Gala Park: Petrol in a Diesel Car? How Worried to Be
Far less than you likely are, if it hasn't been started. Until your ignition primes the pump, the starter cranks, or the car is driven, petrol in a diesel tank just sits there and does no harm. Which makes the honest reply to the first Gala Park query — "have I ruined it?" — usually no. Petrol in Diesel is who to call, with the engine left off, so it stays that way. Below, this page sets out what petrol actually does inside a diesel, how far it might have got, and how to stop it happening to you again.
Inside your engine: what petrol in a diesel does
Two tasks fall to diesel on its route through a motor. It lubricates first, and after that does it burn. What stops the surfaces inside your high-pressure pump and the injectors from wearing against each other is your diesel passing through them — they're made to extremely fine clearances.
Badly 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 precisely the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips out the protection your system hinges on, and any pump working on such a blend is wearing itself.
The shape of the trouble is plain when you put those together. Contact does not do the harm — circulation does. Where that petrol is only in your tank, it's a fault of fuel, nothing more. Whatever a worn pump sheds travels on, carried by your fuel, into the injectors further along, which is why a pump that has been working on that petrol is where a mechanical problem begins.
Gala Park, petrol in a diesel: four situations, from mild to serious
The best case there is: filled up, not once started. Being on a forecourt is what makes this the case: elsewhere, your car has been driven there to begin with. With the petrol held in your tank alone, it is cleared and rinsed on the spot, and nothing more is needed.
Ignition on, or started for a moment. Once primed, the system has pulled petrol from your tank as far as the fuel filter and your lines. Still generally simple: drain, flush, and your filter seen to.
Those few miles driven meant the pump labouring on fuel diluted by petrol the whole way. The work is that tank, your lines, the filter and fresh fuel through the whole circuit, and how hard the vehicle was driven matters as much as how far. Short trips, such as the school run to the local primary school, are one matter. Driving as far as Edinburgh, under 50 miles away, makes a very different job — as does any distance on the M8, under 50 miles from Gala Park, with the engine labouring hard all the way.
Driven until it protested. Rattling, a lumpy idle, smoke, a throttle that has gone soft. The motor is telling you your fuel is no longer behaving like diesel. Whether it's the verge on Livingstone Place, a lay-by or a side road, stop where you are then leave it. Permanent damage is very uncommon if a car is pulled over early, and the drain and flush that still come first take care of it.
What Gala Park motorists get told about petrol in a diesel — and the stories in it
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Topping up removes nothing; it gives you a bigger tank of the same mix. That advice supposes a diesel fuel system handles petrol by percentage. It doesn't.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. At higher pressure, through finer components: that is how a current diesel moves its fuel, and so the protection counts more, not less.
One myth that catches drivers off guard: if it starts and drives, it must be unharmed. Diesel in a petrol motor normally leaves a motor that won't run: the driver stops, and so does the harm. Feed petrol to a diesel and it normally fires up, idles and pulls away as if nothing happened — all the while its pump is wearing. Running is not the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a different fault. None of what petrol weakened is put back by it — and later, your tank still contains the petrol.
Myth: "Drain your tank yourself and you're sorted." Once the engine has been run, some of the petrol is no longer inside that tank: it's in the fuel filter and the lines, and it goes straight back through the pump on your next start. And, a can of petrol filled at the roadside is genuinely risky.
How petrol ends up: petrol in a diesel
Nobody does it on purpose, and it is rarely carelessness. One way only, since of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one generally will not fit a petrol motor. That's how the forecourt makes it easy.
When habit and the vehicle stop matching, it happens. Courtesy car, hire car, or a motor that is brand new. Households running one of each, petrol and diesel. Your usual forecourt, its pumps suddenly in a different order. Racing for a train at Galashiels and filling up en route. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that is when. The hand does what it has always done once you add rain, a phone call or a back seat full of kids.
Gala Park people: how to prevent petrol in a diesel next time
- Green for unleaded and black for diesel is usual in the UK — yet not on each forecourt. Go by the label on the petrol pump, not the colour.
- The first fill in an unfamiliar motor is the time to check the filler flap — inside it, or on the cap, plenty of vehicles state the fuel they take.
- One of each in the home? Mark your key to your diesel — a coloured fob, a sticker — because meaning to remember is not enough.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the pump. It sounds daft and it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, and so put your phone away and keep your mind on the pump.
- Some diesels come with a filler built to block a petrol nozzle, and devices you can add exist for motors without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading 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 fire it up.
Already put petrol in a diesel around Gala Park?
Then the order of things is short. Don't turn your ignition on, and do not fire it up. Still on the forecourt, at Asda or anywhere else? Ask the attendants to help you push the vehicle away from the petrol pump. Then call 0333 366 0103 and tell us what got in, roughly how much, and if it's run.
If it was AdBlue and not petrol, say so. That's a different problem — corrosion and deposits instead of lost protection — and it has its own page for Gala Park.
Gala Park petrol in a diesel jobs: why one costs more than another
Four separate jobs sit behind the four situations above — which is why there's no fair single quote. The scenario itself does most of the work of moving your cost. Where your car is matters too, and whether our van can safely get to it, after the proportion of petrol to what your tank holds.
Three queries come first, before quoting, instead of after — what got in, how much, has it run — and this is the reason. Those replies are what change a range into one firm number.
About Gala Park
Gala Park is a suburban area situated on the riverside in the Scottish Borders, with a mix of flat housing and local amenities. Gala Park sits at an elevation of around 120 metres, near the town of Galashiels and within commuting distance of Edinburgh, which is approximately 27 miles away. Gala Park is part of the wider urban area along the River Tweed, with nearby places including Old Town and Balmoral. Gala Park has a population of around 4639 people, living in a predominantly flat-based residential community.
Across Scottish Borders and around Gala Park: fuel drain cover
Galashiels, Old Town and Balmoral are among the locations near Gala Park that the same teams work, answering petrol in diesel jobs across Gala Park's TD postcode area. No need to move the car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places where we work.
Still at the pump around Gala Park?
Then, you couldn't be in a better spot. Keep it off. Phone.