Fell Lane: Petrol in a Diesel Car? How Worried to Be
If it has not been started, worry less than you likely are. Petrol sitting in a diesel tank does nothing to the motor till something draws it through the fuel system — your ignition priming your pump, the starter, or the drive on its own. So the honest answer to the first query everyone in Fell Lane asks, "have I ruined it?", is usually no. Leave your motor off and phone Petrol in Diesel — that is how you keep it like that. The remainder of this page covers what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you a second time.
Your engine and petrol in a diesel: what happens
Two jobs fall to diesel on its route through a motor. It ignites, and before it burns it protects. Very fine gaps are built into your injectors and your high-pressure pump, and just your diesel flowing through stops those surfaces grinding together.
Poorly at the first, not at all at the second: that is petrol. A pump working on a petrol mixture is wearing itself out, since petrol is runnier than diesel and strips out the protection the fuel system depends on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that is where the clattering starts.
Together, those make the shape of the trouble clear. It's movement that causes the damage, not contact. Petrol in the tank is a fuel problem. A pump that has been working on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with your fuel to your injectors downstream.
Petrol in a diesel around Fell Lane: how bad is it? Four cases
Fuelled, and not started: no case is better. Only that tank has petrol in it, so the task is draining the tank and purging your system where your car sits. This scenario can only really take place on a forecourt: anywhere else, the vehicle got there by being driven.
Ignition on, or started for a second. Petrol has come out of the tank and got to your filter and your lines, since the fuel system has been primed. Usually nothing more than clearing, rinsing and seeing to the filter, so still straightforward.
Those few miles driven were your pump working on fuel diluted by petrol throughout. Tank, lines, filter, then fresh fuel put through the whole system: that is the work, and the way the vehicle was driven counts as much as the mileage. The school run to Beckfoot Nessfield is one matter. Driving as far as Bradford, under 10 miles away, makes a very different job — as does any miles on the M606, under 10 miles from Fell Lane, with the motor labouring hard all the way.
Driven until it complained. Knocking, a lumpy idle, smoke, a throttle that has gone soft. The engine is telling you your fuel is no longer behaving like diesel. Leave it where it has stopped: a lay-by, a quiet street, the verge on Fell Crescent. A vehicle stopped soon very rarely has permanent damage, since the fuel drain and the flush-through, which still go first, sort it out.
What Fell Lane people get told about petrol in a diesel — and the myths in it
False: topping up to full with diesel makes it fine. It doesn't. A bigger tank of the same mix is all it gives, because topping up takes out nothing. Percentage isn't how a diesel fuel system tolerates petrol, however much that advice assumes.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." A newer diesel sends its fuel through more precise components at higher pressure, which makes the protection count more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that fools drivers. The driver of a petrol motor fed diesel usually has no choice but to stop, since it will not run, and the harm stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile the pump grinds. Running doesn't mean fine.
An old workaround for a separate issue lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." What petrol has thinned remains thinned, and that petrol stays in the tank anyway.
The next start sends petrol back round the pump from the lines and your filter, where some of it ends up after your engine has been run. That is why a DIY tank drain doesn't leave you sorted — a myth. Clearing petrol into a can at the roadside is also genuinely risky.
Petrol in a diesel: how does it happen?
On purpose? Never. Through carelessness? Seldom, if ever. One way only, because of the nozzles: the narrower petrol one slides inside a diesel filler with almost no resistance, while the diesel one generally won't fit a petrol motor. That's how the forecourt makes it simple.
When habit and your car stop matching, it occurs. Hire cars, courtesy cars, and vehicles that are new to you. One petrol and one diesel on the drive of the same household. Your ordinary forecourt, its pumps now in a different order. A rushed fill en route to Keighley with a train to catch. Precisely the moment it takes place: after years of driving petrol, a driver fills a diesel Volkswagen Passat for the first time. The hand repeats what it has always done when you add rain, a phone call or a back seat full of kids.
Fell Lane people: how to prevent petrol in a diesel next time
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Check the pump's label; the colour is just a clue.
- Many motors state the fuel inside the filler flap or on the cap, so check it on the first fill in a motor you do not know.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of intending to remember, for a household with one of each.
- Before the nozzle comes off the pump the first time you fill a hired or new motor, say "diesel" out loud. Daft, yes, yet it works.
- Whilst you're thinking about something else, this is an easy mistake to make — so put your phone away.
- Some diesels have a filler built to refuse a petrol nozzle, and devices you can add are available for motors without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the petrol pump.
- As soon as you realise, stop: less petrol inside that tank means a weaker mix. What to do next doesn't change, though — still don't crank it.
Petrol already in a diesel in Fell Lane? Begin here
The order of things is short, then. Starting it is out, and so is turning on the ignition. If you're still on the forecourt — the nearest petrol station or anywhere else — ask the attendants to help you push it away from the pump. Next, 0333 366 0103. We'll ask what was put in, about how much, and if it has been run.
Corrosion and deposits are the issue with AdBlue, where petrol brings lost lubrication. So if it was AdBlue, say so — and see its own Fell Lane page.
One petrol in a diesel job in Fell Lane costs more than another. Why?
An honest single quote doesn't exist here: four scenarios, four separate tasks. Chiefly, your cost moves with which one you're in. Next it's the ratio — how much petrol was put in against how much the tank takes — and then where the vehicle is and whether a technician can reach it safely.
What went in, how much, and whether it's run — three questions our engineers ask before pricing, not after, for precisely that reason. Their answers are what change a range into one firm number.
About Fell Lane and where it is
Fell Lane is a locality situated in a riverside setting in West Yorkshire, with an elevation of around 184 metres. Fell Lane lies approximately 8.7 miles from Bradford and is near to other local places such as Exley Head and Guard House. Fell Lane has a population of around 3452 people and predominantly consists of semi-detached housing. Fell Lane is also located about 179.3 miles from London, making it a relatively distant suburb.
Fuel drain cover in Fell Lane and across West Yorkshire
Petrol in diesel call-outs in Fell Lane — part of the BD postcode area — go to teams that also cover the locations about it, Exley Head, Guard House and New Town among them. The vehicle does not need to move to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
In Fell Lane and still at the petrol pump?
Then, you could not be in a better spot. Leave it switched off, and ring.