Should You Worry? Petrol in a Diesel Car in Popley
Unstarted? Then less worried than you probably are. Everyone around Popley begins with "have I ruined it?", and the honest answer is generally no: petrol left in that tank of a diesel remains harmless until priming, cranking or driving pulls it into your fuel system. Leave your motor off then phone Petrol in Diesel — that keeps it like that. The remainder of this page covers what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you again.
What petrol in a diesel does to the motor
Diesel does two jobs on its way through an engine. It burns, and before it burns it protects. What keeps the surfaces inside the high-pressure pump and the fuel injectors from wearing against each other is the diesel passing through them — they're designed to extremely fine clearances.
Badly at the first, not at all at the second: that is petrol. It is runnier than diesel and takes away the lubrication 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 reverse of what a diesel needs from its fuel. That is where the clattering comes from.
Seen together, they show what shape the issue takes. Not contact but circulation is what does the harm. Where the petrol is only inside that tank, it's a fault of fuel, nothing more. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with your fuel to the injectors downstream.
Petrol in a diesel in Popley: how bad is it? Four cases
Fuelled, and never started: no case is better. That petrol is in that tank and only the tank, and the task is a drain and a flush where the vehicle stands. This is the one situation that can only really happen at a forecourt, because anywhere else the vehicle has been driven to get there.
Ignition on, or started for a moment. With the fuel system primed, the fuel lines and filter already contain petrol that has come from that tank. Drain, flush, see to the fuel filter: still usually simple.
A few miles driven, and your pump has spent every one of them working on thinned fuel. The work is the tank, the fuel lines, the filter and fresh fuel through the whole circuit, and how hard your car was driven counts as much as how far. Driving the kids to St Bede's Catholic Primary School is one kind of trip. Very different a second time: a run to Winchester, under 25 miles away, or some distance on the M3, under 3 miles from Popley, where the motor kept running hard.
Driven on until it protested — knocking, smoke, a lumpy idle, a soft throttle. What you are hearing is the motor reporting fuel that no longer acts like diesel. Whether it is the verge on Tewkesbury Close, a lay-by or a side street, stop where you are and leave it. A car stopped quickly very seldom has permanent damage, as the fuel drain and the flush-through, which still go first, sort it out.
Myths Popley motorists hear about petrol in a diesel
Myth: topping up to full with diesel makes it fine. It does not. Topping up removes nothing; it gives you a bigger tank of the same mix. That guidance assumes a diesel fuel system handles petrol by percentage. It doesn't.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. Lubrication counts more on current diesels, not less, because their fuel passes 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. The motorist of a petrol motor fed diesel normally has no choice but to stop, because it will not run, and the harm stops with them. A diesel fed petrol normally starts, idles and drives away as if nothing has happened, whilst the pump wears. Being able to run is not proof of being fine.
An outdated workaround for a separate issue is behind this one. Myth: "Add some two-stroke oil and drive the car home." What petrol has thinned stays thinned, and the petrol stays in the tank regardless.
The next start draws petrol back round the pump from your lines and the filter, where some of that sits after your engine has been run. That's why a DIY tank drain doesn't sort it — a myth. It is also genuinely dangerous to drain petrol into a can by the kerbside.
How does petrol in a diesel happen?
Nobody does it on purpose, and it's rarely carelessness. One way only, because of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol car. That is how the forecourt makes it simple.
Habit and your car getting out of step is when it takes place. A new motor, a hire car or a courtesy car. A household with one petrol and one diesel on the driveway. A familiar forecourt with the pumps in a different order. Fuelling up in a hurry on the way to Basingstoke, with a train to catch. A new-to-you diesel Volkswagen Passat, its first fuelling, and a driver used to petrol: exactly when it takes place. With rain, a call coming in, or children to deal with, the hand just does what it always has.
Avoiding petrol in a diesel next time you fill up in Popley
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most generally do. Check the petrol pump's label; the colour is only a hint.
- Inspect the filler flap. Plenty of vehicles state the fuel inside the flap or on the cap. Look at it on the first fill in any vehicle you don't know.
- Good intentions do less than a sticker or a fob in a vivid colour on your diesel's key if a home has one of each. So label it.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump. It seems silly and it works.
- Mistakes like this are easy to make while your mind is on something else, so the phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to refuse a petrol nozzle, and aftermarket devices are available for the rest. Count it as a safety net, then keep checking the pump.
- Spotting it halfway? Stop there and then. A weaker mixture follows from less petrol inside the tank, yet the next stage remains the same: do not crank it.
Already put petrol in a diesel in Popley?
Then the order of things is short. Leave it unstarted, with your ignition switched off too. If you're still at the forecourt — Texaco or anywhere else — ask the staff to help you push the vehicle clear of the petrol pump. What was put in, roughly how much, and if it has run: tell us that when you phone 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a separate fault — Popley has a page all for it.
What makes one Popley petrol in a diesel job cost more than the next
There is no fair single price for this, since the four scenarios above are four different tasks. Chiefly, the cost moves with which situation you are in. Two things follow that: the petrol that went in as a proportion of what your tank holds, then the place the car is in and whether our van can get to it safely.
That is why our technicians ask three questions before costing instead of after: what was put in, how much, and whether it's run. A range turns into a straight figure once the answers are in.
About Popley and where it is
Popley is a suburban area in Hampshire, situated inland at an elevation of 84 metres, with terraced housing being the predominant type of accommodation. Popley lies approximately 18 miles from Winchester and 44 miles from London, placing it within the wider commuter belt of the South East region. Popley is surrounded by other residential areas, including Oakridge, Daneshill, and South View. Popley has a population of around 8645 residents, making it a moderately sized suburban community.
Fuel drain cover in Popley and across Hampshire
Our vans answering petrol in diesel call-outs around Popley, in the RG postcode area, also work the spots around it, Oakridge, Daneshill and South View included. The car doesn't need to move to us: our technicians drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the pump around Popley?
The best spot there is, then — that is where you are. Turned off it remains; then phone.