Darby End: Petrol in a Diesel Car? How Worried to Be
Unstarted? Then less anxious than you likely feel. Petrol resting in a diesel tank does nothing to your engine till something draws it through the system — the ignition priming your pump, your starter, or the drive itself. So the honest answer to the first question everyone in Darby End asks, "have I ruined it?", is usually no. To leave the car like that, phone Petrol in Diesel then leave your motor alone. Read on for three things: the effect petrol has inside a diesel motor, the clues of how far it has spread, and ways to make sure you never repeat it.
What petrol in a diesel does to the engine
Diesel has two jobs on its way through a motor. Lubricating comes before burning; it does both. Extremely fine clearances are built into your injectors and the high-pressure pump, and just your diesel running through keeps those surfaces from grinding together.
Petrol handles the first job badly and the second not at all. A pump working on a petrol blend is wearing itself out, since petrol is thinner than diesel and strips out the lubrication the fuel system relies on. Petrol is also made to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that's where any knocking starts.
The shape of the issue is plain when you put those together. Not contact but movement is what does the damage. Where that petrol is only in your tank, it is a fault of fuel, nothing more. Whatever a worn pump sheds travels on, borne by the fuel, into the fuel injectors further along, which is why a pump that has been working on the petrol is where a mechanical issue begins.
Petrol in a diesel in Darby End: how serious is it? Four situations
Filled up, and not started: nothing beats it. Only your tank has petrol in it, and so the task is draining your tank and flushing the fuel system where the vehicle stands. This scenario can only really take place on a forecourt: anywhere else, your car got there by being driven.
The ignition turned on, or a short start. The fuel system has been bled, and so petrol has left the tank and reached your filter and your lines. Normally little more than draining, rinsing and seeing to the filter, so still straightforward.
A couple of miles driven, and your pump has spent every one of them labouring on weakened fuel. Tank, lines, filter, then clean fuel run through the entire system: that's this work, and the way your car was driven matters as much as the distance. On the school run to Netherbrook Primary School, the mileage is small. Driving as far as Birmingham, under 10 miles away, makes a very different job — as does any distance on the M5, under 3 miles from Darby End, with your engine working hard the whole time.
Driven until it complained. Rattling, a lumpy idle, smoke, a throttle that has gone soft. The motor is telling you your fuel is no longer behaving like diesel. Leave it where it stops: a lay-by, a side street, the verge on Bourne Hill Close. What comes first is still the drain and flush, and that deals with it, with permanent damage very uncommon if a car is pulled over soon.
Stories Darby End motorists hear about petrol in a diesel
False: topping up to full with diesel makes it fine. It doesn't. Nothing is removed by topping up — you are left with a fuller tank, still the same mixture. The idea behind the guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the reverse. At higher pressure, through finer components: that's how a newer diesel moves its fuel, so the protection counts more, not less.
One myth that catches motorists out: if it starts and drives, it must be unharmed. A petrol engine fed diesel usually will not run, and so the driver stops and the damage stops with them. Feed petrol to a diesel and it usually starts, ticks over and pulls away like nothing happened — all the while its pump is wearing. Fine and running aren't the same thing.
Myth: "Add some two-stroke oil and drive it home." It's an old fix for a different problem. The petrol is still inside that tank afterwards, and whatever it has weakened isn't put back.
Myth: "Drain the tank yourself and you are sorted." Once the motor has been run, some of that petrol is no longer inside the tank: it's in the filter and the fuel lines, and it goes straight back through your pump at the next start. On top of that, petrol emptied into a can by the road is truly dangerous.
How does petrol in a diesel take place?
Nobody does it on purpose, and it's seldom carelessness. A diesel nozzle mostly will not go into a petrol motor, yet the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error simple, and just in one direction.
When habit and the vehicle stop matching, it takes place. A new car, a hire car or a courtesy car. A household with one petrol and one diesel on the driveway. Your normal forecourt, its pumps suddenly in a different order. Racing for a train outside Old Hill and filling up en route. The first fill-up in a diesel Volkswagen Passat after years of driving petrol is precisely the moment it happens. With rain, a call coming in, or children to deal with, your hand simply does what it has always done.
Darby End people: how to prevent petrol in a diesel next time
- The label is what counts, and so check the pump rather than the colour: in the UK unleaded handles are normally green and diesel black, but not on every forecourt.
- Check your filler flap. Many cars state the fuel inside the flap or on the cap. Look at it on your first fill in any car you do not know.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, in a house with one of each.
- Before the nozzle leaves the petrol pump the first time you fuel a hired or new car, say "diesel" out loud. Silly, perhaps, yet it does the trick.
- Put the phone away. This is an easy mistake to make while you're thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to refuse a petrol nozzle, and add-on devices are available for the rest. Treat it as a backstop, and keep reading the pump.
- Stop as soon as you realise. Less petrol in the tank means a thinner blend. It does not change what to do next, which is still not to fire it up.
Darby End: already put petrol in a diesel?
Then the order of things is short. 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 push the car clear of the petrol pump. Then phone 0333 366 0103 and tell us what was put in, roughly how much, and whether it's run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a different problem — Darby End has a page just for it.
Why one petrol in a diesel task in Darby End costs more than another
A fair single price does not exist here: four scenarios, four separate jobs. Mostly, the cost moves with which one you're in. Two things come after that: the petrol that got in as a proportion of what your tank takes, then the place the vehicle is in and whether a technician can get to it safely.
Three questions come first, before quoting, instead of after — what went in, how much, has it run — and this is the reason. With the replies, there is a straight figure instead of a range.
About Darby End
Darby End is a suburban area in the West Midlands, situated near the River Rea and close to the city of Birmingham. Darby End has a mix of semi-detached housing and local amenities, with nearby places including Windmill End and Primrose Hill. Darby End is located at an elevation of around 130 metres, and is approximately 7 miles from Birmingham city centre. Darby End is also within commuting distance of London, which is around 107 miles to the southeast.
Across West Midlands and in Darby End: fuel drain cover
Our vans answering petrol in diesel calls around Darby End, in the DY postcode area, equally work the spots near it, Windmill End, Primrose Hill and Brickhouse Farm included. 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 in Darby End?
No position is better: that's where you are. Keep the vehicle switched off, then ring.