Petrol in a Diesel Car in Heighington: How Worried Should You Be?
Provided it has not been started, you can worry less than you likely are. "Have I ruined it?" is the first thing anyone around Heighington asks, and the truthful answer is normally no, since petrol left in a diesel tank hurts nothing until it's drawn through your fuel system — by ignition priming, by the starter, or by driving. Keep it that way: leave the engine off and call Petrol in Diesel. Read on for three things: the effect petrol has inside a diesel engine, the signs of how far it has spread, and the way to make sure you never do it again.
The engine and petrol in a diesel: what happens
Passing through an engine, diesel is doing two jobs at once. Before it combusts, it lubricates — then it burns. Made to extremely fine tolerances, the fuel injectors and the pump depend on your diesel moving through them to stop their surfaces 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 that mixture wearing itself. It's also made to resist igniting under compression — the opposite of what a diesel needs — which is where you get the clattering.
Taken together, they show what shape the problem has. The damage is done by circulation, not by contact. Petrol in the tank is a fuel problem. Once your pump has been working on that petrol, a mechanical fault has begun: whatever is shed by a pump that is wearing travels onward to the fuel injectors with the fuel.
How serious is petrol in a diesel? Four scenarios our engineers see in Heighington
The best case there is: filled up, never started. The petrol is in that tank and just your tank, and the task is a drain and a flush where your car sits. This is the one situation that can only truly happen at a forecourt, since anywhere else the vehicle has been driven to get there.
Started for a moment, or only the ignition on. Your system has been bled, and so petrol has left your tank and reached the filter and the fuel lines. That is generally still a straightforward task — a drain, a flush, and the fuel filter seen to.
A couple of miles driven, and the pump has spent every one of them labouring on thinned fuel. The work is your tank, the fuel lines, your filter and clean fuel through the whole circuit, and how hard the vehicle was driven matters as much as how far. A school run to Heighington Church of England Primary School is one thing. Driving as far as Durham, under 15 miles away, makes a very different task — as does any miles on the A1(M), under 3 miles from Heighington, with the engine working hard the whole time.
Driven on till it complained — knocking, smoke, a ragged idle, a soft throttle. The engine is telling you your fuel is no longer behaving like diesel. Whether it's the verge on Darlington Road, a lay-by or a side road, stop where you are then leave it. Lasting damage is very uncommon if a car is pulled over quickly, and the fuel drain and flush-through that still come first sort it out.
Stories Heighington motorists hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing comes out when you top up — that tank just carries more of the same blend. Percentage is not how a diesel fuel system copes with petrol, whatever that guidance supposes.
Myth: a modern diesel copes with a bit of petrol. If anything, the reverse. At higher pressure, through more precise parts: that is how a newer diesel moves its fuel, and so the lubrication matters for more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that catches motorists. A petrol engine fed diesel generally won't run, and so the driver stops and the damage stops with them. Feed petrol to a diesel and it normally starts, idles and drives away like nothing happened — all the while its pump wears. Fine and running aren't the same thing.
Myth: "Add some two-stroke oil and drive the car home." It is an outdated fix for a separate issue. It doesn't put back what petrol has diluted, and the petrol is still inside your tank afterwards.
If the engine has been run, part of that petrol sits in your filter and the lines, not the tank — and the next start sends it right back through the pump. So the myth "drain the tank yourself and you're sorted" does not hold. It's also genuinely dangerous to drain petrol into a can at the roadside.
Why petrol in a diesel takes place so easily
Carelessness is seldom the cause, and no one means to do it. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slips 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 habit stops matching your car is the moment it happens. A new motor, a hire car or a courtesy car. Households running one of each, petrol and diesel. A well-known forecourt with the pumps in a different order. A hurried fill en route to the nearest station with a train to catch. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you at the forecourt for its first tank — that's when. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
Avoiding petrol in a diesel next time you fill up in Heighington
- A green handle for unleaded and black for diesel is normal in the UK — but not on every forecourt. Go by the label on the pump, not the colour.
- Check the filler flap. Plenty of motors state the fuel type inside the flap or on the cap. Look at it on the first fill in a motor you don't know.
- Label 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 intending to remember.
- It sounds daft and it works: on the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, so tuck your phone away and keep your mind on the petrol pump.
- Add-on devices are available for motors without one, and some diesels are built with a filler that will not take a petrol nozzle. Helpful — but a safety net only, never a reason to stop checking the label.
- Stop the moment you notice. Less petrol inside that tank makes a weaker mix. It doesn't change what to do next, which is still not to start it.
Already put petrol in a diesel around Heighington?
In that case, there is only a short order of things. Don't crank it, and do not turn the ignition on. Ask the staff to help you roll it away from the petrol pump if you are still on the forecourt, whether that's JET or somewhere else. Then call 0333 366 0103 and tell us what was put in, about how much, and if it has run.
Corrosion and deposits form the problem with AdBlue, where petrol brings lost lubrication. So if it was AdBlue, say so — and read its own Heighington page.
Heighington petrol in a diesel tasks: why one costs more than another
There's no fair single quote for this, because the four scenarios above are four different jobs. The scenario itself does most of the work of moving your cost. Two things come after that: the petrol that got in as a share of what your tank takes, then the place your car is in and whether our van can reach it safely.
Three queries come first, before quoting, rather than after — what got in, how much, has it run — and that is the reason. Those replies change a range into a straight figure.
About Heighington
Heighington is a village in County Durham, situated on the banks of a river at an elevation of around 140 metres. Heighington lies approximately 12 miles from the city of Durham and some 222 miles from London, with nearby villages including Redworth and School Aycliffe. Heighington has a population of around 1548 people, predominantly living in detached houses.
Fuel drain cover around Heighington and across Durham
Heighington waits in the DL postcode area, and our teams that answer petrol in diesel call-outs there work the places around it as well — Redworth, School Aycliffe and Houghton Bank among them. The car does not 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.
In Heighington and still at the pump?
Then, you couldn't be in a better position. Leave it switched off, then ring.