Hunt End: Petrol in a Diesel Car? How Worried to Be
Not started? Then less anxious than you likely are. Till your ignition primes your pump, the starter cranks, or the car is driven, petrol in a diesel tank simply waits there and does no harm. Which makes the honest reply to that first Hunt End question — "have I wrecked it?" — usually no. Keep it like that: leave your motor off and call Petrol in Diesel. The remainder 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 a second time.
Petrol in a diesel: what does it do to your engine?
Diesel has two tasks on its way through a motor. It burns, and before it combusts it protects. What stops the surfaces inside your high-pressure pump and the injectors from wearing down against each other is your diesel flowing through them — they're built to very fine clearances.
Petrol does the first task poorly and the second not at all. A pump working on a petrol mix is wearing itself out, because petrol is runnier than diesel and takes away the lubrication your fuel system depends on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that is where any clattering comes.
Together, those make the shape of the issue plain. Not contact but circulation is what causes the harm. Petrol in a tank is a fuel fault. Once your pump has been labouring on that petrol, a mechanical fault has begun: whatever is shed by a pump that's grinding is carried onward to the injectors with the fuel.
Four scenarios we see around Hunt End: how serious is petrol in a diesel?
Filled up, and not started: no case is better. Being on a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With the petrol kept in the tank alone, it's cleared and rinsed on the spot, and nothing more is needed.
Ignition on, or started for a moment. With your system primed, the fuel lines and filter now hold petrol that came from your tank. That is normally still a straightforward task — a drain, a flush, and your filter dealt with.
Those few miles driven meant the pump working on fuel diluted by petrol throughout. The work is your tank, the fuel lines, the fuel filter and clean fuel through the entire system, and how hard the vehicle was driven matters as much as how far. On the school run to Crabbs Cross Academy, the distance is small. Very different again: a trip to Worcester, under 15 miles away, or any distance on the M42, under 10 miles from Hunt End, where your engine never stopped working hard.
Driven till it complained. Knocking, an uneven idle, smoke, a throttle that has gone soft. That is the motor telling you its fuel has stopped acting like diesel. Pull up wherever you are — the verge on Weavers Close, a lay-by, a side street — then leave the car there. The fuel drain and flush-through still go first, and they deal with it: if a car is stopped quickly, long-term damage is very unusual.
Myths Hunt End people hear about petrol in a diesel
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. A fuller tank of the same mixture is all you get, since topping up takes out nothing. The assumption behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
"Newer diesels can handle a little petrol" — a myth, and nearer the reverse. At higher pressure, through smaller components: that's how a modern diesel handles its fuel, and so the lubrication counts for more, not less.
This is the one that catches drivers. Myth: "If it starts and drives, there's no damage done." The motorist of a petrol engine fed diesel usually has no choice but to stop, because it will not run, and the damage stops there. A diesel fed petrol generally starts, idles and drives away as if nothing has happened, whilst your pump wears. Fine and running aren't the same at all.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate issue. None of what petrol thinned is put back by it — and afterwards, the tank still contains the petrol.
If the engine has been run, part of that petrol sits in the fuel filter and your lines, not that tank — and the next start sends it straight back through the pump. So the myth "drain the tank yourself and you're sorted" does not hold. On top of that, petrol cleared into a can by the road is truly risky.
Petrol in a diesel: how does it occur?
No one does it on purpose, and it's rarely carelessness. A diesel nozzle mostly will not fit a petrol motor, yet the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake simple, and only in that direction.
It takes place when habit and the car stop matching. A car that's new to you — a hire car, on loan as a courtesy car, or brand new. A household with one petrol and one diesel on the drive. Your usual forecourt, its pumps suddenly in a different order. A rushed fill on the way to Redditch with a train to catch. Exactly the moment it takes place: after years of driving petrol, someone fills a diesel Renault Clio for the first time. With rain, a call coming in, or a car full of children to deal with, the hand just does what it has always done.
Hunt End people: how to prevent petrol in a diesel next time
- Green for unleaded and black for diesel is usual in the UK — but not on every forecourt. Go by the label on the pump, not the colour.
- Inspect the filler flap. Plenty of vehicles state the fuel type inside the flap or on the cap. Look at it on the first fill in any motor 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.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It sounds daft and it works.
- While you're thinking about something else, this is an easy mistake to make — so put your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to refuse a petrol nozzle, and add-on devices exist for the remainder. Treat it as a safety net, and keep checking the petrol pump.
- Stop the moment you notice. Less petrol in your tank makes a thinner blend. It does not change what to do next, which is still not to crank it.
Petrol already in a diesel in Hunt End? Start here
In that case, there's only a short order of things. Leave it unstarted, with your ignition switched off too. Yet at the forecourt, at Gulf or anywhere else? Ask the staff to help you push the car clear of the pump. Ring 0333 366 0103 next, with three facts — the fuel, the approximate amount, and if it has run.
If it was AdBlue rather than petrol, say so. That's a different fault — corrosion and deposits instead of lost protection — and it has its own page for Hunt End.
Why one petrol in a diesel job in Hunt End costs more than another
Four separate tasks lie behind the four scenarios above — which is why there's no fair single quote. What shifts the cost is chiefly which of them you are in. Two things follow that: the petrol that went in as a proportion of what the tank holds, then the spot your car is in and whether our van can get to it safely.
Three queries come first, before any quote, rather than after — what was put in, how much, has it run — and this is the reason. A range becomes a straight figure once those replies are in.
About Hunt End and its setting
Hunt End is a suburban area situated on the riverside in Worcestershire, with a mix of detached housing and a population of around 2165 residents. Hunt End lies approximately 12.8 miles from Worcester and 94 miles from London, placing it in a relatively rural setting. Hunt End is near other local places such as Dagtail End, Crabbs Cross, and Walkwood, and its elevation of 120 metres gives it a gentle outlook over the surrounding countryside. Hunt End remains a quiet residential community with a strong sense of local identity.
Hunt End and Worcestershire: where our fuel drain cover runs
Dagtail End, Crabbs Cross and Walkwood are among the places near Hunt End that the same teams work, answering petrol in diesel call-outs across Hunt End's B postcode area. The car does not need to come to us: our engineers drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
In Hunt End and still at the petrol pump?
In that case, you couldn't be in a better position. Keep it off. Ring.