Should You Worry? Petrol in a Diesel Car in Kings Norton
Less than you probably are, if it hasn't been started. Petrol sitting in a diesel tank does nothing to your motor till something pulls it through the system — your ignition priming your pump, your starter, or the drive on its own. So the fair answer to the first query anyone around Kings Norton asks, "have I wrecked it?", is generally no. Keep it like that: leave the motor off and call Petrol in Diesel. Keep reading for three things: the effect petrol has inside a diesel engine, the signs of how far it has spread, and ways to make sure you don't repeat it.
What petrol in a diesel does to the motor
Passing through an engine, diesel is doing two things at once. Oiling comes before burning; it does both. Very fine tolerances are built into the fuel injectors and the high-pressure fuel pump, and just your diesel running through stops those surfaces grinding together.
Badly at the first, not at all at the second: that's petrol. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, leaving a pump on that mixture to wear itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is why you hear the knocking.
The shape of the trouble is clear once you put those together. It's circulation that does the harm, not contact. Petrol in the tank is a fuel issue. The beginning of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds moves on with the fuel to the injectors beyond it.
Four scenarios our engineers see in Kings Norton: how serious is petrol in a diesel?
Fuelled, and not started: nothing beats it. On a forecourt, and really only there, the petrol is still confined to your tank — because anywhere else the car was driven to get to it. The task is draining and purging on the spot.
A brief spell of running, or merely your ignition on. The fuel system has been primed, so petrol has left your tank and got to the fuel filter and your lines. Normally nothing more than draining, rinsing and seeing to the filter, so still straightforward.
Your pump now worked a few miles on thinned fuel — that is what driving the car does. Distance is only half of it; how hard it was driven matters equally. Either way the work includes the tank, the lines, your filter and clean fuel through the entire system. Driving the children to Kings Norton Primary School is one sort of trip. Very different a second time: a run to Birmingham, under 10 miles away, or any distance on the M42, under 5 miles from Kings Norton, where the engine never stopped running hard.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone uneven. The motor is telling you the fuel is no longer behaving like diesel. Stop wherever you are — the verge on Masshouse Lane, a lay-by, a side street — and leave the car where it is. What goes first is still the fuel drain and flush, and that takes care of it, with long-term damage very uncommon when a vehicle is pulled over early.
Petrol in a diesel myths Kings Norton drivers hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing comes out when you top up — the tank just holds more of the same mixture. The idea behind that advice — that diesel fuel systems accept petrol by percentage — is wrong.
Not so: a newer diesel copes with a bit of petrol. If anything, the reverse. A newer diesel sends its fuel through more precise components at higher pressure, which makes the protection matter more, not less.
This is the one that catches drivers. Myth: "If it starts and drives, there is no harm done." The driver of a petrol motor fed diesel normally stops, since it will not run, and the damage stops with them. A diesel fed petrol usually starts, idles and drives away as if nothing has happened, while the pump grinds. Running doesn't mean fine.
An outdated workaround for a distinct problem is behind this one. Myth: "Add some two-stroke oil and drive it home." It does not put back what petrol has weakened, and the petrol is still in your tank later.
Once the engine has run, part of that petrol sits in the filter and the fuel lines, not the tank — and the next start sends it straight back through the pump. So the myth "drain that tank yourself and you're sorted" doesn't hold. On top of that, petrol emptied into a can by the road is truly hazardous.
Petrol in a diesel: how does it take place?
It is rarely carelessness, and no one does it on purpose. The petrol nozzle is the smaller of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol motor at all. The forecourt makes it easy, and the slip runs one way.
The moment habit stops matching the vehicle is the moment it takes place. Hire cars, courtesy cars, and cars that are new to you. One petrol and one diesel on the drive of the same household. The pumps in a different order on a well-known forecourt. A train to catch, and a hurried fill en route to the nearest station. The first fill-up in a diesel Renault Megane after years of driving petrol is precisely the moment it happens. Add rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
How to avoid petrol in a diesel on your next fill-up in Kings Norton
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Read the petrol pump's label; the colour is only a clue.
- Check your filler flap. Many motors state the fuel type inside the flap or on the cap. Look at it on the first fill in a vehicle you do not know.
- One of each in the household? Mark your key to your diesel — a coloured fob, a sticker — since meaning to remember is not enough.
- "Diesel", aloud, before you pick up the nozzle — each time a new or hired car needs its first tank. It seems daft. It does the trick.
- Mistakes like this are simple to make while your mind is on something else, so the phone goes away.
- Add-on devices are available for vehicles without one, and some diesels are built with a filler that will not accept a petrol nozzle. Useful — but a safety net at best, never a reason to stop checking the label.
- The moment you realise, stop: less petrol in that tank means a weaker mix. What to do next does not change, though — still don't crank it.
Kings Norton: already put petrol in a diesel?
Short and simple, then, is the order of things. Leave it unstarted, with the ignition off too. If you're still at the forecourt — BP or anywhere else — ask the staff to help you roll the car away from the petrol pump. Next, 0333 366 0103. We will ask what went in, roughly how much, and if it's been run.
If it was AdBlue rather than petrol, say so. That's a separate issue — corrosion and deposits instead of lost protection — and it has its own page for Kings Norton.
Why one petrol in a diesel job in Kings Norton costs more than another
The four scenarios above are four separate jobs, so no single price for this would be fair. The scenario itself does most of the work of moving the cost. The ratio matters next, meaning how much of that tank is petrol, followed by the location of the car and whether reaching it is safe for a van.
What got in, how much, and whether it's run — three questions our engineers ask before costing, not after, for precisely that reason. Those answers are what change a range into one firm number.
About Kings Norton, briefly
Kings Norton is a suburban area in the West Midlands, situated near the lakes and waterways of the Birmingham canal network. Kings Norton sits at an elevation of around 152 metres, approximately 5 miles south of Birmingham city centre. Kings Norton has a mix of housing types, but semi-detached homes are particularly prevalent in the area. Kings Norton is close to other local neighbourhoods, including Walkers Heath, Lifford, and Cotteridge.
Across West Midlands and around Kings Norton: fuel drain cover
Kings Norton waits in the B postcode area, and the vans that answer petrol in diesel call-outs there work the locations around it as well — Walkers Heath, Lifford and Cotteridge among them. You need not move your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations we drain.
Still at the petrol pump around Kings Norton?
In that case, you couldn't be in a better spot. Call, and keep it turned off.