Should You Worry? Petrol in a Diesel Car in Tidworth
If it hasn't been started, you can worry far less than you likely are. "Have I ruined it?" is the first question everyone in Tidworth asks, and the honest answer is generally no, since petrol left in a diesel tank hurts nothing until it is dragged through your fuel system — by ignition priming, by the starter, or by driving. Keep it that way: leave your motor off then phone Petrol in Diesel. Keep reading for three things: the effect petrol has inside a diesel engine, the signs of how far it has got, and the way to make sure you don't repeat it.
Inside the motor: what petrol in a diesel really does
Two tasks fall to diesel on its route round a motor. Lubricating comes before burning; it does both. The high-pressure pump and the fuel injectors are designed to extremely fine tolerances, and the diesel passing through them is what stops those surfaces from wearing down against each other.
Petrol does the first task badly and the second not at all. A pump running on a petrol mix is wearing itself out, since petrol is thinner than diesel and takes away the lubrication your fuel system relies on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that is where any clattering starts.
The shape of the trouble is plain when you put those together. Contact does not do the damage — circulation does. All a tank with petrol in it amounts to is a fuel issue. Whatever a worn pump sheds goes on, borne by your fuel, into your injectors downstream, which is why a pump that has been working on that petrol is where a mechanical issue starts.
Tidworth, petrol in a diesel: four cases, from mild to major
Filled up, and not started: no case is better. Just that tank has petrol in it, so the task is clearing your tank and flushing your system where the car sits. This scenario can only truly occur at a forecourt: anywhere else, the vehicle got there by being driven.
The ignition switched on, or a short start. Petrol has left that tank and got to the filter and your lines, since the system has been primed. Drain, flush, deal with your filter: still normally straightforward.
A few miles driven, and the pump has spent every one of them working on thinned fuel. How hard the vehicle was driven matters as much as how far, and this work covers the tank, your lines, your filter and clean fuel through the entire system. The school run to Clarendon Junior School (Clarendon Federation) is one thing. Driving as far as Salisbury, under 15 miles away, makes a very different task — as does any distance on the M4, under 25 miles from Tidworth, with the engine labouring hard all the way.
Driven until it complained. Knocking, a lumpy idle, smoke, a throttle that has gone soft. The motor is telling you your fuel is no longer behaving like diesel. Pull up on the spot — on the verge on Ludgershall Road, at the kerb, down a side road — and don't move it again. A car stopped quickly very seldom has lasting damage, as the drain and the flush-through, which still come first, sort it out.
Stories Tidworth motorists hear about petrol in a diesel
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing is removed when you top up — your tank just carries more of the same mixture. The idea behind the guidance — that diesel fuel systems accept petrol by percentage — is wrong.
"Current diesels can handle a little petrol" — a myth, and closer to the opposite. More precise components and higher pressure are how a current diesel runs its fuel, and that makes the protection count more, not less.
This is the one that fools people. Myth: "If it starts and drives, there's no harm done." Diesel in a petrol motor generally means a motor that won't run: the driver stops, and so does the damage. A diesel fed petrol usually starts, idles and drives away as if nothing has happened, whilst your pump grinds. Running doesn't mean fine.
Myth: a two-stroke additive makes it safe to drive home. It was an old workaround, supposed for another fault. None of what petrol diluted gets put back by it — and later, that tank still holds that petrol.
If the motor has run, part of the petrol is in the filter and your lines, not your tank — and the next start pulls it right back through your pump. So the myth "drain the tank yourself and you're sorted" doesn't hold. It is also genuinely dangerous to drain petrol into a can by the roadside.
Petrol in a diesel: how does it occur?
It is rarely carelessness, and nobody does it on purpose. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle generally will not go into a petrol motor at all. So the mistake runs one way.
It takes place when habit and the car stop matching. A new car, a hire car or a courtesy car. Households running one of each, petrol and diesel. Your ordinary forecourt, its pumps suddenly in a different order. A hurried fill en route to Grateley with a train to catch. A new-to-you diesel Volkswagen Passat, its first fuelling, and a motorist accustomed to petrol: exactly when it takes place. The hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
How to avoid petrol in a diesel at your next fill-up around Tidworth
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most usually do. Check the petrol pump's label; the colour is just a hint.
- The first fill in a strange vehicle is the time to check your filler flap — inside it, or on the cap, many cars state which fuel they take.
- 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 intending to remember.
- Before the nozzle comes off the petrol pump the first time you fuel a hired or new car, say "diesel" out loud. Silly, yes, yet it does the trick.
- While you are thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to block a petrol nozzle, and aftermarket devices are available for the remainder. Count it as a safety net, then keep reading the petrol pump.
- Less petrol means a weaker mixture, and so stop the moment you notice — while remembering that the next step is unchanged. It's still not to crank it.
Petrol already in a diesel in Tidworth? Begin here
Then the order of things is short. Don't start the vehicle, and do not switch the ignition on. If you're still at the forecourt — Esso or anywhere else — ask the attendants to help you roll it clear of the pump. Call 0333 366 0103 next, with three answers — the fuel, the approximate volume, and whether it has run.
Say so if it was AdBlue instead of petrol: it's a different problem, with its own page for Tidworth, because AdBlue brings corrosion and deposits rather than lost protection.
One petrol in a diesel job around Tidworth costs more than another. Why?
There is no honest single quote for this, since the four situations above are four separate jobs. The scenario itself does most of the work of moving the cost. Two things follow that: the petrol that got in as a share of what that tank takes, then the place the vehicle is in and whether a van can reach it safely.
Before any quote, not after, come three queries: your fuel that was put in, the volume, and whether it's run. That's why. A range turns into a straight figure once the answers are in.
About Tidworth itself
Tidworth is a town situated in the county of Wiltshire, in the South West region of England, with a riverside setting and an elevation of 111 metres. Tidworth lies near the city of Salisbury, approximately 13 miles away, and is also close to the nearby places of North Tidworth and South Tidworth. Tidworth has a population of around 9899 people and predominantly consists of semi-detached housing. Tidworth is located about 68 miles from London, making it a commuter town for some residents.
Across Wiltshire and around Tidworth: fuel drain cover
Our vans answering petrol in diesel call-outs around Tidworth, in the SP postcode area, equally work the places around it, North Tidworth, South Tidworth and Tidworth Camp among them. No need to bring your car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots where we work.
In Tidworth and still at the pump?
Then you are in the best position there is. Call, and keep it switched off.