Should You Worry? Petrol in a Diesel Car in Kersal
Not started? Then less worried than you probably feel. Until the ignition primes your pump, the starter turns, or your vehicle is driven, petrol in a diesel tank just waits there and does nothing. Which means the truthful reply to the first Kersal query — "have I wrecked it?" — usually no. Petrol in Diesel is who to phone, with your engine kept off, and so it remains that way. What petrol really 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 the motor: what petrol in a diesel does
Two tasks fall to diesel on its journey through a motor. It protects to begin with, and only then does it burn. Extremely fine tolerances go into your injectors and your high-pressure pump, and just your diesel running through stops their surfaces grinding together.
Of those two tasks, petrol manages the first badly and the second not at all. Being less viscous than diesel, petrol strips away the protection a fuel system needs, leaving a pump running on that mixture to wear itself. It is also made to resist igniting under compression — the reverse of what a diesel needs — which is where you hear the clattering.
Put those together and the shape of the issue is plain. Not contact but movement is what causes the damage. Where the petrol is only in that tank, it is a fault of fuel, nothing more. The beginning of a mechanical problem is a pump that has been labouring on that petrol — and whatever a worn pump sheds moves on with your fuel to your injectors downstream.
Petrol in a diesel around Kersal: how bad is it? Four cases
Filled up, not once started. The best case there can be. On a forecourt, and really only there, the petrol is still limited to the tank — since anywhere else the vehicle was driven to get to it. The job is emptying and rinsing on the spot.
Started for a moment, or just your ignition on. The fuel system has been primed, so petrol has left that tank and got to your filter and the fuel lines. Drain, flush, see to the filter: still normally simple.
Those few miles driven were your pump labouring on fuel diluted by petrol the whole way. Mileage is only half of that; how hard it was driven counts equally. Either way the work runs to your tank, the lines, the fuel filter and fresh fuel through the whole circuit. Short trips, like the school run to St Paul's CofE Primary School, are one thing. Driving as far as Salford, under 3 miles away, makes a very different job — as does any distance on the M60, under 3 miles from Kersal, with the engine running hard the whole time.
Driven on till it protested — clattering, smoke, an uneven idle, a dead throttle. That's your engine telling you its fuel no longer is acting like diesel. Pull up where you are — on the verge on Moor Lane, at the kerb, down a side road — and don't move it again. A vehicle stopped quickly very seldom has permanent damage, as the fuel drain and the flush, which still go first, deal with it.
Petrol in a diesel myths Kersal people hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing is removed by topping up — you're left with a bigger tank, still the same mix. The idea behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong.
Not so: a newer 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.
Myth: "If it starts and drives, there's no damage done." This is the one that catches people. The motorist of a petrol engine fed diesel usually has no choice but to stop, because it will not run, and the damage stops there. Feed petrol to a diesel and it generally starts, ticks over and pulls away like nothing has happened — all the while its pump is wearing. Fine and running aren't the same thing.
An old fix for a distinct fault is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." That petrol is still inside that tank after that, and whatever it has weakened isn't put back.
Myth: "Drain that tank yourself and you are sorted." Once the motor has been run, some of that petrol is no longer in the tank: it's in the fuel filter and your lines, and it goes right back through the pump at the next start. Clearing petrol into a can by the kerbside is also truly dangerous.
How it happens: petrol in a diesel
A careless moment is seldom the cause, and no one means to do it. The forecourt makes it simple: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle generally will not go into a petrol vehicle at all. So the mistake runs one way.
When routine and the vehicle stop matching, it takes place. A new car, a hire car or a courtesy car. Households running one of each, petrol and diesel. A forecourt you know, only with its pumps laid out differently. A rushed fill en route to Clifton with a train to catch. The first fill-up in a diesel Renault Megane after years of driving petrol is precisely the moment it takes place. With rain, a call coming in, or a car full of children to deal with, your hand simply does what it always has.
How to avoid petrol in a diesel at your next fill-up around Kersal
- A green handle for unleaded and black for diesel is normal in the UK — yet not on every forecourt. Go by the label on the petrol pump, not the colour.
- In a car you don't know, look inside the flap over the filler or at the cap before your first fill: plenty of cars state the fuel there.
- One of each in the household? Label your key to the diesel — a coloured fob, a sticker — because intending to remember is not enough.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It seems daft and it works.
- Mistakes like this are straightforward to make while your mind is on something else, so the phone goes away.
- Some diesels have a filler built to block a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop checking the pump.
- Less petrol makes a thinner mixture, and so stop the moment you notice — while remembering that the next step is unchanged. It is still not to fire it up.
Put petrol in a diesel around Kersal already?
Then the order of things is short. Do not switch your ignition on, and don't fire it up. Ask the staff to help you push it clear of the pump if you are still on the forecourt, whether that is Shell or somewhere else. Phone 0333 366 0103 next, with three facts — the fuel, the rough amount, and if it's run.
Say so if it was AdBlue instead of petrol: it is a separate fault, with its own page for Kersal, because AdBlue brings corrosion and deposits instead of lost lubrication.
One petrol in a diesel task around Kersal costs more than another. Why?
Four separate tasks sit behind the four situations above — which is why there's no fair single quote. Which of them you are in is mostly what shifts your cost. Where your car is counts too, and whether a van can safely get to it, after the share of petrol to what the tank takes.
What was put in, how much, and whether it's run — three questions our technicians ask before quoting, not after, for precisely that reason. A range becomes a straight figure when those replies are in.
About Kersal
Kersal is a suburban area in Greater Manchester, situated on the banks of the River Irwell at an elevation of 73 metres. Kersal lies approximately 2.4 miles from the city of Salford and is surrounded by nearby places such as Rainsough and Hilton Park. Kersal has a population of around 5666 people and is characterised by predominantly semi-detached housing. Kersal is located about 165.5 miles northwest of London.
Fuel drain cover across Greater Manchester, Kersal included
Petrol in diesel calls around Kersal — part of the M postcode area — go to vans that also cover the spots around it, Rainsough, Hilton Park and Lower Kersal among them. The vehicle does not need to come to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
In Kersal and still at the pump?
Then you're in the best place there is. Switched off it stays; then ring.