Bideford: Petrol in a Diesel Car? How Worried to Be
Far less than you likely are, provided it has not been started. Petrol resting in a diesel tank does nothing to the motor till something pulls it through the system — the ignition priming your pump, your starter, or driving itself. So the truthful answer to the first question everyone around Bideford asks, "have I ruined it?", is generally no. Keep it like that: leave your motor off then ring Petrol in Diesel. What petrol really does to a diesel, how to gauge how far it's travelled, and how to stop it from happening a second time: that's the rest of this page.
Inside your engine: what petrol in a diesel does
Diesel has two tasks on its way through a motor. Before it burns, it lubricates — then it combusts. Built to extremely fine gaps, the fuel injectors and your pump rely on your diesel moving through them to stop their surfaces wearing against one another.
Badly at the first, not at all at the second: that is petrol. It's thinner than diesel and removes the protection your fuel system depends on, and so a pump running on a petrol blend is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That's where the clattering comes from.
Seen together, they make clear the shape the issue has. Contact doesn't do the damage — circulation does. All a tank with petrol in it amounts to is a fuel issue. After your pump has been labouring on that petrol, a mechanical fault has begun: anything shed by a pump that's wearing is carried onward to the fuel injectors with your fuel.
Four situations we see in Bideford: how serious is petrol in a diesel?
The best case there can be: filled up, not once started. On a forecourt, and truly only there, the petrol is still confined to that tank — because anywhere else the vehicle was driven to reach it. The job is draining and rinsing on the spot.
Ignition on, or started for a moment. With the system primed, the fuel lines and filter now hold petrol that has come from that tank. That is normally still a simple task — a drain, a flush, and the fuel filter dealt with.
Those few miles on the road were your pump working on fuel thinned by petrol throughout. How hard the vehicle was driven matters as much as how far, and the work takes in that tank, your lines, the fuel filter and fresh fuel through the whole circuit. A school run to West Croft School is one thing. Any mileage on the M5, under 50 miles from Bideford, means your engine has worked hard throughout, and a run to Exeter, under 50 miles away, is a very different task too.
Driven on until it complained — rattling, smoke, a ragged idle, a soft throttle. What you are hearing is your engine reporting fuel that no longer runs like diesel. Pull up wherever you are — the verge on B3233, a lay-by, a side street — and leave it where it is. A vehicle pulled over early very seldom has permanent damage, as the fuel drain and the flush-through, which still come first, sort it out.
Myths Bideford people hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing is removed when you top up — that tank just carries more of the same mixture. That guidance assumes a diesel fuel system tolerates petrol by percentage. It doesn't.
"Current diesels can handle a little petrol" — a myth, and closer to the opposite. At higher pressure, through finer parts: that's how a current diesel moves its fuel, so the protection counts for more, not less.
"It starts, it drives, so there is no harm" — the myth that trips up more drivers than any other. The motorist of a petrol engine fed diesel normally has no choice but to stop, because it will not run, and the harm stops there. Feed petrol to a diesel and it generally starts, ticks over and pulls away as if nothing happened — all while its pump is wearing. A running engine does not mean fine.
Not so: a two-stroke additive lets you to drive home. It is an old workaround, meant for another issue. None of what petrol weakened is put back by it — and afterwards, that tank still contains that petrol.
Myth: "Drain your tank yourself and you are sorted." Once the engine has run, some of that petrol is no longer in that tank: it's in your filter and the fuel lines, and it goes right back through your pump on your next start. It's also genuinely dangerous to drain petrol into a can at the roadside.
Why petrol in a diesel takes place at all
It is seldom carelessness, and nobody does it on purpose. One way only, since of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol motor. That is how the forecourt makes it straightforward.
The moment routine stops matching the car is the moment it takes place. A motor that is new to you — a hire car, on loan as a courtesy car, or brand new. A household with one petrol and one diesel on the driveway. The pumps in a different order on a familiar forecourt. Fuelling up in a hurry en route to Barnstaple, with a train to catch. Precisely the moment it happens: after years of driving petrol, a driver fills a diesel Renault Megane for the first time. The hand does what it has always done once you add rain, a phone call or a back seat full of children.
Preventing petrol in a diesel next time you fill up in Bideford
- Green for unleaded and black for diesel is usual in the UK — but not on each forecourt. Go by the label on the petrol pump, not the colour.
- Inspect your filler flap. Many cars state the fuel type inside the flap or on the cap. Look at it on your first fill in a motor you don't know.
- One of each in the household? Label the key to your diesel — a coloured fob, a sticker — since intending to remember isn't enough.
- It seems daft and it does the trick: on your first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, so put the phone away then keep your mind on the petrol pump.
- Some diesels come with a filler built to block a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the petrol pump.
- Noticing it mid-fill? Stop at once. A weaker mix results from less petrol inside your tank, but the next stage remains the same: do not start the vehicle.
Already put petrol in a diesel in Bideford?
The order of things is short, then. Don't fire it up, and do not turn the ignition on. Ask the attendants to help you roll it away from the pump if you are still on the forecourt, whether that is Texaco or somewhere else. Call 0333 366 0103 next, with three facts — your fuel, the approximate amount, and if it has run.
Corrosion and deposits form the trouble with AdBlue, where petrol brings lost protection. So if it was AdBlue, say so — and read its own Bideford page.
Bideford petrol in a diesel jobs: why one costs more than another
Four different tasks sit behind the four scenarios above — which is why there is no fair single quote. Mostly, the cost shifts with which situation you are in. Two things come after that: the petrol that went in as a share of what your tank takes, then the place the car is in and whether our van can get to it safely.
Three queries come first, before any quote, instead of after — what went in, how much, has it run — and this is the reason. A range becomes a straight figure when the answers are in.
About Bideford
Bideford is a coastal town in north Devon, situated on the estuary of the River Torridge where it flows into the Atlantic Ocean. Bideford has a long history of maritime trade and remains a significant urban centre in the region, with nearby neighbourhoods including East-the-Water and Orchard Hill. Bideford is characterized by its predominantly terraced housing stock and a population of around 16671 people. Bideford sits at a low elevation of around 7 metres above sea level, close to the south-western coast of England.
Fuel drain cover across Devon, Bideford included
Bideford waits in the EX postcode area, and the vans that answer petrol in diesel call-outs there work the spots near it as well — East-the-Water, Orchard Hill and Raleigh Estate among them. Our technicians drain where the vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
In Bideford and still at the pump?
The best spot there is, then — that's where you are. Call, and keep it turned off.