How Worried Should You Be? Petrol in a Diesel Car in Woolavington
Not started? Then less anxious than you probably feel. Till your ignition primes your pump, your starter cranks, or the vehicle is driven, petrol in a diesel tank just rests there and does nothing. Which makes the honest reply to that first Woolavington question — "have I wrecked it?" — normally no. Leave the engine off then call Petrol in Diesel — that keeps it that way. Below, 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.
Inside the engine: what petrol in a diesel does
Passing through an engine, diesel does two jobs at once. Before it combusts, it lubricates — and then it ignites. Designed to extremely fine clearances, your injectors and your pump depend on your diesel moving through them to stop their surfaces wearing against one another.
Of these two jobs, petrol handles the first poorly and the second never. It is runnier than diesel and takes away the lubrication the fuel system rests on, so a pump running on a petrol blend is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That's where the knocking comes from.
Seen together, they make clear the shape the trouble takes. The damage is done by circulation, not by contact. Any tank with petrol in it is a fuel issue. Whatever a worn pump sheds travels on, carried by the fuel, into your injectors downstream, which is why a pump that has been working on the petrol is where a mechanical problem begins.
Petrol in a diesel in Woolavington: how bad is it? Four cases
Filled up, not once started. The best case there can be. Only that tank has petrol in it, so the task is draining that tank and cleaning the fuel system where your car sits. This situation can only really happen on a forecourt: anywhere else, the car got there by being driven.
Started for a moment, or only the ignition on. The fuel system has been primed, so petrol has left the tank and got to the filter and the lines. That's usually still an easy task — a drain, a flush, and the fuel filter seen to.
Your pump has worked a few miles on thinned fuel — that's what driving the car meant. The work is your tank, the fuel lines, your filter and clean fuel through the entire circuit, and how hard the vehicle was driven counts as much as how far. Driving the kids to Woolavington Village Primary School is one sort of trip. Very different again: a run to Wells, under 15 miles away, or some mileage on the M5, under 3 miles from Woolavington, where the motor never stopped running hard.
Knocking, a lumpy idle, smoke, a throttle gone soft: driven until it complained. The fuel isn't acting like diesel any more, and the motor is saying so. Leave it wherever it stops: a lay-by, a side street, the verge on Church Street. What goes first is still the fuel drain and flush, and that sorts it out, with permanent damage very uncommon when a car is pulled over early.
Woolavington drivers and that petrol in a diesel stories they hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up removes nothing; it gives you a bigger tank of the same mix. The assumption behind the guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: a newer diesel copes with a bit of petrol. Rather, the opposite. At higher pressure, through more precise components: that's how a newer diesel handles its fuel, and so the protection matters more, not less.
Myth: "If it starts and drives, there's no harm done." This is the one that fools people. Feed diesel to a petrol engine and it usually will not run, and so the driver stops — and the harm stops with them. A diesel fed petrol normally starts, ticks over and drives away as though nothing has happened, while the pump grinds. Running is not the same as fine.
An outdated workaround for a distinct fault lies behind this one. Myth: "Add some two-stroke oil and drive it home." That petrol is still inside the tank afterwards, and what it has weakened isn't put back.
The next start draws petrol back round the pump from the fuel lines and your filter, where some of it sits once the motor has been run. That's why draining the tank yourself does not leave you sorted — a myth. On top of that, petrol cleared into a can by the road is truly risky.
Petrol in a diesel: how does it occur?
On purpose? Never. Through carelessness? Rarely, if ever. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol car at all. The forecourt makes it easy, and the slip runs one way.
The moment routine stops matching the vehicle is the moment it occurs. A new car, a hire car or a courtesy car. Two cars on one driveway, one petrol, one diesel. A forecourt you know, but with its pumps arranged differently. Filling up in a hurry en route to Highbridge & Burnham, with a train to catch. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it takes place. With rain, a call arriving, or a car full of children to deal with, your hand just does what it always has.
How to avoid petrol in a diesel at your next fill-up around Woolavington
- The label is what matters, and so read the pump instead of the colour: in the UK unleaded handles are normally green and diesel black, but not on every forecourt.
- The first fill in a new vehicle is the time to check the filler flap — on it, or on the cap, many cars state which fuel they take.
- Label 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.
- Before the nozzle comes off the pump the first time you fill a hired or new vehicle, say "diesel" out loud. Silly, yes, yet it does the trick.
- Tuck your phone away. This is an easy mistake to make while you're thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to block a petrol nozzle, and add-on devices are available for cars without one. They are a safety net, not a reason to stop checking the pump.
- As soon as you notice, stop: less petrol inside the tank means a thinner mixture. What to do next does not change, though — still do not start the vehicle.
Already put petrol in a diesel in Woolavington?
Short and simple, then, is the order of things. Don't start the car, and don't switch the ignition on. The attendants on the forecourt — whether at Murco itself or wherever you filled up — will normally help push it away from the petrol pump if you ask. Next, 0333 366 0103. We will ask what was put in, about how much, and if it's been run.
If it was AdBlue and not petrol, say so. That's a different fault — corrosion and deposits and not lost lubrication — and it has its own page for Woolavington.
What makes one Woolavington petrol in a diesel job cost more than the next
There's no honest single price for this, because the four scenarios above are four different tasks. Which of them you are in is mostly what moves the cost. Beyond that it's the share — how much petrol was put in against how much the tank holds — and after that where the vehicle is and whether our van can reach it safely.
That is why our engineers ask three questions before quoting instead of after: what was put in, how much, and whether it's run. Those replies are what change a range into one firm number.
About Woolavington, briefly
Woolavington is a small village in inland Somerset, situated near the villages of Cossington, Bawdrip, and Knowle. Woolavington lies at an elevation of around 16 metres, approximately 12.7 miles from the city of Wells. Woolavington has a population of around 1055 people, predominantly living in detached houses. Woolavington is located in the South West region, about 123.4 miles from London.
Woolavington and Somerset: where our fuel drain cover reaches
Woolavington rests in the TA postcode area, and our vans that answer petrol in diesel call-outs there work the spots around it as well — Cossington, Bawdrip and Knowle among them. The car doesn't need to come to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the pump around Woolavington?
The best position there is, then — that is where you are. Phone, and keep it switched off.