Petrol in a Diesel Car in Devizes: How Worried Should You Be?
Provided it hasn't been started, worry far less than you likely are. "Have I wrecked it?" is the first thing anyone in Devizes asks, and the honest answer is usually no, because petrol left in a diesel tank hurts nothing till it's drawn through your fuel system — by ignition priming, by your starter, or by driving. Keep it like that: leave your engine off then ring Petrol in Diesel. What petrol actually does to a diesel, how to gauge how far it's travelled, and how to stop it from happening again: that is the rest of this page.
The engine and petrol in a diesel: what goes on
Two jobs fall to diesel on its journey round a motor. It combusts, and before it ignites it protects. Built to extremely fine gaps, the injectors and the pump rely on your diesel flowing through them to stop their surfaces wearing against one another.
Of those two tasks, petrol manages the first badly and the second never. The rattling comes from petrol being made not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips out the protection the fuel system hinges on, and any pump working on that mixture is wearing itself.
The shape of the trouble is clear once you put those together. The damage is done by movement, not by contact. A tank with petrol in it is a fuel issue. Whatever a worn pump sheds goes on, borne by the fuel, into the fuel injectors downstream, which is why a pump that has worked on that petrol is where a mechanical problem starts.
Four scenarios our engineers see in Devizes: how serious is petrol in a diesel?
Fuelled, and not started: no case is better. Being at a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With the petrol kept in your tank alone, it is cleared and purged on the spot, and nothing more is needed.
Ignition on, or started for a moment. Your system has been bled, and so petrol has left that tank and got to the fuel filter and the fuel lines. That's usually still an easy job — a drain, a flush, and the fuel filter seen to.
Your pump now worked a couple of miles on weakened fuel — that's what driving the vehicle meant. How hard the car was driven matters as much as how far, and this work takes in that tank, your lines, the filter and fresh fuel through the entire circuit. On the school run to Southbroom Infants' School, the miles is short. Any distance on the M4, under 15 miles from Devizes, means your engine working hard throughout, and a run to Bath, under 25 miles away, is a very different task too.
Driven till it protested. Knocking, a lumpy idle, smoke, a throttle that has gone soft. The motor is telling you your fuel is no longer acting like diesel. Pull up wherever you are — the verge on The Market Place, a lay-by, a side street — then leave the car where it is. The fuel drain and flush still go first, and they take care of it: when a vehicle is pulled over quickly, long-term damage is very unusual.
Devizes motorists and the petrol in a diesel stories they hear
False: topping up to full with diesel makes it fine. It doesn't. Nothing is removed by topping up — you are left with a fuller tank, still the same mixture. A diesel fuel system does not tolerate petrol by percentage in the way that guidance presumes.
Not so: a modern diesel copes with a bit of petrol. Rather, the reverse. At higher pressure, through more precise components: that is how a current diesel handles its fuel, so the lubrication matters more, not less.
This is the one that catches motorists. Myth: "If it starts and drives, there is no damage done." Feed diesel to a petrol engine and it generally will not run, and so the driver stops — and the harm stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile your pump wears. A running engine doesn't mean fine.
Myth: a two-stroke additive lets you to drive home. It was an old fix, supposed for another fault. It does not put back what petrol has diluted, and the petrol is still inside the tank later.
If the motor has been run, part of that petrol is in the filter and your lines, not your tank — and your next start sends it right back through the pump. So the myth "drain your tank yourself and you're sorted" doesn't hold. Besides, petrol drained into a can by the road is truly dangerous.
Petrol in a diesel: how does it happen?
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle generally will not go into a petrol car, yet the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake easy, and only in that direction.
The moment routine stops matching the vehicle is the moment it happens. Courtesy car, hire car, or a motor that is new. Two vehicles on one driveway, one petrol, one diesel. Your ordinary forecourt, its pumps suddenly in a different order. A train to catch, and a hurried fill on the way to Melksham. Precisely the moment it takes place: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. Add a back seat full of kids, a phone call or rain, and the hand takes over.
How to avoid petrol in a diesel at your next fill-up around Devizes
- The label is what matters, and so read the pump instead of the colour: in the UK unleaded handles are usually green and diesel black, but not on each forecourt.
- Many motors state the fuel inside the filler flap or on the cap, so check it on the first fill in any car you do not know.
- Good intentions count for less than a sticker or a fob in a bright colour on your diesel's key when a house has one of each. So mark it.
- Before the nozzle leaves the pump the first time you fill a hired or new motor, say "diesel" out loud. Daft, yes, but it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, so put your phone away and keep your mind on the pump.
- Add-on devices exist for motors without one, and some diesels are built with a filler that won't take a petrol nozzle. Useful — but a backstop only, never a reason to stop checking the label.
- Stop as soon as you notice. Less petrol inside your tank makes a weaker mixture. It does not change what to do next, which is still not to crank it.
Already put petrol in a diesel around Devizes?
In that case, there's only a short order of things. Leave it unstarted, with your ignition switched off as well. Ask the staff to help you roll it away from the petrol pump if you're still on the forecourt, whether that is Esso or anywhere else. What got in, about how much, and if it's run: tell us that when you phone 0333 366 0103.
If it was AdBlue rather than petrol, say so. That is a separate issue — corrosion and deposits instead of lost protection — and it has its own page for Devizes.
Devizes petrol in a diesel tasks: why one costs more than another
The four scenarios above are four different tasks, so no single quote for this would be fair. Mostly, the cost shifts with which one you're in. Where the vehicle is matters too, and whether a technician can safely reach it, after the ratio of petrol to what your tank holds.
Ahead of any quote, not after, come three questions: the fuel that got in, its amount, and whether it's run. That is why. A range becomes a straight figure once those replies are in.
About Devizes itself
Devizes is a town in Wiltshire, situated on the banks of the Kennet and Avon Canal, with the town centre at an elevation of around 133 metres. Devizes has a mix of housing types, but semi-detached homes are particularly prevalent, reflecting the town's growth during various periods of development. Devizes is located near several smaller communities, including Nursteed, Roundway, and Tanis, and is within commuting distance of the city of Bath. Devizes has a population of approximately 13834 people, making it a significant urban centre in the area.
Fuel drain cover around Devizes and across Wiltshire
Petrol in diesel calls around Devizes — part of the SN postcode area — go to teams that also cover the places around it, Nursteed, Roundway and Tanis included. The vehicle does not need to move to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
At the petrol pump in Devizes, still?
Then you are in the best place there can be. Keep it switched off, and ring.