Middle Winterslow: Petrol in a Diesel Car? How Worried to Be
If it has not been started, worry less than you probably are. Petrol resting in a diesel tank does nothing to your engine until something draws it through your fuel system — your ignition priming your pump, the starter, or the drive on its own. So the truthful answer to the first question everyone in Middle Winterslow asks, "have I wrecked it?", is generally no. Petrol in Diesel is who to ring, with your engine kept off, and so it remains that way. What petrol actually does to a diesel, how to gauge how far it's gone, and how to keep it from happening again: that is the remainder of this page.
What petrol in a diesel does to the engine
Passing through a motor, diesel does two jobs at the same time. Before it ignites, it protects — and then it ignites. Very fine gaps are built into the fuel injectors and the high-pressure fuel pump, and only the diesel flowing through keeps their surfaces from grinding together.
Poorly at the first, not at all at the second: that's petrol. The clattering comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips away the protection the fuel system depends on, and any pump working on that blend is wearing itself.
Put those together and the shape of the problem is clear. Not contact but circulation is what causes the damage. All a tank with petrol in it amounts to is a fuel problem. Whatever a worn pump sheds travels on, borne by your fuel, into the fuel injectors downstream, which is why a pump that has been working on the petrol is where a mechanical fault begins.
Middle Winterslow, petrol in a diesel: four situations, from mild to significant
The best case there can be: filled up, not once started. At a forecourt, and genuinely only there, that petrol is still confined to your tank — since everywhere else your car was driven to get to it. The job is draining and cleaning on the spot.
Started for a moment, or only your ignition on. Your system has been primed, so petrol has left your tank and reached your filter and the fuel lines. Still normally simple: drain, flush, and the fuel filter dealt with.
Those few miles on the road meant your pump running on fuel diluted by petrol the whole way. Miles is only half of that; how hard it was driven matters equally. Either way this work includes your tank, your lines, the filter and clean fuel through the entire system. Driving the kids to Winterslow Church of England Primary School is one sort of trip. Any miles on the M27, under 15 miles from Middle Winterslow, means your engine has worked hard throughout, and a run to Salisbury, under 10 miles away, makes a very different job as well.
Rattling, a lumpy idle, smoke, a throttle gone soft: driven till it complained. The motor is telling you your fuel is no longer acting like diesel. Stop where you are — on the verge on Yew Tree Close, at the kerb, down a side road — and don't move it. The fuel drain and flush-through still come first, and they take care of it: when a car is stopped soon, lasting damage is very unusual.
Petrol in a diesel stories Middle Winterslow drivers hear
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing is removed by topping up — you are left with a bigger tank, still the same mixture. Percentage isn't how a diesel fuel system copes with petrol, whatever that guidance supposes.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the reverse. More precise components and higher pressure are how a modern diesel runs its fuel, and that makes the lubrication count more, not less.
The myth that catches drivers out: if it starts and drives, it must be unharmed. Diesel in a petrol motor usually means a motor that won't run: the motorist stops, and so does the harm. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump wears. Running doesn't mean fine.
Myth: "Add some two-stroke oil and drive it home." It's an outdated fix for a separate problem. None of what petrol weakened is put back by it — and afterwards, the tank still holds the petrol.
Myth: "Drain that tank yourself and you are sorted." Once your engine has run, some of that petrol is no longer in that tank: it's in the filter and the lines, and it goes right back through the pump on the next start. On top of that, petrol cleared into a can by the road is genuinely risky.
How does petrol in a diesel occur?
On purpose? Never. Through carelessness? Seldom, if ever. A diesel nozzle mostly won't fit a petrol car, yet the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error easy, and only in one direction.
When habit and the vehicle stop matching, it happens. Any car that is new to you — hired, on loan as a courtesy car, or just bought. One petrol and one diesel on the drive of the same household. A familiar forecourt with the pumps in a different order. Racing for a train at Dean and fuelling up en route. A new-to-you diesel Volkswagen Passat, its first fuelling, and a motorist used to petrol: exactly when it occurs. Your hand repeats what it has always done once you add rain, a phone call or a back seat full of children.
How to avoid petrol in a diesel on your next fill-up in Middle Winterslow
- Read the pump, not the colour. In the UK unleaded handles are generally green and diesel black, but not on every forecourt. The label is what matters.
- In a car you don't know, look inside the flap over your filler or at the cap before your first fill: many cars state the fuel type there.
- Label your key. In a house with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember.
- Before the nozzle leaves the petrol pump the first time you fill a hired or new vehicle, say "diesel" aloud. Silly, yes, yet it works.
- Mistakes like this are straightforward to make while your mind is on something else, and so your phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to block a petrol nozzle, and add-on devices exist for vehicles without one. They are a safety net, not a reason to stop checking the pump.
- Stop the moment you realise. Less petrol inside your tank means a thinner blend. It does not change what to do next, which is still not to crank it.
Put petrol in a diesel around Middle Winterslow already?
Short and simple, then, is the order of things. Leave it unstarted, with the ignition switched off too. Ask the staff to help you roll it away from the pump if you are still on the forecourt, whether that's Pace or somewhere else. Ring 0333 366 0103 next, with three answers — your fuel, the approximate quantity, and whether it's run.
If it was AdBlue rather than petrol, say so. That's a separate fault — corrosion and deposits rather than lost lubrication — and it has its own page for Middle Winterslow.
Middle Winterslow petrol in a diesel jobs: why one costs more than another
An honest single quote does not exist here: four situations, four separate jobs. Mostly, the cost shifts with which one you are in. Two things come after that: the petrol that got in as a share of what your tank holds, then the spot the car is in and whether a technician can get to it safely.
Three questions come first, before any quote, rather than after — what went in, how much, has it run — and that is the reason. A range turns into a straight figure once the answers are in.
About Middle Winterslow
Middle Winterslow is a rural village in Wiltshire, situated near the city of Salisbury and surrounded by other small settlements like West Winterslow and East Winterslow. Middle Winterslow sits at an elevation of around 152 metres, with detached housing being the predominant type of accommodation. Middle Winterslow is located approximately 72 miles from London, making it a relatively accessible rural community. Middle Winterslow has a small population of around 730 residents, with nearby Firsdown also being a neighbouring locality.
Fuel drain cover across Wiltshire, Middle Winterslow included
The vans answering petrol in diesel calls around Middle Winterslow, in the SP postcode area, equally work the places around it, West Winterslow, East Winterslow and Firsdown included. No need to bring your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places we drain.
At the pump in Middle Winterslow, still?
Then, you couldn't be in a better position. Keep it turned off, then ring.