Hampton Vale: Petrol in a Diesel Car? How Worried to Be
Less than you probably are, provided it has not been started. Everyone in Hampton Vale begins with "have I ruined it?", and the fair answer is usually no: petrol left inside that tank of any diesel stays harmless until priming, cranking or driving pulls it into the fuel system. Leave the motor off and call Petrol in Diesel — that keeps it like that. Below, you will find what petrol really does inside a diesel, how far it may have gone, and how to stop it happening to you again.
Inside the engine: what petrol in a diesel really does
Diesel does two tasks on its way through an engine. It burns, and before it combusts it lubricates. The high-pressure pump and your injectors are built to extremely fine gaps, and your diesel passing through them is what stops those surfaces from grinding against each other.
Petrol handles the first job poorly and the second not at all. Being less viscous than diesel, petrol strips away the lubrication a fuel system needs, leaving a pump running on that mixture to wear itself. It is equally made to resist igniting under compression — the reverse of what a diesel needs — which is where you hear the clattering.
Together, those leave the shape of the problem clear. Contact does not do the harm — circulation does. Petrol in the tank is a fuel problem. The start of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with the fuel to your injectors downstream.
Four situations we see in Hampton Vale: how bad is petrol in a diesel?
Fuelled, and not started: no case is better. The petrol is in the tank and only your tank, and the task is a drain and a flush where your car sits. This is the one situation that can only truly take place on a forecourt, since anywhere else the vehicle has been driven to get there.
A moment's running, or just your ignition on. Petrol has come out of your tank and got to your filter and your lines, since the system has been bled. That is normally still an easy 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 running on weakened fuel. The work is the tank, the lines, your filter and clean fuel through the entire system, and how hard the vehicle was driven counts as much as how far. A school run to Hampton Vale Primary Academy is one thing. A run as far as Peterborough, under 3 miles away, is a very different job. So is any distance on the A1(M), under 3 miles from Hampton Vale, where your engine has been working hard throughout.
Driven on until it protested — clattering, smoke, an uneven idle, a dead throttle. That's your motor telling you its fuel has stopped behaving like diesel. Leave it where it has stopped: a lay-by, a side street, the verge on Westwater Crescent. A car pulled over quickly very seldom has permanent damage, because the drain and the flush, which still come first, take care of it.
Petrol in a diesel stories Hampton Vale drivers hear
Myth: topping up to full with diesel makes it fine. It does not. A fuller tank of the same mixture is all it gives, because topping up removes nothing. Percentage isn't how a diesel fuel system tolerates petrol, whatever that advice presumes.
Not so: a newer diesel copes with a bit of petrol. If anything, the reverse. Protection matters more on modern diesels, not less, since their fuel runs through more precise parts at higher pressure.
Myth: "If it starts and drives, there is no harm done." This is the one that fools motorists. Diesel in a petrol motor usually means a motor that will not run: the driver stops, and so does the harm. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile the pump wears. A running engine does not mean fine.
An outdated workaround for a separate problem is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." None of what petrol weakened gets put back by it — and later, your tank still contains the petrol.
Myth: "Drain your tank yourself and you're sorted." After the motor has run, some of the petrol is no longer in your tank: it is in the filter and your lines, and it goes straight back through your pump on the next start. And, a can of petrol drained by the roadside is genuinely risky.
Petrol in a diesel: how does it occur?
Nobody does it on purpose, and it is seldom carelessness. The forecourt makes it easy: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle generally will not go into a petrol car at all. So the mistake runs one way.
It occurs when routine and the car stop matching. Courtesy car, hire car, or a car that is new. Two vehicles on one driveway, one petrol, one diesel. A forecourt you know, but with its pumps laid out differently. A train to catch, and a rushed fill en route to Peterborough. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: precisely when it occurs. Throw in rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
Next time you fill up around Hampton Vale: avoiding petrol in a diesel
- Check the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on each forecourt. The label is what matters.
- Inspect your filler flap. Many vehicles state the fuel type inside the flap or on the cap. Look at it on the first fill in any car you don't know.
- One of each in the household? Label your key to the diesel — a coloured fob, a sticker — because intending to remember is not enough.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the petrol pump. It sounds silly and it does the trick.
- Whilst you are thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to block a petrol nozzle, and aftermarket devices exist for the remainder. Treat it as a safety net, and keep reading the pump.
- Stop as soon as you realise. Less petrol in that tank means a weaker mix. It does not change what to do next, which is still not to fire it up.
Already put petrol in a diesel around Hampton Vale?
Short and simple, then, is the order of things. Don't fire it up, and don't turn your ignition on. Ask the attendants to help you push it away from the petrol pump if you are still on the forecourt, whether that is Tesco or anywhere else. Then phone 0333 366 0103 and tell us what went in, roughly how much, and whether it has run.
If it was AdBlue rather than petrol, say so. That's a separate fault — corrosion and deposits and not lost lubrication — and it has its own page for Hampton Vale.
Why one petrol in a diesel job around Hampton Vale costs more than another
The four scenarios above are four different tasks, so no single quote for this would be fair. Which of them you're in is mostly what shifts the cost. Two things follow that: the petrol that went in as a proportion of what the tank takes, then the place the vehicle is in and whether a van can get to it safely.
That's why our engineers ask three questions before pricing rather than after: what was put in, how much, and whether it's run. Given those answers, you get a straight figure rather than a range.
About Hampton Vale
Hampton Vale is a suburban area situated on the outskirts of Peterborough in Cambridgeshire, with a lakeside setting and low elevation of around 3 metres. Hampton Vale is characterised by its predominantly detached housing stock and is located near other residential areas such as Hampton Hargate and Orton Malborne. Hampton Vale has a population of approximately 7288 residents and is within easy reach of Peterborough city centre, being just 2.9 miles away. Hampton Vale is also relatively close to the regional transport networks, with London around 71 miles to the south.
Across Cambridgeshire and around Hampton Vale: fuel drain cover
Hampton Vale sits in the PE postcode area, and our vans that answer petrol in diesel jobs there work the spots around it as well — Hampton Hargate, Orton Malborne and Orton Goldhay among them. A forecourt, a supermarket car park, a lay-by or your own drive are all places our engineers drain, and the car does not need to move to us.
In Hampton Vale and still at the petrol pump?
Nothing beats it: that is where you are. Turned off it stays; then call.