How Worried Should You Be? Petrol in a Diesel Car in Farnham Royal
Not started? Then less worried than you likely feel. "Have I wrecked it?" is the first thing everyone in Farnham Royal asks, and the honest answer is usually no, because petrol left in a diesel tank hurts nothing till it is drawn through the system — by ignition priming, by the starter, or by driving. Petrol in Diesel is who to ring, with your motor kept off, and so it stays that way. Read on 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 repeat it.
What petrol in a diesel does to the motor
On its way through a motor, diesel has two tasks. It ignites, and before it combusts it protects. The high-pressure fuel pump and your injectors are built to extremely fine tolerances, and the diesel passing through them is what keeps those surfaces from wearing against each other.
Poorly at the first, not at all at the second: that's petrol. It is thinner than diesel and removes the protection the system hinges on, so a pump running on a petrol blend is a pump wearing itself. And petrol is made to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That is where the clattering comes from.
Put those together and the shape of the trouble is clear. Contact does not do the damage — movement does. Where that petrol is only inside that tank, it's a fault of fuel, nothing more. The beginning of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds moves on with the fuel to the fuel injectors beyond it.
Four scenarios our technicians see in Farnham Royal: how bad is petrol in a diesel?
Fuelled up, not once started. The best case there can be. Just the tank has petrol in it, and so the task is draining that tank and flushing your system where the car stands. This scenario can only truly take place at a forecourt: anywhere else, your car got there by being driven.
A brief spell of running, or just your ignition on. Once primed, the system has drawn petrol out of your tank up to your filter and the lines. Drain, flush, see to the fuel filter: still normally simple.
Driven a few miles. Now your pump has spent those miles working on weakened fuel. Tank, lines, filter, then fresh fuel put through the entire circuit: that is this work, and the way the vehicle was driven matters as much as the mileage. Driving the kids to St Mary's Farnham Royal CofE Primary School is one sort of trip. Getting as far as St Albans, under 25 miles away, makes a very different job — as does any mileage on the Huntercombe Spur, under 3 miles from Farnham Royal, with the motor running hard all the way.
Driven until it protested. Clattering, a lumpy idle, smoke, a throttle that has gone soft. What you are hearing is your motor reporting fuel that no longer runs like diesel. Whether it is the verge on Park Road, a lay-by or a side road, stop there then leave it. Long-term damage is very uncommon if a vehicle is stopped soon, and the drain and flush that still come first deal with it.
Myths Farnham Royal motorists hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing is removed by topping up — you're left with a bigger tank, still the same mixture. The idea behind the guidance — that diesel fuel systems accept petrol by percentage — is wrong.
"Current diesels can handle a little petrol" — a myth, and nearer the opposite. At higher pressure, through smaller components: that is how a newer diesel moves its fuel, so the protection matters more, not less.
One myth that catches motorists out: if it starts and drives, it must be unharmed. Feed diesel to a petrol engine and it generally will not run, and so the driver stops — and the harm stops with them. Feed petrol to a diesel and it generally fires up, idles and drives away as if nothing happened — all the while its pump wears. Running does not mean fine.
An outdated workaround for a distinct fault is behind this one. Myth: "Add some two-stroke oil and drive the car home." That petrol is still in the tank afterwards, and whatever it has thinned isn't put back.
The next start draws petrol back round your pump out of the fuel lines and the fuel filter, where some of that ends up after the engine has run. That is why draining the tank yourself doesn't sort it — a myth. It's also truly hazardous to drain petrol into a can by the kerbside.
Petrol in a diesel: how does it happen?
Nobody does it on purpose, and it's rarely carelessness. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle mostly will not go into a petrol car at all. So the mistake runs one way.
It occurs when habit and your car stop matching. Courtesy car, hire car, or a motor that's new. One petrol and one diesel on the driveway of the same household. A forecourt you know, only with its pumps arranged differently. Filling up in a hurry on the way to Burnham, with a train to catch. Exactly the moment it occurs: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. Add rain, a phone call or a back seat full of children, and your hand repeats what it has always done.
Avoiding petrol in a diesel next time you fill up around Farnham Royal
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most usually do. Read the petrol pump's label; the colour is just a hint.
- The first fill in a strange motor is the time to check the filler flap — inside it, or on the cap, plenty of vehicles state the fuel to use.
- One of each in the home? Mark your key to the diesel — a bright fob, a sticker — because meaning to remember is not enough.
- It sounds silly and it works: on your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Put the phone away. This is an easy mistake to make whilst you're thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler built to reject a petrol nozzle, and add-on devices are available for cars without one. They are a backstop, not a reason to stop reading the pump.
- Stop the moment you realise. Less petrol inside your tank means a weaker blend. It does not change what to do next, which is still not to fire it up.
Put petrol in a diesel in Farnham Royal already?
Then the order of things is brief. Do not turn the ignition on, and don't crank it. Ask the attendants to help you roll it away from the pump if you are still at the forecourt, whether that's Texaco or somewhere else. Then ring 0333 366 0103 and tell us what got in, roughly how much, and whether it has run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate fault — Farnham Royal has a page all for it.
Farnham Royal petrol in a diesel tasks: why one costs more than another
There is no honest single price for this, because the four scenarios above are four separate jobs. The situation itself does most of the work of moving your cost. Two things follow that: the petrol that was put in as a proportion of what your tank takes, then the spot the car is in and whether our van can reach it safely.
Before any quote, not after, we ask three questions: the fuel that went in, its quantity, and whether it's run. That is why. A range becomes a straight figure once the replies are in.
About Farnham Royal
Farnham Royal is a village in Buckinghamshire, situated inland at an elevation of 51 metres, with Farnham Royal being close to several nearby places including Farnham Park and East Burnham. Farnham Royal has a population of approximately 1881 residents, with Farnham Royal predominantly consisting of detached housing. Farnham Royal is located near the city of St Albans, which is 19 miles away, and Farnham Royal is also within commuting distance of London, being 21 miles from the capital.
Fuel drain cover in Farnham Royal and across Buckinghamshire
Petrol in diesel jobs around Farnham Royal — part of the SL postcode area — go to vans that also cover the spots about it, Farnham Park, East Burnham and Britwell among them. No need to move your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots we drain.
Farnham Royal: still at the petrol pump?
Then, you couldn't be in a better spot. Keep the car switched off, and ring.