Should You Worry? Petrol in a Diesel Car in South Norwood
If it has not been started, worry less than you probably are. "Have I wrecked it?" is the first thing everyone in South Norwood asks, and the truthful answer is generally no, because petrol left in a diesel tank harms nothing till it is dragged through the system — by ignition priming, by the starter, or by driving. Keep it that way: leave your motor off and call Petrol in Diesel. What petrol actually does to a diesel, how to judge how far it has travelled, and how to stop it from happening again: that is the remainder of this page.
The motor and petrol in a diesel: what happens
Two jobs fall to diesel on its route through a motor. It lubricates to begin with, and only then does it burn. Built to extremely fine gaps, the injectors and the pump depend on your diesel flowing through them to stop their surfaces wearing against one another.
Of these two tasks, petrol manages the first poorly and the second never. The knocking comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips out the lubrication your system depends on, and any pump running on that mixture is wearing itself.
The shape of the trouble is clear once you put those together. Contact doesn't do the damage — movement does. Where the petrol is only in your tank, it's a fault of fuel, nothing more. The start of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds travels on with your fuel to your injectors downstream.
Petrol in a diesel around South Norwood: how bad is it? Four situations
Filled but not once started — as good as it gets. At a forecourt, and truly only there, the petrol is still confined to that tank — since everywhere else the vehicle was driven to get to it. The task is emptying and cleaning on the spot.
The ignition switched on, or a brief start. Your system has been bled, and so petrol has left your tank and got to the filter and the lines. Drain, flush, deal with the filter: still normally easy.
Your pump now spent a few miles on weakened fuel — that's what driving it does. How hard the car was driven matters as much as how far, and this work takes in that tank, the fuel lines, your filter and clean fuel through the entire system. On the school run to South Norwood Primary, the distance is small. A run as far as Westminster, under 10 miles away, is a very different job. So is any distance on the M23, under 10 miles from South Norwood, where the engine has been working hard throughout.
Driven till it complained. Knocking, a lumpy idle, smoke, a throttle that has gone soft. What you are hearing is the motor signalling fuel that no longer acts like diesel. Leave it where it stops: a lay-by, a quiet street, the verge on Carmichael Road. A vehicle pulled over soon very rarely has lasting damage, as the fuel drain and the flush, which still go first, take care of it.
Stories South Norwood drivers hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Topping up removes nothing; it gives you a fuller tank of the same mix. A diesel fuel system does not accept petrol by percentage in the way that guidance presumes.
"Newer diesels can handle a little petrol" — a myth, and closer to the opposite. A modern diesel sends its fuel through more precise parts at higher pressure, which makes the protection count more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there's no harm done." Any petrol motor fed diesel normally will not run, so the driver stops and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile your pump grinds. Running is not the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a different fault. It does not put back what petrol has thinned, and that petrol is still inside that tank later.
If the engine has run, part of that petrol sits in the fuel filter and the lines, not your tank — and your next start sends it right back through your pump. So the myth "drain the tank yourself and you're sorted" does not hold. Clearing petrol into a can by the kerbside is also truly hazardous.
How does petrol in a diesel occur?
It's seldom carelessness, and no one does it on purpose. The petrol nozzle is the smaller of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol motor at all. The forecourt makes it simple, and the error runs one way.
It takes place when habit and your car stop matching. Hire cars, courtesy cars, and motors that are new to you. Two vehicles on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A train to catch, and a rushed fill en route to Norwood Junction. The first fill-up in a diesel Renault Clio after years of driving petrol is exactly the moment it takes place. The hand does what it has always done once you add rain, a phone call or a back seat full of children.
South Norwood people: how to prevent petrol in a diesel next time
- Read the pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on each forecourt. The label is what counts.
- Many cars state the fuel type inside the filler flap or on the cap, so check it on your first fill in any car you don't know.
- One of each in the household? Label your key to your diesel — a coloured fob, a sticker — because meaning to remember isn't enough.
- It seems silly and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the pump.
- Whilst you are thinking about something else, this is an easy mistake to make — so tuck your phone away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler built to reject a petrol nozzle, and add-on devices are available for motors without one. They are a safety net, not a reason to stop checking the pump.
- Stop as soon as you notice. Less petrol inside your tank makes a weaker mixture. It doesn't change what to do next, which is still not to fire it up.
South Norwood: already put petrol in a diesel?
The order of things is short, then. Starting it is out, and so is switching on your ignition. If you're still at the forecourt — Shell or anywhere else — ask the attendants to help you roll it clear of the pump. Then ring 0333 366 0103 and tell us what got in, about how much, and if it's run.
Say so if it was AdBlue rather than petrol: it's a separate problem, with its own page for South Norwood, since AdBlue brings corrosion and deposits rather than lost protection.
Why one petrol in a diesel job around South Norwood costs more than another
Four separate jobs lie behind the four scenarios above — which is why there is no honest single quote. Mostly, the cost shifts with which situation you are in. Two things follow that: the petrol that was put in as a share of what that tank takes, then the place the car is in and whether a van can reach it safely.
Three questions come first, before quoting, instead of after — what was put in, how much, has it run — and that is the reason. The answers change a range into a straight figure.
About South Norwood and where it is
South Norwood is a suburban area in south London, situated approximately 8 miles from central London and 7.5 miles from Westminster. South Norwood has a relatively low elevation of 51 metres and is characterised by a high proportion of flat dwellings. South Norwood is bordered by nearby places such as Woodside, Selhurst, and Elmers End, and has a population of around 16,194 residents. South Norwood forms part of the larger London urban landscape, with a mix of residential and commercial areas.
Across Greater London and in South Norwood: fuel drain cover
South Norwood rests in the SE postcode area, and our vans that answer petrol in diesel jobs there work the spots around it as well — Woodside, Selhurst and Elmers End among them. You need not move your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations where we work.
South Norwood: still at the pump?
Then you are in the best place there is. Phone, and leave it turned off.