Woodlands: Petrol in a Diesel Car? How Worried to Be
Provided it has not been started, you can worry less than you probably are. Petrol resting in a diesel tank does nothing to your motor until something pulls it through your fuel system — your ignition priming the pump, your starter, or driving itself. So the honest answer to the first query anyone around Woodlands asks, "have I wrecked it?", is normally no. Keep it that way: leave your motor off then call Petrol in Diesel. The rest of this page sets out what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you again.
Petrol in a diesel: what does it do to your engine?
Diesel does two jobs on its way through an engine. It protects to begin with, and only then does it burn. Made to very fine clearances, the injectors and the pump rely on your diesel moving through them to stop their surfaces wearing against one another.
Poorly at the first, not at all at the second: that is petrol. Being less viscous than diesel, petrol strips away the protection a fuel system needs, leaving a pump running on the mixture wearing itself. It's also made to resist igniting under compression — the reverse of what a diesel needs — which is why you get the knocking.
The shape of the trouble is plain when you put those together. The damage is done by circulation, not by contact. Petrol in a tank is a fuel fault. A pump that has been running on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the fuel injectors downstream.
Woodlands, petrol in a diesel: four cases, from mild to major
Fuelled but never started — as good as it gets. Only the tank has petrol in it, so the task is emptying that tank and purging the system where the car sits. This situation can only truly take place at a forecourt: anywhere else, your car got there by being driven.
Ignition on, or started for a second. Once primed, the fuel system has pulled petrol out of that tank up to the fuel filter and the fuel lines. Usually little more than draining, rinsing and sorting your filter, and so still straightforward.
A couple of miles driven, and the pump has spent each of them labouring on weakened fuel. Distance is only half of that; how hard it was driven matters equally. Either way this work runs to the tank, the fuel lines, your filter and fresh fuel through the entire circuit. A school run to Barrowcliff School is one thing. Very different once more: a run to York, under 50 miles away, or any distance on the Petuaria Way, under 50 miles from Woodlands, where the motor kept running hard.
Driven till it protested. Rattling, a ragged idle, smoke, a throttle that has gone soft. What you are hearing is your motor reporting fuel that no longer acts like diesel. Pull up where you are — on the verge on Stepney Drive, at the kerb, down a side road — and do not move it. What goes first is still the drain and flush-through, and that takes care of it, with permanent damage very rare when a vehicle is pulled over soon.
What Woodlands motorists get told about petrol in a diesel — and the stories 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, since topping up removes nothing. That advice supposes a diesel fuel system handles petrol by percentage. It does not.
If anything, the opposite holds. Myth: "A current diesel can cope with a bit of petrol." At higher pressure, through more precise components: that is how a current diesel handles its fuel, so the lubrication matters for more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that fools motorists. The driver of a petrol motor fed diesel normally has no choice but to stop, because it will not run, and the harm stops there. Whilst your pump wears, a diesel fed petrol normally starts, ticks over and drives away as though nothing has happened. A running engine doesn't mean fine.
An outdated workaround for a distinct issue is behind this one. Myth: "Add some two-stroke oil and drive it home." The petrol is still inside the tank afterwards, and what it has weakened isn't put back.
The next start draws petrol back round the pump from the lines and the fuel filter, where some of it sits after the engine has been run. That's why a DIY tank drain does not leave you sorted — a myth. Draining petrol into a can by the kerbside is also genuinely dangerous.
Why petrol in a diesel happens at all
It's rarely carelessness, and no one does it on purpose. One way only, since of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one mostly won't fit a petrol vehicle. That is how the forecourt makes it simple.
The moment habit stops matching the car is the moment it happens. A vehicle that is new to you — a hire car, on loan as a courtesy car, or just bought. One petrol and one diesel on the driveway of the same household. A familiar forecourt with the pumps in a different order. A rushed fill en route to Scarborough with a train to catch. Years of petrol vehicles behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that is when. Throw in a back seat full of children, a phone call or rain, and the hand takes over.
Avoiding petrol in a diesel next time you fill up around Woodlands
- Read the petrol pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on every forecourt. The label is what counts.
- Plenty of motors state the fuel inside the filler flap or on the cap, and so check it on the first fill in any vehicle you do not know.
- Label your key. In a home with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump. It sounds daft and it works.
- Mistakes like this are straightforward to make whilst your mind is on something else, and so your phone goes away.
- Some diesels have a filler designed to block a petrol nozzle, and devices you can add exist for motors without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump.
- The moment you notice, stop: less petrol inside that tank makes a thinner blend. What to do next doesn't change, though — still don't fire it up.
Put petrol in a diesel around Woodlands already?
In that case, there is just a short order of things. Do not switch your ignition on, and don't fire it up. Still on the forecourt, at Penny Petrolium or anywhere else? Ask the staff to help you roll the car away from the petrol pump. Next, 0333 366 0103. We'll ask what got in, about how much, and if it's been run.
If it was AdBlue rather than petrol, say so. That is a different issue — corrosion and deposits rather than lost lubrication — and it has its own page for Woodlands.
Woodlands petrol in a diesel tasks: why one costs more than another
A fair single price doesn't exist here: four scenarios, four separate tasks. The situation itself does most of the work of moving your cost. The proportion counts next, meaning how much of that tank is petrol, followed by the position of the vehicle and whether reaching it is safe for our van.
Before any quote, not after, come three queries: the fuel that went in, its volume, and if it's run. That's why. Those replies are what turn a range into one firm number.
About Woodlands and where it is
Woodlands is a suburban area located on the coast of North Yorkshire, with an elevation of 59 metres above sea level. Woodlands sits near several other local places, including Prospect Mount, Sandybed, and Lady Ediths, and is approximately 34 miles from the city of York. Woodlands has a population of around 3609 people, predominantly living in semi-detached housing. Woodlands is also relatively distant from London, at a distance of 192 miles.
Fuel drain cover across North Yorkshire, Woodlands included
The teams answering petrol in diesel call-outs in Woodlands, in the YO postcode area, equally work the places near it, Prospect Mount, Sandybed and Lady Ediths included. A forecourt, a supermarket car park, a lay-by or your own drive are all places our technicians work, and your car does not need to come to us.
In Woodlands and still at the petrol pump?
Nothing beats it: that is where you are. Switched off it remains; then call.