Should You Worry? Petrol in a Diesel Car in Charlton
Far less than you likely are, provided it hasn't been started. "Have I ruined it?" is the first question anyone in Charlton asks, and the honest answer is generally no, since petrol resting in a diesel tank hurts nothing until it's dragged through your fuel system — by ignition priming, by the starter, or by being driven. Keep it that way: leave the engine off and phone Petrol in Diesel. The rest of this page covers what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you again.
The engine and petrol in a diesel: what goes on
On its way through an engine, diesel has two jobs. Before it ignites, it protects — then it combusts. Very fine tolerances are built into your injectors and the high-pressure pump, and just the diesel flowing through stops those surfaces grinding together.
Badly at the first, not at all at the second: that is petrol. A pump working on a petrol blend is wearing itself out, since petrol is runnier than diesel and takes away the protection the fuel system relies on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that's where the knocking starts.
Seen together, they show the shape the trouble has. The harm is done by circulation, not by contact. Any tank with petrol in it is a fuel fault. Whatever a worn pump sheds goes on, borne by your fuel, into the fuel injectors further along, which is why a pump that has been working on the petrol is where a mechanical problem begins.
Four situations we see around Charlton: how serious is petrol in a diesel?
Fuelled, and not started: nothing beats it. Only your tank has petrol in it, and so the task is clearing your tank and cleaning the system where the car stands. This situation can only really take place at a forecourt: anywhere else, the vehicle got there by being driven.
The ignition switched on, or a brief start. Once primed, your system has drawn petrol out of your tank as far as your filter and your lines. That is usually still an easy job — a drain, a flush, and your filter seen to.
A couple of miles driven, and your pump has spent every one of them working on diluted fuel. Tank, lines, filter, then fresh fuel put through the entire system: that's the work, and the way your car was driven counts as much as the miles. Driving the kids to St Paul's Church of England VC Junior School is one sort of trip. Driving as far as Wells, under 10 miles away, makes a very different task — as does any distance on the M5, under 25 miles from Charlton, with the engine working hard the whole time.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. What you are hearing is your engine signalling fuel that no longer acts like diesel. Whether it's the verge on Trajan's Way, a lay-by or a side street, stop there and leave it. Long-term damage is very rare if a car is pulled over soon, and the drain and flush that still come first sort it out.
Petrol in a diesel stories Charlton motorists hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up takes out 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.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. A newer diesel runs its fuel through smaller parts at higher pressure, which makes the lubrication matter more, not less.
"It starts, it drives, and so there is no harm" — the myth that trips up more drivers than any other. The driver of a petrol motor fed diesel normally stops, since it will not run, and the damage stops there. While the pump wears, a diesel fed petrol normally starts, ticks over and drives away as though nothing has happened. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive the car home." It is an outdated fix for a distinct issue. What petrol has weakened remains weakened, and that petrol remains in the tank regardless.
The next start sends petrol back round your pump from the lines and the filter, where some of it sits once your engine has run. That is why draining your tank yourself does not leave you sorted — a myth. On top of that, petrol cleared into a can by the road is genuinely dangerous.
Why petrol in a diesel takes place at all
Carelessness is seldom the cause, and nobody means to do it. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol car at all. The forecourt makes it simple, and the error runs one way.
Routine and your car falling out of step is when it happens. A new vehicle, a hire car or a courtesy car. One petrol and one diesel on the drive of the same household. Your usual forecourt, its pumps now in a different order. A train to catch, and a rushed fill en route to Castle Cary. Years of petrol vehicles behind you, a diesel Volkswagen Passat in front of you on the forecourt for its first tank — that is when. Throw in rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
Charlton drivers: how to avoid petrol in a diesel next time
- The label is what counts, and so read the petrol pump rather than the colour: in the UK unleaded handles are usually green and diesel black, but not on every forecourt.
- In a car you don't know, look inside the flap over your filler or at the cap before your first fill: many motors print the fuel type there.
- Mark the key. In a household with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember.
- "Diesel", aloud, before you lift the nozzle — every time a new or hired car needs its first tank. It seems daft. It does the trick.
- Put the phone away. This is an easy mistake to make whilst you are thinking about something else.
- Add-on devices are available for motors without one, and some diesels are built with a filler that won't accept a petrol nozzle. Useful — but a backstop only, never a reason to stop checking the label.
- The moment you realise, stop: less petrol in your tank makes a thinner mixture. What to do next does not change, though — still do not crank it.
Petrol already in a diesel in Charlton? Begin here
Short and simple, then, is the order of things. Don't turn the ignition on, and don't crank it. Ask the staff to help you roll it clear of the petrol pump if you're still on the forecourt, whether that's Tesco or anywhere else. Next, 0333 366 0103. We'll ask what got in, roughly how much, and if it has been run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate fault — Charlton has a page just for it.
What makes one Charlton petrol in a diesel task cost more than the next
The four scenarios above are four different jobs, so no single quote for this would be honest. Mostly, your cost moves with which one you're in. Where your car is matters too, and whether a van can safely get to it, after the proportion of petrol to what your tank takes.
That's why our technicians ask three questions before quoting instead of after: what was put in, how much, and if it's run. A range turns into a straight figure when those replies are in.
About Charlton
Charlton is a suburban area in Somerset, situated near the River Sheppey and close to the Mendip Hills. Charlton has a mix of housing types, but detached homes are the most common, and the area is around 157 metres above sea level. Charlton is located near several other small settlements, including Field and Cannards Grave, and is within a short drive of the city of Wells. Charlton is also relatively close to other nearby towns, such as Shepton Mallet.
Fuel drain cover across Somerset, Charlton included
The teams answering petrol in diesel calls around Charlton, in the BA postcode area, also work the spots around it, Field, Cannards Grave and Shepton Mallet included. Our engineers drain wherever your car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
At the petrol pump in Charlton, still?
Then, you could not be in a better position. Keep it off. Phone.