Petrol in a Diesel Car in The Bungalows: How Worried Should You Be?
Probably less than you are now — as long as nobody has started the car. "Have I ruined it?" is the first question anyone around The Bungalows asks, and the truthful answer is normally no, since petrol resting in a diesel tank harms nothing till it's dragged through the system — by ignition priming, by your starter, or by driving. To keep it that way, ring Petrol in Diesel then leave your engine alone. What petrol actually does to a diesel, how to gauge how far it has travelled, and how to stop it from happening again: that's the remainder of this page.
Inside your engine: what petrol in a diesel does
Two jobs fall to diesel on its route through a motor. Oiling comes before burning; it does both. Very fine clearances are built into the fuel injectors and your high-pressure pump, and just your diesel running through keeps their surfaces from grinding together.
Poorly at the first, not at all at the second: that is petrol. The rattling comes from petrol being made not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the lubrication the system depends on, and any pump running on that mix is wearing itself.
The shape of the issue is plain once you put those together. It is circulation that causes the damage, not contact. Petrol in the tank is a fuel fault. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with the fuel to your injectors further on.
How bad is petrol in a diesel? Four situations we see around The Bungalows
Fuelled up, never started. The best case there is. That petrol is inside the tank and only the tank, and the job is a drain and a flush where your car sits. This is the one scenario that can only really occur on a forecourt, as anywhere else your car has been driven to get there.
A brief spell of running, or just your ignition on. The system has been primed, so petrol has left that tank and reached the filter and the lines. Usually nothing more than draining, cleaning and sorting the fuel filter, and so still simple.
Those few miles driven meant the pump working on fuel weakened by petrol the whole way. How hard the vehicle was driven counts as much as how far, and this work covers the tank, the lines, your filter and clean fuel through the entire circuit. A school run to Dunston Primary and Nursery Academy is one matter. Any miles on the M1, under 5 miles from The Bungalows, means the motor working hard throughout, and a run to Sheffield, under 10 miles away, makes a very different job too.
Driven until it complained. Knocking, an uneven idle, smoke, a throttle that has gone soft. What you are hearing is your engine signalling fuel that no longer runs like diesel. Leave it wherever it stops: a lay-by, a side street, the verge on The Bungalows. What comes first is still the drain and flush, and that takes care of it, with lasting damage very unusual when a vehicle is stopped quickly.
What The Bungalows 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." Topping up takes out nothing; it gives you a fuller tank of the same mixture. Percentage is not how a diesel fuel system tolerates petrol, whatever that advice supposes.
Myth: a newer diesel copes with a bit of petrol. If anything, the opposite. At higher pressure, through smaller parts: that's how a newer diesel handles its fuel, and so the protection matters for more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that fools people. Diesel in a petrol motor generally leaves a motor that will not run: the driver stops, and so does the harm. A diesel fed petrol normally starts, ticks over and drives away as if nothing has happened, whilst your pump wears. Being able to run is not the same as being fine.
Myth: a two-stroke additive lets you to drive home. It is an old workaround, meant for another problem. That petrol is still in that tank afterwards, and what it has diluted is not put back.
"Drain it yourself and you are sorted" — a myth, because after it's been running some petrol sits in the filter and lines, waiting to go straight back through the pump on the next start. Draining petrol into a can by the kerbside is also genuinely dangerous.
How it happens: petrol in a diesel
It is seldom carelessness, and nobody does it on purpose. One way only, since of the nozzles: the slimmer 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 easy.
When routine and your car stop matching, it occurs. Courtesy car, hire car, or a vehicle that's brand new. One petrol and one diesel on the drive of the same household. A forecourt you know, but with its pumps arranged differently. Filling up in a rush on the way to Chesterfield, with a train to catch. The first fill-up in a diesel Volkswagen Passat after years of driving petrol is precisely the moment it happens. The hand does what it has always done once you add rain, a phone call or a back seat full of kids.
The Bungalows drivers: how to avoid petrol in a diesel next time
- The label is what counts, and so read the petrol pump instead of the colour: in the UK unleaded handles are usually green and diesel black, but not on each forecourt.
- The first fill in a strange motor is the time to check the filler flap — inside it, or on the cap, plenty of motors state which fuel to use.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of meaning to remember, for a home with one of each.
- It sounds daft and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, so put the phone away and keep your mind on the pump.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to reject a petrol nozzle, and aftermarket devices are available for the rest. Treat it as a backstop, and keep checking the pump.
- Noticing it mid-fill? Stop at once. A thinner mix results from less petrol inside the tank, but the next stage remains the same: do not start the vehicle.
Petrol already in a diesel around The Bungalows? Begin here
Then the order of things is short. Starting it is out, and so is switching on the ignition. If you are still at the forecourt — Esso or anywhere else — ask the attendants to help you push the vehicle away from the petrol pump. Next, 0333 366 0103. We'll ask what got in, about how much, and if it has been run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a different issue — The Bungalows has a page just for it.
What makes one The Bungalows petrol in a diesel task cost more than the next
Four different jobs sit behind the four scenarios above — which is why there's no fair single quote. Which of them you are in is chiefly what shifts your cost. The proportion counts next, meaning how much of the tank is petrol, and then the position of your car and whether reaching it is safe for our van.
That's why our engineers ask three questions before quoting rather than after: what got in, how much, and whether it has run. A range becomes a straight figure once the answers are in.
About The Bungalows and its setting
The Bungalows is a locality in Derbyshire, situated inland at an elevation of 114 metres, approximately 8.9 miles from Sheffield. The Bungalows is characterized by its semi-detached housing and is located near other places such as Newbold, Dunston, and Newbold Moor. The Bungalows has a population of around 2744 residents and is part of the wider East Midlands region.
Across Derbyshire and around The Bungalows: fuel drain cover
Newbold, Dunston and Newbold Moor are among the places near The Bungalows that the same teams work, answering petrol in diesel calls across The Bungalows's S postcode area. No need to bring your car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all locations where we work.
At the petrol pump around The Bungalows, right now?
Nothing beats it: that's where you are. Keep it off. Ring.