Petrol in a Diesel Car in Englefield Green: How Worried Should You Be?
Less than you probably are, if it has not been started. Everyone around Englefield Green begins with "have I wrecked it?", and the fair answer is normally no: petrol resting in that tank of any diesel remains harmless till priming, cranking or driving draws it into the fuel system. Keep it that way: leave the engine off then phone Petrol in Diesel. The remainder of this page covers what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you again.
What petrol in a diesel does to the motor
Diesel has two jobs on its way through an engine. It protects first, and only then does it burn. Made to extremely fine clearances, your injectors and your pump rely on the diesel moving through them to stop their surfaces wearing against one another.
The second job petrol does not do at all, and the first it does badly. It's runnier than diesel and removes the protection the system depends on, and so a pump running on a petrol mix is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That's where the rattling comes from.
Seen together, they show what shape the problem has. The harm is done by movement, not by contact. Petrol in the tank is a fuel issue. Whatever a worn pump sheds goes on, carried by the fuel, into your injectors downstream, which is why a pump that has been working on the petrol is where a mechanical issue begins.
Englefield Green, petrol in a diesel: four cases, from mild to major
Fuelled up, never started. The best case there is. At a forecourt, and really only there, that petrol is still confined to that tank — because anywhere else the car was driven to get to it. The task is emptying and flushing on the spot.
Started for a moment, or only the ignition on. Petrol has come out of the tank and reached your filter and the lines, since the system has been primed. Still usually easy: drain, flush, and the filter seen to.
The pump has spent a couple of miles on weakened fuel — that's what driving it meant. The work is the tank, the fuel lines, the fuel filter and fresh fuel through the entire circuit, and how hard the vehicle was driven counts as much as how far. Short trips, such as the school run to St Jude's CofE Infant School, are one thing. Driving as far as Westminster, under 25 miles away, makes a very different task — as does any miles on the M25, under 3 miles from Englefield Green, with the motor working hard all the way.
Driven on till it complained — clattering, smoke, a ragged idle, a soft throttle. What you are hearing is the motor signalling fuel that no longer behaves like diesel. Pull up wherever you are — the verge on Armstrong Road, a lay-by, a side street — and leave the vehicle there. A car pulled over early very rarely has long-term damage, as the fuel drain and the flush, which still come first, take care of it.
What Englefield Green people get told about petrol in a diesel — and the stories in it
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing is removed by topping up — you're left with a bigger tank, still the same mix. Percentage isn't how a diesel fuel system tolerates petrol, however much that advice presumes.
Myth: a current diesel copes with a bit of petrol. Rather, the reverse. A current diesel sends its fuel through smaller parts at higher pressure, which makes the lubrication count more, not less.
This is the one that catches people. Myth: "If it starts and drives, there's no damage done." Feed diesel to a petrol motor and it normally will not run, and so the motorist stops — and the damage stops with them. Feed petrol to a diesel and it usually starts, idles and drives away as if nothing has happened — all the while its pump wears. Fine and running aren't the same at all.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a separate fault. None of what petrol weakened is put back by it — and afterwards, that tank still contains the petrol.
"Drain it yourself and you're sorted" — a myth, because after it's been running some petrol sits in your filter and lines, ready to go right back through your pump at the next start. Also, a can of petrol drained by the roadside is genuinely dangerous.
How petrol ends up: petrol in a diesel
Carelessness is rarely the cause, and nobody means to do it. The forecourt makes it simple: the petrol nozzle is the smaller of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle mostly won't go into a petrol motor at all. So the mistake runs one way.
It occurs when routine and the car stop matching. A car that's new to you — a hire car, on loan as a courtesy car, or just bought. Two cars on one drive, one petrol, one diesel. A forecourt you know, only with its pumps laid out differently. A rushed fill on the way to Egham with a train to catch. A new-to-you diesel Volkswagen Passat, its first fuelling, and a driver accustomed to petrol: precisely when it occurs. The hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
Next time you fill up around Englefield Green: avoiding petrol in a diesel
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most generally do. Read the petrol pump's label; the colour is only a clue.
- Many vehicles state the fuel inside the filler flap or on the cap, and so check there on your first fill in a motor you do not know.
- A coloured fob or a sticker on the diesel's key does more than any amount of intending to remember, in a household with one of each.
- "Diesel", aloud, before you pick up the nozzle — every time a new or hired car gets its first tank. It sounds silly. It does the trick.
- Mistakes like this are easy to make whilst your mind is on something else, and so your phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to refuse a petrol nozzle, and add-on devices exist for cars without one. They are a backstop, not a reason to stop reading the pump.
- The moment you realise, stop: less petrol in the tank means a thinner blend. What to do next doesn't change, though — still do not fire it up.
Put petrol in a diesel in Englefield Green already?
In that case, there's just a short order of things. Leave it unstarted, with the ignition off too. Yet on the forecourt, at BP or anywhere else? Ask the attendants to help you push the car away from the pump. Then ring 0333 366 0103 and tell us what got in, roughly how much, and whether it's run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a separate problem — Englefield Green has a page just for it.
Englefield Green petrol in a diesel tasks: why one costs more than another
An honest single quote does not exist here: four scenarios, four separate tasks. The scenario itself does most of the work of moving the cost. Where your car is matters too, and whether a technician can safely get to it, after the ratio of petrol to what your tank holds.
Three queries come first, before quoting, instead of after — what was put in, how much, has it run — and this is the reason. The replies turn a range into a straight figure.
About Englefield Green, for a moment
Englefield Green is a suburban area in Surrey, situated inland at an elevation of around 65 metres, and is located approximately 19.8 miles from London. Englefield Green has a mix of housing types, but is predominantly characterised by detached homes. Englefield Green is near several notable places, including Royal Holloway and the village of Egham. Englefield Green has a population of around 8240 residents.
Across Surrey and in Englefield Green: fuel drain cover
Petrol in diesel call-outs in Englefield Green — part of the TW postcode area — go to teams that likewise cover the places round it, Royal Holloway, Ripley Springs and Egham included. The vehicle does not need to move to us: our technicians drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
Still at the petrol pump around Englefield Green?
The best position there is, then — that's where you are. Keep it off. Ring.