Longframlington: Petrol in a Diesel Car? How Worried to Be
If it hasn't been started, worry less than you probably are. "Have I ruined it?" is the first question anyone in Longframlington asks, and the honest answer is generally no, since petrol resting in a diesel tank hurts nothing till it is drawn through the system — by ignition priming, by your starter, or by being driven. Leave your engine off then call Petrol in Diesel — that is how you keep it like that. Below, this page sets out what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you again.
Petrol in a diesel: what does it do to your engine?
Passing through a motor, diesel is doing two things at once. It lubricates first, and only then does it burn. Built to very fine clearances, your injectors and your pump depend on the diesel flowing through them to keep their surfaces from wearing against one another.
Of those two jobs, petrol handles the first badly and the second never. It is runnier than diesel and takes away the protection your fuel system depends on, and so a pump running on a petrol blend is a pump wearing itself. And petrol is made to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That is where the clattering comes from.
Seen together, they show what shape the issue takes. Contact doesn't do the damage — circulation does. Petrol in the tank is a fuel problem. After your pump has been running on that petrol, a mechanical fault has begun: whatever is shed by a pump that is grinding is carried onward to the injectors with your fuel.
How serious is petrol in a diesel? Four scenarios our engineers see in Longframlington
Filled up, never started. The best case there is. Being on a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With the petrol held inside your tank alone, it's cleared and cleaned on the spot, and nothing more is needed.
A brief spell of running, or merely your ignition on. With the fuel system primed, the lines and filter already hold petrol that has come from that tank. Normally little more than emptying, purging and seeing to the filter, so still straightforward.
Those few miles driven were your pump labouring on fuel diluted by petrol throughout. How hard the vehicle was driven counts as much as how far, and the work takes in the tank, the lines, the filter and fresh fuel through the whole circuit. Short trips, such as the school run to Swarland Primary School, are one thing. A run as far as Newcastle upon Tyne, under 25 miles away, is a very different task. So is any distance on the A167(M), under 25 miles from Longframlington, where the motor has been running hard throughout.
Driven on until it complained — knocking, smoke, a lumpy idle, a soft throttle. The fuel is not acting like diesel any more, and your motor is saying so. Leave it where it stops: a lay-by, a side street, the verge on Church Street. What comes first is still the drain and flush-through, and that sorts it out, with long-term damage very uncommon when a vehicle is pulled over soon.
Longframlington motorists and the petrol in a diesel stories they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Topping up removes nothing; it gives you a bigger tank of the same mix. That guidance supposes a diesel fuel system handles petrol by percentage. It does not.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the reverse. At higher pressure, through smaller parts: that is how a current diesel moves its fuel, so the lubrication matters more, not less.
This is the one that catches people. Myth: "If it starts and drives, there is no damage done." Diesel in a petrol motor generally leaves a motor that won't run: the driver stops, and so does the damage. A diesel fed petrol normally starts, ticks over and drives away as though nothing has happened, whilst your pump wears. Being able to run is not the same as being fine.
An outdated fix for a different fault lies behind this one. Myth: "Add some two-stroke oil and drive it home." It doesn't put back what petrol has thinned, and that petrol is still in the tank later.
The next start sends petrol back round your pump out of your lines and the filter, where some of it sits after the engine has run. That's why a DIY tank drain doesn't leave you sorted — a myth. And, a can of petrol filled by the roadside is truly dangerous.
How petrol ends up: petrol in a diesel
It's rarely carelessness, and no one does it on purpose. A diesel nozzle mostly won't go into a petrol car, but the slimmer petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake straightforward, and just in that direction.
The moment habit stops matching your car is the moment it takes place. Hire cars, courtesy cars, and vehicles that are new to you. Two motors on one drive, one petrol, one diesel. Your ordinary forecourt, its pumps suddenly in a different order. A train to catch, and a hurried fill on the way to Acklington. A new-to-you diesel Renault Megane, its first fuelling, and a driver used to petrol: exactly when it occurs. Add a back seat full of kids, a phone call or rain, and habit wins.
Avoiding petrol in a diesel next time you fill up around Longframlington
- A green handle for unleaded and black for diesel is normal in the UK — but not on every forecourt. Trust the label on the pump, not the colour.
- Many cars state the fuel type inside your filler flap or on the cap, and so check there on your first fill in any car you do not know.
- Mark the key. In a home with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- Before the nozzle comes off the pump the first time you fuel a hired or new motor, say "diesel" aloud. Daft, yes, yet it works.
- Mistakes like this are simple to make whilst your mind is on something else, and so the phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject a petrol nozzle, and add-on devices are available for motors without one. They are a backstop, not a reason to stop reading the pump.
- Stop the moment you notice. Less petrol in the tank makes a weaker mix. It does not change what to do next, which is still not to fire it up.
Put petrol in a diesel in Longframlington already?
Short and simple, then, is the order of things. Don't fire it up, and don't switch the ignition on. The staff at the forecourt — whether at the nearest petrol station itself or wherever you filled up — will normally help push it away from the pump if you ask. Call 0333 366 0103 next, with three answers — your fuel, the rough amount, and if it's run.
Say so if it was AdBlue rather than petrol: it is a separate fault, with its own page for Longframlington, since AdBlue brings corrosion and deposits rather than lost protection.
Longframlington petrol in a diesel jobs: why one costs more than another
The four scenarios above are four separate tasks, so no single quote for this would be honest. Mostly, your cost shifts with which situation you're in. Two things come after that: the petrol that got in as a share of what your tank takes, then the place the vehicle is in and whether our van can get to it safely.
That's why our engineers ask three questions before pricing rather than after: what went in, how much, and whether it has run. Those replies are what turn a range into one firm number.
About Longframlington, briefly
Longframlington is a rural village in Northumberland, situated inland at an elevation of 156 metres, and is located approximately 23.6 miles from Newcastle upon Tyne. Longframlington has a population of around 1060 people and is characterised by predominantly detached housing. Longframlington sits near other small settlements such as North End and Healey Cote, and is about 271 miles from London.
Fuel drain cover around Longframlington and across Northumberland
The teams answering petrol in diesel call-outs in Longframlington, in the NE postcode area, also work the spots around it, North End, Healey Cote and Weldon included. We drain wherever the vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the pump in Longframlington?
Then you are in the best place there is. Switched off it remains; then call.