Petrol in a Diesel Car in Illogan: How Worried Should You Be?
Far less than you probably are, if it hasn't been started. Petrol sitting in a diesel tank does nothing to your motor until something draws it through the system — your ignition priming your pump, the starter, or driving itself. So the honest answer to the first question anyone around Illogan asks, "have I wrecked it?", is usually no. Leave your engine off and call Petrol in Diesel — that is how you keep it that way. What petrol actually does to a diesel, how to gauge how far it's gone, and how to keep it from happening again: that is the remainder of this page.
What petrol in a diesel does to the engine
Two jobs fall to diesel on its route through a motor. Before it combusts, it lubricates — then it burns. Built to extremely fine clearances, the injectors and your pump rely on the diesel moving through them to stop their surfaces wearing against one another.
Petrol handles the first job poorly and the second not at all. Being less viscous than diesel, petrol strips out the protection a fuel system needs, so a pump running on that mixture to wear itself. It is also made to resist igniting under compression — the opposite of what a diesel needs — which is where you get the knocking.
The shape of the trouble is plain once you put those together. The harm is done by movement, not by contact. Petrol in a tank is a fuel fault. Whatever a worn pump sheds travels on, carried by the fuel, into the injectors downstream, which is why a pump that has been working on that petrol is where a mechanical fault begins.
Four situations we see in Illogan: how bad is petrol in a diesel?
Fuelled, and never started: no case is better. Just the tank has petrol in it, so the job is draining your tank and rinsing the system where your car stands. This scenario can only truly take place at a forecourt: anywhere else, the car got there by being driven.
A brief spell of running, or just the ignition on. Once primed, your system has pulled petrol from your tank up to your filter and the fuel lines. That is normally still a simple task — a drain, a flush, and the fuel filter seen to.
A couple of miles driven, and your pump has spent every one of them running on thinned fuel. How hard your car was driven counts as much as how far, and the work covers that tank, the fuel lines, the filter and fresh fuel through the entire circuit. Driving the kids to Treloweth Community Primary School is one kind of trip. A run as far as Truro, under 10 miles away, is a very different job. So is any distance on the M5, over 50 miles from Illogan, where the motor has been labouring hard the whole time.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone lumpy. The motor is telling you your fuel is no longer acting like diesel. Whether it's the verge on Richards Lane, a lay-by or a side street, stop where you are and leave it. Long-term damage is very rare when a vehicle is stopped quickly, and the drain and flush-through that still go first deal with it.
Petrol in a diesel stories Illogan people hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing comes out when you top up — that tank just carries more of the same blend. A diesel fuel system does not tolerate petrol by percentage in the way that advice assumes.
"Current diesels can handle a little petrol" — a myth, and closer to the opposite. A newer diesel sends its fuel through smaller components at higher pressure, which makes the protection matter more, not less.
"It starts, it drives, and so no harm done" — the myth that catches more motorists than any other. Diesel in a petrol motor usually means a motor that will not run: the driver stops, and so does the harm. Whilst your pump wears, a diesel fed petrol usually starts, idles and drives away as though nothing has happened. Running is not the same as fine.
An outdated fix for a distinct issue is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." None of what petrol thinned is put back by it — and later, the tank still holds the petrol.
"Drain it yourself and you are sorted" — a myth, because after it has been running some petrol lies in the filter and lines, waiting to go right back through the pump on your next start. On top of that, petrol emptied into a can by the road is truly hazardous.
How does petrol in a diesel occur?
Nobody does it on purpose, and it is seldom carelessness. The petrol nozzle is the smaller of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol motor at all. The forecourt makes it simple, and the error runs one way.
The moment habit stops matching your car is the moment it occurs. Courtesy car, hire car, or a motor that's new. One petrol and one diesel on the drive of the same household. A forecourt you know, but with its pumps arranged differently. Filling up in a hurry on the way to Redruth, with a train to catch. Exactly the moment it occurs: after years of driving petrol, a driver fills a diesel Renault Megane for the first time. Throw in rain, a phone call or a back seat full of children, and the hand does what it has always done.
Next time you fill up in Illogan: avoiding petrol in a diesel
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Read the petrol pump's label; the colour is just a hint.
- The first fill in an unfamiliar motor is the time to check the filler flap — on it, or on the cap, many vehicles state which fuel to use.
- One of each in the home? Mark your key to your diesel — a coloured fob, a sticker — since meaning to remember isn't enough.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump. It seems daft and it works.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck your phone away then keep your mind on the pump.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to refuse a petrol nozzle, and add-on devices exist for motors without one. They are a backstop, not a reason to stop checking the petrol pump.
- The moment you realise, stop: less petrol inside that tank makes a thinner blend. What to do next does not change, though — still do not crank it.
Already put petrol in a diesel in Illogan?
Then the order of things is short. Starting it is out, and so is turning on your ignition. The attendants on the forecourt — whether at Morrisons itself or wherever you filled up — will normally help push it clear of the pump if you ask. What got in, roughly how much, and whether it's run: tell us those when you call 0333 366 0103.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate fault — Illogan has a page all for it.
Illogan petrol in a diesel tasks: why one costs more than another
There is no fair single price for this, because the four scenarios above are four different jobs. The situation itself does most of the work of moving the cost. The ratio counts next, meaning how much of the tank is petrol, followed by the location of the car and whether getting to it is safe for a van.
Three questions come first, before quoting, instead of after — what was put in, how much, has it run — and that is the reason. With those answers, there is a straight figure instead of a range.
About Illogan, for a moment
Illogan is a coastal village in Cornwall, situated approximately 94 metres above sea level, with views out to the surrounding coastline. Illogan is located near several smaller settlements, including Paynters Lane End, West Tolgus, and Tolgus Mount, and is around 9.5 miles from the city of Truro. Illogan has a population of around 2080 people, predominantly living in detached housing. Illogan is also some distance from major urban centres, being around 240 miles from London.
Across Cornwall and around Illogan: fuel drain cover
Paynters Lane End, West Tolgus and Tolgus Mount are among the locations near Illogan that the same teams work, answering petrol in diesel jobs across Illogan's TR postcode area. A forecourt, a supermarket car park, a lay-by or your own driveway are all places we drain, and the vehicle doesn't need to move to us.
In Illogan and still at the pump?
The best position there is, then — that is where you are. Keep it off. Phone.