Petrol in a Diesel Car in Netherton: How Worried Should You Be?
Likely less than you are now — as long as nobody has started it. Till the ignition primes your pump, your starter cranks, or the vehicle is driven, petrol in a diesel tank simply sits there and does no harm. Which makes the honest reply to the first Netherton query — "have I wrecked it?" — usually no. Keep it like that: leave the engine off and ring Petrol in Diesel. The remainder of this page covers what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you again.
Inside the motor: what petrol in a diesel really does
Diesel does two jobs on its way through an engine. Before it ignites, it protects — and then it burns. What keeps the surfaces inside the high-pressure fuel pump and your injectors from wearing down against one another is your diesel passing through them — they're made to extremely fine tolerances.
Of these two tasks, petrol manages the first badly and the second never. The rattling 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 your system hinges on, and any pump running on such a mix is wearing itself.
Taken together, they show the shape the issue has. Not contact but circulation is what causes the damage. Petrol in a tank is a fuel fault. Whatever a worn pump sheds travels on, carried by the fuel, into your injectors further along, which is why a pump that has been working on the petrol is where a mechanical issue begins.
How serious is petrol in a diesel? Four situations we see around Netherton
Filled but not once started — the best it gets. That petrol is in the tank and just that tank, and the task is a drain and a flush where the car stands. This is the one situation that can only really take place at a forecourt, since anywhere else your car has been driven to get there.
Started for a moment, or only your ignition on. Petrol has come out of that tank and got to the fuel filter and the fuel lines, since the system has been bled. That's usually still a straightforward job — a drain, a flush, and the fuel filter seen to.
Those few miles on the road meant the pump working on fuel thinned by petrol the whole way. Miles is only half of that; how hard it was driven matters just as much. Either way this work includes that tank, your lines, the fuel filter and clean fuel through the entire system. On the school run to Northfield Road Primary School, the mileage is small. Driving as far as Wolverhampton, under 10 miles away, makes a very different task — as does any miles on the M5, under 3 miles from Netherton, with your engine working hard the whole time.
Driven until it protested. Clattering, a lumpy idle, smoke, a throttle that has gone soft. The fuel isn't behaving like diesel any more, and your engine is saying so. Pull up wherever you are — the verge on Halesowen Road, a lay-by, a side street — then leave the car where it is. Permanent damage is very rare when a vehicle is stopped quickly, and the fuel drain and flush that still go first take care of it.
Netherton people and the petrol in a diesel myths they hear
False: topping up to full with diesel makes it fine. It doesn't. Topping up removes nothing; it gives you a bigger tank of the same mix. The assumption behind the advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through more precise components: that's how a newer diesel moves its fuel, so the protection counts for more, not less.
"It starts, it drives, and so there is no harm" — the myth that catches more drivers than any other. Any petrol engine fed diesel normally will not run, and so the driver stops and the harm stops with them. Feed petrol to a diesel and it normally starts, idles and pulls away like nothing has happened — all while its pump wears. Running isn't the same as fine.
Not so: a two-stroke additive lets you to drive home. It is an old fix, meant for another fault. What petrol has diluted remains weakened, and that petrol stays inside your tank regardless.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol sits in your filter and lines, waiting to go straight back through the pump on your next start. And, a can of petrol drained at the kerbside is genuinely dangerous.
How it happens: petrol in a diesel
Nobody does it on purpose, and it's seldom carelessness. A diesel nozzle mostly will not go into a petrol car, yet the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake straightforward, and only in one direction.
When habit and the car stop matching, it takes place. A new vehicle, a hire car or a courtesy car. Two vehicles on one drive, one petrol, one diesel. Your ordinary forecourt, its pumps now in a different order. Filling up in a rush en route to Cradley Heath, with a train to catch. Exactly the moment it happens: after years of driving petrol, someone fills a diesel Volkswagen Passat for the first time. The hand does what it has always done when you add rain, a phone call or a back seat full of children.
Netherton motorists: how to prevent petrol in a diesel next time
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most generally do. Read the pump's label; the colour is just a hint.
- Check the filler flap. Plenty of motors state the fuel type inside the flap or on the cap. Look at it on your first fill in a car you do not know.
- A coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember, for a household with one of each.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It seems silly and it works.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away and keep your mind on the pump.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject a petrol nozzle, and add-on devices are available for vehicles without one. They are a safety net, not a reason to stop checking the pump.
- Stop as soon as you realise. Less petrol in the tank means a weaker blend. It doesn't change what to do next, which is still not to crank it.
Put petrol in a diesel in Netherton already?
In that case, there is just a short order of things. Do not turn your ignition on, and don't fire it up. Ask the attendants to help you push it away from the petrol pump if you are still at the forecourt, whether that is BP or somewhere else. Next, 0333 366 0103. We will ask what was put in, roughly how much, and if it has been run.
Corrosion and deposits form the problem with AdBlue, whereas petrol brings lost lubrication. So if it was AdBlue, say so — and read its own Netherton page.
One petrol in a diesel task in Netherton costs more than another. Why?
The four scenarios above are four different tasks, so no single price for this would be honest. Which of them you are in is chiefly what shifts the cost. Where the vehicle is matters too, and whether our van can safely get to it, after the ratio of petrol to what the tank holds.
Three queries come first, before any quote, rather than after — what was put in, how much, has it run — and that is the reason. Given the answers, you get a straight figure instead of a range.
About Netherton, for a moment
Netherton is a suburban area in the West Midlands, situated near the River Dudley and close to the city of Wolverhampton. Netherton has a mix of semi-detached housing and is located near other local areas such as Primrose Hill and Baptist End. Netherton sits at an elevation of 154 metres, with the nearby Darby End and other surrounding suburbs forming part of the wider urban landscape. Netherton is approximately 107 miles northwest of London, and is part of the larger West Midlands conurbation.
Across West Midlands and around Netherton: fuel drain cover
Primrose Hill, Baptist End and Darby End are among the spots near Netherton that the same teams work, answering petrol in diesel calls across Netherton's DY postcode area. The vehicle does not need to move to us: our engineers drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
In Netherton and still at the pump?
Then you're in the best place there can be. Ring, and keep it turned off.