Petrol in a Diesel Car in Wheelton: How Worried Should You Be?
Less than you probably are, if it has not been started. Everyone in Wheelton begins with "have I ruined it?", and the fair answer is normally no: petrol left in that tank of a diesel remains harmless till priming, cranking or driving draws it into your fuel system. Keep it that way: leave the engine off then call Petrol in Diesel. What petrol really does to a diesel, how to judge how far it has travelled, and how to keep it from happening a second time: that's the remainder of this page.
Petrol in a diesel: what does it do to the motor?
On its way through an engine, diesel has two jobs. Before it burns, it lubricates — and then it combusts. Designed to extremely fine gaps, your injectors and your pump rely on your diesel flowing through them to keep their surfaces from wearing against one another.
The second job petrol doesn't do at all, and the first it does poorly. It is runnier than diesel and takes away the lubrication the fuel system hinges on, and so a pump running on a petrol mixture 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.
Put these together and the shape of the problem is clear. Not contact but circulation is what does the harm. Petrol in a tank is a fuel fault. Once your pump has been labouring on that petrol, a mechanical problem has begun: whatever is shed by a pump that is wearing down is carried downstream to the fuel injectors with the fuel.
Four scenarios our technicians see in Wheelton: how serious is petrol in a diesel?
Filled but never started — as good as it gets. Only that tank has petrol in it, so the task is draining your tank and flushing the system where the car sits. This scenario can only really take place on a forecourt: anywhere else, the car got there by being driven.
Ignition on, or started for a second. Petrol has come out of that tank and reached the filter and the lines, because the system has been primed. Usually nothing more than clearing, purging and sorting the filter, so still easy.
The pump now worked a few miles on diluted fuel — that is what driving the car does. How hard the vehicle was driven matters as much as how far, and this work takes in that tank, your lines, your filter and clean fuel through the entire circuit. Short trips, such as the school run to St Chad's Catholic Primary School, are one thing. Any distance on the M61, under a mile from Wheelton, means your engine has worked hard throughout, and a run to Preston, under 10 miles away, makes a very different task too.
Rattling, a ragged idle, smoke, a throttle gone soft: driven until it complained. The engine is telling you the fuel is no longer acting like diesel. Pull up where you are — on the verge on Victoria Street, at the kerb, down a side road — and do not move it again. The drain and flush-through still come first, and they deal with it: if a vehicle is pulled over soon, lasting damage is very unusual.
Myths Wheelton drivers hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing is removed by topping up — you are left with a fuller tank, still the same mixture. The assumption behind the advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
If anything, the reverse is true. Myth: "A modern diesel can cope with a bit of petrol." Smaller parts and higher pressure are how a current diesel runs its fuel, and that makes the protection count more, not less.
This is the one that catches drivers. Myth: "If it starts and drives, there is no harm done." A petrol engine fed diesel normally will not run, and so the motorist stops and the harm stops with them. A diesel fed petrol normally starts, ticks over and drives away as though nothing has happened, while the pump wears. Fine and running are not the same thing.
Myth: a two-stroke additive makes it safe to drive home. It was an old fix, supposed for another problem. That petrol is still inside the tank after that, and whatever it has weakened is not put back.
Myth: "Drain your tank yourself and you're sorted." After the motor has been run, some of that petrol is no longer inside the tank: it is in your filter and the lines, and it goes right back through the pump on your next start. Besides, petrol drained into a can by the road is truly hazardous.
Petrol in a diesel: how does it happen?
It's seldom carelessness, and no one does it on purpose. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol motor at all. The forecourt makes it easy, and the error runs one way.
When routine and your car stop matching, it occurs. Hire cars, courtesy cars, and cars that are new to you. Two vehicles on one drive, one petrol, one diesel. Your normal forecourt, its pumps now in a different order. A train to catch, and a rushed fill en route to Chorley. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: exactly when it happens. Throw in rain, a phone call or a back seat full of kids, and the hand repeats what it has always done.
Wheelton people: how to avoid petrol in a diesel next time
- The label is what matters, and so check the pump instead of the colour: in the UK unleaded handles are normally green and diesel black, yet not on every forecourt.
- In a motor you do not know, look inside the flap over the filler or at the cap before the first fill: many cars state the fuel type there.
- Mark the key. In a house 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 silly and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump.
- Whilst you're thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Some diesels have a filler designed to reject a petrol nozzle, and devices you can add are available for vehicles without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop checking the petrol pump.
- Stop as soon as you realise. Less petrol in your tank means a weaker mix. It doesn't change what to do next, which is still not to crank it.
Petrol already in a diesel in Wheelton? Start here
Then, there is just a short order of things. Leave it unstarted, with the ignition off too. The staff at the forecourt — whether at D.Mayor & Son Coal Merchants itself or wherever you filled up — will normally help push it clear of the pump if you ask. Next, 0333 366 0103. We will ask what went in, roughly how much, and if it has been run.
Corrosion and deposits are the trouble with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and see its own Wheelton page.
Why one petrol in a diesel job around Wheelton costs more than another
The four situations above are four different jobs, so no single quote for this would be honest. The situation itself does most of the work of moving the cost. Next it is the share — how much petrol went in against how much your tank holds — and then where the car is and whether our van can get to it safely.
What was put in, how much, and if it's run — three questions we ask before pricing, not after, for precisely that reason. A range turns into a straight figure when the answers are in.
About Wheelton and its setting
Wheelton is a village in Lancashire, situated on the riverside at an elevation of 117 metres, with terraced housing being the predominant type of accommodation. Wheelton lies approximately 6.4 miles from Preston and is surrounded by nearby places such as Lower Copthurst, Higher Copthurst, and Heapey. Wheelton has a population of around 724 residents and is located in the North West region of England, about 182.9 miles from London.
Across Lancashire and in Wheelton: fuel drain cover
Our teams answering petrol in diesel jobs in Wheelton, in the PR postcode area, equally work the spots near it, Lower Copthurst, Higher Copthurst and Heapey among them. 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.
In Wheelton and still at the petrol pump?
The best place there is, then — that is where you are. Leave the car switched off, then ring.