Should You Worry? Petrol in a Diesel Car in Southfield
Likely less than you are now — as long as no one has started it. "Have I wrecked it?" is the first thing everyone in Southfield asks, and the truthful answer is usually no, since petrol left in a diesel tank hurts nothing until it's drawn through the fuel system — by ignition priming, by the starter, or by being driven. Petrol in Diesel is who to phone, with the engine left off, and so it remains that way. Keep reading for three things: the effect petrol has inside a diesel engine, the signs of how far it has got, and the way to make sure you never repeat it.
Your engine and petrol in a diesel: what goes on
On its way through a motor, diesel does two jobs. Before it burns, it protects — then it combusts. Extremely fine tolerances go into your injectors and the high-pressure fuel pump, and just your diesel flowing through keeps those surfaces from grinding together.
The second job petrol doesn't do at all, and the first it does badly. Being less viscous than diesel, petrol strips out the protection a fuel system needs, so a pump on the mixture to wear itself. It is also made to resist igniting under compression — the opposite of what a diesel needs — which is where you hear the rattling.
Combined, those make the shape of the problem clear. It's circulation that causes the damage, not contact. Where the petrol is only inside the tank, it's an issue of fuel, nothing more. A pump that has been running on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with your fuel to the injectors downstream.
Petrol in a diesel in Southfield: how bad is it? Four cases
Fuelled up, never started. The best case there can be. Just the tank has petrol in it, so the job is emptying that tank and purging the system where the vehicle sits. This scenario can only truly take place at a forecourt: anywhere else, your car got there by being driven.
Started for a moment, or only the ignition on. With the system primed, your lines and filter now contain petrol that came from the tank. Usually nothing more than emptying, cleaning and seeing to the filter, and so still simple.
A few miles driven, and your pump has spent each of them working on diluted fuel. How hard the vehicle was driven matters as much as how far, and this work takes in the tank, the fuel lines, your filter and clean fuel through the whole system. Driving the children to St Nicholas Church School is one kind of trip. Any miles on the M32, under 15 miles from Southfield, means your engine working hard throughout, and a run to Bath, under 10 miles away, is a very different job too.
Clattering, a lumpy idle, smoke, a throttle gone soft: driven till it complained. The fuel is not behaving like diesel any more, and the motor is saying so. Pull up wherever you are — the verge on Queen's Road, a lay-by, a side street — and leave the vehicle there. A car stopped soon very seldom has lasting damage, since the fuel drain and the flush, which still go first, deal with it.
What Southfield people get told about petrol in a diesel — and the stories in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Nothing is removed by topping up — you're left with a fuller tank, still the same mix. The assumption behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong.
If anything, the opposite is true. Myth: "A modern diesel can cope with a bit of petrol." Lubrication matters more on newer diesels, not less, since their fuel passes through smaller components at higher pressure.
Myth: "If it starts and drives, there's no damage done." This is the one that catches people. Feed diesel to a petrol motor and it generally will not run, and so the motorist stops — and the harm stops with them. Feed petrol to a diesel and it normally fires up, ticks over and pulls away like nothing happened — all the while its pump is wearing. Running is not the same as fine.
An old fix for a different problem is behind this one. Myth: "Add some two-stroke oil and drive it home." None of what petrol thinned is put back by it — and later, your tank still contains that petrol.
Once the motor has been run, part of that petrol sits in the filter and your lines, not that tank — and the next start sends it straight back through the pump. So the myth "drain your tank yourself and you're sorted" doesn't stand up. Draining petrol into a can at the roadside is also truly risky.
Why petrol in a diesel happens at all
It is seldom carelessness, and no one does it on purpose. A diesel nozzle generally will not go into a petrol vehicle, yet the slimmer petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake easy, and just in that direction.
When routine and the car stop matching, it occurs. A motor that is new to you — a hire car, on loan as a courtesy car, or just bought. Households running one of each, petrol and diesel. The pumps in a different order on a well-known forecourt. A train to catch, and a hurried fill on the way to Oldfield Park. The first fill-up in a diesel Renault Clio after years of driving petrol is precisely the moment it occurs. Throw in rain, a phone call or a back seat full of children, and the hand does what it has always done.
Next time you fill up in Southfield: avoiding petrol in a diesel
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Read the pump's label; the colour is just a clue.
- The first fill in an unfamiliar motor is the time to check your filler flap — on it, or on the cap, plenty of motors state which fuel to use.
- Good intentions count for less than a sticker or a fob in a vivid colour on your diesel's key when a house has one of each. So label it.
- "Diesel", out loud, before you lift the nozzle — every time a new or hired car gets its first tank. It seems daft. It does the trick.
- Thinking about something else is when this becomes an easy mistake to make, so put the phone away then keep your mind on the petrol pump.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to reject a petrol nozzle, and aftermarket devices exist for the rest. Count it as a safety net, then keep checking the pump.
- Less petrol makes a weaker mix, so stop the moment you notice — while remembering that your next step is unchanged. It is still not to crank it.
Put petrol in a diesel around Southfield already?
In that case, there's only a short order of things. Leave it unstarted, with your ignition off too. If you are still on the forecourt — Shell or anywhere else — ask the staff to help you roll the car clear of the petrol pump. Call 0333 366 0103 next, with three facts — your fuel, the approximate quantity, and if it has run.
Corrosion and deposits are the issue with AdBlue, whereas petrol means lost lubrication. So if it was AdBlue, say so — and read its own Southfield page.
What makes one Southfield petrol in a diesel task cost more than the next
The four situations above are four different tasks, so no single price for this would be honest. Chiefly, the cost moves with which situation you are in. Two things follow that: the petrol that got in as a share of what your tank holds, then the place the vehicle is in and whether a van can get to it safely.
That is why we ask three questions before quoting instead of after: what went in, how much, and whether it's run. Those answers turn a range into a straight figure.
About Southfield, for a moment
Southfield is a suburban area in Somerset, situated on the riverside at an elevation of 118 metres, with terraced housing being the predominant type of accommodation. Southfield lies close to the city of Bath, approximately 7.3 miles away, and is also near to other nearby places such as Northfield, Fox Hills, and Writhlington. Southfield has a population of around 3731 residents and is located in the South West region of England, about 100.7 miles from London.
Southfield and Somerset: where our fuel drain cover reaches
Northfield, Fox Hills and Writhlington are among the spots near Southfield that the same teams work, answering petrol in diesel call-outs across Southfield's BA postcode area. A forecourt, a supermarket car park, a lay-by or your own drive are all spots our technicians drain, and the car doesn't need to come to us.
In Southfield and still at the petrol pump?
Then you are in the best place there is. Switched off it stays; then ring.