How Worried Should You Be? Petrol in a Diesel Car in Old Monkland
Far less than you probably are, provided it hasn't been started. Petrol resting in a diesel tank does nothing to your motor till something draws it through the fuel system — the ignition priming the pump, the starter, or the drive itself. So the truthful answer to the first query everyone in Old Monkland asks, "have I wrecked it?", is generally no. Keep it that way: leave your engine off then ring Petrol in Diesel. The remainder of this page covers what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you again.
Inside the engine: what petrol in a diesel does
Passing through an engine, diesel is doing two things at once. It lubricates to begin with, and only then does it burn. The high-pressure pump and the fuel injectors are built to extremely fine gaps, and your diesel passing through them is what keeps those surfaces from grinding against each other.
Of those two jobs, petrol manages the first badly and the second never. The clattering 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 runnier than diesel, it strips away the lubrication your system hinges on, and any pump running on such a blend is wearing itself.
Put those together and the shape of the issue is plain. Not contact but movement is what does the damage. All a tank with petrol in it amounts to is a fuel problem. Whatever a worn pump sheds goes on, borne by your fuel, into your injectors downstream, which is why a pump that has worked on the petrol is where a mechanical fault starts.
Old Monkland, petrol in a diesel: four cases, from mild to significant
Fuelled up, never started. The best case there is. Being at a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With the petrol kept inside the tank alone, it's drained and rinsed right where it stands, and nothing more is needed.
Started for a moment, or just your ignition on. Petrol has come out of that tank and reached the filter and the lines, since the system has been bled. Drain, flush, see to the fuel filter: still normally simple.
Those few miles driven were the pump working on fuel diluted by petrol the whole way. How hard the vehicle was driven counts as much as how far, and this work covers your tank, your lines, the filter and fresh fuel through the entire circuit. On the school run to the local primary school, the distance is small. A run as far as Glasgow, under 10 miles away, is a very different job. So is any mileage on the M8, under a mile from Old Monkland, where your engine has been running hard throughout.
Driven till it complained. Clattering, an uneven idle, smoke, a throttle that has gone soft. That's the motor telling you its fuel no longer is acting like diesel. Pull up wherever you are — the verge on Rowan Place, a lay-by, a side street — then leave the vehicle where it is. Lasting damage is very rare when a car is pulled over soon, and the fuel drain and flush that still go first deal with it.
What Old Monkland people get told about petrol in a diesel — and the myths in it
False: topping up to full with diesel makes it fine. It does not. Nothing is removed when you top up — the tank simply holds more of the same mixture. That advice assumes a diesel fuel system handles petrol by percentage. It doesn't.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." Finer parts and higher pressure are how a current diesel runs its fuel, and that makes the lubrication matter more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that catches drivers. Feed diesel to a petrol engine and it usually won't run, so the motorist stops — and the harm stops with them. Feed petrol to a diesel and it normally starts, idles and pulls away like nothing has happened — all the while its pump is wearing. Running does not mean fine.
An outdated fix for a distinct fault is behind this one. Myth: "Add some two-stroke oil and drive the car home." It does not put back what petrol has weakened, and the petrol is still inside the tank later.
"Drain it yourself and you're sorted" — a myth, since after it's been running some petrol lies in the filter and lines, waiting to go right back through the pump on your next start. It's also really dangerous to drain petrol into a can by the roadside.
How petrol ends up: petrol in a diesel
A careless moment is seldom the cause, and no one means to do it. The forecourt makes it simple: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle generally will not go into a petrol motor at all. So the mistake runs one way.
Habit and your car falling out of step is when it happens. Hire cars, courtesy cars, and motors that are new to you. Households running one of each, petrol and diesel. The pumps in a different order on a well-known forecourt. A hurried fill en route to Kirkwood with a train to catch. Years of petrol motors behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that's when. Throw in a back seat full of children, a phone call or rain, and habit takes over.
How to prevent petrol in a diesel on your next fill-up in Old Monkland
- Green for unleaded and black for diesel is normal in the UK — but not on each forecourt. Go by the label on the petrol pump, not the colour.
- Many vehicles state the fuel inside your filler flap or on the cap, and so check it on your first fill in a vehicle you do not know.
- One of each in the household? Mark the key to the diesel — a bright fob, a sticker — since meaning to remember isn't enough.
- "Diesel", out loud, before you lift the nozzle — each time a new or hired car needs its first tank. It sounds daft. It works.
- Mistakes like this are easy to make while your mind is on something else, and so your phone goes away.
- Some diesels have a filler built to block a petrol nozzle, and devices you can add are available for vehicles without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the pump.
- Less petrol means a thinner mix, so stop as soon as you notice — while remembering that the next stage is unchanged. It's still not to start the vehicle.
Petrol already in a diesel in Old Monkland? Start here
Short and simple, then, is the order of things. Leave it unstarted, with the ignition off as well. Still at the forecourt, at Gulf or anywhere else? Ask the staff to help you roll the car away from the pump. Then phone 0333 366 0103 and tell us what went in, about how much, and whether it has run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a different problem — Old Monkland has a page all for it.
What makes one Old Monkland petrol in a diesel job cost more than the next
There is no fair single price for this, because the four situations above are four separate tasks. Which of them you are in is chiefly what shifts your cost. After that it is the ratio — how much petrol got in against how much the tank holds — and then where the vehicle is and whether our van can reach it safely.
That is why our technicians ask three queries before quoting rather than after: what was put in, how much, and whether it has run. A range becomes a straight figure when the replies are in.
About Old Monkland itself
Old Monkland is a suburban area in North Lanarkshire, situated on the riverside at an elevation of 87 metres, with terraced housing being the predominant type of accommodation. Old Monkland lies close to the nearby places of Kirkshaw, Kirkshaws, and Shawhead, and is approximately 7.7 miles from Glasgow. Old Monkland has a population of around 8501 residents, and its location near the river has influenced its development over time. Old Monkland is also relatively distant from London, at a distance of 339.9 miles.
Fuel drain cover in Old Monkland and across North Lanarkshire
Old Monkland waits in the ML postcode area, and the vans that answer petrol in diesel calls there work the spots near it as well — Kirkshaw, Kirkshaws and Shawhead among them. No need to move your car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all locations where we work.
Still at the petrol pump around Old Monkland?
The best spot there is, then — that is where you are. Leave it turned off, and ring.