Should You Worry? Petrol in a Diesel Car in Kennett End
Less than you probably are, if it hasn't been started. Petrol sitting in a diesel tank does nothing to your engine until something draws it through the system — the ignition priming the pump, your starter, or the drive on its own. So the truthful answer to the first question everyone in Kennett End asks, "have I ruined it?", is normally no. Petrol in Diesel is who to call, with your engine left off, so it stays that way. Below, this page sets out what petrol really does inside a diesel, how far it might have gone, and how to stop it happening to you again.
What petrol in a diesel does to your engine
Two tasks fall to diesel on its route round a motor. It protects to begin with, and only then does it burn. The high-pressure pump and the injectors are built to extremely fine gaps, and your diesel passing through them is what keeps those surfaces from grinding against each other.
Poorly at the first, not at all at the second: that's petrol. Being less viscous than diesel, petrol strips away the protection a fuel system needs, so a pump running on the mixture wearing itself. It's also made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the clattering.
Put those together and the shape of the trouble is plain. It is movement that causes the damage, not contact. Where that petrol is only inside that tank, it's a problem of fuel, nothing more. The start of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with your fuel to the fuel injectors beyond it.
Kennett End, petrol in a diesel: four situations, from mild to significant
The best case there is: filled up, not once started. On a forecourt, and genuinely only there, the petrol is still confined to your tank — because everywhere else the vehicle was driven to get to it. The job is draining and purging on the spot.
Started for a second, or just your ignition on. The system has been primed, so petrol has left your tank and got to the fuel filter and the lines. That's generally still an easy job — a drain, a flush, and the filter seen to.
A couple of miles driven, and the pump has spent each of them labouring on diluted fuel. Distance is only half of that; how hard it was driven counts equally. Either way this work includes that tank, the fuel lines, the fuel filter and clean fuel through the entire system. A school run to Kennett Primary School is one thing. Very different a second time: a run to Ely, under 15 miles away, or any miles on the M11, under 25 miles from Kennett End, where the engine kept labouring hard.
Driven till it protested. Clattering, an uneven idle, smoke, a throttle that has gone soft. The fuel is not acting like diesel any more, and the engine is saying so. Pull up where you are — on the verge on Edgeborough Close, at the kerb, down a side road — and don't move it. What goes first is still the fuel drain and flush-through, and that takes care of it, with lasting damage very unusual if a car is pulled over soon.
What Kennett End motorists get told about petrol in a diesel — and the stories in it
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing is removed by topping up — you are left with a bigger tank, still the same mix. A diesel fuel system doesn't accept petrol by percentage in the way that guidance assumes.
If anything, the reverse is true. Myth: "A modern diesel can cope with a bit of petrol." At higher pressure, through smaller components: that is how a modern diesel moves its fuel, so the lubrication counts for more, not less.
This is the one that catches people. Myth: "If it starts and drives, there's no harm done." The driver of a petrol engine fed diesel usually has no choice but to stop, since it will not run, and the harm stops there. Feed petrol to a diesel and it generally starts, idles and drives away like nothing has happened — all while its pump wears. Fine and running aren't the same thing.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a different issue. None of what petrol thinned gets put back by it — and afterwards, that tank still holds the petrol.
Myth: "Drain that tank yourself and you're sorted." After the motor has been run, some of the petrol is no longer in your tank: it is in the filter and the fuel lines, and it goes straight back through the pump at your next start. Emptying petrol into a can by the kerbside is also truly hazardous.
Petrol in a diesel: how does it occur?
Carelessness is rarely the cause, and nobody means to do it. One way only, since of the nozzles: the slimmer petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one mostly won't fit a petrol car. That's how the forecourt makes it easy.
When habit and your car stop matching, it occurs. A new motor, a hire car or a courtesy car. A household with one petrol and one diesel on the drive. Your normal forecourt, its pumps now in a different order. A train to catch, and a hurried fill on the way to Kennett. Years of petrol cars behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that's when. Throw in a back seat full of children, a phone call or rain, and the hand wins.
Avoiding petrol in a diesel next time you fill up around Kennett End
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most generally do. Read the petrol pump's label; the colour is only a hint.
- In a vehicle you don't know, look inside the flap over your filler or at the cap before the first fill: many cars print the fuel type there.
- Good intentions count for less than a sticker or a fob in a bright colour on your diesel's key when a household has one of each. So label it.
- "Diesel", out loud, before you lift the nozzle — each time a new or hired car gets its first tank. It seems daft. It does the trick.
- While you are thinking about something else, this is an easy mistake to make — so put the phone away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to block a petrol nozzle, and aftermarket devices exist for the remainder. Treat it as a backstop, then keep reading the pump.
- The moment you notice, stop: less petrol inside the tank makes a thinner mix. What to do next does not change, though — still do not crank it.
Petrol already in a diesel around Kennett End? Begin here
Short and simple, then, is the order of things. Starting it is out, and so is turning on your ignition. If you are still at the forecourt — BP or anywhere else — ask the attendants to help you roll the vehicle away from the pump. Phone 0333 366 0103 next, with three answers — your fuel, the approximate amount, and whether it's run.
If it was AdBlue and not petrol, say so. That's a separate problem — corrosion and deposits instead of lost protection — and it has its own page for Kennett End.
Why one petrol in a diesel task around Kennett End costs more than another
The four situations above are four separate jobs, so no single quote for this would be fair. Which of them you are in is chiefly what shifts the cost. Two things come after that: the petrol that was put in as a proportion of what the tank takes, then the place your car is in and whether our van can get to it safely.
Before any quote, not after, we ask three questions: your fuel that got in, the amount, and whether it has run. That's why. A range becomes a straight figure when those replies are in.
About Kennett End and its setting
Kennett End is a locality situated on the riverside in Suffolk, with an elevation of 31 metres, and is located near the cities of Ely and Bury St Edmunds. Kennett End has a population of around 662 people and predominantly features detached housing. Kennett End is close to nearby places such as Kentford, Needham Street, and Kennett, and is about 59 miles from London.
Fuel drain cover across Suffolk, Kennett End included
Petrol in diesel call-outs in Kennett End — part of the CB postcode area — go to teams that also cover the spots about it, Kentford, Needham Street and Kennett included. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations we drain, and your vehicle does not need to move to us.
Kennett End: still at the pump?
The best place there is, then — that is where you are. Phone, and leave it turned off.