Should You Worry? Petrol in a Diesel Car in Old Lakenham
Far less than you likely are, if it has not been started. Petrol sitting in a diesel tank does nothing to your motor until something pulls it through the fuel system — the ignition priming the pump, the starter, or the drive itself. So the fair answer to the first query anyone around Old Lakenham asks, "have I wrecked it?", is generally no. Petrol in Diesel is who to call, with your engine kept off, and so it stays that way. The remainder of this page covers what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it doesn't happen to you a second time.
What petrol in a diesel does to your engine
On its way through a motor, diesel does two jobs. Before it combusts, it lubricates — and then it burns. Very fine tolerances are built into the fuel injectors and your high-pressure pump, and just your diesel flowing through keeps their surfaces from grinding together.
Of these two tasks, petrol manages the first badly and the second never. A pump running on a petrol mixture is wearing itself out, since petrol is thinner than diesel and takes away the protection the fuel system depends on. Petrol is also made to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that's where any rattling starts.
Put these together and the shape of the issue is plain. Contact doesn't do the harm — circulation does. Where that petrol is only in the tank, it is an issue of fuel, nothing more. The beginning of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds moves on with the fuel to the injectors downstream.
Petrol in a diesel around Old Lakenham: how serious is it? Four situations
The best case there can be: filled up, never started. The petrol is inside that tank and just your tank, and the job is a drain and a flush where your car sits. This is the one scenario that can only truly happen on a forecourt, as anywhere else your car has been driven to get there.
Your ignition switched on, or a brief start. The fuel system has been bled, so petrol has left your tank and reached your filter and your lines. Still normally simple: drain, flush, and the filter dealt with.
The pump now spent a couple of miles on thinned fuel — that is what driving it does. The work is the tank, the lines, the fuel filter and clean fuel through the entire system, and how hard the car was driven counts as much as how far. The school run to Edith Cavell Academy and Nursery is one matter. Any miles on the M11, over 50 miles from Old Lakenham, means your engine working hard throughout, and a run to Norwich, under 3 miles away, makes a very different task too.
Driven on until it complained — clattering, smoke, a ragged idle, a dead throttle. What you are hearing is the motor signalling fuel that no longer runs like diesel. Pull up where you are — on the verge on Osbert Close, at the kerb, down a side road — and don't move it again. What goes first is still the fuel drain and flush, and that takes care of it, with permanent damage very uncommon when a car is stopped quickly.
What Old Lakenham people get told about petrol in a diesel — and the stories in it
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing is removed by topping up — you are left with a fuller tank, still the same mixture. That guidance presumes a diesel fuel system handles petrol by percentage. It doesn't.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through finer parts: that's how a current diesel handles its fuel, and so the lubrication counts more, not less.
This is the one that catches drivers. Myth: "If it starts and drives, there's no harm done." Diesel in a petrol motor normally leaves a motor that won't run: the motorist stops, and so does the damage. While your pump wears, a diesel fed petrol usually starts, idles and drives away as if nothing has happened. Running isn't the same as fine.
Myth: a two-stroke additive lets you to drive home. It was an old workaround, supposed for another issue. It does not put back what petrol has diluted, and that petrol is still in that tank later.
Once the engine has been run, part of the petrol sits in the filter and your lines, not your tank — and your next start sends it right back through the pump. So the myth "drain the tank yourself and you're sorted" does not hold. It is also genuinely dangerous to drain petrol into a can at the roadside.
How petrol ends up: petrol in a diesel
On purpose? Never. Through carelessness? Seldom, if ever. The forecourt makes it simple: the petrol nozzle is the narrower of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle mostly won't go into a petrol vehicle at all. So the mistake runs one way.
The moment routine stops matching the car is the moment it occurs. Hire cars, courtesy cars, and vehicles that are new to you. One petrol and one diesel on the drive of the same household. The pumps in a different order on a well-known forecourt. Fuelling up in a hurry on the way to Norwich, with a train to catch. Years of petrol vehicles behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that is when. Your hand does what it has always done when you add rain, a phone call or a back seat full of kids.
Avoiding petrol in a diesel next time you fill up around Old Lakenham
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most generally do. Check the petrol pump's label; the colour is just a clue.
- Plenty of cars state the fuel type inside the filler flap or on the cap, and so check there on your first fill in any car you do not know.
- Label 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.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump. It sounds silly and it does the trick.
- Mistakes like this are easy to make whilst your mind is on something else, and so the phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to reject a petrol nozzle, and aftermarket devices exist for the rest. Treat it as a backstop, and keep checking the pump.
- As soon as you realise, stop: less petrol inside that tank means a weaker mix. What to do next does not change, though — still do not crank it.
Old Lakenham: already put petrol in a diesel?
Short and simple, then, is the order of things. Leave it unstarted, with your ignition off too. If you're still on the forecourt — Asda or anywhere else — ask the staff to help you roll the car away from the pump. What went in, about how much, and whether it's run: tell us that when you phone 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a different problem — Old Lakenham has a page all for it.
One petrol in a diesel task around Old Lakenham costs more than another. Why?
Four separate jobs lie behind the four situations above — which is why there's no fair single price. Which of them you're in is chiefly what moves the cost. The proportion matters next, meaning how much of that tank is petrol, followed by the position of your car and whether reaching it is safe for a technician.
Before any quote, not after, come three queries: the fuel that got in, its amount, and whether it's run. That is why. A range becomes a straight figure when the replies are in.
About Old Lakenham
Old Lakenham is a suburban area situated near the River Yare in Norfolk, with a mix of semi-detached housing and local amenities. Old Lakenham lies close to the city of Norwich, approximately 1.6 miles from the city centre, and is near other local areas such as Long Johns Hill and Tuckswood. Old Lakenham has a relatively low elevation of around 9 metres above sea level, reflecting its riverside setting. Old Lakenham is home to around 3132 residents, according to approximate population figures.
Old Lakenham and Norfolk: where our fuel drain cover runs
Our teams answering petrol in diesel calls in Old Lakenham, in the NR postcode area, also work the locations near it, Long Johns Hill, Tuckswood and Lakenham included. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots our engineers drain, and your car does not need to come to us.
In Old Lakenham and still at the petrol pump?
No position is better: that's where you are. Leave the car turned off, then ring.