throughout, and a run to Chelmsford, under 10 miles away, makes a very different task as well.
Rattling, an uneven idle, smoke, a throttle gone soft: driven until it complained. That is the motor telling you its fuel has stopped behaving like diesel. Whether it's the verge on The Common, 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 early, permanent damage is very rare.
Petrol in a diesel myths East Hanningfield drivers hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Topping up removes nothing; it gives you a fuller tank of the same mixture. The idea behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. At higher pressure, through finer components: that's how a modern diesel handles its fuel, so the lubrication counts for more, not less.
"It starts, it drives, so no harm done" — the myth that catches more people than any other. Diesel in a petrol motor usually leaves a motor that will not run: the driver stops, and so does the damage. Feed petrol to a diesel and it usually starts, idles and drives away as if nothing happened — all while its pump is wearing. Being able to run isn't proof of being fine.
An outdated fix for a different fault is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." What petrol has weakened remains diluted, and the petrol stays in the tank anyway.
If the motor has run, part of the petrol is in the fuel filter and the lines, not that tank — and your next start sends it right back through your pump. So the myth "drain your tank yourself and you're sorted" doesn't hold. Also, a can of petrol filled by the kerbside is truly hazardous.
How it happens: petrol in a diesel
It is seldom carelessness, and no one does it on purpose. One way only, because of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol car. That's how the forecourt makes it simple.
The moment routine stops matching your car is the moment it happens. A car that's new to you — hired, on loan as a courtesy car, or brand new. Two vehicles on one driveway, one petrol, one diesel. A forecourt you know, only with its pumps arranged differently. A train to catch, and a hurried fill en route to South Woodham Ferrers. The first fill-up in a diesel Volkswagen Tiguan after years of driving petrol is precisely the moment it takes place. With rain, a call coming in, or children to deal with, the hand simply does what it has always done.
How to avoid petrol in a diesel on your next fill-up around East Hanningfield
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most generally do. Read the pump's label; the colour is only a hint.
- Many vehicles state the fuel type inside the filler flap or on the cap, and so check it on your first fill in any vehicle you do not know.
- Good intentions count for less than a sticker or a fob in a bright colour on the diesel's key when a house has one of each. So mark it.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump. It sounds silly and it does the trick.
- Tuck your phone away. This is an easy mistake to make whilst you are thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to block a petrol nozzle, and add-on devices exist for motors without one. They are a backstop, not a reason to stop reading the petrol pump.
- Less petrol makes a weaker mixture, and so stop the moment you notice — while remembering that your next stage is unchanged. It is still not to fire it up.
East Hanningfield: already put petrol in a diesel?
Then, there is only a short order of things. Starting it is out, and so is switching on your ignition. The staff at the forecourt — whether at Esso itself or wherever you filled up — will normally help roll it away from the pump if you ask. What went in, about how much, and whether it's run: tell us those when you phone 0333 366 0103.
If it was AdBlue rather than petrol, say so. That is a separate fault — corrosion and deposits rather than lost protection — and it has its own page for East Hanningfield.
One petrol in a diesel job in East Hanningfield costs more than another. Why?
The four scenarios above are four different jobs, so no single quote for this would be fair. Mostly, the cost moves with which situation you're in. The share counts next, meaning how much of the tank is petrol, and then the location of the vehicle and whether reaching it is safe for our van.
That is why we ask three questions before costing rather than after: what went in, how much, and if it's run. Those replies are what change a range into one firm number.
About East Hanningfield
East Hanningfield is a village in Essex, situated approximately 5 miles from Chelmsford and 32 miles from London, with a population of around 931 people. East Hanningfield sits in a rural area at an elevation of 61 metres, surrounded by nearby places such as Great Claydons, Bicknacre, and Howe Green. East Hanningfield is characterised by its predominantly detached housing stock, reflecting its role as a residential community. East Hanningfield remains a small village with a strong sense of local identity.
Across Essex and around East Hanningfield: fuel drain cover
Great Claydons, Bicknacre and Howe Green are among the places near East Hanningfield that the same vans work, answering petrol in diesel jobs across East Hanningfield's CM postcode area. Our technicians drain wherever your car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
At the pump in East Hanningfield, right now?
The best spot there is, then — that's where you are. Leave it turned off, then ring.