Should You Worry? Petrol in a Diesel Car in Pattingham
Unstarted? Then less anxious than you likely are. Until your ignition primes the pump, the starter turns, or the car is driven, petrol in a diesel tank simply rests there and does nothing. Which means the honest reply to that first Pattingham question — "have I ruined it?" — usually no. Keep it that way: leave the motor off then call Petrol in Diesel. Keep reading for three things: the effect petrol has inside a diesel motor, the clues of how far it has got, and the way to make sure you never do it again.
What petrol in a diesel does to the engine
Two tasks fall to diesel on its journey through a motor. It protects to begin with, and only then does it burn. The high-pressure pump and the injectors are made to very fine clearances, and the diesel passing through them is what stops those surfaces from wearing down against each other.
Of those two tasks, petrol manages the first badly and the second not at all. The rattling comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips out the lubrication the system rests on, and any pump running on such a mix is wearing itself.
Together, those leave the shape of the issue clear. Not contact but circulation is what does the damage. Where the petrol is only inside your tank, it is a fault of fuel, nothing more. The beginning of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with your fuel to your injectors beyond it.
Pattingham, petrol in a diesel: four situations, from mild to serious
Filled but not once started — as good as it gets. At a forecourt, and genuinely only there, the petrol is still limited to the tank — since everywhere else the vehicle was driven to get to it. The task is draining and cleaning on the spot.
Ignition on, or started for a moment. The system has been primed, so petrol has left your tank and reached the fuel filter and the fuel lines. Still normally straightforward: drain, flush, and the fuel filter dealt with.
A couple of miles driven, and your pump has spent each of them running on weakened fuel. How hard your car was driven counts as much as how far, and the work takes in that tank, the lines, the fuel filter and clean fuel through the entire system. Driving the kids to St Chad's CofE (VC) First School is one kind of trip. Any miles on the M54, under 5 miles from Pattingham, means the engine has worked hard throughout, and a run to Wolverhampton, under 10 miles away, is a very different job as well.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. What you are hearing is the engine signalling fuel that no longer acts like diesel. Leave it wherever it stops: a lay-by, a side street, the verge on High Street. The drain and flush still come first, and they take care of it: when a car is pulled over early, long-term damage is very unusual.
Stories Pattingham 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." Topping up removes nothing; it gives you a fuller tank of the same mixture. The assumption behind the guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
Not so: a modern diesel copes with a bit of petrol. Rather, the opposite. A current diesel runs its fuel through more precise parts at higher pressure, which makes the protection count more, not less.
This is the one that fools motorists. Myth: "If it starts and drives, there's no harm done." The motorist of a petrol motor fed diesel normally stops, since it will not run, and the harm stops there. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile your pump wears. A running engine does not mean fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a different fault. What petrol has diluted stays weakened, and the petrol remains inside the tank regardless.
The next start draws petrol back round your pump out of your lines and the filter, where some of it sits after the motor has been run. That is why draining the tank yourself does not leave you sorted — a myth. On top of that, petrol cleared into a can by the road is genuinely risky.
Petrol in a diesel: how does it happen?
Nobody does it on purpose, and it's rarely carelessness. A diesel nozzle generally won't go into a petrol motor, but the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error straightforward, and just in that direction.
The moment habit stops matching the car is the moment it happens. Hire cars, courtesy cars, and motors that are new to you. One petrol and one diesel on the driveway of the same household. A familiar forecourt with the pumps in a different order. Rushing for a train at Albrighton and fuelling up en route. Exactly the moment it occurs: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. With rain, a call coming in, or children to deal with, the hand just does what it has always done.
Preventing petrol in a diesel next time you fill up in Pattingham
- Green for unleaded and black for diesel is normal in the UK — yet not on each forecourt. Go by the label on the pump, not the colour.
- The first fill in a new motor is the time to check your filler flap — inside it, or on the cap, many vehicles state the fuel they take.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of intending to remember, in a house with one of each.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump. It sounds daft and it works.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away and keep your mind on the petrol pump.
- Some diesels have a filler built to refuse a petrol nozzle, and devices you can add exist for motors without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop checking the petrol pump.
- Less petrol makes a thinner blend, and so stop as soon as you realise — while remembering that the next step is unchanged. It's still not to start it.
Put petrol in a diesel around Pattingham already?
In that case, there is just a short order of things. Leave it unstarted, with the ignition switched off as well. The staff on the forecourt — whether at Sainsbury's itself or wherever you filled up — will usually help roll it clear of the petrol pump if you ask. Next, 0333 366 0103. We will ask what went in, roughly how much, and if it's been run.
If it was AdBlue and not petrol, say so. That is a different issue — corrosion and deposits instead of lost lubrication — and it has its own page for Pattingham.
Pattingham petrol in a diesel tasks: why one costs more than another
Four different tasks sit behind the four situations above — which is why there's no honest single price. Mostly, your cost moves with which situation you are in. The share matters next, meaning how much of that tank is petrol, followed by the position of the vehicle and whether getting to it is safe for a van.
Ahead of any quote, not after, we ask three queries: your fuel that went in, the quantity, and if it has run. That is why. Given those replies, there is a straight figure instead of a range.
About Pattingham
Pattingham is a village in Staffordshire, situated approximately 5.7 miles southwest of Wolverhampton, and is characterized by its semi-detached housing stock. Pattingham sits in a relatively low-lying area, with an elevation of around 121 metres, and is surrounded by nearby places such as Westbeech and Nurton Hill. Pattingham has a population of around 1773 residents, and is located near the larger settlement of Great Moor. Pattingham is also some distance from London, at around 117.6 miles northwest of the capital.
Pattingham and Staffordshire: where our fuel drain cover reaches
Petrol in diesel calls in Pattingham — part of the WV postcode area — go to teams that likewise cover the places about it, Westbeech, Nurton Hill and Great Moor among them. The vehicle does not need to come to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
Pattingham: still at the petrol pump?
Nothing beats it: that is where you now are. Keep the vehicle turned off, then ring.