Should You Worry? Petrol in a Diesel Car in Westoe
Not started? Then less worried than you probably are. Until your ignition primes the pump, your starter cranks, or the vehicle is driven, petrol in a diesel tank simply waits there and does nothing. Which means the honest reply to the first Westoe question — "have I ruined it?" — normally no. To leave the vehicle that way, ring Petrol in Diesel and leave the motor switched off. What petrol really does to a diesel, how to judge how far it has gone, and how to keep it from happening a second time: that is the rest of this page.
What petrol in a diesel does to the engine
Diesel does two tasks on its way through an engine. Before it combusts, it lubricates — then it combusts. The high-pressure fuel pump and the fuel injectors are made to extremely fine clearances, and the diesel passing through them is what keeps those surfaces from wearing down against each other.
Badly at the first, not at all at the second: that's petrol. A pump working on a petrol blend is wearing itself out, because petrol is runnier than diesel and takes away the protection the fuel system depends on. Petrol is also made to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that's where the clattering starts.
Put these together and the shape of the trouble is clear. Contact doesn't do the harm — circulation does. Where that petrol is only in your tank, it's a fault of fuel, nothing more. The beginning of a mechanical problem is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with your fuel to your injectors beyond it.
Petrol in a diesel in Westoe: how serious is it? Four cases
The best case there can be: filled up, never started. Just the tank has petrol in it, and so the job is emptying your tank and rinsing the system where the vehicle sits. This scenario can only really occur at a forecourt: anywhere else, the car got there by being driven.
Ignition on, or started for a second. The system has been primed, so petrol has left your tank and reached the fuel filter and your lines. Usually nothing more than emptying, flushing and seeing to the fuel filter, and so still simple.
Your pump has spent a couple of miles on weakened fuel — that is what driving it does. Mileage is only half of it; how hard it was driven counts equally. Either way this work runs to the tank, the lines, the filter and fresh fuel through the whole system. The school run to Westoe Crown Primary School is one matter. Any miles on the A194(M), under 5 miles from Westoe, means your engine working hard throughout, and a run to Sunderland, under 10 miles away, is a very different task too.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone uneven. The fuel is not acting like diesel any more, and your engine is saying so. Stop wherever you are — the verge on Saint Michael's Avenue, a lay-by, a side street — and leave it where it is. The fuel drain and flush still come first, and they sort it out: when a car is stopped soon, long-term damage is very uncommon.
Stories Westoe people 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." Nothing is removed by topping up — you are left with a bigger tank, still the same mixture. A diesel fuel system does not accept petrol by percentage in the way that guidance supposes.
If anything, the reverse is true. Myth: "A newer diesel can cope with a bit of petrol." Lubrication matters more on current diesels, not less, because their fuel passes through finer components at higher pressure.
Myth: "If it starts and drives, there is no damage done." This is the one that catches drivers. Feed diesel to a petrol motor and it generally will not run, so the motorist stops — and the harm stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile your pump wears. Fine and running aren't the same at all.
Myth: "Add some two-stroke oil and drive it home." It is an old workaround for a different fault. That petrol is still inside that tank afterwards, and whatever it has diluted isn't put back.
If your engine has run, part of the petrol is in the filter and your lines, not that tank — and the next start pulls it straight back through your pump. So the myth "drain the tank yourself and you're sorted" doesn't stand up. And, a can of petrol drained by the kerbside is truly dangerous.
How it happens: petrol in a diesel
A careless moment is seldom the cause, and nobody means to do it. The petrol nozzle is the smaller of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol vehicle at all. The forecourt makes it simple, and the slip runs one way.
Routine and the vehicle falling out of step is how it takes place. Any motor that is new to you — a hire car, on loan as a courtesy car, or brand new. Households running one of each, petrol and diesel. A forecourt you know, only with its pumps arranged differently. Fuelling up in a rush on the way to Brockley Whins, with a train to catch. A new-to-you diesel Volkswagen Passat, its first fuelling, and a motorist accustomed to petrol: precisely when it happens. Add a back seat full of kids, a phone call or rain, and habit takes over.
Next time you fill up in Westoe: preventing petrol in a diesel
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Read the pump's label; the colour is only a hint.
- In a vehicle you do not know, look inside the flap over the filler or at the cap before the first fill: many vehicles print the fuel type there.
- One of each in the household? Label your key to the diesel — a bright fob, a sticker — because intending to remember isn't enough.
- Before the nozzle leaves the petrol pump the first time you fill a hired or new car, say "diesel" aloud. Daft, yes, but it works.
- Thinking about something else is when this becomes an easy mistake to make, 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 built to refuse a petrol nozzle, and add-on devices are available for motors without one. They are a backstop, not a reason to stop checking the pump.
- Less petrol makes a thinner mix, so stop as soon as you realise — while remembering that the next stage is unchanged. It's still not to fire it up.
Westoe: already put petrol in a diesel?
The order of things is short, then. Leave it unstarted, with the ignition switched off too. If you are still at the forecourt — Esso or anywhere else — ask the attendants to help you push the car clear of the petrol pump. Next, 0333 366 0103. We will ask what got in, roughly how much, and if it's been run.
If it was AdBlue rather than petrol, say so. That's a separate fault — corrosion and deposits rather than lost protection — and it has its own page for Westoe.
What makes one Westoe petrol in a diesel task cost more than the next
A fair single price doesn't exist here: four situations, four separate tasks. The scenario itself does most of the work of moving the cost. The share counts next, meaning how much of that tank is petrol, and then the position of the car and whether getting to it is safe for a van.
What got in, how much, and if it has run — three queries we ask before quoting, not after, for precisely that reason. A range turns into a straight figure once the replies are in.
About Westoe and its setting
Westoe is a suburban area located on the coast of Tyne and Wear, with a relatively low elevation of 38 metres above sea level. Westoe sits near the cities of Sunderland and South Shields, with nearby places including Cauldwell, High Shields, and Harton. Westoe is predominantly composed of flat housing, which is typical of many coastal urban areas in the North East of England. Westoe is situated approximately 246 miles north of London, making it a relatively distant suburb from the capital city.
Westoe and Tyne and Wear: where our fuel drain cover reaches
Cauldwell, High Shields and Harton are among the places near Westoe that the same vans work, answering petrol in diesel jobs across Westoe's NE postcode area. Our engineers drain where the vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
In Westoe and still at the petrol pump?
The best position there is, then — that's where you are. Keep it off. Ring.