Petrol in a Diesel Car in Steel Bank: How Worried Should You Be?
Less than you probably are, if it hasn't been started. Petrol resting in a diesel tank does nothing to your engine until something pulls it through the fuel system — your ignition priming your pump, your starter, or driving on its own. So the honest answer to the first question anyone around Steel Bank asks, "have I ruined it?", is generally no. Petrol in Diesel is who to phone, with the engine kept off, so it remains that way. The remainder of this page sets out what petrol really does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you a second time.
What petrol in a diesel does to the engine
Passing through an engine, diesel is doing two things at once. Oiling comes before burning; it does both. Extremely fine clearances are built into your injectors and the high-pressure fuel pump, and only the diesel flowing through keeps their surfaces from grinding together.
Petrol does the first job poorly and the second not at all. The rattling 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 lubrication the fuel system rests on, and any pump working on that mix is wearing itself.
Combined, those make the shape of the problem clear. Not contact but circulation is what causes the harm. All a tank with petrol in it amounts to is a fuel fault. 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 the fuel injectors beyond it.
Steel Bank, petrol in a diesel: four cases, from mild to significant
Filled up, and never started: nothing beats it. That petrol is in your tank and only that tank, and the task is a drain and a flush where the car stands. This is the one scenario that can only truly take place on a forecourt, since anywhere else the vehicle has been driven to get there.
The ignition turned on, or a short start. Once primed, the fuel system has pulled petrol from the tank as far as the filter and the lines. Still normally straightforward: drain, flush, and the fuel filter sorted.
Driven a couple of miles. Now the pump has spent these miles running on diluted fuel. How hard the car was driven counts as much as how far, and this work takes in that tank, your lines, your filter and clean fuel through the whole circuit. On the school run to Westways Primary School, the miles is small. Getting as far as Sheffield, under 3 miles away, makes a very different job — as does any distance on the M1, under 5 miles from Steel Bank, with the motor running hard all the way.
Clattering, an uneven idle, smoke, a throttle gone soft: driven until it complained. That is the engine telling you its fuel no longer is behaving like diesel. Leave it wherever it stops: a lay-by, a quiet street, the verge on Springvale Road. What goes first is still the fuel drain and flush-through, and that sorts it out, with permanent damage very uncommon if a vehicle is stopped soon.
Steel Bank motorists and that petrol in a diesel myths they hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing is removed by topping up — you are left with a bigger tank, still the same mix. The assumption behind the advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
"Newer diesels can handle a little petrol" — a myth, and nearer the opposite. Smaller components and higher pressure are how a modern diesel runs its fuel, and that makes the protection count more, not less.
This is the one that catches people. Myth: "If it starts and drives, there's no harm done." Diesel in a petrol motor generally leaves a motor that won't run: the driver stops, and so does the damage. A diesel fed petrol generally starts, idles and drives away as if nothing has happened, while your pump grinds. Running doesn't mean fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a different fault. What petrol has thinned stays diluted, and that petrol stays inside the tank regardless.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol lies in your filter and lines, waiting to go right back through your pump on the next start. Clearing petrol into a can by the roadside is also truly hazardous.
Petrol in a diesel: how does it occur?
It is rarely carelessness, and no one does it on purpose. One way only, since of the nozzles: the smaller petrol one slips inside a diesel filler with almost no resistance, while the diesel one generally won't fit a petrol motor. That is how the forecourt makes it simple.
Routine and your car getting out of step is how it takes place. Hire cars, courtesy cars, and vehicles that are new to you. Two vehicles on one drive, one petrol, one diesel. The pumps in a different order on a well-known forecourt. Racing for a train at Sheffield and fuelling up en route. Precisely the moment it takes place: after years of driving petrol, someone fills a diesel Renault Megane for the first time. Add rain, a phone call or a back seat full of children, and your hand does what it has always done.
Preventing petrol in a diesel next time you fill up around Steel Bank
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most generally do. Check the pump's label; the colour is just a hint.
- In a motor you don't know, look inside the flap over your filler or at the cap before your first fill: many vehicles print the fuel there.
- Good intentions count for 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.
- It sounds silly and it does the trick: on your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, so tuck the phone away and keep your mind on the pump.
- Add-on devices exist for cars without one, and some diesels are built with a filler that will not accept a petrol nozzle. Useful — but a safety net only, never a reason to stop checking the label.
- The moment you notice, stop: less petrol in that tank makes a weaker blend. What to do next doesn't change, though — still don't crank it.
Petrol already in a diesel in Steel Bank? Start here
Then the order of things is brief. Do not switch the ignition on, and don't start it. Still at the forecourt, at JET or anywhere else? Ask the attendants to help you roll the vehicle away from the petrol pump. Next, 0333 366 0103. We will ask what was put in, about how much, and if it has been run.
If it was AdBlue instead of petrol, say so. That's a separate issue — corrosion and deposits instead of lost lubrication — and it has its own page for Steel Bank.
Steel Bank petrol in a diesel tasks: why one costs more than another
Four separate tasks lie behind the four scenarios above — which is why there's no honest single quote. Chiefly, the cost shifts with which situation you're in. Beyond that it's the ratio — how much petrol got in against how much the tank takes — and after that where the car is and whether our van can reach it safely.
Before any quote, not after, we ask three queries: the fuel that was put in, its quantity, and whether it has run. That's why. Their answers are what change a range into one firm number.
About Steel Bank itself
Steel Bank is a suburban area located on the outskirts of Sheffield in South Yorkshire, sitting at an elevation of 182 metres. Steel Bank forms part of the larger urban landscape of Sheffield, with nearby places including Howard Hill, Birkendale, and Crookesmoor. Steel Bank is characterized by its predominantly terraced housing stock, reflecting the area's historical development as a residential neighbourhood.
Fuel drain cover across South Yorkshire, Steel Bank included
The teams answering petrol in diesel call-outs around Steel Bank, in the S postcode area, equally work the locations near it, Howard Hill, Birkendale and Crookesmoor among them. You need not move your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots where we work.
At the petrol pump in Steel Bank, right now?
Then, you could not be in a better position. Keep it off. Ring.