Bickleigh Down: Petrol in a Diesel Car? How Worried to Be
Unstarted? Then less anxious than you probably feel. Petrol sitting in a diesel tank does nothing to the engine till something pulls it through your fuel system — the ignition priming the pump, the starter, or the drive on its own. So the honest answer to the first query everyone around Bickleigh Down asks, "have I wrecked it?", is generally no. Petrol in Diesel is who to ring, with your engine kept off, so it stays that way. The remainder of this page sets out what petrol really does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you a second time.
The motor and petrol in a diesel: what goes on
Diesel does two jobs on its way through a motor. It protects first, and after that does it burn. Very fine clearances are built into your injectors and your high-pressure pump, and only the diesel running through stops their surfaces grinding together.
Petrol does the first task poorly and the second not at all. The clattering comes from petrol being made not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the lubrication the fuel system hinges on, and any pump running on such a mix is wearing itself.
Together, those make the shape of the problem plain. Contact doesn't do the damage — movement does. Where that petrol is only in the tank, it is a problem of fuel, nothing more. The beginning of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with the fuel to the fuel injectors beyond it.
Four situations our engineers see around Bickleigh Down: how serious is petrol in a diesel?
Fuelled, and not started: no case is better. Being at a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With the petrol held in that tank alone, it's emptied and purged right where it stands, and nothing more is needed.
The ignition turned on, or a short start. With the system primed, your lines and filter already hold petrol that has come from that tank. That's generally still an easy job — a drain, a flush, and your filter seen to.
A few miles driven, and the pump has spent each of them working on thinned fuel. How hard your car was driven counts as much as how far, and the work takes in the tank, the fuel lines, the fuel filter and fresh fuel through the whole system. Driving the kids to Bickleigh Down Church of England Primary School is one sort of trip. Very different again: a run to Plymouth, under 5 miles away, or some distance on the M5, under 50 miles from Bickleigh Down, where your engine never stopped labouring hard.
Knocking, an uneven idle, smoke, a throttle gone soft: driven till it complained. What you are hearing is the engine reporting fuel that no longer runs like diesel. Leave it where it has stopped: a lay-by, a side street, the verge on Bowers Park Drive. A car pulled over early very rarely has lasting damage, because the fuel drain and the flush, which still go first, deal with it.
Petrol in a diesel myths Bickleigh Down people hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Topping up removes nothing; it gives you a fuller tank of the same mix. The idea behind the advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. A newer diesel sends its fuel through finer components at higher pressure, which makes the lubrication matter more, not less.
One myth that catches people out: if it starts and drives, it must be unharmed. The motorist of a petrol motor fed diesel usually stops, since it will not run, and the harm stops there. A diesel fed petrol normally starts, ticks over and drives away as if nothing has happened, whilst the pump grinds. Running does not mean fine.
An outdated workaround for a different issue is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." It doesn't put back what petrol has diluted, and the petrol is still in your tank later.
Once the motor has been run, part of that petrol sits in your filter and your lines, not the tank — and your next start sends it right back through the pump. So the myth "drain the tank yourself and you are sorted" does not stand up. It is also genuinely risky to drain petrol into a can at the kerbside.
How does petrol in a diesel take place?
On purpose? Never. Through carelessness? Rarely, if ever. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle generally will not go into a petrol car at all. So the error runs one way.
It happens when habit and your car stop matching. Hire cars, courtesy cars, and motors that are new to you. One petrol and one diesel on the driveway of the same household. A well-known forecourt with the pumps in a different order. Racing for a train at Bere Ferrers and filling up en route. Years of petrol vehicles behind you, a diesel Volkswagen Golf in front of you at the forecourt for its first tank — that's when. Add rain, a phone call or a back seat full of kids, and the hand does what it has always done.
How to avoid petrol in a diesel at your next fill-up around Bickleigh Down
- The label is what counts, and so check the pump instead of the colour: in the UK unleaded handles are normally green and diesel black, yet not on each forecourt.
- Check your filler flap. Plenty of vehicles state the fuel inside the flap or on the cap. Look at it on your first fill in any car you do not know.
- A coloured fob or a sticker on your diesel's key does more than any amount of intending to remember, in a home with one of each.
- "Diesel", aloud, before you pick up the nozzle — every time a new or hired car gets its first tank. It seems silly. It does the trick.
- Whilst you're thinking about something else, this is an easy mistake to make — so put your phone away.
- Add-on devices exist for vehicles without one, and some diesels are built with a filler that won't take a petrol nozzle. Helpful — but a backstop only, never a reason to stop checking the label.
- Less petrol makes a weaker mix, and so stop the moment you notice — while remembering that your next stage is unchanged. It's still not to crank it.
Petrol already in a diesel around Bickleigh Down? Begin here
The order of things is short, then. Do not turn your ignition on, and do not crank it. The staff on the forecourt — whether at Tesco itself or wherever you filled up — will usually help push it clear of the pump if you ask. Next, 0333 366 0103. We will ask what was put in, roughly how much, and if it's been run.
Say so if it was AdBlue instead of petrol: it's a different issue, with its own page for Bickleigh Down, because AdBlue brings corrosion and deposits instead of lost lubrication.
Why one petrol in a diesel job in Bickleigh Down costs more than another
A fair single price doesn't exist here: four scenarios, four separate jobs. Chiefly, your cost moves with which situation you are in. Where the car is matters too, and whether a technician can safely reach it, after the ratio of petrol to what the tank takes.
Before any quote, not after, come three queries: your fuel that got in, the amount, and if it's run. That is why. Given those replies, you get a straight figure instead of a range.
About Bickleigh Down, briefly
Bickleigh Down is a suburban area situated inland in Devon, approximately 4.8 miles from Plymouth. Bickleigh Down sits at an elevation of around 140 metres, surrounded by nearby places such as Woolwell, Widewell, and Belliver. Bickleigh Down has a population of around 2993 people, predominantly residing in detached housing. Bickleigh Down is located in the South West region of England, about 188 miles from London.
Fuel drain cover in Bickleigh Down and across Devon
The teams answering petrol in diesel calls in Bickleigh Down, in the PL postcode area, equally work the locations near it, Woolwell, Widewell and Belliver among them. No need to bring the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots we drain.
In Bickleigh Down and still at the petrol pump?
No position is better: that is where you now are. Switched off it remains; then call.