Petrol in a Diesel Car in Redburn: How Worried Should You Be?
Far less than you probably are, if it hasn't been started. Everyone in Redburn begins with "have I ruined it?", and the fair answer is usually no: petrol resting inside that tank of a diesel remains harmless till priming, cranking or driving draws it into the fuel system. Keep it that way: leave your motor off then phone Petrol in Diesel. The remainder of this page sets out 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 a second time.
Your engine and petrol in a diesel: what happens
Passing through a motor, diesel does two jobs at once. It protects to begin with, and only then does it burn. Built to very fine tolerances, the injectors and the pump rely on the diesel flowing through them to stop their surfaces wearing against one another.
Of these two tasks, petrol handles the first poorly and the second never. It is runnier than diesel and removes the lubrication your fuel system rests on, so a pump running on a petrol mixture is a pump wearing itself. And petrol is made to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That is where the rattling comes from.
Together, those make the shape of the issue clear. It is circulation that causes the harm, not contact. Any tank with petrol in it is a fuel fault. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with your fuel to the fuel injectors further on.
Four situations our technicians see around Redburn: how bad is petrol in a diesel?
Fuelled up, never started. The best case there is. On a forecourt, and truly only there, the petrol is still limited to your tank — since anywhere else the car was driven to reach it. The task is draining and rinsing on the spot.
Ignition on, or started for a moment. Petrol has come out of your tank and got to the filter and the lines, since your system has been primed. That is normally still an easy job — a drain, a flush, and the fuel filter seen to.
The pump now worked a couple of miles on thinned fuel — that is what driving the vehicle meant. The work is that tank, the lines, your filter and clean fuel through the whole circuit, and how hard your car was driven counts as much as how far. On the school run to the local primary school, the mileage is short. Very different a second time: a run to Glasgow, under 15 miles away, or some distance on the M8, under 5 miles from Redburn, where the motor kept working hard.
Driven on till it complained — clattering, smoke, a lumpy idle, a dead throttle. The motor is telling you the fuel is no longer behaving like diesel. Pull up where you are — on the verge on Redburn, at the kerb, down a side road — and don't move it again. Lasting damage is very rare when a vehicle is stopped quickly, and the drain and flush that still go first sort it out.
What Redburn drivers get told about petrol in a diesel — and the stories in it
"Top it up the rest of the way with diesel and it will be fine" — a myth. It will not. Nothing comes out when you top up — that tank just holds more of the same blend. That advice assumes a diesel fuel system tolerates petrol by percentage. It does not.
"Newer diesels can handle a little petrol" — a myth, and closer to the opposite. At higher pressure, through finer parts: that's how a newer diesel moves its fuel, so the protection matters for more, not less.
"It starts, it drives, so there is no harm" — the myth that trips up more people than any other. The motorist of a petrol engine fed diesel usually stops, since it will not run, and the harm stops with them. A diesel fed petrol normally starts, idles and drives away as if nothing has happened, whilst your pump grinds. Running doesn't mean fine.
Myth: "Add some two-stroke oil and drive it home." It is an old workaround for a separate problem. What petrol has thinned remains thinned, and that petrol stays in the tank anyway.
Myth: "Drain the tank yourself and you're sorted." Once the motor has run, some of that petrol is no longer in your tank: it is in the filter and the fuel lines, and it goes right back through the pump at your next start. Clearing petrol into a can by the roadside is also really dangerous.
How it happens: petrol in a diesel
No one does it on purpose, and it is seldom carelessness. A diesel nozzle generally will not go into a petrol motor, but the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error simple, and only in that direction.
When routine and your car stop matching, it happens. Courtesy car, hire car, or a motor that's brand new. Households running one of each, petrol and diesel. A familiar forecourt with the pumps in a different order. A rushed fill en route to Alexandria with a train to catch. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is exactly the moment it happens. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of kids.
How to avoid petrol in a diesel at your next fill-up in Redburn
- A green handle for unleaded and black for diesel is normal in the UK — but not on every forecourt. Go by the label on the pump, not the colour.
- In a motor you do not know, look inside the flap over the filler or at the cap before your first fill: many cars state the fuel there.
- One of each in the home? Mark the key to the diesel — a coloured fob, a sticker — because intending to remember isn't enough.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump. It seems silly and it does the trick.
- Mistakes like this are simple to make whilst your mind is on something else, so the phone goes away.
- 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 vehicles without one. They are a safety net, not a reason to stop reading the petrol pump.
- Noticing it mid-fill? Stop at once. A weaker blend results from less petrol in that tank, yet the next stage remains the same: don't crank it.
Petrol already in a diesel around Redburn? Begin here
The order of things is brief, then. Don't start the car, and do not turn the ignition on. Yet at the forecourt, at John H Glen & Son or anywhere else? Ask the attendants to help you roll it clear of the pump. Then phone 0333 366 0103 and tell us what went in, roughly how much, and if it's run.
If it was AdBlue instead of petrol, say so. That's a separate fault — corrosion and deposits rather than lost protection — and it has its own page for Redburn.
Redburn petrol in a diesel tasks: why one costs more than another
An honest single quote doesn't exist here: four scenarios, four separate tasks. Which of them you are in is chiefly what moves your cost. Where the vehicle is counts too, and whether a van can safely get to it, after the ratio of petrol to what the tank holds.
Three questions come first, before any quote, rather than after — what got in, how much, has it run — and that is the reason. Given those answers, there is a straight figure instead of a range.
About Redburn and its setting
Redburn is a coastal suburban area in West Dunbartonshire, situated near the towns of Bonhill and Braehead, with Ohare nearby. Redburn sits at an elevation of 58 metres, overlooking the surrounding landscape, and is located approximately 14.8 miles from Glasgow. Redburn has a mix of housing types, but is predominantly characterised by terraced homes. Redburn is part of the wider Glasgow urban area, but retains its own distinct community,
Fuel drain cover around Redburn and across West Dunbartonshire
The vans answering petrol in diesel jobs in Redburn, in the G postcode area, also work the locations around it, Bonhill, Ohare and Braehead included. 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 come to us.
Redburn: still at the petrol pump?
Then you're in the best spot there can be. Keep the vehicle turned off, then ring.