How Worried Should You Be? Petrol in a Diesel Car in Erlestoke
Provided it has not been started, worry less than you probably 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 makes the honest reply to the first Erlestoke query — "have I ruined it?" — usually no. Keep it that way: leave your motor off then phone Petrol in Diesel. Read on for three things: the effect petrol has inside a diesel engine, the clues of how far it has got, and the way to make sure you don't do it again.
The motor and petrol in a diesel: what goes on
On its way through a motor, diesel has two tasks. It ignites, and before it ignites it lubricates. The high-pressure fuel pump and the injectors are made to very fine gaps, and the diesel passing through them is what keeps those surfaces from wearing down against each other.
Of these two jobs, petrol manages the first poorly and the second never. A pump working on a petrol mix is wearing itself out, since petrol is runnier than diesel and strips out the protection the fuel system depends on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that is where any knocking comes.
Put those together and the shape of the trouble is clear. Not contact but movement is what does the damage. All a tank with petrol in it amounts to is a fuel issue. The start of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds moves on with the fuel to the fuel injectors beyond it.
Petrol in a diesel around Erlestoke: how bad is it? Four cases
Fuelled up, never started. The best case there can be. Just your tank has petrol in it, so the job is emptying the tank and cleaning the fuel system where the vehicle stands. This situation can only truly happen on a forecourt: anywhere else, the car got there by being driven.
A brief spell of running, or just the ignition on. Your system has been bled, so petrol has left the tank and reached your filter and the lines. Drain, flush, see to the filter: still usually easy.
Your pump has worked a few miles on thinned fuel — that is what driving the vehicle meant. The work is that tank, the lines, your filter and fresh fuel through the entire system, and how hard the car was driven matters as much as how far. Short trips, such as the school run to The Holy Trinity Church of England Primary Academy, are one thing. Driving as far as Bath, under 15 miles away, makes a very different job — as does any mileage on the M4, under 25 miles from Erlestoke, with the engine running hard all the way.
Clattering, an uneven idle, smoke, a throttle gone soft: driven till it complained. The motor is telling you the fuel is no longer behaving like diesel. Whether it's the verge on High Street, a lay-by or a side street, stop there then leave it. A vehicle stopped soon very seldom has permanent damage, because the drain and the flush-through, which still come first, take care of it.
Stories Erlestoke people hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing is removed by topping up — you are left with a fuller tank, still the same mixture. Percentage is not how a diesel fuel system tolerates petrol, however much that guidance supposes.
If anything, the opposite holds. Myth: "A modern diesel can cope with a bit of petrol." A current diesel runs its fuel through more precise parts at higher pressure, which makes the lubrication count more, not less.
The myth that catches motorists off guard: if it starts and drives, it must be unharmed. The driver of a petrol engine fed diesel usually has no choice but to stop, since it will not run, and the harm stops with them. A diesel fed petrol usually starts, idles and drives away as though nothing has happened, whilst the pump grinds. Fine and running aren't the same at all.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a different fault. It doesn't put back what petrol has weakened, and that petrol is still inside the tank later.
If the motor has been run, part of that petrol is in the filter and your lines, not the tank — and the next start pulls it straight back through your pump. So the myth "drain the tank yourself and you are sorted" does not stand up. Also, a can of petrol drained by the kerbside is truly dangerous.
How does petrol in a diesel take place?
Carelessness is seldom the cause, and no one means to do it. A diesel nozzle generally will not go into a petrol car, but the smaller petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error simple, and just in one direction.
The moment routine stops matching your car is the moment it happens. A vehicle that's new to you — a hire car, on loan as a courtesy car, or brand new. Two motors on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A rushed fill on the way to Westbury with a train to catch. Precisely the moment it occurs: after years of driving petrol, someone fills a diesel Renault Clio for the first time. Add a back seat full of kids, a phone call or rain, and habit takes over.
Next time you fill up around Erlestoke: preventing petrol in a diesel
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Read the pump's label; the colour is just a hint.
- Check your filler flap. Plenty of motors state the fuel inside the flap or on the cap. Look at it on your first fill in a car you do not know.
- Mark the key. In a house with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember.
- Before the nozzle leaves the petrol pump the first time you fuel a hired or new vehicle, say "diesel" out loud. Silly, yes, yet it works.
- While you're thinking about something else, this is an easy mistake to make — so put your phone away.
- Some diesels have a filler designed to refuse a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop checking the pump.
- As soon as you notice, stop: less petrol in your tank means a weaker mix. What to do next doesn't change, though — still do not crank it.
Petrol already in a diesel in Erlestoke? Start here
Then the order of things is brief. Do not start it, and do not switch your ignition on. Still at the forecourt, at Murco or anywhere else? Ask the staff to help you push the car clear of the petrol pump. What got in, roughly how much, and if it has run: tell us those when you ring 0333 366 0103.
If it was AdBlue and not petrol, say so. That's a separate problem — corrosion and deposits rather than lost protection — and it has its own page for Erlestoke.
One petrol in a diesel task around Erlestoke costs more than another. Why?
The four situations above are four separate tasks, so no single price for this would be fair. What shifts the cost is chiefly which of them you're in. The share matters next, meaning how much of the tank is petrol, followed by the location of the car and whether reaching it is safe for our van.
That is why our technicians ask three queries before quoting instead of after: what went in, how much, and whether it's run. The answers change a range into a straight figure.
About Erlestoke itself
Erlestoke is a small village in Wiltshire, situated inland at an elevation of around 85 metres, with detached housing being the predominant type of accommodation. Erlestoke lies near the villages of Coulston, Townsend, and Great Cheverell, and is approximately 14.9 miles from the city of Bath. Erlestoke has a population of around 519 people and is located about 84.4 miles west of London. Erlestoke remains a quiet rural community with a strong sense of local identity.
Fuel drain cover around Erlestoke and across Wiltshire
Petrol in diesel calls in Erlestoke — part of the SN postcode area — go to teams that likewise cover the spots around it, Coulston, Townsend and Great Cheverell among them. You need not bring the car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots we drain.
Still at the pump in Erlestoke?
Then, you could not be in a better spot. Switched off it remains; then call.