Scot Lane End: Petrol in a Diesel Car? How Worried to Be
Provided it has not been started, worry far less than you probably are. Petrol sitting in a diesel tank does nothing to the motor until something pulls it through the system — your ignition priming the pump, the starter, or the drive on its own. So the truthful answer to the first question everyone in Scot Lane End asks, "have I ruined it?", is usually no. Leave the motor off then phone Petrol in Diesel — that is how you keep it like that. Keep reading for three things: the effect petrol has inside a diesel engine, the clues of how far it has spread, and the way to make sure you never do it again.
Petrol in a diesel: what does it do to the engine?
Diesel has two jobs on its way through a motor. It burns, and before it combusts it protects. The high-pressure pump and the fuel injectors are made to very fine gaps, and your diesel passing through them is what keeps those surfaces from grinding against one another.
Of those two tasks, petrol handles the first badly and the second never. The knocking comes from petrol being designed 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 the fuel system hinges on, and any pump running on such a mix is wearing itself.
Seen together, they make clear the 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 travels on, carried by your fuel, into the injectors further along, which is why a pump that has worked on that petrol is where a mechanical problem starts.
Petrol in a diesel in Scot Lane End: how serious is it? Four situations
The best case there is: filled up, not once started. Only that tank has petrol in it, so the task is emptying the tank and cleaning the system where your car stands. This situation can only really take place on a forecourt: anywhere else, the car got there by being driven.
A brief spell of running, or merely the ignition on. Once primed, the fuel system has pulled petrol from that tank up to the filter and your lines. Normally nothing more than clearing, rinsing and seeing to the filter, so still straightforward.
Driven a few miles. Now the pump has spent those miles labouring on weakened fuel. Distance is only half of it; how hard it was driven counts just as much. Either way this work includes the tank, the fuel lines, the fuel filter and fresh fuel through the entire system. Short trips, such as the school run to Blackrod Primary School, are one thing. A run as far as Salford, under 15 miles away, is a very different job. So is any miles on the M61, under a mile from Scot Lane End, where your engine has been running hard throughout.
Driven until it complained. Clattering, an uneven idle, smoke, a throttle that has gone soft. The fuel isn't behaving like diesel any more, and the motor is saying so. Leave it wherever it stops: a lay-by, a side street, the verge on Manchester Road. The drain and flush still come first, and they deal with it: if a car is stopped quickly, permanent damage is very uncommon.
Petrol in a diesel stories Scot Lane End people hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Nothing comes out when you top up — that tank simply holds more of the same blend. The assumption behind that guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. Finer parts and higher pressure are how a current diesel runs its fuel, and that makes the protection count more, not less.
Myth: "If it starts and drives, there's no harm done." This is the one that fools drivers. Feed diesel to a petrol motor and it normally will not run, so the motorist stops — and the damage stops with them. Feed petrol to a diesel and it normally starts, idles and drives away like nothing has happened — all the while its pump wears. Running does not mean fine.
Not so: a two-stroke additive lets you to drive home. It is an old fix, supposed for another issue. The petrol is still in the tank afterwards, and whatever it has weakened isn't put back.
If the engine has been run, part of that petrol sits in your filter and the lines, not the tank — and the next start sends it right back through the pump. So the myth "drain that tank yourself and you are sorted" doesn't stand up. Clearing petrol into a can by the roadside is also really risky.
How does petrol in a diesel happen?
Carelessness is seldom the cause, and nobody means to do it. The forecourt makes it simple: the petrol nozzle is the slimmer 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.
The moment habit stops matching your car is the moment it takes place. A car that's new to you — a hire car, on loan as a courtesy car, or just bought. Households running one of each, petrol and diesel. Your usual forecourt, its pumps now in a different order. A hurried fill en route to Blackrod with a train to catch. The first fill-up in a diesel Renault Megane after years of driving petrol is precisely the moment it happens. Add rain, a phone call or a back seat full of kids, and the hand does what it has always done.
How to avoid petrol in a diesel at your next fill-up around Scot Lane End
- Check the pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on every forecourt. The label is what counts.
- The first fill in a new vehicle is the time to check your filler flap — on it, or on the cap, many motors state which fuel they take.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of meaning to remember, in a household with one of each.
- It sounds silly and it does the trick: on your first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away and keep your mind on the petrol pump.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject a petrol nozzle, and add-on devices exist for vehicles without one. They are a safety net, not a reason to stop reading the pump.
- As soon as you realise, stop: less petrol in your tank makes a thinner mix. What to do next does not change, though — still do not start the car.
Petrol already in a diesel in Scot Lane End? Start here
Short and simple, then, is the order of things. Do not turn the ignition on, and do not start it. The staff on the forecourt — whether at BP itself or wherever you filled up — will normally help roll it clear of the pump if you ask. Then ring 0333 366 0103 and tell us what got in, roughly how much, and if it has run.
Say so if it was AdBlue rather than petrol: it's a separate problem, with its own page for Scot Lane End, because AdBlue brings corrosion and deposits rather than lost lubrication.
Scot Lane End petrol in a diesel jobs: why one costs more than another
There's no honest single quote for this, because the four situations above are four separate jobs. What shifts the cost is chiefly which of them you are in. Two things follow that: the petrol that got in as a share of what that tank holds, then the place the car is in and whether our van can reach it safely.
Before any quote, not after, come three queries: the fuel that was put in, its amount, and if it's run. That is why. A range becomes a straight figure when the answers are in.
About Scot Lane End, for a moment
Scot Lane End is a suburban area in Greater Manchester, situated near the riverside with an elevation of 126 metres. Scot Lane End lies approximately 13 miles from Salford and 176 miles from London, with nearby places including Hilton House, Haigh, and Aspull. Scot Lane End has a population of around 1116 people, predominantly living in semi-detached housing. Scot Lane End is characterized by its residential community and local amenities.
Across Greater Manchester and in Scot Lane End: fuel drain cover
Scot Lane End rests in the BL postcode area, and the teams that answer petrol in diesel jobs there work the spots near it as well — Hilton House, Haigh and Aspull among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations our technicians drain, and the vehicle doesn't need to move to us.
At the pump around Scot Lane End, right now?
In that case, you couldn't be in a better position. Ring, and keep it switched off.