Petrol in a Diesel Car in Braidfauld: How Worried Should You Be?
Not started? Then less anxious than you probably feel. Petrol sitting in a diesel tank does nothing to your engine until something draws it through the system — the ignition priming the pump, the starter, or the drive itself. So the fair answer to the first question anyone in Braidfauld asks, "have I wrecked it?", is normally no. Leave your engine off and ring Petrol in Diesel — that is how you keep it that way. The remainder of this page explains what petrol really does to a diesel, how to tell how far it has got, and how to make sure it doesn't happen to you again.
What petrol in a diesel does to your engine
Two jobs fall to diesel on its journey through a motor. It lubricates first, and after that does it burn. Extremely fine gaps are built into the injectors and the high-pressure pump, and only your diesel flowing through stops their surfaces grinding together.
Of these two jobs, petrol manages the first poorly and the second never. A pump running on a petrol blend is wearing itself out, since petrol is runnier than diesel and strips out the protection your fuel system depends on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that's where any knocking comes.
Put these together and the shape of the trouble is clear. Contact does not do the damage — movement does. A tank with petrol in it is a fuel problem. Whatever a worn pump sheds travels on, carried by your fuel, into your injectors downstream, which is why a pump that has been working on that petrol is where a mechanical problem begins.
Four scenarios we see in Braidfauld: how serious is petrol in a diesel?
Filled up, not once started. The best case there is. Only your tank has petrol in it, so the job is draining your tank and flushing the system where your car sits. This situation can only truly take place on a forecourt: anywhere else, your car got there by being driven.
The ignition switched on, or a short start. The fuel system has been bled, and so petrol has left the tank and reached your filter and your lines. Normally nothing more than clearing, cleaning and sorting your filter, so still simple.
Driven a few miles. Now your pump has spent those miles running on weakened fuel. Tank, lines, filter, then fresh fuel run through the whole circuit: that is the work, and the way the vehicle was driven counts as much as the miles. Driving the children to the local primary school is one kind of trip. Driving as far as Glasgow, under 3 miles away, makes a very different job — as does any miles on the M74, under a mile from Braidfauld, with your engine working hard all the way.
Driven until it protested. Clattering, an uneven idle, smoke, a throttle that has gone soft. The motor is telling you the fuel is no longer behaving like diesel. Leave it where it has stopped: a lay-by, a side street, the verge on Tollcross Park Gardens. Long-term damage is very uncommon if a vehicle is stopped early, and the fuel drain and flush that still go first take care of it.
Braidfauld people and the petrol in a diesel stories they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." A fuller tank of the same mixture is all it gives, since topping up takes out nothing. Percentage is not how a diesel fuel system copes with petrol, however much that guidance assumes.
If anything, the reverse is true. Myth: "A newer diesel can cope with a bit of petrol." At higher pressure, through finer components: that's how a current diesel moves its fuel, so the lubrication matters for more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there is no damage done." Feed diesel to a petrol engine and it normally will not run, and so the motorist stops — and the harm stops with them. A diesel fed petrol generally starts, ticks over and drives away as if nothing has happened, whilst your pump grinds. Fine and running aren't the same thing.
An outdated fix for a different issue is behind this one. Myth: "Add some two-stroke oil and drive the car home." None of what petrol diluted gets put back by it — and later, the tank still holds the petrol.
The next start sends petrol back round your pump out of the lines and the filter, where some of it sits after the engine has run. That is why draining your tank yourself doesn't leave you sorted — a myth. And, a can of petrol drained at the roadside is genuinely hazardous.
How it happens: petrol in a diesel
A careless moment is rarely the cause, and no one means to do it. One way only, since of the nozzles: the slimmer petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one mostly won't fit a petrol vehicle. That is how the forecourt makes it straightforward.
Routine and your car getting out of step is when it takes place. A new vehicle, a hire car or a courtesy car. Two cars on one driveway, one petrol, one diesel. The pumps in a different order on a familiar forecourt. A rushed fill en route to Carntyne with a train to catch. A new-to-you diesel Renault Clio, its first fuelling, and a motorist accustomed to petrol: precisely when it happens. Throw in rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
Braidfauld motorists: how to prevent petrol in a diesel next time
- A green handle for unleaded and black for diesel is normal in the UK — but not on each forecourt. Go by the label on the pump, not the colour.
- In a car you don't know, look inside the flap over your filler or at the cap before your first fill: many motors print the fuel type there.
- One of each in the home? Label your key to the diesel — a coloured fob, a sticker — because meaning to remember is not enough.
- It seems silly and it does the trick: on your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump.
- Tuck the phone away. This is an easy mistake to make whilst you are thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to block a petrol nozzle, and add-on devices are available for cars without one. They are a backstop, not a reason to stop checking the petrol pump.
- Stop the moment you realise. Less petrol in the tank means a thinner mixture. It does not change what to do next, which is still not to fire it up.
Braidfauld: already put petrol in a diesel?
Then, there is only a short order of things. Leave it unstarted, with the ignition off too. If you are still at the forecourt — Shell or anywhere else — ask the staff to help you push it away from the petrol pump. What was put in, about how much, and whether it's run: tell us that when you call 0333 366 0103.
Corrosion and deposits are the trouble with AdBlue, where petrol means lost protection. So if it was AdBlue, say so — and read its own Braidfauld page.
Why one petrol in a diesel job around Braidfauld costs more than another
There is no honest single quote for this, because the four scenarios above are four separate tasks. Which of them you're in is chiefly what shifts your cost. Where the vehicle is matters too, and whether a technician can safely get to it, after the share of petrol to what that tank holds.
Three questions come first, before quoting, instead of after — what was put in, how much, has it run — and this is the reason. A range becomes a straight figure once the answers are in.
About Braidfauld and where it is
Braidfauld is a suburban area situated on the riverside in Glasgow City, with a relatively low elevation of 21 metres. Braidfauld lies approximately 2.5 miles east of Glasgow city centre, near neighbouring areas such as Tollcross and Parkhead. Braidfauld is characterized by its predominantly flat-type housing, which accommodates a population of around 7063 residents.
Across Glasgow City and in Braidfauld: fuel drain cover
Our teams answering petrol in diesel jobs around Braidfauld, in the G postcode area, also work the places around it, Tollcross, Dalbeth and Parkhead included. No need to move your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots we drain.
Still at the petrol pump in Braidfauld?
In that case, you couldn't be in a better place. Call, and keep it switched off.