Evesham: Petrol in a Diesel Car? How Worried to Be
If it hasn't been started, worry far less than you probably are. Petrol sitting in a diesel tank does nothing to your engine until something pulls it through the fuel system — the ignition priming your pump, the starter, or driving itself. So the honest answer to the first question everyone around Evesham asks, "have I wrecked it?", is usually no. To keep the car that way, ring Petrol in Diesel then leave the engine switched off. Read on for three things: the effect petrol has inside a diesel motor, the clues of how far it has spread, and the way to make sure you never repeat it.
Inside the motor: what petrol in a diesel does
Passing through an engine, diesel does two things at the same time. Lubricating comes before burning; it does both. Very fine tolerances go into the fuel injectors and your high-pressure pump, and only your diesel running through keeps their surfaces from grinding together.
The second task petrol doesn't do at all, and the first it does badly. Being less viscous than diesel, petrol strips away the protection a fuel system needs, so a pump running on the mixture to wear itself. It is equally made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the knocking.
Together, those make the shape of the trouble clear. Contact does not do the damage — movement does. A tank with petrol in it is a fuel problem. After the pump has been working on that petrol, a mechanical fault has begun: whatever is shed by a pump that is grinding is carried downstream to your injectors with the fuel.
How bad is petrol in a diesel? Four scenarios we see in Evesham
The best case there can be: filled up, never started. Just the tank has petrol in it, and so the task is emptying the tank and flushing the system where the car sits. This scenario can only really occur at a forecourt: anywhere else, the vehicle got there by being driven.
Ignition on, or started for a moment. Once primed, the fuel system has pulled petrol from the tank as far as the filter and the lines. Still generally straightforward: drain, flush, and the fuel filter sorted.
Driven a few miles. Now your pump has spent those miles working on diluted fuel. Miles is only half of it; how hard it was driven counts equally. Either way this work runs to that tank, your lines, your filter and clean fuel through the entire circuit. On the school run to Swan Lane First School, the distance is small. Very different a second time: a run to Worcester, under 15 miles away, or any miles on the Strensham Interchange, under 10 miles from Evesham, where your engine never stopped working hard.
It protested, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone lumpy. The engine is telling you your fuel is no longer behaving like diesel. Leave it where it has stopped: a lay-by, a quiet street, the verge on Vine Street. Permanent damage is very uncommon if a vehicle is stopped early, and the fuel drain and flush-through that still come first sort it out.
Petrol in a diesel myths Evesham drivers hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing comes out when you top up — your tank simply holds more of the same mixture. A diesel fuel system doesn't accept petrol by percentage in the way that guidance supposes.
Not so: a newer diesel copes with a bit of petrol. Rather, the opposite. Finer components and higher pressure are the way a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
"It starts, it drives, and so no harm done" — the myth that catches most drivers than any other. Diesel in a petrol motor normally means a motor that will not run: the motorist stops, and so does the damage. While the pump wears, a diesel fed petrol usually starts, ticks over and drives away as if nothing has happened. Being able to run isn't the same as being fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a distinct issue. What petrol has thinned remains diluted, and the petrol remains inside your tank regardless.
"Drain it yourself and you are sorted" — a myth, because after it's been running some petrol lies in the fuel filter and lines, ready to go right back through the pump on your next start. And, a can of petrol filled at the roadside is truly risky.
How it happens: petrol in a diesel
Carelessness is seldom the cause, and no one means to do it. A diesel nozzle generally will not fit a petrol car, yet the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake straightforward, and only in that direction.
It takes place when habit and your car stop matching. Any motor that's new to you — a hire car, on loan as a courtesy car, or just bought. One petrol and one diesel on the driveway of the same household. A well-known forecourt with the pumps in a different order. Rushing for a train outside the nearest station and filling up en route. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist used to petrol: exactly when it happens. The hand does what it has always done when you add rain, a phone call or a back seat full of kids.
Evesham people: how to avoid petrol in a diesel next time
- A green handle for unleaded and black for diesel is usual in the UK — yet not on every forecourt. Go by the label on the petrol pump, not the colour.
- Check your filler flap. Many motors state the fuel inside the flap or on the cap. Look at it on the first fill in a car you do not know.
- Good intentions do less than a sticker or a fob in a bright colour on your diesel's key when a home has one of each. So mark it.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump. It seems silly and it works.
- Mistakes like this are straightforward to make whilst your mind is on something else, and so your phone goes away.
- Some diesels come with a filler designed to reject a petrol nozzle, and devices you can add exist for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the pump.
- The moment you realise, stop: less petrol in that tank makes a thinner mix. What to do next doesn't change, though — still do not crank it.
Already put petrol in a diesel in Evesham?
Then, there's only a short order of things. Starting it is out, and so is switching on the ignition. If you are still on the forecourt — the nearest petrol station or anywhere else — ask the attendants to help you roll the car away from the pump. Ring 0333 366 0103 next, with three facts — your fuel, the approximate quantity, and if it has run.
If it was AdBlue rather than petrol, say so. That's a separate issue — corrosion and deposits instead of lost lubrication — and it has its own page for Evesham.
One petrol in a diesel task around Evesham costs more than another. Why?
There's no fair single quote for this, because the four scenarios above are four different tasks. The situation itself does most of the work of moving your cost. The share counts next, meaning how much of your tank is petrol, and then the position of the car and whether reaching it is safe for a van.
That is why our engineers ask three questions before costing rather than after: what was put in, how much, and if it has run. Those answers change a range into a straight figure.
About Evesham and its setting
Evesham is a riverside town in Worcestershire, situated on the banks of the River Avon at an elevation of around 38 metres. Evesham lies approximately 13.5 miles southeast of Worcester and 87.6 miles northwest of London, with nearby neighbourhoods including Greenhill, Bengeworth, and Hampton. Evesham has a population of around 20,234 people, predominantly living in semi-detached housing. Evesham remains a significant urban centre in the West Midlands region.
Fuel drain cover in Evesham and across Worcestershire
Petrol in diesel jobs in Evesham — part of the WR postcode area — go to vans that also cover the locations about it, Greenhill, Bengeworth and Hampton included. The vehicle does not need to move to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the pump around Evesham?
Then you are in the best position there is. Keep it off. Call.