Should You Worry? Petrol in a Diesel Car in Westhorpe
Far less than you likely are, if it has not been started. Everyone around Westhorpe starts with "have I ruined it?", and the honest answer is generally no: petrol left in the tank of a diesel stays harmless till priming, cranking or driving pulls it into your fuel system. To leave the vehicle that way, call Petrol in Diesel and leave your motor alone. Further down, this page sets out what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you a second time.
What petrol in a diesel does to your engine
On its way through an engine, diesel does two jobs. Oiling comes before burning; it does both. What stops the surfaces inside your high-pressure pump and the fuel injectors from grinding against each other is your diesel passing through them — they are built to extremely fine tolerances.
The second task petrol doesn't do at all, and the first it does badly. A pump working on a petrol mixture is wearing itself out, since petrol is thinner than diesel and strips out the protection the fuel system relies on. Petrol is also made to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that is where the knocking comes.
Taken together, they show what shape the issue takes. Not contact but movement is what causes the harm. A tank with petrol in it is a fuel problem. A pump that has been working on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with your fuel to your injectors downstream.
Petrol in a diesel in Westhorpe: how bad is it? Four cases
Filled up, not once started. The best case there is. Being on a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With that petrol held inside the tank alone, it's drained and rinsed right where it stands, and nothing more is needed.
A moment's running, or just your ignition on. With the system primed, the fuel lines and filter now contain petrol that came from your tank. Usually nothing more than clearing, purging and sorting your filter, and so still simple.
Those few miles driven were the pump running on fuel thinned by petrol throughout. Tank, lines, filter, then fresh fuel put through the whole system: that's this work, and the way the car was driven matters as much as the distance. A school run to Holy Trinity CofE Infant School is one thing. Any mileage on the M1, under 15 miles from Westhorpe, means the engine working hard throughout, and a run to Nottingham, under 15 miles away, is a very different job as well.
Clattering, an uneven idle, smoke, a throttle gone soft: driven until it complained. The fuel is not acting like diesel any more, and the engine is saying so. Whether it's the verge on Westgate, a lay-by or a side street, stop there and leave it. The fuel drain and flush-through still come first, and they sort it out: if a vehicle is pulled over early, permanent damage is very rare.
What Westhorpe drivers get told about petrol in a diesel — and the stories in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing is removed when you top up — your tank simply holds more of the same blend. Percentage is not how a diesel fuel system tolerates petrol, whatever that advice presumes.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. Protection matters more on modern diesels, not less, because their fuel passes through more precise parts at higher pressure.
One myth that catches people out: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it usually will not run, and so the motorist stops — and the damage stops with them. A diesel fed petrol generally starts, ticks over and drives away as though nothing has happened, whilst your pump wears. Being able to run isn't proof of being fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an outdated fix for a separate fault. It doesn't put back what petrol has diluted, and the petrol is still in the tank later.
Myth: "Drain that tank yourself and you are sorted." After your engine has run, some of that petrol is no longer in that tank: it's in the filter and your lines, and it goes right back through the pump on the next start. It's also genuinely hazardous to drain petrol into a can at the roadside.
How it happens: petrol in a diesel
Nobody does it on purpose, and it is rarely carelessness. 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 vehicle at all. The forecourt makes it easy, and the mistake runs one way.
When habit and the vehicle stop matching, it occurs. Courtesy car, hire car, or a vehicle that is new. A household with one petrol and one diesel on the driveway. Your ordinary forecourt, its pumps now in a different order. Filling up in a rush on the way to Fiskerton, with a train to catch. The first fill-up in a diesel Renault Megane after years of driving petrol is exactly the moment it occurs. The hand does what it has always done when you add rain, a phone call or a back seat full of kids.
Preventing petrol in a diesel next time you fill up in Westhorpe
- The label is what counts, so read the petrol pump instead of the colour: in the UK unleaded handles are usually green and diesel black, but not on every forecourt.
- The first fill in a strange vehicle is the time to check the filler flap — inside it, or on the cap, many cars state which fuel they take.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of meaning to remember, for a house with one of each.
- It seems daft and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump.
- While 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 reject a petrol nozzle, and add-on devices exist for vehicles without one. They are a safety net, not a reason to stop checking the pump.
- Less petrol makes a weaker mixture, so stop the moment you realise — though remembering that the next step is unchanged. It is still not to crank it.
Put petrol in a diesel around Westhorpe already?
Short and simple, then, is the order of things. Never start the vehicle, and don't switch the ignition on. The attendants at the forecourt — whether at BP itself or wherever you filled up — will normally help push it away from the pump if you ask. Then ring 0333 366 0103 and tell us what was put in, about how much, and whether it's run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a different issue — Westhorpe has a page just for it.
What makes one Westhorpe petrol in a diesel task cost more than the next
Four separate tasks lie behind the four scenarios above — which is why there's no honest single quote. What moves your cost is chiefly which of them you are in. Two things come after that: the petrol that was put in as a share of what the tank holds, then the place the car is in and whether a technician can reach it safely.
That is why our technicians ask three questions before quoting rather than after: what was put in, how much, and if it has run. With those answers, you get a straight figure rather than a range.
About Westhorpe
Westhorpe is a suburban area in Nottinghamshire, situated near the River Trent at an elevation of around 45 metres. Westhorpe lies on the outskirts of Nottingham, approximately 11 miles from the city centre, and is close to nearby places such as High Town and Southwell. Westhorpe has a population of around 2562 people and is characterised by predominantly detached housing. Westhorpe is also located near Easthorpe, with the larger city of Nottingham providing nearby amenities.
Fuel drain cover across Nottinghamshire, Westhorpe included
Petrol in diesel jobs around Westhorpe — part of the NG postcode area — go to teams that likewise cover the places round it, High Town, Southwell and Easthorpe included. Our engineers drain wherever the vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the pump around Westhorpe?
The best position there is, then — that is where you are. Call, and keep it turned off.