High Heaton: Petrol in a Diesel Car? How Worried to Be
Not started? Then less worried than you probably are. "Have I wrecked it?" is the first thing anyone in High Heaton asks, and the honest answer is usually no, because petrol left in a diesel tank hurts nothing till it is dragged through the fuel system — by ignition priming, by your starter, or by driving. To leave it like that, call Petrol in Diesel and leave the engine alone. Further down, you will find what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you again.
Inside the engine: what petrol in a diesel really does
Diesel does two jobs on its way through a motor. It protects first, and only then does it burn. Your high-pressure pump and your injectors are made to extremely fine gaps, and your diesel passing through them is what keeps those surfaces from wearing down against each other.
The second task petrol doesn't do at all, and the first it does poorly. Being less viscous than diesel, petrol strips away the lubrication a fuel system needs, so a pump on that mixture wearing itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is where you hear the rattling.
Put those together and the shape of the trouble is clear. It is circulation that causes the harm, not contact. Petrol in the tank is a fuel problem. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with your fuel to the injectors downstream.
How bad is petrol in a diesel? Four scenarios our technicians see around High Heaton
Filled up, and never started: nothing beats it. That petrol is inside the tank and just that tank, and the job is a drain and a flush where your car sits. This is the one situation that can only truly happen on a forecourt, since anywhere else the car has been driven to get there.
Ignition on, or started for a second. With the system primed, the fuel lines and filter already contain petrol that has come from the tank. Still usually easy: drain, flush, and the fuel filter dealt with.
Your pump now worked a couple of miles on thinned fuel — that is what driving the vehicle does. How hard your car was driven counts as much as how far, and the work covers that tank, your lines, the filter and clean fuel through the whole system. Short trips, such as the school run to Cragside Primary School, are one thing. Getting as far as Newcastle upon Tyne, under 3 miles away, makes a very different task — as does any distance on the A167(M), under 3 miles from High Heaton, with the motor running hard the whole time.
Driven on until it protested — rattling, smoke, a lumpy idle, a soft throttle. That is the motor telling you its fuel no longer is acting like diesel. Leave it where it stops: a lay-by, a quiet street, the verge on Teviotdale Gardens. Long-term damage is very unusual when a car is pulled over soon, and the drain and flush that still go first deal with it.
High Heaton motorists and the petrol in a diesel stories they hear
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Topping up removes nothing; it gives you a fuller tank of the same mixture. A diesel fuel system does not tolerate petrol by percentage in the way that guidance presumes.
"Newer diesels can handle a little petrol" — a myth, and closer to the opposite. A newer diesel runs its fuel through smaller components at higher pressure, which makes the protection count more, not less.
This is the one that catches motorists. Myth: "If it starts and drives, there's no damage done." A petrol engine fed diesel normally will not run, so the driver stops and the harm stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile the pump grinds. Running does not mean fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct problem. That petrol is still in the tank after that, and what it has weakened is not put back.
If your engine has been run, part of the petrol sits in your filter and your lines, not your tank — and your next start sends it straight back through the pump. So the myth "drain your tank yourself and you're sorted" does not hold. Clearing petrol into a can by the roadside is also really risky.
How it happens: petrol in a diesel
A careless moment is seldom the cause, and nobody means to do it. The forecourt makes it simple: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle mostly will not go into a petrol vehicle at all. So the error runs one way.
It takes place when habit and the vehicle stop matching. Hire cars, courtesy cars, and vehicles that are new to you. One petrol and one diesel on the driveway of the same household. A familiar forecourt with the pumps in a different order. Racing for a train at Manors and fuelling up en route. Years of petrol vehicles behind you, a diesel Renault Megane in front of you at the forecourt for its first tank — that's when. Throw in rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
Avoiding petrol in a diesel next time you fill up in High Heaton
- A green handle for unleaded and black for diesel is normal in the UK — but not on each forecourt. Go by the label on the petrol pump, not the colour.
- The first fill in a strange vehicle is the time to check your filler flap — inside it, or on the cap, many cars 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, for a home with one of each.
- "Diesel", out loud, before you pick up the nozzle — every time a new or hired car gets its first tank. It seems daft. It works.
- Mistakes like this are easy to make while 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 are available for the rest. Count it as a safety net, and keep checking the pump.
- Stop as soon as you notice. Less petrol inside that tank makes a weaker mix. It does not change what to do next, which is still not to start the car.
High Heaton: already put petrol in a diesel?
The order of things is short, then. Leave it unstarted, with the ignition off too. Ask the attendants to help you roll it away from the petrol pump if you're still on the forecourt, whether that's Sainsbury's or somewhere else. Then phone 0333 366 0103 and tell us what went in, about how much, and whether it's run.
If it was AdBlue rather than petrol, say so. That's a different issue — corrosion and deposits instead of lost lubrication — and it has its own page for High Heaton.
What makes one High Heaton petrol in a diesel job cost more than the next
Four different jobs sit behind the four scenarios above — which is why there's no honest single price. The scenario itself does most of the work of moving the cost. Two things come after that: the petrol that got in as a proportion of what that tank takes, then the spot the car is in and whether our van can get to it safely.
What got in, how much, and if it's run — three questions our technicians ask before costing, not after, for exactly that reason. Their replies are what change a range into one firm number.
About High Heaton, briefly
High Heaton is a suburban area located near Newcastle upon Tyne, sitting at an elevation of 59 metres in the north east of England. High Heaton is characterized by its semi-detached housing and is situated close to nearby places such as Heaton, Jesmond, and West Jesmond. High Heaton has a population of approximately 7000 residents and is just 1.8 miles from Newcastle upon Tyne, making it a convenient residential location. High Heaton is also relatively distant from London, being around 248.6 miles away.
Fuel drain cover in High Heaton and across Tyne and Wear
Our vans answering petrol in diesel call-outs in High Heaton, in the NE postcode area, equally work the places near it, Heaton, Jesmond and West Jesmond included. A forecourt, a supermarket car park, a lay-by or your own drive are all locations our engineers work, and the car doesn't need to move to us.
In High Heaton and still at the petrol pump?
The best place there is, then — that's where you are. Keep the vehicle turned off, then ring.