Pantyffynnon: Petrol in a Diesel Car? How Worried to Be
Far less than you probably are, provided it has not been started. Petrol sitting in a diesel tank does nothing to your engine till something draws it through the fuel system — the ignition priming your pump, your starter, or the drive itself. So the truthful answer to the first question anyone around Pantyffynnon asks, "have I wrecked it?", is normally no. Petrol in Diesel is who to ring, with your engine left off, so it remains that way. Read on for three things: the effect petrol has inside a diesel motor, the clues of how far it has got, and ways to make sure you don't do it again.
Petrol in a diesel: what does it do to your engine?
Diesel does two tasks on its way through a motor. Before it burns, it protects — and then it burns. Made to very fine clearances, the fuel injectors and your pump rely on your diesel flowing through them to keep their surfaces from wearing against one another.
Of these two jobs, petrol manages the first poorly and the second not at all. A pump working on a petrol blend is wearing itself out, because petrol is runnier than diesel and takes away the lubrication the fuel system depends on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that's where the clattering starts.
Put these together and the shape of the trouble is plain. Not contact but movement is what causes the harm. All a tank with petrol in it amounts to is a fuel fault. A pump that has been working on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with the fuel to the injectors downstream.
How bad is petrol in a diesel? Four situations we see in Pantyffynnon
The best case there can be: filled up, never started. Only the tank has petrol in it, so the job is clearing your tank and cleaning the fuel system where the car sits. This scenario can only truly take place at a forecourt: anywhere else, the vehicle got there by being driven.
The ignition switched on, or a short start. With the fuel system primed, the fuel lines and filter now hold petrol that has come from that tank. Drain, flush, see to the filter: still normally straightforward.
The pump now worked a couple of miles on diluted fuel — that's what driving the vehicle meant. How hard your car was driven counts as much as how far, and the work covers your tank, your lines, the fuel filter and fresh fuel through the whole system. Driving the children to the local primary school is one kind of trip. Any miles on the M4, under 10 miles from Pantyffynnon, means the motor working hard throughout, and a run to Swansea, under 15 miles away, makes a very different task as well.
It protested, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone lumpy. What you are hearing is the engine signalling fuel that no longer acts like diesel. Leave it wherever it stops: a lay-by, a quiet street, the verge on Church Road. Long-term damage is very rare when a car is pulled over early, and the drain and flush that still go first sort it out.
What Pantyffynnon motorists get told about petrol in a diesel — and the myths in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Nothing is removed by topping up — you're left with a bigger tank, still the same mix. Percentage is not how a diesel fuel system tolerates petrol, however much that advice supposes.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. Lubrication matters more on newer diesels, not less, since their fuel passes through finer parts at higher pressure.
One myth that catches people out: if it starts and drives, it must be unharmed. Any petrol motor fed diesel generally won't run, so the motorist stops and the harm stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile your pump wears. Being able to run isn't the same as being fine.
An old workaround for a distinct issue lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." None of what petrol thinned gets put back by it — and afterwards, your tank still contains the petrol.
"Drain it yourself and you are sorted" — a myth, because after it has been running some petrol lies in the fuel filter and lines, ready to go straight back through the pump on the next start. On top of that, petrol cleared into a can by the road is truly risky.
Petrol in a diesel: how does it occur?
It's seldom carelessness, and no one does it on purpose. 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, while a diesel nozzle generally will not go into a petrol motor at all. So the error runs one way.
The moment routine stops matching your car is the moment it occurs. Courtesy car, hire car, or a motor that's brand new. Households running one of each, petrol and diesel. A familiar forecourt with the pumps in a different order. Filling up in a rush en route to Neath, with a train to catch. The first fill-up in a diesel Volkswagen Passat after years of driving petrol is exactly the moment it takes place. Add a back seat full of kids, a phone call or rain, and the hand takes over.
How to avoid petrol in a diesel on your next fill-up around Pantyffynnon
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most generally do. Check the petrol pump's label; the colour is only a clue.
- Plenty of vehicles state the fuel type inside the filler flap or on the cap, and so check it on the first fill in any vehicle you do not know.
- A coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember, for a home with one of each.
- It seems silly and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Put your phone away. This is an easy mistake to make whilst you're thinking about something else.
- Add-on devices exist for vehicles without one, and some diesels are built with a filler that will not accept a petrol nozzle. Useful — but a backstop only, never a reason to stop checking the label.
- The moment you realise, stop: less petrol in your tank means a weaker blend. What to do next does not change, though — still don't crank it.
Pantyffynnon: already put petrol in a diesel?
Then the order of things is short. Leave it unstarted, with the ignition off as well. Ask the attendants to help you push it away from the pump if you are still at the forecourt, whether that is Asda or anywhere else. What was put in, about how much, and whether it has run: tell us that when you ring 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a separate fault — Pantyffynnon has a page just for it.
Why one petrol in a diesel job around Pantyffynnon costs more than another
Four different jobs sit behind the four scenarios above — which is why there's no fair single quote. Mostly, the cost moves with which one you are in. Two things come after that: the petrol that got in as a share of what the tank holds, then the place the car is in and whether a van can reach it safely.
Ahead of any quote, not after, come three questions: the fuel that was put in, its amount, and whether it's run. That is why. A range becomes a straight figure when those replies are in.
About Pantyffynnon and its setting
Pantyffynnon is a suburban area in Neath Port Talbot, situated on the riverside at an elevation of 89 metres. Pantyffynnon lies near the communities of Godrer-graig, Ystalyfera, and Cilmaengwyn, and is approximately 11 miles from Swansea. Pantyffynnon has a population of around 1270 people, predominantly living in semi-detached housing. Pantyffynnon is also relatively distant from London, at a distance of 158 miles.
Across Neath Port Talbot and around Pantyffynnon: fuel drain cover
Petrol in diesel jobs in Pantyffynnon — part of the SA postcode area — go to teams that likewise cover the locations round it, Godrer-graig, Ystalyfera and Cilmaengwyn included. The vehicle does not need to come to us: our engineers drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
In Pantyffynnon and still at the petrol pump?
In that case, you could not be in a better place. Leave the vehicle switched off, then ring.