Should You Worry? Petrol in a Diesel Car in Lower Weedon
If it hasn't been started, you can worry less than you likely are. Until your ignition primes the pump, your starter turns, or the car is driven, petrol in a diesel tank simply waits there and does no harm. Which makes the truthful reply to the first Lower Weedon query — "have I wrecked it?" — normally no. Keep it like that: leave the engine 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?
Two jobs fall to diesel on its journey through a motor. It lubricates first, and after that does it burn. Very fine clearances go into the fuel injectors and the high-pressure pump, and just your diesel running through stops their surfaces grinding together.
Of these two tasks, petrol handles the first badly and the second never. The rattling comes from petrol being made not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips out the lubrication the system rests on, and any pump running on that mix is wearing itself.
The shape of the problem is clear when you put those together. Not contact but movement is what does the damage. A tank with petrol in it is a fuel fault. 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 Lower Weedon: how serious is it? Four cases
Fuelled up, never started. The best case there is. Only that tank has petrol in it, so the task is emptying your tank and purging the fuel system where your car stands. This scenario can only really happen at a forecourt: anywhere else, the vehicle got there by being driven.
A moment's running, or merely the ignition on. Petrol has come out of that tank and got to the filter and the fuel lines, because the fuel system has been primed. Drain, flush, see to the fuel filter: still normally simple.
Some miles driven, and your pump has spent every one of them running on weakened fuel. How hard the vehicle was driven counts as much as how far, and the work takes in your tank, the fuel lines, the filter and fresh fuel through the whole circuit. Driving the kids to Weedon Bec Primary School is one sort of trip. Driving as far as Milton Keynes, under 25 miles away, makes a very different job — as does any miles on the M1, under 3 miles from Lower Weedon, with the motor working hard all the way.
Driven on till it protested — rattling, smoke, a ragged idle, a soft throttle. What you are hearing is your engine signalling fuel that no longer runs like diesel. Whether it's the verge on New Croft, a lay-by or a side street, stop where you are then leave it. A vehicle stopped early very rarely has lasting damage, since the drain and the flush, which still come first, take care of it.
Petrol in a diesel myths Lower Weedon drivers hear
False: topping up to full with diesel makes it fine. It does not. Nothing is removed when you top up — the tank simply carries more of the same mixture. A diesel fuel system doesn't accept petrol by percentage in the way that advice assumes.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. Lubrication counts more on modern diesels, not less, because their fuel runs through smaller components at higher pressure.
"It starts, it drives, and so no harm done" — the myth that trips up more motorists than any other. Feed diesel to a petrol motor and it usually will not run, and so the motorist stops — and the harm stops with them. Feed petrol to a diesel and it generally fires up, idles and pulls away as if nothing happened — all the while its pump wears. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It's an outdated workaround for a separate fault. What petrol has thinned remains diluted, and that petrol remains in that tank regardless.
Once your engine has run, part of that petrol sits in the fuel filter and the fuel lines, not your tank — and your next start pulls it straight back through your pump. So the myth "drain that tank yourself and you are sorted" doesn't stand up. On top of that, petrol cleared into a can by the road is truly dangerous.
Petrol in a diesel: how does it occur?
No one does it on purpose, and it is rarely carelessness. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol vehicle at all. The forecourt makes it simple, and the error runs one way.
It happens when routine and the car stop matching. Hire cars, courtesy cars, and motors 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. A train to catch, and a rushed fill on the way to Long Buckby. Exactly the moment it takes place: after years of driving petrol, a driver fills a diesel Volkswagen Passat for the first time. Throw in a back seat full of children, a phone call or rain, and habit wins.
Lower Weedon people: how to prevent petrol in a diesel next time
- The label is what matters, and so read the pump instead of the colour: in the UK unleaded handles are normally green and diesel black, yet not on each forecourt.
- Inspect your filler flap. Many motors state the fuel inside the flap or on the cap. Look at it on your first fill in a car you don't know.
- Label 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.
- Before the nozzle leaves the petrol pump the first time you fill a hired or new motor, say "diesel" out loud. Silly, yes, yet it works.
- While you're thinking about something else, this is an easy mistake to make — so tuck the phone away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler built to refuse a petrol nozzle, and add-on devices exist for cars without one. They are a backstop, not a reason to stop reading the pump.
- Spotting it halfway? Stop there and then. A weaker mix results from less petrol in that tank, but the next stage remains the same: do not crank it.
Petrol already in a diesel around Lower Weedon? Start here
Then, there's just a short order of things. Leave it unstarted, with your ignition switched off too. Ask the attendants to help you roll it away from the pump if you are still on the forecourt, whether that is Shell or somewhere else. What went in, roughly how much, and whether it has run: tell us those when you phone 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a different fault — Lower Weedon has a page just for it.
Why one petrol in a diesel task in Lower Weedon costs more than another
Four different jobs lie behind the four situations above — which is why there's no fair single quote. The situation itself does most of the work of moving your cost. After that it's the proportion — how much petrol got in against how much the tank holds — and after that where the vehicle is and whether our van can get to it safely.
What got in, how much, and whether it has run — three questions our engineers ask before quoting, not after, for exactly that reason. Those replies are what turn a range into one firm number.
About Lower Weedon
Lower Weedon is a suburban area in Northamptonshire, situated on the riverside at an elevation of around 95 metres. Lower Weedon lies near the larger town of Weedon Bec and is part of a group of settlements that include Upper Weedon and Road Weedon. Lower Weedon has a population of approximately 1714 people and predominantly consists of semi-detached housing. Lower Weedon is located near Milton Keynes, about 18.9 miles away, and is around 64.3 miles from London.
Across Northamptonshire and around Lower Weedon: fuel drain cover
Petrol in diesel calls around Lower Weedon — part of the NN postcode area — go to teams that likewise cover the locations round it, Weedon Bec, Upper Weedon and Road Weedon among them. The vehicle doesn't need to come to us: our technicians drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
Lower Weedon: still at the petrol pump?
The best position there is, then — that is where you are. Turned off it stays; then phone.