Green Street Green: Petrol in a Diesel Car? How Worried to Be
If it hasn't been started, worry less than you probably are. Till the ignition primes the pump, the starter cranks, or your vehicle is driven, petrol in a diesel tank just sits there and does nothing. Which makes the honest reply to the first Green Street Green question — "have I ruined it?" — normally no. Keep it like that: leave the engine off then call Petrol in Diesel. Below, this page sets out what petrol really does inside a diesel, how far it may have gone, and how to stop it happening to you again.
Petrol in a diesel: what does it do to the engine?
Passing through an engine, diesel is doing two jobs at the same time. It burns, and before it ignites it protects. Extremely fine tolerances are built into the fuel injectors and your high-pressure pump, and just your diesel flowing through keeps those surfaces from grinding together.
The second job petrol doesn't do at all, and the first it does badly. Being less viscous than diesel, petrol strips out the protection a fuel system needs, so a pump on the mixture wearing itself. It is also made to resist igniting under compression — the reverse of what a diesel needs — which is why you hear the clattering.
Taken together, they make clear what shape the issue has. It's circulation that causes the harm, not contact. Where that petrol is only inside the tank, it is a problem of fuel, nothing more. Whatever a worn pump sheds travels on, borne by the fuel, into your injectors downstream, which is why a pump that has worked on that petrol is where a mechanical fault starts.
Petrol in a diesel in Green Street Green: how bad is it? Four situations
Fuelled up, not once started. The best case there is. Being at a forecourt is what makes this the case: elsewhere, the car has been driven there to begin with. With that petrol kept inside your tank alone, it's drained and flushed on the spot, and nothing more is needed.
Ignition on, or started for a moment. Petrol has left the tank and reached your filter and the lines, since the system has been bled. That's usually still a straightforward job — a drain, a flush, and the fuel filter dealt with.
Those few miles driven were the pump running on fuel diluted by petrol the whole way. Tank, lines, filter, then clean fuel put through the entire circuit: that's the work, and the way the vehicle was driven matters as much as the distance. Short trips, like the school run to Green Street Green Primary School, are one thing. Very different once more: a run to London, under 15 miles away, or any distance on the M25, under 3 miles from Green Street Green, where the motor kept running hard.
Driven till it protested. Rattling, a ragged idle, smoke, a throttle that has gone soft. That's the engine telling you its fuel has stopped acting like diesel. Whether it's the verge on Lezayre Road, a lay-by or a side street, stop where you are then leave it. What goes first is still the fuel drain and flush-through, and that takes care of it, with lasting damage very rare when a vehicle is pulled over early.
Green Street Green drivers and the petrol in a diesel myths they hear
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Topping up takes out nothing; it gives you a fuller tank of the same mixture. That guidance assumes a diesel fuel system tolerates petrol by percentage. It doesn't.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through finer parts: that is how a modern diesel handles its fuel, and so the protection matters more, not less.
The myth that catches motorists off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it usually won't run, so the motorist stops — and the harm stops with them. A diesel fed petrol usually starts, ticks over and drives away as if nothing has happened, while your pump wears. Being able to run is not proof of being fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an outdated fix for a distinct fault. That petrol is still in the tank after that, and whatever it has diluted isn't 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, ready to go right back through your pump at your next start. It is also truly hazardous to drain petrol into a can at the kerbside.
How does petrol in a diesel take place?
It's rarely carelessness, and no one does it on purpose. A diesel nozzle generally will not fit a petrol car, yet the slimmer petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake simple, and only in that direction.
It happens when habit and your car stop matching. A new motor, a hire car or a courtesy car. One petrol and one diesel on the drive of the same household. A forecourt you know, but with its pumps arranged differently. A train to catch, and a rushed fill on the way to Chelsfield. Years of petrol vehicles behind you, a diesel Volkswagen Passat in front of you on the forecourt for its first tank — that's when. Add rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
How to avoid petrol in a diesel at your next fill-up in Green Street Green
- The label is what counts, so read the petrol pump rather than the colour: in the UK unleaded handles are usually green and diesel black, but not on every forecourt.
- The first fill in an unfamiliar motor is the time to check your filler flap — inside it, or on the cap, plenty of vehicles state the fuel to use.
- Mark your key. In a household with one of each, a coloured fob or a sticker on your 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" aloud before you lift the nozzle off the pump. It sounds daft and it works.
- Mistakes like this are straightforward to make whilst your mind is on something else, so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to reject a petrol nozzle, and aftermarket devices are available for the remainder. Treat it as a safety net, and keep reading the pump.
- The moment you notice, stop: less petrol in that tank means a weaker blend. What to do next does not change, though — still do not crank it.
Green Street Green: already put petrol in a diesel?
The order of things is short, then. Leave it unstarted, with the ignition switched off as well. If you are still at the forecourt — Shell or anywhere else — ask the staff to help you push the vehicle clear of the petrol pump. Ring 0333 366 0103 next, with three answers — your fuel, the approximate quantity, and whether it has run.
If it was AdBlue rather than petrol, say so. That's a different issue — corrosion and deposits and not lost protection — and it has its own page for Green Street Green.
What makes one Green Street Green petrol in a diesel task cost more than the next
There's no honest single price for this, since the four situations above are four different jobs. Chiefly, the cost moves with which one you're in. Where the car is matters too, and whether a van can safely get to it, after the share of petrol to what the tank takes.
Three questions come first, before any quote, rather than after — what went in, how much, has it run — and this is the reason. The replies change a range into a straight figure.
About Green Street Green
Green Street Green is a suburban area in Greater London, situated approximately 14 miles from central London. Green Street Green has a population of around 4171 people and is characterised by predominantly detached housing. Green Street Green is located near several other suburban areas, including Chelsfield, Farnborough, and Pratts Bottom, and sits at an elevation of 78 metres. Green Street Green is a residential community on the outskirts of London, with the nearest city being London itself, about 13.6 miles away.
Fuel drain cover across Greater London, Green Street Green included
Chelsfield, Farnborough and Pratts Bottom are among the spots near Green Street Green that the same teams work, answering petrol in diesel jobs across Green Street Green's BR postcode area. You need not move the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations we drain.
Green Street Green: still at the petrol pump?
The best position there is, then — that is where you are. Keep it off. Phone.