Petrol in a Diesel Car in Tilkey: How Worried Should You Be?
Far less than you likely are, provided it hasn't been started. Everyone in Tilkey begins with "have I ruined it?", and the honest answer is generally no: petrol resting inside your tank of any diesel stays harmless till priming, cranking or driving pulls it into your fuel system. Keep it like that: leave your motor off then phone Petrol in Diesel. What petrol really does to a diesel, how to gauge how far it's travelled, and how to stop it from happening again: that's the remainder of this page.
Your engine and petrol in a diesel: what goes on
Two tasks fall to diesel on its route round a motor. Lubricating comes before burning; it does both. Very fine tolerances are built into the injectors and your high-pressure pump, and only the diesel running through stops their surfaces grinding together.
Badly at the first, not at all at the second: that is petrol. It is runnier than diesel and strips away the protection the system hinges on, so a pump running on a petrol blend is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the knocking comes from.
Put these together and the shape of the issue is clear. Contact does not do the harm — circulation does. Where the petrol is only inside your tank, it's a fault of fuel, nothing more. Once your pump has been running on that petrol, a mechanical fault has begun: anything shed by a pump that's wearing down is carried onward to the injectors with your fuel.
How serious is petrol in a diesel? Four situations our technicians see around Tilkey
Filled but not once started — the best it gets. The petrol is in that tank and just the tank, and the job is a drain and a flush where the vehicle sits. This is the one situation that can only truly take place on a forecourt, because anywhere else the vehicle has been driven to get there.
A brief spell of running, or just your ignition on. The system has been primed, so petrol has left your tank and reached the fuel filter and the fuel lines. That is normally still an easy job — a drain, a flush, and your filter dealt with.
Those few miles driven were your pump running on fuel diluted by petrol throughout. The work is your tank, your lines, the fuel filter and fresh fuel through the whole system, and how hard your car was driven counts as much as how far. Driving the children to St Peter's Church of England Voluntary Controlled Primary School, Coggeshall is one sort of trip. Very different a second time: a trip to Colchester, under 10 miles away, or any miles on the M11, under 25 miles from Tilkey, where the engine never stopped working hard.
Driven on till it complained — knocking, smoke, a ragged idle, a dead throttle. The fuel isn't acting like diesel any more, and your motor is telling you. Pull up wherever you are — the verge on Westfield Drive, a lay-by, a side street — and leave it where it is. What goes first is still the fuel drain and flush-through, and that sorts it out, with long-term damage very uncommon when a vehicle is stopped early.
Myths Tilkey people 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." Nothing is removed by topping up — you're left with a bigger tank, still the same mixture. Percentage isn't how a diesel fuel system copes with petrol, whatever that guidance supposes.
Not so: a current diesel copes with a bit of petrol. If anything, the reverse. Lubrication matters more on newer diesels, not less, since their fuel runs through more precise components at higher pressure.
The myth that catches motorists out: if it starts and drives, it must be unharmed. A petrol motor fed diesel generally will not run, so the motorist stops and the damage stops with them. Feed petrol to a diesel and it usually fires up, idles and drives away like nothing has happened — all while its pump wears. Running isn't the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct fault. None of what petrol weakened gets put back by it — and later, your tank still holds the petrol.
Once your engine has run, part of that petrol is in the fuel filter and the fuel lines, not the tank — and your next start sends it right back through the pump. So the myth "drain your tank yourself and you are sorted" doesn't stand up. It is also truly risky to drain petrol into a can at the kerbside.
Petrol in a diesel: how does it take place?
No one does it on purpose, and it's seldom carelessness. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle mostly won't go into a petrol car at all. So the mistake runs one way.
The moment habit stops matching the car is the moment it takes place. Any vehicle that is new to you — hired, on loan as a courtesy car, or brand new. Two vehicles on one drive, one petrol, one diesel. The pumps in a different order on a familiar forecourt. Racing for a train at Kelvedon and fuelling up en route. Years of petrol vehicles behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that's when. The hand does what it has always done when you add rain, a phone call or a back seat full of children.
Tilkey motorists: how to avoid petrol in a diesel next time
- A green handle for unleaded and black for diesel is normal in the UK — yet not on each forecourt. Go by the label on the petrol pump, not the colour.
- Check your filler flap. Many cars state the fuel type inside the flap or on the cap. Look at it on your first fill in a vehicle you don't know.
- Label the key. In a home 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 pump the first time you fuel a hired or new car, say "diesel" aloud. Silly, yes, yet it works.
- Whilst you are thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Some diesels have a filler designed to refuse a petrol nozzle, and devices you can add are available for vehicles without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the pump.
- Noticing it mid-fill? Stop there and then. A thinner blend follows from less petrol in your tank, yet your next stage stays the same: do not fire it up.
Already put petrol in a diesel in Tilkey?
The order of things is short, then. Don't switch your ignition on, and don't fire it up. The attendants on the forecourt — whether at BP itself or wherever you filled up — will normally help push it away from the petrol pump if you ask. Next, 0333 366 0103. We'll ask what got in, about how much, and if it's been run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a separate fault — Tilkey has a page just for it.
Tilkey petrol in a diesel tasks: why one costs more than another
Four separate jobs lie behind the four scenarios above — which is why there's no honest single price. What shifts the cost is chiefly which of them you are in. Where the vehicle is matters too, and whether our van can safely reach it, after the ratio of petrol to what that tank holds.
Ahead of any quote, not after, come three queries: your fuel that got in, its volume, and if it has run. That is why. A range becomes a straight figure when those answers are in.
About Tilkey itself
Tilkey is a suburban area located on the riverside in Essex, with an elevation of 34 metres. Tilkey sits near the city of Colchester, approximately 9.2 miles away, and is also close to nearby places such as Coggeshall and Surrex. Tilkey has a population of around 3431 people and predominantly consists of semi-detached housing. Tilkey is situated in the Eastern region of England, about 43.2 miles from London.
Across Essex and in Tilkey: fuel drain cover
Tilkey rests in the CO postcode area, and the vans that answer petrol in diesel jobs there work the places around it as well — Coggeshall, Coggeshall Hamlet and Surrex among them. No need to move the car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots where we work.
In Tilkey and still at the pump?
The best position there is, then — that is where you are. Switched off it remains; then ring.