How Worried Should You Be? Petrol in a Diesel Car in Hevingham
Far less than you probably are, if it has not been started. Until your ignition primes your pump, the starter turns, or the vehicle is driven, petrol in a diesel tank just rests there and does no harm. Which means the truthful reply to the first Hevingham query — "have I ruined it?" — normally no. Keep it that way: leave the engine off then call Petrol in Diesel. 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.
Inside your engine: what petrol in a diesel does
Passing through a motor, diesel does two jobs at the same time. Before it burns, it lubricates — and then it ignites. Extremely fine tolerances are built into the fuel injectors and your high-pressure pump, and only your diesel running through keeps their surfaces from grinding together.
The second job petrol doesn't do at all, and the first it does badly. The knocking 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 out the protection the system rests on, and any pump running on that blend is wearing itself.
The shape of the problem is plain when you put those together. The harm is done by circulation, not by contact. All a tank with petrol in it amounts to is a fuel issue. After the pump has been working on that petrol, a mechanical issue has begun: anything shed by a pump that's wearing down is carried onward to your injectors with the fuel.
How serious is petrol in a diesel? Four scenarios we see in Hevingham
Fuelled but never started — as good as it gets. Only that tank has petrol in it, and so the job is draining that tank and flushing the fuel system where your car sits. This scenario can only truly take place at a forecourt: anywhere else, your car got there by being driven.
Your ignition switched on, or a short start. Petrol has come out of the tank and got to the fuel filter and your lines, because your system has been primed. Drain, flush, see to the fuel filter: still usually straightforward.
Those few miles on the road were your pump working on fuel weakened by petrol the whole way. Distance is only half of that; how hard it was driven matters equally. Either way this work includes your tank, your lines, the fuel filter and clean fuel through the entire system. A school run to Hevingham Primary School is one matter. Driving as far as Norwich, under 10 miles away, makes a very different task — as does any distance on the M11, over 50 miles from Hevingham, with your engine working hard the whole time.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. That is the engine telling you its fuel has stopped behaving like diesel. Whether it is the verge on The Street, a lay-by or a side road, stop there and leave it. What goes first is still the drain and flush-through, and that sorts it out, with permanent damage very rare when a vehicle is pulled over early.
What Hevingham drivers get told about petrol in a diesel — and the myths in it
False: topping up to full with diesel makes it fine. It does not. Nothing is removed by topping up — you're left with a bigger tank, still the same mixture. Percentage isn't how a diesel fuel system copes with petrol, however much that advice assumes.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through more precise components: that's how a newer diesel handles its fuel, so the protection counts more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that catches people. The driver of a petrol motor fed diesel usually has no choice but to stop, since it will not run, and the damage stops with them. A diesel fed petrol usually starts, ticks over and drives away as though nothing has happened, whilst your pump grinds. Being able to run isn't the same as being fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an old workaround for a separate problem. It doesn't put back what petrol has weakened, and the petrol is still inside the tank later on.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol lies in the filter and lines, ready to go right back through the pump on your next start. It is also truly risky to drain petrol into a can at the roadside.
How it happens: petrol in a diesel
Nobody does it on purpose, and it is seldom carelessness. 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 won't fit a petrol vehicle. That's how the forecourt makes it easy.
The moment habit stops matching the car is the moment it occurs. A new car, a hire car or a courtesy car. One petrol and one diesel on the drive of the same household. Your normal forecourt, its pumps now in a different order. Filling up in a rush on the way to Worstead, with a train to catch. Precisely the moment it takes place: after years of driving petrol, a driver fills a diesel Skoda Octavia for the first time. Throw in rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
How to avoid petrol in a diesel at your next fill-up around Hevingham
- Read the pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on each forecourt. The label is what counts.
- Inspect the filler flap. Plenty of cars state the fuel type inside the flap or on the cap. Look at it on the first fill in a motor you don't know.
- Mark the key. In a home with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- 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 petrol pump. It seems silly and it works.
- Mistakes like this are straightforward to make while your mind is on something else, and so your phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to refuse a petrol nozzle, and add-on devices exist for vehicles without one. They are a safety net, not a reason to stop reading the pump.
- The moment you realise, stop: less petrol inside the tank makes a weaker blend. What to do next doesn't change, though — still don't crank it.
Already put petrol in a diesel around Hevingham?
Then the order of things is short. Starting it is out, and so is turning on your ignition. Ask the staff to help you push it away from the petrol pump if you're still on the forecourt, whether that is Gulf or somewhere else. What was put in, about how much, and if it's run: tell us those when you ring 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a different issue — Hevingham has a page all for it.
Hevingham petrol in a diesel tasks: why one costs more than another
There's no fair single quote for this, because the four scenarios above are four separate jobs. What shifts the cost is mostly which of them you are in. Where your car is counts too, and whether a van can safely get to it, after the proportion of petrol to what the tank takes.
What got in, how much, and if it has run — three questions our engineers ask before pricing, not after, for exactly that reason. A range becomes a straight figure once the replies are in.
About Hevingham
Hevingham is a village in Norfolk, situated approximately 8 miles northwest of Norwich, and Hevingham sits in a relatively low-lying area at an elevation of around 19 metres. Hevingham is characterised by its predominantly detached housing stock and Hevingham has a number of nearby settlements, including Pound Corner and Westgate Street. Hevingham remains a small, rural community with a population of around 1039 residents.
Hevingham and Norfolk: where our fuel drain cover reaches
Hevingham rests in the NR postcode area, and our teams that answer petrol in diesel jobs there work the locations near it as well — Pound Corner, Westgate Street and The Heath among them. Our technicians drain where the 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 Hevingham, right now?
Then, you couldn't be in a better spot. Keep the car switched off, and ring.