How Worried Should You Be? Petrol in a Diesel Car in Ashley Heath
Unstarted? Then less anxious than you likely are. Petrol resting in a diesel tank does nothing to your engine until something draws it through the system — the ignition priming the pump, the starter, or driving itself. So the honest answer to the first question anyone around Ashley Heath asks, "have I ruined it?", is usually no. To keep the car like that, phone Petrol in Diesel then leave the engine alone. Keep reading for three things: the effect petrol has inside a diesel engine, the clues of how far it has got, and ways to make sure you don't do it again.
Inside the engine: what petrol in a diesel does
Two jobs fall to diesel on its journey round a motor. Before it ignites, it lubricates — then it ignites. Made to extremely fine clearances, your injectors and the pump rely on your diesel moving through them to stop their surfaces wearing against one another.
Poorly at the first, not at all at the second: that's petrol. It's runnier than diesel and removes the protection the system hinges on, and so a pump running on a petrol mix 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.
Taken together, they make clear the shape the issue takes. Contact doesn't do the harm — circulation does. All a tank with petrol in it amounts to is a fuel problem. 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 fuel injectors downstream.
Four scenarios our engineers see around Ashley Heath: how serious is petrol in a diesel?
Fuelled up, not once started. The best case there can be. The petrol is inside the tank and just that tank, and the task is a drain and a flush where the car sits. This is the one scenario that can only really happen at a forecourt, since anywhere else the vehicle has been driven to get there.
Started for a moment, or just your ignition on. Once primed, the fuel system has pulled petrol out of your tank as far as your filter and your lines. Usually nothing more than draining, purging and seeing to the fuel filter, and so still straightforward.
Driven a few miles. Now your pump has spent these miles running on diluted fuel. How hard the vehicle was driven matters as much as how far, and the work takes in that tank, the fuel lines, the filter and fresh fuel through the whole system. On the school run to St Ives Primary & Nursery School, the mileage is small. Any mileage on the M27, under 15 miles from Ashley Heath, means the motor working hard throughout, and a run to Salisbury, under 25 miles away, is a very different job too.
Knocking, an uneven idle, smoke, a throttle gone soft: driven until it complained. That is your motor telling you its fuel has stopped behaving like diesel. Whether it's the verge on Hill Way, a lay-by or a side road, stop there and leave it. A car pulled over quickly very rarely has lasting damage, as the fuel drain and the flush, which still go first, sort it out.
What Ashley Heath drivers get told about petrol in a diesel — and the myths in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." A fuller tank of the same mix is all it gives, since topping up takes out nothing. A diesel fuel system does not tolerate petrol by percentage in the way that advice supposes.
"Current diesels can handle a little petrol" — a myth, and closer to the reverse. A newer diesel sends its fuel through smaller components at higher pressure, which makes the lubrication matter more, not less.
This is the one that catches people. Myth: "If it starts and drives, there's no damage done." The driver of a petrol motor fed diesel normally stops, because it will not run, and the harm stops there. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile the pump wears. Being able to run isn't proof of being fine.
Not so: a two-stroke additive makes it safe to drive home. It was an old workaround, meant for another issue. The petrol is still in your tank after that, and whatever it has thinned isn't put back.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol sits in the filter and lines, waiting to go right back through your pump at your next start. Clearing petrol into a can by the kerbside is also genuinely risky.
Petrol in a diesel: how does it occur?
Nobody does it on purpose, and it's rarely carelessness. 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, while a diesel nozzle mostly will not go into a petrol car at all. So the slip runs one way.
The moment habit stops matching your car is the moment it takes place. Courtesy car, hire car, or a motor that's new. A household with one petrol and one diesel on the drive. A well-known forecourt with the pumps in a different order. A train to catch, and a hurried fill on the way to Christchurch. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it occurs. Throw in rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
How to prevent petrol in a diesel on your next fill-up in Ashley Heath
- Check the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on each forecourt. The label is what matters.
- In a motor you don't know, look inside the flap over your filler or at the cap before your first fill: many vehicles print the fuel there.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, for a home with one of each.
- It sounds silly and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the petrol pump.
- Mistakes like this are simple to make while your mind is on something else, so the phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to reject a petrol nozzle, and aftermarket devices are available for the rest. Count it as a backstop, then keep checking the pump.
- Noticing it halfway? Stop at once. A weaker mix follows from less petrol in the tank, but your next stage stays the same: don't fire it up.
Put petrol in a diesel around Ashley Heath already?
The order of things is short, then. Do not switch your ignition on, and do not crank it. Ask the attendants to help you push it clear of the pump if you are still at the forecourt, whether that's BP or anywhere else. What was put in, roughly how much, and if it has run: tell us those when you phone 0333 366 0103.
If it was AdBlue and not petrol, say so. That's a separate fault — corrosion and deposits rather than lost protection — and it has its own page for Ashley Heath.
Ashley Heath petrol in a diesel jobs: why one costs more than another
An honest single quote does not exist here: four situations, four separate tasks. Which of them you're in is mostly what moves the cost. Where the car is matters too, and whether our van can safely get to it, after the ratio of petrol to what your tank holds.
That's why we ask three questions before costing rather than after: what went in, how much, and whether it's run. A range turns into a straight figure when the replies are in.
About Ashley Heath, for a moment
Ashley Heath is a small village in Dorset, situated inland at a low elevation of around 28 metres. Ashley Heath lies near the villages of St Leonards and St Ives, and is close to Woolsbridge, with the city of Salisbury approximately 16 miles away. Ashley Heath has a population of around 935 people, predominantly living in detached houses.
Fuel drain cover in Ashley Heath and across Dorset
St Leonards, St Ives and Woolsbridge are among the spots near Ashley Heath that the same teams work, answering petrol in diesel call-outs across Ashley Heath's BH postcode area. No need to bring the car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots where we work.
Still at the pump around Ashley Heath?
Then you're in the best spot there can be. Ring, and keep it turned off.