Should You Worry? Petrol in a Diesel Car in Rogiet
Provided it has not been started, worry far less than you likely are. "Have I wrecked it?" is the first question everyone in Rogiet asks, and the honest answer is generally no, because petrol resting in a diesel tank hurts nothing till it is dragged through the fuel system — by ignition priming, by your starter, or by driving. Keep it like that: leave the engine off and phone Petrol in Diesel. Below, this page sets out what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you again.
Petrol in a diesel: what does it do to your engine?
Two jobs fall to diesel on its journey through a motor. It lubricates first, and after that does it burn. The high-pressure fuel pump and the fuel injectors are built to extremely fine gaps, and your diesel passing through them is what keeps those surfaces from grinding against one another.
Of those two jobs, petrol handles the first poorly and the second not at all. The rattling comes from petrol being designed not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection the fuel system hinges on, and any pump working on such a blend is wearing itself.
The shape of the trouble is plain once you put those together. The damage is done by movement, not by contact. Petrol in a tank is a fuel issue. After your pump has been labouring on that petrol, a mechanical issue has started: whatever is shed by a pump that is wearing down is carried downstream to the injectors with the fuel.
Petrol in a diesel around Rogiet: how bad is it? Four situations
Filled but never started — as good as it gets. Only the tank has petrol in it, and so the job is draining that tank and cleaning the fuel system where the vehicle stands. This scenario can only really occur at a forecourt: anywhere else, the car got there by being driven.
A moment's running, or merely your ignition on. Your system has been bled, so petrol has left the tank and got to the fuel filter and your lines. Still normally straightforward: drain, flush, and the filter dealt with.
Those few miles on the road meant the pump labouring on fuel diluted by petrol the whole way. Tank, lines, filter, then clean fuel put through the entire system: that's the work, and the way the car was driven counts as much as the distance. On the school run to the local primary school, the distance is short. Very different once more: a trip to Newport, under 10 miles away, or any mileage on the M48, under a mile from Rogiet, where the motor never stopped running hard.
Rattling, a lumpy idle, smoke, a throttle gone soft: driven till it complained. The motor is telling you the fuel is no longer behaving like diesel. Leave it where it stops: a lay-by, a quiet street, the verge on South Grove. What goes first is still the fuel drain and flush-through, and that sorts it out, with long-term damage very unusual when a car is stopped soon.
Stories Rogiet people hear about petrol in a diesel
Myth: topping up to full with diesel makes it fine. It doesn't. A fuller tank of the same mix is all it gives, since topping up takes out nothing. The idea behind the advice — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. Finer parts and higher pressure are the way a current diesel runs its fuel, and that makes the protection count more, not less.
One myth that catches people off guard: if it starts and drives, it must be unharmed. The driver of a petrol engine fed diesel normally stops, since it will not run, and the harm stops there. While the pump grinds, a diesel fed petrol normally starts, idles and drives away as though nothing has happened. A running engine doesn't mean fine.
Not so: a two-stroke additive lets you to drive home. It is an old fix, supposed for another problem. None of what petrol weakened gets put back by it — and later, that tank still contains that petrol.
The next start draws petrol back round the pump out of the lines and your filter, where some of that ends up once the motor has been run. That's why draining the tank yourself doesn't sort it — a myth. Clearing petrol into a can at the kerbside is also really hazardous.
Petrol in a diesel: how does it happen?
No one does it on purpose, and it is rarely carelessness. One way only, since of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol vehicle. That's how the forecourt makes it easy.
When habit and your car stop matching, it takes place. Hire cars, courtesy cars, and vehicles that are new to you. One petrol and one diesel on the drive of the same household. A familiar forecourt with the pumps in a different order. Filling up in a rush on the way to Severn Tunnel Junction, with a train to catch. Precisely the moment it happens: after years of driving petrol, a driver fills a diesel Renault Megane for the first time. Throw in rain, a phone call or a back seat full of kids, and the hand repeats what it has always done.
Preventing petrol in a diesel next time you fill up around Rogiet
- Read the pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on each forecourt. The label is what matters.
- Plenty of motors state the fuel inside the filler flap or on the cap, and so check it on your first fill in a car you do not know.
- Mark the key. In a house with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- "Diesel", out loud, before you pick up the nozzle — each time a new or hired car gets its first tank. It seems daft. It works.
- Tuck the phone away. This is an easy mistake to make whilst you are thinking about something else.
- Add-on devices are available for vehicles without one, and some diesels are built with a filler that won't accept a petrol nozzle. Useful — but a safety net at best, never a reason to stop checking the label.
- Spotting it mid-fill? Stop at once. A thinner mixture follows from less petrol inside your tank, but the next stage remains the same: do not start it.
Put petrol in a diesel in Rogiet already?
Then, there is only a short order of things. Leave it unstarted, with your ignition off too. If you're still on the forecourt — BP or anywhere else — ask the attendants to help you roll the vehicle away from the pump. Next, 0333 366 0103. We'll ask what went in, about how much, and if it has been run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate problem — Rogiet has a page all for it.
What makes one Rogiet petrol in a diesel job cost more than the next
Four separate tasks sit behind the four situations above — which is why there's no fair single quote. Which of them you are in is mostly what shifts the cost. After that it's the proportion — how much petrol got in against how much the tank holds — and then where the vehicle is and whether a technician can get to it safely.
What was put in, how much, and whether it has run — three questions we ask before quoting, not after, for precisely that reason. Those replies turn a range into a straight figure.
About Rogiet, briefly
Rogiet is a small village in Monmouthshire, situated near the coast and approximately 9 miles from Newport. Rogiet has a population of around 1791 people and is characterised by semi-detached housing. Rogiet sits at a low elevation of 12 metres, close to the nearby settlements of Llanfihangel near Rogiet and Highmoor Hill. Rogiet is also near Brockwells, a local area of interest.
Across Monmouthshire and in Rogiet: fuel drain cover
Llanfihangel near Rogiet, Highmoor Hill and Brockwells are among the spots near Rogiet that the same vans work, answering petrol in diesel call-outs across Rogiet's NP postcode area. You need not move the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places we drain.
Rogiet: still at the petrol pump?
In that case, you could not be in a better spot. Leave it switched off, and ring.