Marle Green: Petrol in a Diesel Car? How Worried to Be
Probably less than you are now — as long as no one has started the car. Until your ignition primes the pump, the starter cranks, or the vehicle is driven, petrol in a diesel tank simply waits there and does nothing. Which makes the truthful reply to that first Marle Green query — "have I wrecked it?" — usually no. Keep it that way: leave the engine off then ring Petrol in Diesel. Keep reading for three things: the effect petrol has inside a diesel motor, the signs of how far it has spread, and the way to make sure you don't repeat it.
What petrol in a diesel does to the motor
Two tasks fall to diesel on its route round a motor. Before it ignites, it lubricates — and then it combusts. Built to very fine tolerances, the fuel injectors and your pump depend on the diesel moving through them to stop their surfaces wearing against one another.
Of those two tasks, petrol manages the first badly and the second not at all. The clattering comes from petrol being made not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection your system depends on, and any pump working on such a blend is wearing itself.
Together, those leave the shape of the issue clear. It is movement that causes the damage, not contact. Petrol in a tank is a fuel issue. Whatever a worn pump sheds goes on, carried by the fuel, into the fuel injectors further along, which is why a pump that has been working on the petrol is where a mechanical problem starts.
Petrol in a diesel in Marle Green: how bad is it? Four cases
Fuelled but not once started — the best it gets. Being at a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With that petrol held in the tank alone, it's drained and rinsed on the spot, and nothing more is needed.
A moment's running, or merely the ignition on. Once primed, your system has drawn petrol from your tank as far as the fuel filter and the lines. That is usually still a simple job — a drain, a flush, and the filter dealt with.
Your pump now worked a couple of miles on diluted fuel — that is what driving the car meant. The work is the tank, the lines, your filter and fresh fuel through the whole system, and how hard the vehicle was driven counts as much as how far. On the school run to Maynards Green Community Primary School, the miles is small. Any miles on the M23, under 25 miles from Marle Green, means the engine working hard throughout, and a run to Brighton and Hove, under 25 miles away, is a very different task as well.
Driven on until it protested — rattling, smoke, a lumpy idle, a soft throttle. The engine is telling you your fuel is no longer behaving like diesel. Whether it is the verge on Marle Green, a lay-by or a side street, stop where you are then leave it. A vehicle stopped early very seldom has permanent damage, because the fuel drain and the flush, which still come first, take care of it.
Stories Marle Green people hear about petrol in a diesel
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. Topping up removes nothing; it gives you a bigger tank of the same mixture. A diesel fuel system does not accept petrol by percentage in the way that guidance assumes.
"Modern diesels can handle a little petrol" — a myth, and closer to the opposite. A modern diesel runs its fuel through more precise parts at higher pressure, which makes the protection count more, not less.
"It starts, it drives, so no harm done" — the myth that catches more motorists than any other. Feed diesel to a petrol engine and it normally won't run, and so the driver stops — and the damage stops with them. A diesel fed petrol usually starts, ticks over and drives away as if nothing has happened, while your pump wears. Running isn't the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate issue. It doesn't put back what petrol has weakened, and that petrol is still in that tank after that.
"Drain it yourself and you are sorted" — a myth, since after it's been running some petrol lies in the filter and lines, ready to go right back through the pump at your next start. Besides, petrol emptied into a can by the road is genuinely dangerous.
How does petrol in a diesel take place?
No one does it on purpose, and it is rarely carelessness. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle generally will not go into a petrol car at all. So the error runs one way.
It occurs when habit and the car stop matching. A new vehicle, a hire car or a courtesy car. Two motors on one driveway, one petrol, one diesel. A familiar forecourt with the pumps in a different order. Rushing for a train outside Buxted and filling up en route. A new-to-you diesel Volkswagen Tiguan, its first fuelling, and a driver accustomed to petrol: precisely when it takes place. Add rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
Next time you fill up around Marle Green: avoiding petrol in a diesel
- 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 matters.
- Many cars state the fuel type inside your filler flap or on the cap, and so check it on the first fill in a car you do not know.
- One of each in the house? Mark the key to the diesel — a bright fob, a sticker — since intending to remember isn't enough.
- Before the nozzle leaves the petrol pump the first time you fuel a hired or new vehicle, say "diesel" out loud. Silly, yes, but it does the trick.
- Tuck your phone away. This is an easy mistake to make whilst you're thinking about something else.
- Some diesels have a filler built to refuse a petrol nozzle, and devices you can add are available for motors without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the petrol pump.
- As soon as you realise, stop: less petrol in your tank means a thinner mix. What to do next does not change, though — still don't fire it up.
Already put petrol in a diesel in Marle Green?
In that case, there is just a short order of things. Starting it is out, and so is turning on your ignition. If you are still on the forecourt — Local Fuels or anywhere else — ask the staff to help you push the car clear of the pump. What went in, roughly how much, and if it has run: tell us those when you ring 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a separate fault — Marle Green has a page just for it.
Why one petrol in a diesel job in Marle Green costs more than another
Four different jobs sit behind the four situations above — which is why there is no fair single quote. Chiefly, your cost shifts with which situation you're in. The proportion counts next, meaning how much of the tank is petrol, followed by the location of your car and whether getting to it is safe for a van.
What went in, how much, and if it's run — three questions our technicians ask before costing, not after, for exactly that reason. With those replies, there is a straight figure instead of a range.
About Marle Green and where it is
Marle Green is a small hamlet situated in a riverside setting in East Sussex, with an elevation of around 67 metres. Marle Green lies near the villages of Vines Cross and Horam, and is approximately 18.9 miles from Brighton and Hove. Marle Green is characterized by its predominantly detached housing stock, reflecting its rural nature. Marle Green is also relatively close to London, at a distance of around 43.3 miles.
Fuel drain cover across East Sussex, Marle Green included
Petrol in diesel call-outs in Marle Green — part of the TN postcode area — go to teams that also cover the spots around it, Vines Cross, Horam and North Corner included. The car doesn't need to move to us: our engineers drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
In Marle Green and still at the petrol pump?
No position is better: that's where you are. Keep it off. Phone.