How Worried Should You Be? Petrol in a Diesel Car in New Whittington
Far less than you likely are, provided it hasn't been started. Until the ignition primes the pump, the starter turns, or your car is driven, petrol in a diesel tank just waits there and does no harm. Which means the honest reply to the first New Whittington question — "have I ruined it?" — usually no. To leave the vehicle that way, call Petrol in Diesel then leave your motor switched off. Further down, this page sets out what petrol really does inside a diesel, how far it might have gone, and how to stop it happening to you again.
Inside your engine: what petrol in a diesel really does
Diesel does two tasks on its way through an engine. It burns, and before it combusts it protects. Built to extremely fine clearances, the injectors and your pump rely on your diesel flowing through them to stop their surfaces wearing against one another.
The second job petrol doesn't do at all, and the first it does badly. The clattering comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips away the lubrication your 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. It's circulation that does the harm, not contact. Where that petrol is only in the tank, it is an issue of fuel, nothing more. After the pump has been running on that petrol, a mechanical fault has begun: anything shed by a pump that is wearing is carried onward to the injectors with your fuel.
How serious is petrol in a diesel? Four scenarios we see around New Whittington
The best case there is: filled up, never started. Being at a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With the petrol held in the tank alone, it's emptied and cleaned on the spot, and nothing more is needed.
Started for a moment, or only your ignition on. Petrol has left that tank and got to your filter and the fuel lines, because your system has been bled. Normally little more than draining, rinsing and sorting your filter, so still simple.
Your pump now worked a couple of miles on weakened fuel — that's what driving the car does. Tank, lines, filter, then fresh fuel run through the whole system: that is the work, and the way your car was driven matters as much as the distance. Driving the children to New Whittington Community Primary School is one sort of trip. A run as far as Sheffield, under 10 miles away, is a very different job. So is any mileage on the M1, under 5 miles from New Whittington, where the engine has been labouring hard the whole time.
Driven on until it protested — rattling, smoke, a lumpy idle, a soft throttle. The fuel isn't acting like diesel any more, and your engine is telling you. Pull up on the spot — on the verge on Handley Road, at the kerb, down a side road — and don't move it. A vehicle pulled over early very rarely has permanent damage, since the fuel drain and the flush-through, which still go first, take care of it.
Myths New Whittington motorists hear about petrol in a diesel
"Top it up the rest of the way with diesel and it will be fine" — a myth. It will not. Topping up removes nothing; it gives you a bigger tank of the same mixture. That guidance assumes a diesel fuel system tolerates petrol by percentage. It does not.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. More precise parts and higher pressure are the way a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
This is the one that catches motorists. Myth: "If it starts and drives, there's no damage done." Diesel in a petrol motor usually means a motor that won't run: the driver stops, and so does the damage. Whilst the pump wears, a diesel fed petrol usually starts, idles and drives away as if nothing has happened. 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 distinct problem. What petrol has weakened stays thinned, and the petrol remains inside the tank anyway.
Once the motor has run, part of the petrol sits in your filter and your lines, not the tank — and your next start sends it straight back through your pump. So the myth "drain your tank yourself and you're sorted" doesn't stand up. Besides, petrol drained into a can by the road is genuinely risky.
Petrol in a diesel: how does it happen?
Carelessness is rarely the cause, and no one means to do it. The petrol nozzle is the narrower of the two and slides 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 simple, and the error runs one way.
Routine and the vehicle getting out of step is when it takes place. A new motor, a hire car or a courtesy car. Households running one of each, petrol and diesel. A well-known forecourt with the pumps in a different order. Filling up in a hurry on the way to Chesterfield, with a train to catch. Years of petrol cars behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that is when. Your hand repeats 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 around New Whittington
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Check the pump's label; the colour is only a clue.
- Many cars state the fuel type inside your filler flap or on the cap, and so check there on your first fill in any vehicle you do not know.
- A coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember, in a house with one of each.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump. It seems daft and it does the trick.
- Tuck your phone away. This is an easy mistake to make while you are thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to refuse a petrol nozzle, and aftermarket devices exist for the remainder. Treat it as a backstop, then keep checking the pump.
- Less petrol means a thinner mix, and so stop the moment you realise — while remembering that your next step is unchanged. It is still not to start the vehicle.
Already put petrol in a diesel around New Whittington?
Then, there's just a short order of things. Don't fire it up, and don't turn the ignition on. Ask the attendants to help you push it clear of the petrol pump if you're still on the forecourt, whether that's JET or somewhere else. Then call 0333 366 0103 and tell us what went in, roughly how much, and if it has run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate problem — New Whittington has a page all for it.
What makes one New Whittington petrol in a diesel task cost more than the next
An honest single quote doesn't exist here: four situations, four separate tasks. The scenario itself does most of the work of moving the cost. Beyond that it is the proportion — how much petrol went in against how much your tank holds — and after that where the vehicle is and whether our van can reach it safely.
That's why our engineers ask three queries before quoting rather than after: what got in, how much, and if it has run. Those answers are what turn a range into one firm number.
About New Whittington, for a moment
New Whittington is a suburban area in Derbyshire, situated approximately 7.7 miles from Sheffield, with a mix of semi-detached housing and local amenities. New Whittington sits inland, at an elevation of around 106 metres, and is close to nearby places such as Old Whittington and Nether Handley. New Whittington has a population of around 3203 people, and is located within the East Midlands region, about 133.6 miles from London.
Fuel drain cover around New Whittington and across Derbyshire
Old Whittington, Nether Handley and Hundall are among the places near New Whittington that the same teams work, answering petrol in diesel call-outs across New Whittington's S postcode area. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots we drain, and your vehicle doesn't need to move to us.
New Whittington: still at the petrol pump?
No position is better: that's where you now are. Turned off it remains; then call.