Should You Worry? Petrol in a Diesel Car in Liney
Less than you likely are, provided it hasn't been started. Petrol sitting in a diesel tank does nothing to the engine until something draws it through the system — your ignition priming the pump, your starter, or driving on its own. So the fair answer to the first query everyone around Liney asks, "have I wrecked it?", is normally no. Petrol in Diesel is who to phone, with your engine kept off, and so it stays that way. The remainder of this page covers what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you again.
Petrol in a diesel: what does it do to the engine?
Passing through a motor, diesel is doing two jobs at once. It protects to begin with, and after that does it burn. Built to extremely fine tolerances, the injectors and the pump rely on the diesel moving through them to stop their surfaces wearing against one another.
Badly at the first, not at all at the second: that's petrol. A pump running on a petrol mixture is wearing itself out, since petrol is thinner than diesel and strips out the protection your fuel system relies on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that is where any clattering comes.
Together, those leave the shape of the trouble clear. It's circulation that does the harm, not contact. Where the petrol is only inside that tank, it's a problem of fuel, nothing more. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with your fuel to the fuel injectors further on.
Liney, petrol in a diesel: four cases, from mild to serious
Filled up, never started. The best case there is. Only the tank has petrol in it, and so the job is draining the tank and purging the fuel system where your car sits. This scenario can only really take place at a forecourt: anywhere else, your 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 your tank as far as the fuel filter and your lines. Normally nothing more than draining, purging and sorting the filter, and so still straightforward.
Driven a few miles. Now the pump has spent these miles running on diluted fuel. Miles is only half of that; how hard it was driven counts equally. Either way this work includes the tank, the fuel lines, the fuel filter and fresh fuel through the whole system. The school run to Westonzoyland Community Primary School is one thing. Any miles on the M5, under 3 miles from Liney, means the engine has worked hard throughout, and a run to Wells, under 15 miles away, is a very different task as well.
Knocking, a ragged idle, smoke, a throttle gone soft: driven till it complained. That's your motor telling you its fuel no longer is behaving like diesel. Pull up on the spot — on the verge on Liney Road, at the kerb, down a side road — and don't move it. The drain and flush-through still come first, and they take care of it: when a car is pulled over soon, lasting damage is very unusual.
Myths Liney motorists hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." A fuller tank of the same mix is all it gives, because topping up takes out nothing. The assumption behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. Protection counts more on modern diesels, not less, because their fuel runs through smaller parts at higher pressure.
This is the one that fools motorists. Myth: "If it starts and drives, there's no damage done." The motorist of a petrol motor fed diesel normally stops, because it will not run, and the harm stops with them. While the pump wears, a diesel fed petrol usually starts, idles and drives away as though nothing has happened. A running engine doesn't mean fine.
Myth: "Add some two-stroke oil and drive the car home." It's an old fix for a separate fault. It doesn't put back what petrol has weakened, and that petrol is still in your tank afterwards.
The next start draws petrol back round the pump out of the lines and your filter, where some of that ends up after your engine has run. That is why draining your tank yourself doesn't sort it — a myth. Clearing petrol into a can at the kerbside is also truly hazardous.
How it happens: petrol in a diesel
A careless moment is seldom the cause, and no one means to do it. One way only, because of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol car. That's how the forecourt makes it easy.
Routine and the vehicle falling out of step is when it happens. A new vehicle, a hire car or a courtesy car. One petrol and one diesel on the drive of the same household. Your usual forecourt, its pumps suddenly in a different order. Racing for a train outside Bridgwater and filling up en route. The first fill-up in a diesel Volkswagen Passat after years of driving petrol is exactly 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 has always done.
Liney drivers: how to avoid petrol in a diesel next time
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most usually do. Check the pump's label; the colour is just a hint.
- The first fill in a new car is the time to check your filler flap — inside it, or on the cap, many vehicles state the fuel to use.
- A coloured fob or a sticker on the diesel's key does more than any amount of intending to remember, for a home with one of each.
- It seems silly and it works: on the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump.
- Whilst you are thinking about something else, this is an easy mistake to make — so put the phone away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to refuse a petrol nozzle, and add-on devices are available for motors without one. They are a safety net, not a reason to stop checking the pump.
- Stop as soon as you notice. Less petrol inside your tank means a weaker mixture. It does not change what to do next, which is still not to fire it up.
Liney: already put petrol in a diesel?
In that case, there's just a short order of things. Leave it unstarted, with the ignition off as well. Yet at the forecourt, at Murco or anywhere else? Ask the attendants to help you roll the car away from the pump. Ring 0333 366 0103 next, with three answers — the fuel, the approximate quantity, and if it's run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate problem — Liney has a page all for it.
One petrol in a diesel job in Liney costs more than another. Why?
An honest single price does not exist here: four situations, four separate jobs. Chiefly, the cost moves with which situation you're in. The proportion counts next, meaning how much of your tank is petrol, and then the location of your car and whether reaching it is safe for a technician.
That is why our engineers ask three queries before pricing rather than after: what went in, how much, and whether it has run. Given the answers, there is a straight figure rather than a range.
About Liney itself
Liney is a small suburban area in Somerset, situated inland at a low elevation of around 7 metres. Liney lies near the villages of Bussex, Westonzoyland, and Sutton Mallet, and is approximately 13.6 miles from the city of Wells. Liney is characterized by its predominantly detached housing stock, reflecting its residential nature. Liney is also relatively distant from London, at around 123.7 miles away.
Fuel drain cover across Somerset, Liney included
Our teams answering petrol in diesel call-outs in Liney, in the TA postcode area, equally work the locations near it, Bussex, Westonzoyland and Sutton Mallet included. No need to move the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots where we work.
In Liney and still at the pump?
Then you are in the best position there can be. Ring, and leave it turned off.