South Wigston: Petrol in a Diesel Car? How Worried to Be
Far less than you probably are, provided it hasn't been started. "Have I ruined it?" is the first question everyone around South Wigston asks, and the truthful answer is generally no, since petrol left in a diesel tank hurts nothing till it is drawn through the system — by ignition priming, by the starter, or by driving. Leave your engine off and phone Petrol in Diesel — that keeps it that way. Below, you will find what petrol actually does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
The motor and petrol in a diesel: what happens
Diesel has two jobs on its way through a motor. It ignites, and before it combusts it lubricates. Extremely fine gaps are built into your injectors and the high-pressure fuel pump, and only your diesel flowing through stops their surfaces grinding together.
Poorly at the first, not at all at the second: that's petrol. It is runnier than diesel and takes away the protection your fuel system depends on, and so a pump running on a petrol mix is a pump wearing itself. And petrol is made to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That's where the clattering comes from.
Seen together, they make clear the shape the trouble takes. The harm is done by movement, not by contact. Petrol in a tank is a fuel issue. Whatever a worn pump sheds travels on, borne by your fuel, into your injectors downstream, which is why a pump that has worked on the petrol is where a mechanical fault starts.
How serious is petrol in a diesel? Four situations our technicians see in South Wigston
Fuelled, and not started: nothing beats it. The petrol is in the tank and just the 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 at a forecourt, since anywhere else the car has been driven to get there.
A brief spell of running, or merely your ignition on. Petrol has left that tank and reached your filter and the lines, because the system has been primed. That's normally still a straightforward task — a drain, a flush, and your filter seen to.
Those few miles driven meant the pump working on fuel weakened by petrol throughout. Tank, lines, filter, then clean fuel put through the entire circuit: that is this work, and the way the car was driven counts as much as the mileage. Driving the children to Parkland Primary School South Wigston is one sort of trip. Driving as far as Leicester, under 5 miles away, makes a very different task — as does any mileage on the M1, under 3 miles from South Wigston, with the motor running hard all the way.
Driven until it protested. Knocking, an uneven idle, smoke, a throttle that has gone soft. The engine is telling you the fuel is no longer behaving like diesel. Leave it where it has stopped: a lay-by, a quiet street, the verge on Healey Street. A vehicle pulled over early very rarely has permanent damage, because the drain and the flush-through, which still come first, take care of it.
Myths South Wigston motorists hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." A fuller tank of the same mixture is all you get, because topping up removes nothing. That guidance presumes a diesel fuel system tolerates petrol by percentage. It does not.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. A current diesel sends its fuel through finer components at higher pressure, which makes the lubrication count more, not less.
One myth that catches people off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it generally will not run, and so the driver stops — and the damage stops with them. A diesel fed petrol usually starts, idles and drives away as if nothing has happened, while the pump wears. Fine and running are not the same at all.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an old fix for a distinct fault. None of what petrol thinned gets put back by it — and later, that tank still contains the petrol.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol lies in the fuel filter and lines, ready to go straight back through the pump at the next start. And, a can of petrol filled at the roadside is genuinely risky.
How does petrol in a diesel occur?
Nobody does it on purpose, and it's rarely carelessness. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol car at all. The forecourt makes it simple, and the slip runs one way.
It takes place when routine and the car stop matching. Hire cars, courtesy cars, and motors that are new to you. A household with one petrol and one diesel on the driveway. A forecourt you know, only with its pumps laid out differently. Racing for a train outside the nearest station and fuelling up en route. Exactly the moment it happens: after years of driving petrol, someone fills a diesel Renault Megane for the first time. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of kids.
South Wigston drivers: how to avoid petrol in a diesel next time
- 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 just a clue.
- Many motors state the fuel inside your filler flap or on the cap, and so check it on the first fill in any motor you do not know.
- Label the key. In a home with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember.
- Say it before you lift it. On the 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.
- Whilst you are thinking about something else, this is an easy mistake to make — so put your phone away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to refuse a petrol nozzle, and add-on devices exist for vehicles without one. They are a safety net, not a reason to stop checking the pump.
- The moment you realise, stop: less petrol in the tank means a weaker mix. What to do next does not change, though — still don't crank it.
South Wigston: already put petrol in a diesel?
Short and simple, then, is the order of things. Leave it unstarted, with the ignition off too. Yet on the forecourt, at BP or anywhere else? Ask the attendants to help you push the car away from the pump. Ring 0333 366 0103 next, with three facts — your fuel, the rough volume, and whether it has run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate fault — South Wigston has a page just for it.
One petrol in a diesel task in South Wigston costs more than another. Why?
Four separate tasks lie behind the four scenarios above — which is why there is no honest single price. The situation itself does most of the work of moving your cost. Where your car is counts too, and whether our van can safely get to it, after the ratio of petrol to what that tank holds.
Three queries come first, before any quote, rather than after — what was put in, how much, has it run — and this is the reason. Given those answers, you get a straight figure instead of a range.
About South Wigston itself
South Wigston is a suburban area in Leicestershire, situated near the River Soar and close to the city of Leicester. South Wigston has a mix of terraced housing and other residential properties, with the area being approximately 80 metres above sea level. South Wigston is located near several other places, including Wigston, Eyres Monsell, and Blaby, and is about 3.9 miles from Leicester city centre. South Wigston has a population of around 5101 people.
Across Leicestershire and around South Wigston: fuel drain cover
Our vans answering petrol in diesel calls around South Wigston, in the LE postcode area, equally work the spots near it, Wigston, Eyres Monsell and Blaby among them. A forecourt, a supermarket car park, a lay-by or your own drive are all places our technicians work, and your car does not need to move to us.
In South Wigston and still at the petrol pump?
The best spot there is, then — that is where you are. Call, and leave it switched off.