Martock: Petrol in a Diesel Car? How Worried to Be
Unstarted? Then less worried than you likely are. Everyone around Martock begins with "have I ruined it?", and the honest answer is normally no: petrol left inside that tank of any diesel stays harmless until priming, cranking or driving draws it into your fuel system. Keep it that way: leave your motor off then call Petrol in Diesel. What petrol actually does to a diesel, how to gauge how far it has gone, and how to stop it from happening again: that's the remainder of this page.
The motor and petrol in a diesel: what happens
Passing through a motor, diesel is doing two things at the same time. It lubricates first, and only then does it burn. Made to extremely fine clearances, your injectors and your pump rely on your diesel flowing through them to keep their surfaces from wearing against one another.
The second job 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 on the blend to wear itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is where you hear the rattling.
Seen together, they make clear what shape the trouble has. The damage is done by circulation, not by contact. Where that petrol is only inside that tank, it is an issue of fuel, nothing more. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the fuel injectors further on.
Martock, petrol in a diesel: four cases, from mild to major
Fuelled up, never started. The best case there is. Being at a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With that petrol kept inside the tank alone, it is drained and purged right where it stands, and nothing more is needed.
Started for a moment, or only the ignition on. Once primed, your system has pulled petrol out of the tank as far as your filter and your lines. That is usually still a simple job — a drain, a flush, and your filter dealt with.
A couple of miles driven, and your pump has spent each of them labouring on weakened fuel. Mileage is only half of that; how hard it was driven counts just as much. Either way this work runs to the tank, your lines, the fuel filter and fresh fuel through the entire circuit. On the school run to Martock Church School, the miles is short. Very different again: a trip to Wells, under 25 miles away, or some distance on the M5, under 15 miles from Martock, where the motor never stopped labouring hard.
Driven till it complained. Clattering, an uneven idle, smoke, a throttle that has gone soft. The motor is telling you your fuel is no longer behaving like diesel. Pull up on the spot — on the verge on East Street, at the kerb, down a side road — and do not move it. What goes first is still the drain and flush-through, and that sorts it out, with long-term damage very unusual when a car is stopped soon.
Petrol in a diesel stories Martock drivers hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing is removed by topping up — you're left with a bigger tank, still the same mix. A diesel fuel system doesn't tolerate petrol by percentage in the way that guidance supposes.
"Modern diesels can handle a little petrol" — a myth, and nearer the reverse. Finer components and higher pressure are how a current diesel runs its fuel, and that makes the lubrication count more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there's no damage done." Diesel in a petrol motor usually leaves a motor that won't run: the motorist stops, and so does the damage. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile the pump grinds. Running doesn't mean fine.
An old workaround for a separate issue lies behind this one. Myth: "Add some two-stroke oil and drive the car home." That petrol is still in that tank after that, and what it has thinned is not put back.
The next start sends petrol back round the pump out of the lines and the filter, where some of that sits after the engine has been run. That's why a DIY tank drain does not sort it — a myth. Also, a can of petrol filled at the roadside is truly risky.
How it happens: petrol in a diesel
It's seldom carelessness, and nobody does it on purpose. A diesel nozzle generally won't fit a petrol vehicle, yet the smaller petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake straightforward, and just in one direction.
It happens when habit and your car stop matching. Any car that's new to you — hired, on loan as a courtesy car, or just bought. A household with one petrol and one diesel on the driveway. A familiar forecourt with the pumps in a different order. A rushed fill en route to Crewkerne with a train to catch. A new-to-you diesel Nissan Qashqai, its first fuelling, and a motorist used to petrol: precisely when it occurs. Your hand does what it has always done when you add rain, a phone call or a back seat full of children.
Preventing petrol in a diesel next time you fill up around Martock
- The label is what matters, so check the pump instead of the colour: in the UK unleaded handles are usually green and diesel black, yet not on each forecourt.
- Plenty of cars state the fuel inside the filler flap or on the cap, so check it on the first fill in a car you do not know.
- One of each in the home? Label your key to your diesel — a coloured fob, a sticker — since intending to remember is not enough.
- Before the nozzle leaves the petrol pump the first time you fuel a hired or new car, say "diesel" out loud. Daft, yes, but it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck your phone away then keep your mind on the pump.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to refuse a petrol nozzle, and add-on devices are available for the rest. Treat it as a backstop, then keep reading the pump.
- Stop as soon as you realise. Less petrol in your tank means a weaker mixture. It doesn't change what to do next, which is still not to fire it up.
Martock: already put petrol in a diesel?
Short and simple, then, is the order of things. Don't crank it, and don't switch your ignition on. Still at the forecourt, at Texaco or anywhere else? Ask the attendants to help you roll the vehicle clear of the pump. What got in, about how much, and whether it's run: tell us those when you call 0333 366 0103.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate fault — Martock has a page just for it.
One petrol in a diesel job in Martock costs more than another. Why?
The four situations above are four separate tasks, so no single quote for this would be fair. Mostly, your cost moves with which one you are in. The share counts next, meaning how much of your tank is petrol, followed by the location of your car and whether reaching it is safe for our van.
That's why we ask three queries before pricing instead of after: what got in, how much, and if it has run. Those replies change a range into a straight figure.
About Martock
Martock is a village in Somerset, situated on the banks of the River Parrett at an elevation of around 22 metres. Martock lies near the villages of Hurst, Bower Hinton, and Coat, and is approximately 17 miles from the city of Wells. Martock has a population of around 1620 people, predominantly living in semi-detached housing. Martock is located in the South West region of England, about 120 miles west of London.
Martock and Somerset: where our fuel drain cover runs
Our vans answering petrol in diesel calls around Martock, in the TA postcode area, also work the spots around it, Hurst, Bower Hinton and Coat included. No need to bring your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places where we work.
In Martock and still at the petrol pump?
Then you are in the best spot there can be. Leave the car turned off, and ring.