Linlithgow Bridge: Petrol in a Diesel Car? How Worried to Be
Probably less than you already are — provided no one has started the car. "Have I wrecked it?" is the first question everyone around Linlithgow Bridge asks, and the honest answer is normally no, since petrol resting in a diesel tank harms nothing until it is drawn through your fuel system — by ignition priming, by the starter, or by being driven. Keep it that way: leave your motor off then call Petrol in Diesel. What petrol really does to a diesel, how to gauge how far it has gone, and how to stop it from happening again: that's the rest of this page.
Petrol in a diesel: what does it do to your engine?
Two tasks fall to diesel on its journey through a motor. Before it combusts, it protects — and then it burns. Extremely fine clearances are built into the injectors and your high-pressure pump, and only your diesel running through stops their surfaces grinding together.
The second job petrol doesn't do at all, and the first it does poorly. It's runnier than diesel and removes the lubrication the fuel system hinges on, so a pump running on a petrol mix 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's where the rattling comes from.
Combined, those make the shape of the issue plain. The harm is done by movement, not by contact. Where that petrol is only inside your tank, it is a problem of fuel, nothing more. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with your fuel to the fuel injectors downstream.
Linlithgow Bridge, petrol in a diesel: four situations, from mild to serious
Filled but never started — the best it gets. That petrol is in that tank and just that tank, and the task is a drain and a flush where the vehicle sits. This is the one scenario that can only really occur at a forecourt, since anywhere else the car has been driven to get there.
The ignition turned on, or a short start. Once primed, the system has drawn petrol from the tank up to your filter and the lines. Drain, flush, see to the filter: still usually simple.
Driven a couple of miles. Now your pump has spent these miles labouring on weakened fuel. How hard the car was driven matters as much as how far, and this work covers the tank, the fuel lines, your filter and clean fuel through the whole circuit. A school run to the local primary school is one matter. Very different a second time: a run to Dunfermline, under 10 miles away, or some mileage on the M9, under a mile from Linlithgow Bridge, where the motor never stopped running hard.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone ragged. That is your motor telling you its fuel has stopped behaving like diesel. Pull up wherever you are — the verge on Mill Road, a lay-by, a side street — and leave the vehicle where it is. What comes first is still the fuel drain and flush-through, and that deals with it, with permanent damage very uncommon when a vehicle is stopped soon.
What Linlithgow Bridge motorists get told about petrol in a diesel — and the myths in it
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing is removed when you top up — that tank simply carries more of the same blend. A diesel fuel system does not accept petrol by percentage in the way that advice supposes.
"Modern diesels can handle a little petrol" — a myth, and closer to the opposite. Finer components and higher pressure are the way a current diesel runs its fuel, and that makes the lubrication count more, not less.
Myth: "If it starts and drives, there is no damage done." This is the one that fools people. A petrol engine fed diesel usually won't run, so the driver stops and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile the pump wears. Fine and running are not the same at all.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a different fault. None of what petrol thinned is put back by it — and afterwards, the tank still holds that petrol.
Myth: "Drain your tank yourself and you are sorted." Once the motor has run, some of that petrol is no longer in that tank: it is in the filter and the lines, and it goes straight back through your pump on the next start. It's also really risky to drain petrol into a can at the roadside.
Petrol in a diesel: how does it take place?
No one does it on purpose, and it is seldom carelessness. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol motor at all. The forecourt makes it easy, and the error runs one way.
Habit and the car falling out of step is when it occurs. Hire cars, courtesy cars, and cars that are new to you. Households running one of each, petrol and diesel. Your usual forecourt, its pumps suddenly in a different order. A train to catch, and a hurried fill en route to Linlithgow. Years of petrol vehicles behind you, a diesel Renault Clio in front of you on the forecourt for its first tank — that is when. Your hand does what it has always done when you add rain, a phone call or a back seat full of children.
Linlithgow Bridge people: how to prevent petrol in a diesel next time
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most generally do. Check the pump's label; the colour is only a clue.
- Inspect the filler flap. Many cars state the fuel inside the flap or on the cap. Look at it on your first fill in a vehicle you do not know.
- Label the key. In a house with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It seems daft and it works.
- Whilst you're thinking about something else, this is an easy mistake to make — so put your phone 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 are available for cars without one. They are a safety net, not a reason to stop reading the pump.
- Spotting it halfway? Stop there and then. A thinner blend follows from less petrol in your tank, but the next step remains the same: don't fire it up.
Linlithgow Bridge: already put petrol in a diesel?
The order of things is brief, then. Starting it is out, and so is switching on the ignition. Still on the forecourt, at BP or anywhere else? Ask the staff to help you push it away from the petrol pump. Call 0333 366 0103 next, with three facts — the fuel, the approximate quantity, and if it's run.
Corrosion and deposits form the issue with AdBlue, whereas petrol means lost lubrication. So if it was AdBlue, say so — and read its own Linlithgow Bridge page.
One petrol in a diesel job around Linlithgow Bridge costs more than another. Why?
The four scenarios above are four separate tasks, so no single price for this would be honest. The scenario itself does most of the work of moving the cost. Two things follow that: the petrol that got in as a proportion of what the tank takes, then the place the car is in and whether a technician can reach it safely.
What was put in, how much, and whether it's run — three queries our technicians ask before pricing, not after, for precisely that reason. With those replies, there is a straight figure rather than a range.
About Linlithgow Bridge
Linlithgow Bridge is a suburban area in West Lothian, situated near the coast and approximately 9 miles from Dunfermline. Linlithgow Bridge sits at an elevation of 49 metres, with detached housing being the predominant type of accommodation in the area. Linlithgow Bridge is located near several nearby places, including Whitecross, Linlithgow, and Belsyde, and is home to a population of around 2517 people.
Fuel drain cover around Linlithgow Bridge and across West Lothian
Petrol in diesel jobs around Linlithgow Bridge — part of the EH postcode area — go to vans that also cover the spots about it, Whitecross, Linlithgow and Belsyde included. Our technicians drain where your vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
In Linlithgow Bridge and still at the pump?
No position is better: that's where you are. Keep the vehicle turned off, and ring.