How Worried Should You Be? Petrol in a Diesel Car in Netherexe
Probably less than you are now — provided no one has started the car. "Have I wrecked it?" is the first question anyone in Netherexe asks, and the truthful answer is generally no, because petrol left in a diesel tank hurts nothing until it is drawn through the system — by ignition priming, by your starter, or by driving. Leave your motor off and phone Petrol in Diesel — that is how you keep it like that. What petrol really does to a diesel, how to judge how far it has travelled, and how to stop it from happening again: that's the rest of this page.
Petrol in a diesel: what does it do to the motor?
Two jobs fall to diesel on its route through a motor. It protects to begin with, and after that does it burn. Designed to very fine clearances, the injectors and the pump depend on your diesel moving through them to stop their surfaces wearing against one another.
Of these two tasks, petrol handles the first badly and the second never. A pump working on a petrol mixture is wearing itself out, because petrol is runnier than diesel and strips out the protection the fuel system depends on. Petrol is also made 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 clear. It is movement that does the damage, not contact. Where that petrol is only in that tank, it is a fault of fuel, nothing more. Whatever a worn pump sheds travels on, borne by the fuel, into the injectors downstream, which is why a pump that has been working on the petrol is where a mechanical issue starts.
Four situations our technicians see in Netherexe: how bad is petrol in a diesel?
The best case there can be: filled up, never started. Being at a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With that petrol held inside your tank alone, it is drained and cleaned on the spot, and nothing more is needed.
The ignition switched on, or a short start. Once primed, your system has pulled petrol from the tank as far as the fuel filter and your lines. Drain, flush, see to the filter: still usually easy.
Those few miles driven were the pump working on fuel thinned by petrol the whole way. The work is your tank, the lines, your filter and fresh fuel through the whole circuit, and how hard the vehicle was driven matters as much as how far. Driving the kids to Brampford Speke Church of England Primary School is one sort of trip. Very different once more: a trip to Exeter, under 5 miles away, or any distance on the M5, under 3 miles from Netherexe, where the engine kept running hard.
Driven till it protested. Clattering, an uneven idle, smoke, a throttle that has gone soft. What you are hearing is your engine reporting fuel that no longer runs like diesel. Stop where you are — on the verge on Dunsford Hill, at the kerb, down a side road — and do not move it. A car pulled over early very rarely has long-term damage, since the drain and the flush-through, which still come first, take care of it.
Netherexe people and the petrol in a diesel stories they hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing comes out when you top up — that tank simply holds more of the same mixture. That guidance presumes a diesel fuel system handles petrol by percentage. It does not.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. Lubrication matters more on modern diesels, not less, because their fuel runs through finer components at higher pressure.
"It starts, it drives, and so there is no harm" — the myth that trips up most motorists than any other. A petrol motor fed diesel generally will not run, and so the motorist stops and the harm stops with them. A diesel fed petrol normally starts, idles and drives away as though nothing has happened, while your pump wears. Running doesn't mean fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a separate issue. None of what petrol weakened is put back by it — and later, your tank still holds the petrol.
If the engine has been run, part of the petrol sits in your filter and your lines, not that tank — and the next start sends it straight back through your pump. So the myth "drain that tank yourself and you're sorted" does not hold. Besides, petrol cleared into a can by the road is genuinely risky.
Petrol in a diesel: how does it take place?
On purpose? Never. Through carelessness? Rarely, if ever. The forecourt makes it simple: the petrol nozzle is the slimmer of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle mostly will not go into a petrol vehicle at all. So the mistake runs one way.
Routine and the car getting out of step is when it occurs. Courtesy car, hire car, or a vehicle that's new. Households running one of each, petrol and diesel. Your usual forecourt, its pumps suddenly in a different order. A rushed fill on the way to Newton St Cyres with a train to catch. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is exactly the moment it takes place. The hand repeats what it has always done once you add rain, a phone call or a back seat full of kids.
Next time you fill up around Netherexe: preventing petrol in a diesel
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Check the petrol pump's label; the colour is just a clue.
- The first fill in a strange vehicle is the time to check your filler flap — inside it, or on the cap, many vehicles state which fuel they take.
- Label 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 intending to remember.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the pump. It sounds silly and it works.
- While you're thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Some diesels come with a filler designed to block 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 petrol pump.
- Less petrol means a weaker mixture, and so stop the moment you realise — though remembering that your next stage is unchanged. It's still not to crank it.
Put petrol in a diesel in Netherexe already?
Then the order of things is brief. Do not start it, and do not turn your ignition on. If you are still on the forecourt — Esso or anywhere else — ask the staff to help you roll the vehicle away from the pump. What was put in, roughly how much, and whether it has run: tell us that when you phone 0333 366 0103.
Corrosion and deposits are the problem with AdBlue, whereas petrol brings lost lubrication. So if it was AdBlue, say so — and read its own Netherexe page.
What makes one Netherexe petrol in a diesel job cost more than the next
Four separate tasks lie behind the four situations above — which is why there is no honest single price. Which of them you're in is chiefly what shifts your cost. Where your car is counts too, and whether a van can safely reach it, after the share of petrol to what that tank holds.
What went in, how much, and if it's run — three queries we ask before costing, not after, for precisely that reason. The answers turn a range into a straight figure.
About Netherexe itself
Netherexe is a small hamlet situated on the riverside in Devon, with a low elevation of around 26 metres. Netherexe lies close to the city of Exeter, approximately 4.7 miles away, and is near other local places such as Rewe and Brampford Speke. Netherexe has a population of around 551 people, predominantly living in detached houses.
Fuel drain cover across Devon, Netherexe included
Netherexe rests in the EX postcode area, and the vans that answer petrol in diesel jobs there work the places around it as well — Rewe, Berrysbridge and Brampford Speke among them. No need to bring your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots where we work.
Still at the petrol pump in Netherexe?
In that case, you couldn't be in a better place. Leave the vehicle switched off, and ring.