Petrol in a Diesel Car in Park Place: How Worried Should You Be?
Far less than you likely are, provided it has not been started. Everyone around Park Place starts with "have I wrecked it?", and the fair answer is usually no: petrol resting inside your tank of any diesel remains harmless until priming, cranking or driving draws it into the fuel system. Petrol in Diesel is who to call, with your motor left off, so it stays that way. The rest of this page explains what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you a second time.
Your engine and petrol in a diesel: what happens
Diesel has two jobs on its way through a motor. It burns, and before it combusts it protects. Very fine clearances are built into your injectors and the high-pressure fuel pump, and only your diesel running through stops their surfaces grinding together.
Of these two jobs, petrol handles the first poorly and the second not at all. It is runnier than diesel and strips away the protection the fuel system hinges on, and so a pump running on a petrol blend is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That's where the knocking comes from.
Together, those make the shape of the issue plain. It is circulation that does the harm, not contact. Any tank with petrol in it is a fuel fault. A pump that has been working on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with the fuel to your injectors further on.
Park Place, petrol in a diesel: four situations, from mild to significant
Fuelled but not once started — the best it gets. The petrol is in the tank and just that tank, and the task is a drain and a flush where your car stands. This is the one situation that can only really happen on a forecourt, because anywhere else the vehicle has been driven to get there.
Ignition on, or started for a moment. The system has been bled, and so petrol has left the tank and got to the filter and your lines. That's generally still a simple job — a drain, a flush, and your filter seen to.
The pump has spent a few miles on weakened fuel — that's what driving the vehicle meant. How hard the car was driven counts as much as how far, and the work covers your tank, the lines, the filter and fresh fuel through the whole system. On the school run to St Mary's and St Joseph's Roman Catholic Primary School Blackburn, the mileage is short. Driving as far as Preston, under 10 miles away, makes a very different job — as does any distance on the M65, under 3 miles from Park Place, with your engine running hard all the way.
Clattering, a lumpy idle, smoke, a throttle gone soft: driven till it complained. The fuel is not behaving like diesel any more, and the motor is saying so. Leave it where it has stopped: a lay-by, a side street, the verge on Bargee Close. What goes first is still the fuel drain and flush, and that deals with it, with lasting damage very unusual when a vehicle is pulled over soon.
What Park Place drivers get told about petrol in a diesel — and the myths in it
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. A fuller tank of the same mix is all you get, since topping up takes out nothing. The assumption behind that advice — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through smaller parts: that's how a current diesel handles its fuel, and so the lubrication matters more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that catches motorists. A petrol motor fed diesel generally won't run, so the motorist stops and the harm stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump wears. Being able to run is not the same as being fine.
Myth: a two-stroke additive lets you to drive home. It was an old workaround, supposed for another problem. It does not put back what petrol has thinned, and the petrol is still inside your tank later on.
Myth: "Drain your tank yourself and you are sorted." After your engine has run, some of that petrol is no longer inside the tank: it's in your filter and the fuel lines, and it goes right back through the pump at your next start. It's also truly risky to drain petrol into a can at the roadside.
How does petrol in a diesel happen?
Nobody 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 car at all. The forecourt makes it easy, and the error runs one way.
When routine and your car stop matching, it occurs. A car that is new to you — hired, on loan as a courtesy car, or brand new. A household with one petrol and one diesel on the driveway. Your ordinary forecourt, its pumps now in a different order. A hurried fill on the way to Blackburn with a train to catch. Precisely the moment it happens: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Your hand does what it has always done when you add rain, a phone call or a back seat full of kids.
Park Place drivers: how to avoid petrol in a diesel next time
- The label is what counts, and so read the petrol pump instead of the colour: in the UK unleaded handles are normally green and diesel black, but not on each forecourt.
- In a motor you do not know, look inside the flap over the filler or at the cap before your first fill: plenty of motors state the fuel there.
- Good intentions do less than a sticker or a fob in a bright colour on the diesel's key if a household has one of each. So label it.
- Before the nozzle leaves the petrol pump the first time you fill a hired or new vehicle, say "diesel" out loud. Silly, yes, yet it does the trick.
- Mistakes like this are easy to make whilst your mind is on something else, and so your phone goes away.
- Some diesels come with a filler built to refuse a petrol nozzle, and devices you can add exist for cars without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump.
- Stop as soon as you realise. Less petrol inside that tank makes a thinner blend. It doesn't change what to do next, which is still not to fire it up.
Petrol already in a diesel in Park Place? Start here
Short and simple, then, is the order of things. Leave it unstarted, with your ignition switched off as well. Ask the attendants to help you roll it away from the pump if you are still on the forecourt, whether that's Asda or somewhere else. What went in, about how much, and if it's run: tell us that when you call 0333 366 0103.
Corrosion and deposits are the issue with AdBlue, whereas petrol means lost protection. So if it was AdBlue, say so — and read its own Park Place page.
One petrol in a diesel job in Park Place costs more than another. Why?
Four different tasks lie behind the four situations above — which is why there is no honest single quote. Which of them you're in is mostly what moves your cost. Two things follow that: the petrol that got in as a proportion of what that tank holds, then the spot your car is in and whether a van can get to 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 answers are what change a range into one firm number.
About Park Place and where it is
Park Place is a suburban area in Lancashire, situated on the riverside with a mix of terraced housing and other residential properties. Park Place sits at an elevation of 126 metres, approximately 9 miles from Preston and 183 miles from London. Park Place is close to nearby places such as Lower Audley, Grimshaw Park, and Towns Moor, and has a population of around 6396 residents.
Park Place and Lancashire: where our fuel drain cover reaches
Petrol in diesel jobs around Park Place — part of the BB postcode area — go to vans that also cover the spots round it, Lower Audley, Grimshaw Park and Towns Moor among them. A forecourt, a supermarket car park, a lay-by or your own drive are all places our technicians work, and your vehicle does not need to come to us.
At the petrol pump in Park Place, right now?
No position is better: that is where you now are. Keep it off. Call.