Rushden: Petrol in a Diesel Car? How Worried to Be
Unstarted? Then less worried than you probably feel. Until the ignition primes the pump, the starter cranks, or your vehicle is driven, petrol in a diesel tank just sits there and does nothing. Which means the truthful reply to the first Rushden query — "have I wrecked it?" — normally no. Keep it like that: leave the motor off then call Petrol in Diesel. Below, this page sets out what petrol really does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
Your engine and petrol in a diesel: what happens
Diesel does two tasks on its way through an engine. It ignites, and before it combusts it protects. Built to very fine tolerances, the injectors and the pump rely on the diesel flowing through them to keep their surfaces from wearing against one another.
Poorly at the first, not at all at the second: that's petrol. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, leaving a pump running on the blend to wear itself. It's equally made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the clattering.
The shape of the issue is plain when you put those together. Not contact but movement is what causes the damage. Petrol in a tank is a fuel issue. The start of a mechanical one is a pump that has been running on that petrol — and whatever a worn pump sheds travels on with the fuel to the injectors downstream.
Rushden, petrol in a diesel: four cases, from mild to major
Filled up, and never started: no case is better. That petrol is inside your tank and just your tank, and the task is a drain and a flush where the car stands. This is the one situation that can only truly take place at a forecourt, as anywhere else the car has been driven to get there.
Your ignition turned on, or a short start. Once primed, your system has pulled petrol out of your tank as far as the fuel filter and the fuel lines. Usually little more than emptying, rinsing and sorting the filter, so still simple.
Your pump has spent a couple of miles on diluted fuel — that's what driving the vehicle meant. Tank, lines, filter, then fresh fuel put through the whole circuit: that's this work, and the way the car was driven counts as much as the distance. The school run to Alfred Lord Tennyson School is one thing. Very different a second time: a trip to Milton Keynes, under 25 miles away, or some mileage on the M1, under 15 miles from Rushden, where the motor never stopped labouring hard.
Driven till it complained. Clattering, a lumpy idle, smoke, a throttle that has gone soft. What you are hearing is the engine reporting fuel that no longer behaves like diesel. Stop wherever you are — the verge on College Street, a lay-by, a side street — and leave the vehicle where it is. What goes first is still the drain and flush-through, and that takes care of it, with permanent damage very rare if a car is stopped quickly.
Rushden motorists and the petrol in a diesel myths they hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Topping up takes out nothing; it gives you a bigger tank of the same mix. Percentage isn't how a diesel fuel system copes with petrol, however much that guidance supposes.
Myth: a newer diesel copes with a bit of petrol. If anything, the reverse. Smaller components 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 motorists off guard: if it starts and drives, it must be unharmed. Diesel in a petrol motor usually means a motor that won't run: the driver stops, and so does the damage. Whilst your pump grinds, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Running is not the same as fine.
Not so: a two-stroke additive makes it safe to drive home. It was an old workaround, supposed for another fault. The petrol is still inside that tank afterwards, and what it has diluted isn't put back.
If your engine has run, part of that petrol is in the fuel filter and your lines, not the tank — and the next start sends it straight back through the pump. So the myth "drain that tank yourself and you are sorted" does not stand up. It is also truly hazardous to drain petrol into a can at the kerbside.
How it happens: petrol in a diesel
No one does it on purpose, and it is rarely carelessness. A diesel nozzle mostly will not fit a petrol car, but the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake easy, and just in that direction.
It occurs when habit and the vehicle stop matching. Courtesy car, hire car, or a vehicle that's new. Households running one of each, petrol and diesel. The pumps in a different order on a familiar forecourt. Rushing for a train outside Wellingborough and filling up en route. Years of petrol motors behind you, a diesel Renault Clio in front of you on the forecourt for its first tank — that's when. Add rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
Rushden drivers: how to prevent petrol in a diesel next time
- A green handle for unleaded and black for diesel is usual in the UK — yet not on each forecourt. Go by the label on the petrol pump, not the colour.
- The first fill in an unfamiliar vehicle is the time to check the filler flap — on it, or on the cap, plenty of vehicles state the fuel to use.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, in a household with one of each.
- Before the nozzle comes off the pump the first time you fill a hired or new motor, say "diesel" out loud. Daft, yes, but it does the trick.
- Tuck your phone away. This is an easy mistake to make whilst you're thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to refuse a petrol nozzle, and aftermarket devices are available for the rest. Count it as a safety net, then keep checking the petrol pump.
- As soon as you realise, stop: less petrol in the tank makes a weaker mixture. What to do next does not change, though — still don't fire it up.
Rushden: already put petrol in a diesel?
The order of things is short, then. Starting it is out, and so is switching on the ignition. Yet at the forecourt, at Asda or anywhere else? Ask the attendants to help you roll the car clear of the petrol pump. Next, 0333 366 0103. We will ask what was put in, roughly how much, and if it has been run.
Say so if it was AdBlue instead of petrol: it is a different fault, with its own page for Rushden, because AdBlue brings corrosion and deposits instead of lost lubrication.
What makes one Rushden petrol in a diesel task cost more than the next
An honest single price does not exist here: four situations, four separate tasks. The scenario itself does most of the work of moving the cost. Two things follow that: the petrol that got in as a proportion of what the tank takes, then the spot your car is in and whether our van can reach it safely.
Three queries come first, before quoting, instead of after — what got in, how much, has it run — and that is the reason. The answers change a range into a straight figure.
About Rushden itself
Rushden is a town situated in the East Midlands region of England, on the banks of the River Nene in Northamptonshire. Rushden sits at an elevation of 62 metres, with nearby settlements including Warmonds Hill, Higham Ferrers, and Little Wymington. Rushden has a population of approximately 29671 people, predominantly living in semi-detached housing. Rushden is located 57.7 miles from London and 18.4 miles from Milton Keynes, making it a commuter town with good transport links.
Across Northamptonshire and in Rushden: fuel drain cover
The vans answering petrol in diesel call-outs in Rushden, in the NN postcode area, equally work the locations around it, Warmonds Hill, Higham Ferrers and Little Wymington among them. A forecourt, a supermarket car park, a lay-by or your own drive are all locations our engineers work, and your car does not need to come to us.
Rushden: still at the petrol pump?
Then you're in the best spot there is. Ring, and leave it turned off.