Petrol in a Diesel Car in Birchgrove: How Worried Should You Be?
Unstarted? Then less worried than you probably are. Petrol resting in a diesel tank does nothing to your motor until something pulls it through the fuel system — the ignition priming the pump, your starter, or the drive itself. So the truthful answer to the first question everyone around Birchgrove asks, "have I ruined it?", is usually no. To keep it like that, phone Petrol in Diesel then leave your engine switched off. The rest of this page covers 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.
Inside the engine: what petrol in a diesel does
Two tasks fall to diesel on its journey round a motor. Oiling comes before burning; it does both. Your high-pressure pump and the injectors are made to extremely fine clearances, and the diesel passing through them is what keeps those surfaces from grinding against one another.
Petrol handles the first job badly and the second not at all. A pump running on a petrol blend is wearing itself out, since petrol is runnier than diesel and takes away the lubrication the fuel system relies on. Petrol is also made to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that's where the rattling comes.
Taken together, they make clear the shape the problem takes. Contact doesn't do the harm — movement does. Where the petrol is only inside that tank, it's a fault of fuel, nothing more. The beginning of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds moves on with the fuel to your injectors beyond it.
Four scenarios our engineers see in Birchgrove: how serious is petrol in a diesel?
Fuelled, and not started: nothing beats it. Only the tank has petrol in it, and so the task is draining your tank and rinsing your system where the car stands. This scenario can only really happen on a forecourt: anywhere else, the vehicle got there by being driven.
Ignition on, or started for a moment. Once primed, the fuel system has drawn petrol out of your tank up to your filter and the fuel lines. That is usually still a straightforward task — a drain, a flush, and your filter dealt with.
The pump now worked a couple of miles on weakened fuel — that is what driving the car meant. The work is that tank, the fuel lines, the fuel filter and clean fuel through the entire system, and how hard the vehicle was driven counts as much as how far. A school run to the local primary school is one thing. Getting as far as Cardiff, under 15 miles away, makes a very different task — as does any distance on the M4, under 10 miles from Birchgrove, with the engine working hard all the way.
Driven on till it protested — knocking, smoke, a ragged idle, a dead throttle. That is your engine telling you its fuel no longer is behaving like diesel. Stop wherever you are — the verge on North Road, a lay-by, a side street — and leave it there. A vehicle pulled over soon very rarely has long-term damage, as the drain and the flush-through, which still come first, sort it out.
What Birchgrove motorists 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 by topping up — you're left with a bigger tank, still the same mixture. The assumption behind the guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
"Newer diesels can handle a little petrol" — a myth, and nearer the opposite. At higher pressure, through more precise parts: that is how a newer diesel moves its fuel, and so the lubrication counts more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that catches people. Any petrol motor fed diesel normally won't run, so the motorist stops and the harm stops with them. Whilst the pump grinds, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Running is not the same as fine.
Not so: a two-stroke additive makes it safe to drive home. It is an old fix, supposed for another issue. The petrol is still in that tank after that, and what it has diluted is not put back.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol lies in the fuel filter and lines, waiting to go straight back through your pump on your next start. It is also truly risky to drain petrol into a can by the roadside.
How does petrol in a diesel take place?
No one does it on purpose, and it's rarely carelessness. One way only, because of the nozzles: the narrower 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 simple.
It happens when habit and the vehicle stop matching. Courtesy car, hire car, or a motor that is brand new. A household with one petrol and one diesel on the driveway. A forecourt you know, but with its pumps laid out differently. A rushed fill en route to Porth with a train to catch. A new-to-you diesel Renault Megane, its first fuelling, and a motorist used to petrol: exactly when it happens. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
Birchgrove people: how to avoid petrol in a diesel next time
- Green for unleaded and black for diesel is normal in the UK — yet not on every forecourt. Go by the label on the pump, not the colour.
- Many motors state the fuel type inside the filler flap or on the cap, so check there on the first fill in a car you don't know.
- Label the 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 sounds silly and it works: on the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump.
- While you are thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Some diesels come with a filler designed to refuse a petrol nozzle, and devices you can add exist for motors without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the petrol pump.
- Noticing it mid-fill? Stop there and then. A thinner mix follows from less petrol in that tank, yet your next step stays the same: don't fire it up.
Petrol already in a diesel in Birchgrove? Start here
Short and simple, then, is the order of things. Don't start the car, and do not switch the ignition on. If you're still on the forecourt — Texaco or anywhere else — ask the staff to help you push it away from the pump. Then phone 0333 366 0103 and tell us what went in, about how much, and if it's run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a separate fault — Birchgrove has a page all for it.
Why one petrol in a diesel job in Birchgrove costs more than another
Four different tasks lie behind the four scenarios above — which is why there's no fair single price. The scenario itself does most of the work of moving the cost. Where your car is matters too, and whether a van can safely get to it, after the proportion of petrol to what your tank takes.
Before any quote, not after, come three queries: the fuel that went in, its volume, and whether it's run. That is why. Those answers are what change a range into one firm number.
About Birchgrove, briefly
Birchgrove is a suburban area in Rhondda Cynon Taf, situated near the riverside at an elevation of 101 metres. Birchgrove lies close to the communities of Glynfach, Porth, and Mount Pleasant, and is approximately 13.6 miles from Cardiff. Birchgrove has a population of around 4630 people, predominantly living in terraced housing. Birchgrove is also within commuting distance of major cities, being 141.1 miles from London.
Fuel drain cover across Rhondda Cynon Taf, Birchgrove included
Birchgrove waits in the CF postcode area, and the teams that answer petrol in diesel call-outs there work the locations around it as well — Glynfach, Porth and Mount Pleasant among them. Our engineers drain where the vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Birchgrove: still at the pump?
Then you're in the best spot there is. Leave the car switched off, and ring.