Should You Worry? Petrol in a Diesel Car in Kings Heath
Far less than you likely are, if it has not been started. Till your ignition primes your pump, the starter turns, or your car is driven, petrol in a diesel tank just rests there and does nothing. Which means the honest reply to that first Kings Heath question — "have I wrecked it?" — usually no. Keep it like that: leave the motor off then call Petrol in Diesel. Below, you will find what petrol actually does inside a diesel, how far it may have gone, and how to stop it happening to you again.
The engine and petrol in a diesel: what happens
On its way through a motor, diesel does two jobs. It protects to begin with, and only then does it burn. Very fine gaps are built into the fuel injectors and the high-pressure pump, and only the diesel flowing through stops those surfaces grinding together.
Petrol handles the first job poorly and the second not at all. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump running on the blend to wear itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is where you hear the clattering.
Taken together, they make clear the shape the trouble takes. It's movement that does the damage, not contact. Where the petrol is only inside the tank, it's an issue of fuel, nothing more. Once your pump has been labouring on that petrol, a mechanical problem has begun: anything shed by a pump that's grinding travels onward to the fuel injectors with your fuel.
Four situations we see in Kings Heath: how serious is petrol in a diesel?
Filled up, and not started: no case is better. On a forecourt, and really only there, the petrol is still limited to the tank — because anywhere else the vehicle was driven to reach it. The job is draining and flushing on the spot.
Ignition on, or started for a moment. Once primed, the fuel system has drawn petrol from that tank as far as the fuel filter and the fuel lines. Drain, flush, see to the fuel filter: still normally straightforward.
Your pump now worked a couple of miles on diluted fuel — that's what driving the vehicle does. How hard your car was driven counts as much as how far, and the work takes in that tank, your lines, the fuel filter and fresh fuel through the whole system. Short trips, like the school run to Kings Heath Primary Academy, are one matter. Any mileage on the M1, under 5 miles from Kings Heath, means the engine has worked hard throughout, and a run to Milton Keynes, under 25 miles away, makes a very different job too.
Driven till it protested. Knocking, a lumpy idle, smoke, a throttle that has gone soft. What you are hearing is your engine signalling fuel that no longer acts like diesel. Pull up wherever you are — the verge on Mill Lane, a lay-by, a side street — then leave the vehicle where it is. A vehicle pulled over soon very seldom has lasting damage, as the fuel drain and the flush-through, which still come first, take care of it.
What Kings Heath motorists get told about petrol in a diesel — and the stories in it
Myth: topping up to full with diesel makes it fine. It doesn't. A fuller tank of the same mix is all it gives, since topping up removes nothing. That advice supposes a diesel fuel system handles petrol by percentage. It doesn't.
Myth: a modern diesel copes with a bit of petrol. Rather, the reverse. Protection counts more on modern diesels, not less, because their fuel passes through finer components at higher pressure.
The myth that catches people out: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it normally won't run, so the motorist stops — and the harm stops with them. Whilst your pump wears, a diesel fed petrol usually starts, idles and drives away as if nothing has happened. Fine and running are not the same thing.
An outdated workaround for a distinct fault is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." It does not put back what petrol has diluted, and the petrol is still inside your tank later.
Myth: "Drain that tank yourself and you're sorted." Once the engine has run, some of that petrol is no longer in your tank: it's in the fuel filter and the fuel lines, and it goes straight back through your pump on your next start. Draining petrol into a can at the roadside is also really hazardous.
How petrol ends up: petrol in a diesel
On purpose? Never. Through carelessness? Seldom, if ever. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle generally won't go into a petrol car at all. So the slip runs one way.
When habit and the car stop matching, it occurs. A new car, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. A forecourt you know, but with its pumps arranged differently. Racing for a train outside Northampton and filling up en route. Years of petrol cars behind you, a diesel Volkswagen Golf in front of you at the forecourt for its first tank — that's when. With rain, a call coming in, or a car full of children to deal with, your hand just does what it always has.
Preventing petrol in a diesel next time you fill up around Kings Heath
- A green handle for unleaded and black for diesel is usual in the UK — but not on each forecourt. Go by the label on the pump, not the colour.
- Many motors state the fuel inside the filler flap or on the cap, so check there on the first fill in a car you do not know.
- One of each in the household? Mark the key to the diesel — a bright fob, a sticker — because intending to remember is not enough.
- "Diesel", aloud, before you pick up the nozzle — each time a new or hired car gets its first tank. It sounds silly. It works.
- Put your phone away. This is an easy mistake to make while you are thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject a petrol nozzle, and add-on devices are available for vehicles without one. They are a backstop, not a reason to stop reading the petrol pump.
- Noticing it halfway? Stop there and then. A thinner blend follows from less petrol in that tank, yet your next stage stays the same: do not crank it.
Already put petrol in a diesel around Kings Heath?
The order of things is short, then. Starting it is out, and so is turning on your ignition. If you're still at the forecourt — BP or anywhere else — ask the attendants to help you push the vehicle clear of the petrol pump. Next, 0333 366 0103. We will ask what went in, about how much, and if it has been run.
Corrosion and deposits form the issue with AdBlue, where petrol means lost lubrication. So if it was AdBlue, say so — and see its own Kings Heath page.
Kings Heath petrol in a diesel tasks: why one costs more than another
An honest single price doesn't exist here: four scenarios, four separate tasks. Mostly, your cost shifts with which one you are in. The ratio counts next, meaning how much of the tank is petrol, and then the position of the vehicle and whether getting to it is safe for our van.
What went in, how much, and whether it has run — three queries our technicians ask before costing, not after, for exactly that reason. Given the answers, you get a straight figure rather than a range.
About Kings Heath itself
Kings Heath is a suburban area in Northamptonshire, situated on the banks of a river at an elevation of 86 metres. Kings Heath lies approximately 61 miles northwest of London and 16 miles southeast of Milton Keynes, with nearby places including Dallington, Kingsthorpe, and Queens Park. Kings Heath is characterised by its predominantly semi-detached housing stock, reflecting the typical residential architecture of the East Midlands region. Kings Heath has a population of around 5592 residents, making it a moderately sized suburban community.
Kings Heath and Northamptonshire: where our fuel drain cover runs
Petrol in diesel calls around Kings Heath — part of the NN postcode area — go to vans that also cover the locations around it, Dallington, Kingsthorpe and Queens Park among them. You need not move the car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places we drain.
At the petrol pump around Kings Heath, right now?
The best place there is, then — that is where you are. Turned off it stays; then call.