Should You Worry? Petrol in a Diesel Car in New Boultham
Likely less than you are now — as long as nobody has started the car. Petrol sitting in a diesel tank does nothing to the motor till something draws it through the fuel system — the ignition priming your pump, the starter, or the drive on its own. So the honest answer to the first query everyone in New Boultham asks, "have I ruined it?", is normally no. Petrol in Diesel is who to call, with the engine kept off, so it stays that way. The rest 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 does not happen to you again.
Petrol in a diesel: what does it do to your engine?
On its way through a motor, diesel does two jobs. It protects first, and after that does it burn. What stops the surfaces inside the high-pressure pump and the fuel injectors from grinding against each other is the diesel passing through them — they're made to extremely fine tolerances.
Petrol does the first task poorly and the second not at all. The rattling comes from petrol being designed not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips away the protection your system rests on, and any pump running on such a mixture is wearing itself.
Put those together and the shape of the trouble is clear. It's movement that does the damage, not contact. All a tank with petrol in it amounts to is a fuel fault. Whatever a worn pump sheds goes on, carried by your fuel, into the fuel injectors further along, which is why a pump that has been working on that petrol is where a mechanical issue starts.
Petrol in a diesel in New Boultham: how bad is it? Four cases
Fuelled, and never started: nothing beats it. At a forecourt, and really only there, the petrol is still confined to your tank — because everywhere else the car was driven to reach it. The task is draining and flushing on the spot.
A moment's running, or merely the ignition on. Petrol has come out of that tank and got to the fuel filter and your lines, because the fuel system has been primed. Normally nothing more than emptying, purging and sorting the filter, and so still straightforward.
Those few miles driven were your pump labouring on fuel thinned by petrol the whole way. The work is the tank, the lines, the filter and clean fuel through the entire system, and how hard the car was driven counts as much as how far. Driving the children to The Lincoln St Peter at Gowts Church of England Primary School is one kind of trip. Any distance on the M180, under 25 miles from New Boultham, means your engine working hard throughout, and a run to Lincoln, under a mile away, is a very different task too.
Driven on till it complained — clattering, smoke, an uneven idle, a dead throttle. The fuel isn't behaving like diesel any more, and your motor is telling you. Pull up wherever you are — the verge on Centaur Road, a lay-by, a side street — and leave the vehicle there. What goes first is still the fuel drain and flush-through, and that takes care of it, with long-term damage very uncommon if a vehicle is pulled over early.
Stories New Boultham drivers hear about petrol in a diesel
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. A fuller tank of the same mixture is all it gives, because topping up removes nothing. That guidance presumes 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. Smaller parts and higher pressure are the way a modern diesel runs its fuel, and that makes the protection matter more, not less.
"It starts, it drives, and so no harm done" — the myth that trips up more drivers than any other. Feed diesel to a petrol motor and it generally won't run, and so the motorist stops — and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile your pump grinds. Running isn't the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a different problem. None of what petrol diluted is put back by it — and afterwards, that tank still contains the petrol.
Once your engine has been run, part of the petrol is in the filter and your lines, not that tank — and the next start pulls it straight back through your pump. So the myth "drain the tank yourself and you are sorted" does not hold. It's also genuinely risky to drain petrol into a can at the roadside.
How does petrol in a diesel take place?
A careless moment is seldom the cause, and no one means to do it. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol motor at all. The forecourt makes it easy, and the error runs one way.
When routine and the car stop matching, it happens. Hire cars, courtesy cars, and vehicles that are new to you. Households running one of each, petrol and diesel. Your usual forecourt, its pumps now in a different order. Racing for a train at Lincoln Central and fuelling up en route. Exactly the moment it occurs: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Your hand repeats what it has always done once you add rain, a phone call or a back seat full of children.
Next time you fill up in New Boultham: avoiding petrol in a diesel
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Check the petrol pump's label; the colour is just a hint.
- In a car you don't know, look inside the flap over your filler or at the cap before your first fill: many motors print the fuel type there.
- A coloured fob or a sticker on your diesel's key does more than any amount of intending to remember, for a house with one of each.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the petrol pump. It seems daft and it works.
- Mistakes like this are easy to make whilst your mind is on something else, and so your phone goes away.
- Some diesels have a filler built to refuse a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the petrol pump.
- Less petrol makes a thinner blend, so stop as soon as you realise — though remembering that your next step is unchanged. It's still not to fire it up.
Petrol already in a diesel around New Boultham? Start here
Then the order of things is brief. Don't crank it, and do not turn your ignition on. If you're still at the forecourt — Morrisons or anywhere else — ask the staff to help you push the vehicle clear of the petrol pump. Next, 0333 366 0103. We will ask what went in, roughly how much, and if it has been run.
If it was AdBlue rather than petrol, say so. That's a different fault — corrosion and deposits and not lost protection — and it has its own page for New Boultham.
Why one petrol in a diesel job in New Boultham costs more than another
There's no honest single quote for this, since the four situations above are four separate jobs. The scenario itself does most of the work of moving your cost. Beyond that it's the share — how much petrol got in against how much your tank takes — and after that where the car is and whether a technician can get to it safely.
What got in, how much, and if it's run — three queries we ask before pricing, not after, for precisely that reason. Given the replies, there is a straight figure rather than a range.
About New Boultham itself
New Boultham is a suburban area located on the outskirts of Lincoln, situated near the River Witham in Lincolnshire. New Boultham sits at a low elevation of around 8 metres, with the city of Lincoln just under a mile away. New Boultham is characterized by its predominantly flat housing stock, with nearby neighbourhoods including St Catherines and Boultham.
New Boultham and Lincolnshire: where our fuel drain cover reaches
St Catherines, Boultham and Lincoln are among the locations around New Boultham that the same vans work, answering petrol in diesel call-outs across New Boultham's LN postcode area. Our engineers drain where the car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
At the petrol pump in New Boultham, right now?
The best place there is, then — that's where you are. Keep it off. Call.