How Worried Should You Be? Petrol in a Diesel Car in Haigh Fold
Less than you probably are, if it hasn't been started. Everyone in Haigh Fold begins with "have I wrecked it?", and the fair answer is normally no: petrol left inside your tank of any diesel remains harmless until priming, cranking or driving draws it into the system. To keep the vehicle like that, call Petrol in Diesel then leave your engine switched off. 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 again.
Petrol in a diesel: what does it do to the engine?
On its way through an engine, diesel does two jobs. It lubricates to begin with, and only then does it burn. What keeps the surfaces inside the high-pressure fuel pump and your injectors from grinding against each other is the diesel passing through them — they are made to extremely fine tolerances.
Poorly at the first, not at all at the second: that's petrol. It's thinner than diesel and removes the protection your fuel system rests on, and so a pump running on a petrol mix is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the rattling comes from.
Put those together and the shape of the trouble is plain. The harm is done by movement, not by contact. Petrol in a tank is a fuel issue. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with the fuel to the injectors further on.
Four scenarios our technicians see around Haigh Fold: how bad is petrol in a diesel?
Filled up, and never started: no case is better. The petrol is inside that tank and just your tank, and the task is a drain and a flush where the vehicle sits. This is the one situation that can only really happen on a forecourt, as anywhere else your car has been driven to get there.
A moment's running, or merely your ignition on. Petrol has come out of that tank and reached the fuel filter and the fuel lines, since the system has been primed. Drain, flush, deal with the filter: still usually straightforward.
Those few miles on the road were the pump labouring on fuel weakened by petrol throughout. Tank, lines, filter, then fresh fuel put through the whole system: that's the work, and the way the vehicle was driven matters as much as the miles. The school run to St Luke's CofE Primary School is one matter. A run as far as Bradford, under 3 miles away, is a very different job. So is any mileage on the M606, under 5 miles from Haigh Fold, where the motor has been running hard the whole time.
It complained, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone lumpy. What you are hearing is your motor signalling fuel that no longer acts like diesel. Whether it's the verge on Whitaker Avenue, a lay-by or a side street, stop where you are then leave it. Permanent damage is very rare when a car is stopped soon, and the fuel drain and flush-through that still go first sort it out.
Myths Haigh Fold drivers hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up takes out nothing; it gives you a bigger tank of the same mixture. Percentage is not how a diesel fuel system copes with petrol, however much that advice supposes.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through finer components: that's how a current diesel handles its fuel, so the protection counts for more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there's no damage done." The driver of a petrol engine fed diesel normally stops, since it will not run, and the damage stops there. A diesel fed petrol usually starts, idles and drives away as though nothing has happened, while the pump wears. Running does not mean fine.
An old workaround for a distinct issue is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." What petrol has diluted stays thinned, and that petrol remains inside your tank regardless.
The next start sends petrol back round your pump out of the lines and the fuel filter, where some of that ends up once the engine has run. That's why a DIY tank drain doesn't sort it — a myth. Draining petrol into a can at the roadside is also really risky.
Petrol in a diesel: how does it take place?
On purpose? Never. Through carelessness? Rarely, if ever. The petrol nozzle is the smaller of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol motor at all. The forecourt makes it easy, and the mistake runs one way.
It happens when habit and the vehicle stop matching. Hire cars, courtesy cars, and motors that are new to you. One petrol and one diesel on the driveway of the same household. Your normal forecourt, its pumps now in a different order. A train to catch, and a rushed fill on the way to Bradford Forster Square. A new-to-you diesel Volkswagen Passat, its first fuelling, and a driver accustomed to petrol: precisely when it happens. Your hand does what it has always done once you add rain, a phone call or a back seat full of children.
Avoiding petrol in a diesel next time you fill up in Haigh Fold
- A green handle for unleaded and black for diesel is usual in the UK — but not on every forecourt. Trust the label on the pump, not the colour.
- Many motors state the fuel type inside your filler flap or on the cap, so check it on your first fill in a vehicle you don't know.
- Good intentions count for less than a sticker or a fob in a bright colour on the diesel's key when a house has one of each. So label it.
- "Diesel", aloud, before you lift the nozzle — every time a new or hired car gets its first tank. It seems silly. It works.
- While you are thinking about something else, this is an easy mistake to make — so put your phone away.
- Some diesels come with a filler built to refuse a petrol nozzle, and devices you can add exist for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the pump.
- Less petrol means a thinner blend, and so stop the moment you notice — though remembering that the next step is unchanged. It is still not to fire it up.
Petrol already in a diesel in Haigh Fold? Start here
Then, there's just a short order of things. Don't switch the ignition on, and don't crank it. Still on the forecourt, at Texaco or anywhere else? Ask the attendants to help you roll it away from the pump. What got in, roughly how much, and whether it has run: tell us that when you ring 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a separate issue — Haigh Fold has a page all for it.
Haigh Fold petrol in a diesel tasks: why one costs more than another
An honest single quote doesn't exist here: four situations, four separate tasks. Mostly, your cost shifts with which situation you are in. Where the vehicle is counts too, and whether our van can safely reach it, after the proportion of petrol to what the tank takes.
Before any quote, not after, come three queries: the fuel that went in, the amount, and if it has run. That is why. The answers change a range into a straight figure.
About Haigh Fold, for a moment
Haigh Fold is a suburban area situated near the city of Bradford in West Yorkshire, with Haigh Fold being located close to the riverside at an elevation of around 185 metres. Haigh Fold is characterised by its semi-detached housing and is part of the larger urban area surrounding Bradford. Haigh Fold is close to nearby places such as Moorside, Fagley, and Undercliffe, and is approximately 2 miles from Bradford city centre.
Haigh Fold and West Yorkshire: where our fuel drain cover runs
The vans answering petrol in diesel calls around Haigh Fold, in the BD postcode area, also work the spots near it, Moorside, Fagley and Undercliffe included. Our technicians 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 Haigh Fold?
The best position there is, then — that's where you are. Switched off it stays; then call.