Should You Worry? Petrol in a Diesel Car in Netherend
Unstarted? Then less worried than you probably feel. "Have I ruined it?" is the first thing everyone around Netherend asks, and the honest answer is normally no, because petrol left in a diesel tank harms nothing till it's dragged through your fuel system — by ignition priming, by the starter, or by driving. Leave your motor off then ring Petrol in Diesel — that is how you keep it that way. Keep reading for three things: the effect petrol has inside a diesel engine, the signs of how far it has got, and ways to make sure you never do it again.
What petrol in a diesel does to the engine
Diesel has two tasks on its way through a motor. Before it ignites, it lubricates — and then it burns. What keeps the surfaces inside the high-pressure fuel pump and your injectors from wearing against each other is the diesel passing through them — they're designed to extremely fine clearances.
Poorly at the first, not at all at the second: that is petrol. It's thinner than diesel and removes the protection the system hinges on, and so a pump running on a petrol blend is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That's where the clattering comes from.
The shape of the trouble is clear once you put those together. Contact doesn't do the harm — circulation does. Where the petrol is only in that tank, it is an issue of fuel, nothing more. The start of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with the fuel to the fuel injectors downstream.
Petrol in a diesel around Netherend: how bad is it? Four situations
Fuelled but never started — the best it gets. That petrol is in that tank and just your tank, and the job is a drain and a flush where the vehicle sits. This is the one scenario that can only really occur at a forecourt, as anywhere else the car has been driven to get there.
The ignition turned on, or a brief start. With your system primed, your lines and filter already hold petrol that has come from your tank. Drain, flush, deal with your filter: still usually easy.
A few miles driven, and your pump has spent each of them running on thinned fuel. The work is the tank, the lines, the fuel filter and clean fuel through the entire circuit, and how hard your car was driven matters as much as how far. The school run to Woolaston Primary School is one thing. A run as far as Bristol, under 25 miles away, is a very different task. So is any distance on the M48, under 10 miles from Netherend, where the engine has been labouring hard throughout.
Driven till it complained. Rattling, a ragged idle, smoke, a throttle that has gone soft. That is the motor telling you its fuel has stopped behaving like diesel. Leave it where it stops: a lay-by, a side street, the verge on Bridge View. Permanent damage is very uncommon when a car is stopped early, and the drain and flush that still come first deal with it.
What Netherend motorists get told about petrol in a diesel — and the myths in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Topping up removes nothing; it gives you a bigger tank of the same mixture. A diesel fuel system doesn't tolerate petrol by percentage in the way that advice supposes.
If anything, the opposite holds. Myth: "A newer diesel can cope with a bit of petrol." Smaller components and higher pressure are how a newer diesel runs its fuel, and that makes the lubrication count more, not less.
"It starts, it drives, and so no harm done" — the myth that trips up more drivers than any other. The driver of a petrol motor fed diesel usually stops, because it will not run, and the damage stops with them. Feed petrol to a diesel and it normally fires up, ticks over and pulls away like nothing happened — all while its pump wears. Being able to run isn't proof of being fine.
Myth: "Add some two-stroke oil and drive it home." It's an outdated fix for a separate fault. That petrol is still inside that tank after that, and whatever it has thinned isn't put back.
The next start draws petrol back round the pump from the lines and the filter, where some of that sits after your engine has been run. That's why a DIY tank drain doesn't sort it — a myth. Also, a can of petrol drained at the roadside is genuinely hazardous.
How does petrol in a diesel take place?
It is seldom carelessness, and no one does it on purpose. One way only, since of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one mostly won't fit a petrol motor. That is how the forecourt makes it straightforward.
The moment habit stops matching the car is the moment it occurs. Hire cars, courtesy cars, and vehicles that are new to you. Two motors on one driveway, one petrol, one diesel. Your usual forecourt, its pumps suddenly in a different order. Rushing for a train at Lydney and filling up en route. Years of petrol vehicles behind you, a diesel Renault Clio in front of you on the forecourt for its first tank — that's when. Your hand does what it has always done when you add rain, a phone call or a back seat full of children.
How to prevent petrol in a diesel on your next fill-up in Netherend
- The label is what counts, so read the pump instead of the colour: in the UK unleaded handles are normally green and diesel black, but not on each forecourt.
- Many vehicles state the fuel type inside your filler flap or on the cap, so check there on your first fill in any motor you don't know.
- Good intentions count for less than a sticker or a fob in a vivid colour on your diesel's key if a home has one of each. So mark it.
- "Diesel", out loud, before you pick up the nozzle — every time a new or hired car gets its first tank. It sounds silly. It does the trick.
- Tuck the phone away. This is an easy mistake to make while you're thinking about something else.
- Some diesels have a filler designed to refuse a petrol nozzle, and devices you can add exist for vehicles 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 mix, so stop as soon as you realise — while remembering that the next stage is unchanged. It is still not to fire it up.
Petrol already in a diesel around Netherend? Begin here
The order of things is brief, then. Leave it unstarted, with the ignition off too. Ask the staff to help you roll it away from the petrol pump if you are still at the forecourt, whether that's BP or somewhere else. What was put in, about how much, and if it has run: tell us those when you call 0333 366 0103.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a different problem — Netherend has a page just for it.
One petrol in a diesel job in Netherend costs more than another. Why?
A fair single quote doesn't exist here: four situations, four separate tasks. What shifts the cost is mostly which of them you are in. Beyond that it is the share — how much petrol got in against how much your tank takes — and then where the vehicle is and whether a van can reach it safely.
Ahead of any quote, not after, we ask three queries: your fuel that got in, the volume, and if it has run. That's why. The replies change a range into a straight figure.
About Netherend itself
Netherend is a small suburban area in Gloucestershire, situated near the coast and approximately 17 miles from Bristol. Netherend has a population of around 830 people and is characterised by predominantly detached housing. Netherend sits at an elevation of 47 metres, close to nearby places such as Woolaston and Brookend.
Fuel drain cover across Gloucestershire, Netherend included
The teams answering petrol in diesel call-outs in Netherend, in the GL postcode area, equally work the locations near it, Woolaston, Smallbrook and Brookend among them. No need to move your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places we drain.
In Netherend and still at the pump?
Then you're in the best position there can be. Keep it off. Call.