Petrol in a Diesel Car in Turpin Green: How Worried Should You Be?
If it hasn't been started, you can worry less than you likely are. Until the ignition primes your pump, your starter turns, or the vehicle is driven, petrol in a diesel tank just rests there and does no harm. Which means the honest reply to the first Turpin Green query — "have I wrecked it?" — usually no. Keep it like that: leave your engine off and ring Petrol in Diesel. Further down, 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.
Petrol in a diesel: what does it do to the engine?
Diesel has two jobs on its way through a motor. Before it ignites, it lubricates — and then it burns. What stops the surfaces inside your high-pressure pump and the fuel injectors from wearing down against one another is your diesel passing through them — they're built to very fine gaps.
The second task petrol does not do at all, and the first it does poorly. The knocking comes from petrol being made not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips away the protection the fuel system depends on, and any pump working on such a mix is wearing itself.
Taken together, they show what shape the issue takes. Contact does not do the harm — movement does. Where that petrol is only inside the tank, it is a fault of fuel, nothing more. Once the pump has been labouring on that petrol, a mechanical fault has begun: anything shed by a pump that's grinding is carried downstream to the injectors with the fuel.
Four situations our engineers see in Turpin Green: how serious is petrol in a diesel?
Filled but not once started — as good as it gets. Only that tank has petrol in it, and so the job is draining the tank and rinsing your system where your car stands. This situation can only truly happen at a forecourt: anywhere else, the car got there by being driven.
Ignition on, or started for a second. Your system has been primed, and so petrol has left that tank and reached the fuel filter and your lines. Usually little more than emptying, rinsing and sorting the fuel filter, so still straightforward.
Those few miles on the road meant your pump running on fuel weakened by petrol the whole way. Mileage is only half of it; how hard it was driven matters just as much. Either way the work runs to your tank, the fuel lines, the filter and clean fuel through the whole system. A school run to Leyland Methodist Junior School is one matter. A run as far as Preston, under 5 miles away, is a very different job. So is any mileage on the M6, under a mile from Turpin Green, where the motor has been running hard the whole time.
Driven till it protested. Rattling, an uneven idle, smoke, a throttle that has gone soft. The fuel isn't acting like diesel any more, and your engine is telling you. Whether it's the verge on Turpin Green Lane, a lay-by or a side street, stop there then leave it. Lasting damage is very unusual if a vehicle is pulled over early, and the fuel drain and flush that still come first deal with it.
Stories Turpin Green people hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing comes out when you top up — the tank just holds more of the same mixture. Percentage is not how a diesel fuel system copes with petrol, however much that advice supposes.
"Modern diesels can handle a little petrol" — a myth, and nearer the opposite. At higher pressure, through smaller components: that is how a modern diesel handles its fuel, so the protection counts more, not less.
This is the one that catches people. Myth: "If it starts and drives, there's no harm done." The motorist of a petrol motor fed diesel usually stops, because it will not run, and the harm stops there. A diesel fed petrol generally starts, idles and drives away as if nothing has happened, whilst the pump grinds. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive it home." It is an old workaround for a separate problem. None of what petrol thinned gets put back by it — and later, the tank still contains that petrol.
The next start sends petrol back round the pump from the lines and your filter, where some of it ends up once your engine has run. That is why a DIY tank drain doesn't sort it — a myth. It's also really dangerous to drain petrol into a can by the roadside.
Why petrol in a diesel takes place so easily
On purpose? Never. Through carelessness? Seldom, if ever. A diesel nozzle mostly won't fit a petrol car, but the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error straightforward, and just in one direction.
The moment routine stops matching the vehicle is the moment it happens. Courtesy car, hire car, or a vehicle that's brand new. Two vehicles on one drive, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A train to catch, and a hurried fill on the way to Leyland. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver used to petrol: exactly when it happens. Throw in a back seat full of children, a phone call or rain, and the hand takes over.
Turpin Green drivers: how to avoid petrol in a diesel next time
- Read the petrol pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on each forecourt. The label is what counts.
- The first fill in an unfamiliar car is the time to check the filler flap — on it, or on the cap, many cars state which fuel to use.
- Label your 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.
- It seems silly and it works: on the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump.
- Tuck your phone away. This is an easy mistake to make whilst you are thinking about something else.
- Some diesels have a filler designed to block a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the petrol pump.
- Less petrol makes a thinner mixture, so stop the moment you realise — while remembering that the next stage is unchanged. It is still not to fire it up.
Already put petrol in a diesel around Turpin Green?
The order of things is brief, then. Do not fire it up, and don't turn the ignition on. The staff at the forecourt — whether at Morrisons itself or wherever you filled up — will usually help roll it clear of the pump if you ask. Next, 0333 366 0103. We will ask what went in, about how much, and if it's been run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a separate issue — Turpin Green has a page just for it.
One petrol in a diesel task in Turpin Green costs more than another. Why?
There's no fair single price for this, since the four situations above are four different jobs. Which of them you are in is mostly what moves your cost. After that it is the proportion — how much petrol got in against how much the tank holds — and then where the vehicle is and whether a technician can get to it safely.
That's why our engineers ask three queries before costing rather than after: what got in, how much, and if it has run. Given the answers, you get a straight figure instead of a range.
About Turpin Green and where it is
Turpin Green is a suburban area in Lancashire, situated on the riverside at an elevation of 43 metres, with semi-detached housing being the predominant type of accommodation. Turpin Green lies close to the city of Preston, approximately 4.6 miles away, and is near other places such as Golden Hill, Leyland, and Clayton-le-Woods. Turpin Green has a population of around 6957 people and is located in the North West region of England, about 185.4 miles from London.
Turpin Green and Lancashire: where our fuel drain cover runs
Golden Hill, Leyland and Clayton-le-Woods are among the locations near Turpin Green that the same vans work, answering petrol in diesel calls across Turpin Green's PR postcode area. The car does not need to move to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the petrol pump around Turpin Green?
The best spot there is, then — that's where you are. Call, and leave it switched off.