Should You Worry? Petrol in a Diesel Car in Dosthill
Unstarted? Then less worried than you likely are. Till the ignition primes the pump, the starter cranks, or your car is driven, petrol in a diesel tank just sits there and does nothing. Which makes the honest reply to the first Dosthill question — "have I ruined it?" — normally no. Keep it that way: leave your engine off and ring Petrol in Diesel. Keep reading for three things: the effect petrol has inside a diesel motor, the signs of how far it has spread, and the way to make sure you don't do it again.
Petrol in a diesel: what does it do to your engine?
Two jobs fall to diesel on its journey round a motor. It ignites, and before it burns it lubricates. What keeps the surfaces inside the high-pressure pump and your injectors from wearing down against each other is the diesel flowing through them — they are designed to extremely fine gaps.
Badly at the first, not at all at the second: that's petrol. It is runnier than diesel and takes away the lubrication your fuel system rests on, 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 is where the rattling comes from.
Put these together and the shape of the problem is plain. Contact does not do the damage — movement does. Where that petrol is only in that tank, it's a problem of fuel, nothing more. The beginning of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds moves on with the fuel to the injectors beyond it.
Petrol in a diesel around Dosthill: how serious is it? Four cases
Fuelled but never started — as good as it gets. The petrol is in that tank and just that tank, and the task is a drain and a flush where the vehicle sits. This is the one scenario that can only truly happen on a forecourt, as anywhere else your car has been driven to get there.
Ignition on, or started for a second. With the system primed, your lines and filter now contain petrol that came from your tank. Drain, flush, see to your filter: still normally simple.
Those few miles on the road were your pump working on fuel weakened by petrol throughout. Mileage is only half of that; how hard it was driven matters just as much. Either way the work runs to your tank, your lines, the filter and fresh fuel through the entire system. Driving the children to Dosthill Primary School is one sort of trip. A run as far as Lichfield, under 10 miles away, is a very different task. So is any mileage on the M42, under 3 miles from Dosthill, where the motor has been working hard throughout.
Clattering, a ragged idle, smoke, a throttle gone soft: driven until it complained. The fuel isn't behaving like diesel any more, and the engine is telling you. Stop where you are — on the verge on Hedging Lane, at the kerb, down a side road — and don't move it. The fuel drain and flush-through still go first, and they deal with it: when a car is pulled over quickly, lasting damage is very unusual.
Stories Dosthill people hear about petrol in a diesel
Myth: topping up to full with diesel makes it fine. It does not. A bigger tank of the same mix is all it gives, since topping up removes nothing. Percentage isn't how a diesel fuel system copes with petrol, however much that advice presumes.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the reverse. More precise parts and higher pressure are how a current diesel runs its fuel, and that makes the lubrication count more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that fools motorists. Feed diesel to a petrol engine and it normally won't run, and so the motorist stops — and the damage stops with them. Feed petrol to a diesel and it usually fires up, idles and drives away like nothing happened — all while its pump is wearing. Being able to run is not proof of being fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct problem. None of what petrol diluted gets put back by it — and afterwards, your tank still holds the petrol.
The next start sends petrol back round your pump out of the lines and your filter, where some of that sits once your engine has run. That's why a DIY tank drain does not leave you sorted — a myth. It is also really hazardous to drain petrol into a can at the roadside.
How petrol ends up: petrol in a diesel
Nobody does it on purpose, and it's seldom carelessness. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol vehicle at all. The forecourt makes it simple, and the mistake runs one way.
When habit and the vehicle stop matching, it happens. Any car that is new to you — hired, on loan as a courtesy car, or brand new. Two vehicles on one driveway, one petrol, one diesel. A familiar forecourt with the pumps in a different order. A train to catch, and a rushed fill on the way to Wilnecote. A new-to-you diesel BMW 3 Series, its first fuelling, and a driver used to petrol: precisely when it takes place. Add a back seat full of children, a phone call or rain, and habit takes over.
Dosthill motorists: how to prevent petrol in a diesel next time
- Check the petrol pump, not the colour. In the UK unleaded handles are generally green and diesel black, but not on each forecourt. The label is what counts.
- In a car you do not know, look inside the flap over your filler or at the cap before your first fill: plenty of vehicles print the fuel type there.
- Good intentions count for less than a sticker or a fob in a bright colour on the diesel's key when a home has one of each. So label it.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the petrol pump. It seems daft and it does the trick.
- Tuck the phone away. This is an easy mistake to make while you are thinking about something else.
- Some diesels have a filler built to reject a petrol nozzle, and devices you can add are available for vehicles without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump.
- Less petrol makes a weaker mixture, and so stop as soon as you realise — while remembering that the next step is unchanged. It's still not to fire it up.
Already put petrol in a diesel around Dosthill?
Then the order of things is brief. Leave it unstarted, with the ignition off as well. The attendants on the forecourt — whether at Esso itself or wherever you filled up — will usually help push it away from the petrol pump if you ask. What went in, about how much, and if it's run: tell us that when you call 0333 366 0103.
Say so if it was AdBlue rather than petrol: it's a different fault, with its own page for Dosthill, since AdBlue brings corrosion and deposits rather than lost protection.
Why one petrol in a diesel task in Dosthill costs more than another
There's no honest single quote for this, because the four situations above are four different tasks. The scenario itself does most of the work of moving your cost. Where the vehicle is counts too, and whether a technician can safely reach it, after the ratio of petrol to what your tank takes.
What went in, how much, and if it has run — three questions we ask before costing, not after, for exactly that reason. A range becomes a straight figure when those answers are in.
About Dosthill, briefly
Dosthill is a suburban area in Staffordshire, situated on the riverside at an elevation of 69 metres, with semi-detached housing being the predominant type of accommodation. Dosthill lies approximately 8.4 miles from the city of Lichfield and is close to nearby places such as Two Gates, Hockley, and Whateley. Dosthill has a population of around 4665 residents and is located about 100.3 miles northwest of London. Dosthill forms part of the wider West Midlands region, with its riverside setting providing a distinctive character to the area.
Fuel drain cover in Dosthill and across Staffordshire
Two Gates, Hockley and Whateley are among the places around Dosthill that the same vans work, answering petrol in diesel jobs across Dosthill's B postcode area. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots our technicians drain, and the car doesn't need to come to us.
Still at the petrol pump around Dosthill?
Then you are in the best position there is. Keep it off. Ring.