Should You Worry? Petrol in a Diesel Car in Ham
Far less than you probably are, if it hasn't been started. Everyone around Ham starts with "have I ruined it?", and the fair answer is normally no: petrol resting inside that tank of any diesel stays harmless till priming, cranking or driving draws it into the system. Petrol in Diesel is who to phone, with your motor left off, so it stays that way. Below, you will find what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you again.
The motor and petrol in a diesel: what goes on
On its way through an engine, diesel does two jobs. Oiling comes before burning; it does both. Your high-pressure pump and the injectors are designed to extremely fine gaps, and the diesel passing through them is what stops those surfaces from wearing down against each other.
Poorly at the first, not at all at the second: that is petrol. A pump running on a petrol blend 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's where the rattling starts.
Put those together and the shape of the problem is clear. Contact doesn't do the harm — circulation does. Petrol in the tank is a fuel fault. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with the fuel to the injectors downstream.
Petrol in a diesel around Ham: how serious is it? Four cases
Fuelled, and not started: nothing beats it. Just your tank has petrol in it, and so the job is clearing your tank and rinsing the fuel system where the car sits. This scenario can only really take place on a forecourt: anywhere else, the vehicle got there by being driven.
Started for a second, or just the ignition on. Once primed, the system has pulled petrol from that tank as far as the filter and the fuel lines. Drain, flush, see to the filter: still usually simple.
A few miles driven, and the pump has spent each of them working on thinned fuel. Tank, lines, filter, then fresh fuel put through the entire system: that's this work, and the way the car was driven counts as much as the distance. Short trips, such as the school run to St Mary the Virgin Church of England Primary School, are one matter. Very different once more: a run to Salisbury, under 25 miles away, or any miles on the M27, under 50 miles from Ham, where your engine never stopped running hard.
Driven till it protested. Clattering, a ragged idle, smoke, a throttle that has gone soft. The engine is telling you your fuel is no longer behaving like diesel. Whether it is the verge on B3081, a lay-by or a side street, stop there then leave it. The fuel drain and flush-through still come first, and they deal with it: when a vehicle is pulled over soon, lasting damage is very unusual.
Myths Ham drivers hear about petrol in a diesel
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. Nothing is removed by topping up — you're left with a fuller tank, still the same mix. A diesel fuel system does not accept petrol by percentage in the way that guidance assumes.
Myth: a modern diesel copes with a bit of petrol. Rather, the opposite. A current diesel sends its fuel through more precise parts at higher pressure, which makes the protection matter more, not less.
One myth that catches people off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it generally will not run, and so the motorist stops — and the damage stops with them. Feed petrol to a diesel and it normally starts, idles and drives away as if nothing happened — all the while its pump is wearing. A running engine doesn't mean fine.
Not so: a two-stroke additive makes it safe to drive home. It was an old workaround, supposed for another issue. None of what petrol diluted is put back by it — and afterwards, that tank still contains that petrol.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol lies in the fuel filter and lines, waiting to go right back through the pump on your next start. It's also truly risky to drain petrol into a can at the roadside.
How it happens: petrol in a diesel
On purpose? Never. Through carelessness? Seldom, if ever. The petrol nozzle is the narrower of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol car at all. The forecourt makes it easy, and the error runs one way.
It happens when routine and your car stop matching. Courtesy car, hire car, or a motor that's brand new. Two vehicles on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A rushed fill on the way to Gillingham (Dorset) with a train to catch. The first fill-up in a diesel Renault Megane after years of driving petrol is exactly the moment it occurs. With rain, a call coming in, or a car full of children to deal with, your hand simply does what it has always done.
How to prevent petrol in a diesel at your next fill-up in Ham
- Green for unleaded and black for diesel is normal in the UK — but not on each forecourt. Go by the label on the petrol pump, not the colour.
- In a vehicle you don't know, look inside the flap over your filler or at the cap before the first fill: many cars 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 house with one of each.
- Before the nozzle leaves the petrol pump the first time you fuel a hired or new vehicle, say "diesel" aloud. Daft, yes, yet it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, so tuck your phone away and keep your mind on the petrol pump.
- Add-on devices exist for cars without one, and some diesels are built with a filler that will not accept a petrol nozzle. Helpful — but a safety net only, never a reason to stop checking the label.
- Stop the moment you notice. Less petrol in your tank means a weaker blend. It does not change what to do next, which is still not to fire it up.
Ham: already put petrol in a diesel?
Then the order of things is brief. Leave it unstarted, with your ignition switched off as well. Still at the forecourt, at Shell or anywhere else? Ask the staff to help you push the vehicle away from the pump. Next, 0333 366 0103. We'll ask what went in, roughly how much, and if it has been run.
Say so if it was AdBlue instead of petrol: it's a separate problem, with its own page for Ham, since AdBlue brings corrosion and deposits rather than lost lubrication.
Ham petrol in a diesel jobs: why one costs more than another
There's no fair single price for this, since the four situations above are four separate tasks. The scenario itself does most of the work of moving your cost. Next it's the proportion — how much petrol was put in against how much the tank takes — and after that where your car is and whether a technician can reach it safely.
Before any quote, not after, come three questions: the fuel that went in, the amount, and whether it's run. That's why. A range becomes a straight figure when those answers are in.
About Ham
Ham is a suburban area in Dorset, situated on the riverside with an elevation of 71 metres, and is located near Ham Common and other local places like Madjeston and Gillingham. Ham has a population of around 1706 people and features predominantly semi-detached housing. Ham is positioned approximately 20 miles from Salisbury and about 98 miles from London, making it a relatively rural suburb in the South West region. Ham sits in a scenic area with nearby natural spaces.
Ham and Dorset: where our fuel drain cover runs
Petrol in diesel calls around Ham — part of the SP postcode area — go to vans that likewise cover the locations about it, Ham Common, Madjeston and Gillingham included. A forecourt, a supermarket car park, a lay-by or your own driveway are all places we drain, and the vehicle doesn't need to move to us.
At the petrol pump in Ham, right now?
Nothing beats it: that's where you are. Keep it off. Phone.