New Lenton: Petrol in a Diesel Car? How Worried to Be
Not started? Then less anxious than you likely are. Petrol resting in a diesel tank does nothing to your motor until something draws it through the fuel system — the ignition priming the pump, the starter, or the drive itself. So the honest answer to the first query anyone around New Lenton asks, "have I ruined it?", is generally no. To keep the car like that, phone Petrol in Diesel then leave your motor alone. The remainder 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 a second time.
Petrol in a diesel: what does it do to the motor?
On its way through an engine, diesel does two tasks. It burns, and before it combusts it lubricates. What stops the surfaces inside the high-pressure fuel pump and the fuel injectors from grinding against one another is your diesel flowing through them — they're built to very fine tolerances.
Badly at the first, not at all at the second: that is petrol. The clattering comes from petrol being designed 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 away the protection the system depends on, and any pump running on such a mixture is wearing itself.
Together, those make the shape of the issue clear. Not contact but movement is what does the harm. A tank with petrol in it is a fuel fault. The beginning of a mechanical one is a pump that has been running on that petrol — and whatever a worn pump sheds travels on with your fuel to the injectors beyond it.
Petrol in a diesel in New Lenton: how serious is it? Four situations
Filled up, and not started: no case is better. Being at a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With that petrol kept in the tank alone, it's drained and purged on the spot, and nothing more is needed.
The ignition turned on, or a brief start. Petrol has come out of the tank and reached the fuel filter and the lines, because your system has been bled. Still normally easy: drain, flush, and the filter sorted.
Those few miles on the road meant the pump running on fuel diluted by petrol throughout. How hard the car was driven counts as much as how far, and the work covers the tank, the lines, the filter and fresh fuel through the whole system. On the school run to Edna G. Olds Academy, the distance is small. Any distance on the M1, under 5 miles from New Lenton, means your engine has worked hard throughout, and a run to Nottingham, under 3 miles away, is a very different task as well.
Driven on until it protested — knocking, smoke, a ragged idle, a dead throttle. The fuel is not behaving like diesel any more, and your engine is telling you. Pull up on the spot — on the verge on Cycle Road, at the kerb, down a side road — and do not move it. What comes first is still the fuel drain and flush-through, and that sorts it out, with long-term damage very uncommon when a car is pulled over soon.
Petrol in a diesel stories New Lenton drivers hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." A fuller tank of the same mixture is all it gives, since topping up takes out nothing. A diesel fuel system doesn't accept petrol by percentage in the way that guidance assumes.
If anything, the opposite holds. Myth: "A modern diesel can cope with a bit of petrol." A newer diesel runs its fuel through more precise parts at higher pressure, which makes the protection count more, not less.
The myth that catches drivers off guard: if it starts and drives, it must be unharmed. Any petrol engine fed diesel normally won't run, and so the motorist stops and the damage stops with them. A diesel fed petrol usually starts, idles and drives away as though nothing has happened, while your pump grinds. A running engine does not mean fine.
An old workaround for a different issue is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." It does not put back what petrol has weakened, and that petrol is still inside the tank after that.
If the motor has run, part of that petrol sits in the filter and the lines, not that tank — and the next start pulls it straight back through your pump. So the myth "drain that tank yourself and you're sorted" doesn't stand up. Draining petrol into a can by the roadside is also genuinely risky.
Why petrol in a diesel takes place at all
No one does it on purpose, and it's seldom carelessness. A diesel nozzle mostly won't go into a petrol motor, yet the smaller petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake easy, and just in that direction.
The moment routine stops matching your car is the moment it happens. Hire cars, courtesy cars, and motors that are new to you. Two vehicles on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A rushed fill on the way to Nottingham with a train to catch. Years of petrol motors behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that is when. Throw in rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
How to prevent petrol in a diesel at your next fill-up in New Lenton
- Green for unleaded and black for diesel is usual in the UK — yet not on each forecourt. Go by the label on the petrol pump, not the colour.
- In a car you do not know, look inside the flap over the filler or at the cap before your first fill: plenty of cars print the fuel there.
- Good intentions do less than a sticker or a fob in a vivid colour on your diesel's key when a home has one of each. So mark it.
- It sounds silly and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump.
- Whilst you're thinking about something else, this is an easy mistake to make — so put your phone away.
- Some diesels come with a filler designed 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.
- Spotting it halfway? Stop there and then. A thinner mixture results from less petrol in that tank, yet your next stage remains the same: do not start the car.
Already put petrol in a diesel around New Lenton?
Then, there is only a short order of things. Don't turn the ignition on, and do not start it. The staff at the forecourt — whether at the nearest petrol station itself or wherever you filled up — will normally help roll it clear of the pump if you ask. Then ring 0333 366 0103 and tell us what got in, about how much, and if it has run.
If it was AdBlue and not petrol, say so. That is a separate issue — corrosion and deposits instead of lost lubrication — and it has its own page for New Lenton.
Why one petrol in a diesel job in New Lenton costs more than another
The four scenarios above are four separate tasks, so no single price for this would be honest. Chiefly, your cost moves with which situation you are in. Where your car is matters too, and whether a van can safely reach it, after the share of petrol to what that tank takes.
What went in, how much, and whether it's run — three questions our engineers ask before pricing, not after, for exactly that reason. A range becomes a straight figure once those answers are in.
About New Lenton
New Lenton is a suburban area situated on the River Leen in Nottinghamshire, with a mix of semi-detached housing and other residential properties. New Lenton lies close to the city centre of Nottingham, being only 1.3 miles away, and is near other suburbs such as Old Lenton and Radford. New Lenton has a population of around 13740 people and is located at an elevation of 31 metres above sea level. New Lenton is part of the wider Nottingham urban area, which is 109.2 miles north of London.
Fuel drain cover in New Lenton and across Nottinghamshire
Petrol in diesel calls in New Lenton — part of the NG postcode area — go to vans that likewise cover the spots round it, Old Lenton, Radford and Dunkirk among them. Our technicians drain where the vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
New Lenton: still at the petrol pump?
Then, you couldn't be in a better place. Keep the car switched off, and ring.