Little End: Petrol in a Diesel Car? How Worried to Be
Less than you probably are, if it hasn't been started. Petrol resting in a diesel tank does nothing to the engine until something pulls it through the fuel system — the ignition priming your pump, the starter, or driving on its own. So the honest answer to the first query everyone in Little End asks, "have I wrecked it?", is generally no. To leave it that way, ring Petrol in Diesel and leave the motor alone. What petrol actually does to a diesel, how to gauge how far it has travelled, and how to keep it from happening a second time: that is the rest of this page.
Petrol in a diesel: what does it do to the motor?
Diesel does two jobs on its way through an engine. Before it ignites, it lubricates — then it ignites. What keeps the surfaces inside the high-pressure fuel pump and the fuel injectors from wearing against each other is your diesel flowing through them — they are built to very fine tolerances.
Of those two jobs, petrol manages the first poorly and the second not at all. Being less viscous than diesel, petrol strips away the protection a fuel system needs, so a pump on that mixture to wear itself. It's also made to resist igniting under compression — the opposite of what a diesel needs — which is where you get the rattling.
Put these together and the shape of the problem is plain. Contact doesn't do the damage — circulation does. A tank with petrol in it is a fuel fault. Once your pump has been labouring on that petrol, a mechanical issue has started: whatever is shed by a pump that's wearing travels downstream to your injectors with your fuel.
How bad is petrol in a diesel? Four scenarios our engineers see in Little End
Fuelled but not once started — the best it gets. Only your tank has petrol in it, so the job is emptying the tank and cleaning the system where the car sits. This situation can only truly take place at a forecourt: anywhere else, your car got there by being driven.
Ignition on, or started for a moment. Petrol has left that tank and got to your filter and your lines, since the system has been primed. That's generally still a simple job — a drain, a flush, and the filter dealt with.
Some miles driven, and the pump has spent each of them working on diluted fuel. The work is the tank, the lines, the filter and fresh fuel through the entire circuit, and how hard your car was driven matters as much as how far. A school run to Warboys Primary Academy is one matter. Any mileage on the A1(M), under 10 miles from Little End, means the motor has worked hard throughout, and a run to Peterborough, under 15 miles away, makes a very different job too.
Driven until it protested. Clattering, a lumpy idle, smoke, a throttle that has gone soft. The fuel isn't behaving like diesel any more, and the engine is saying so. Pull up wherever you are — the verge on Coronation Avenue, a lay-by, a side street — and leave it where it is. The drain and flush-through still go first, and they take care of it: when a car is stopped early, lasting damage is very unusual.
Stories Little End drivers hear about petrol in a diesel
False: topping up to full with diesel makes it fine. It does not. Nothing comes out when you top up — your tank simply holds more of the same mixture. A diesel fuel system doesn't tolerate petrol by percentage in the way that advice presumes.
If anything, the opposite is true. Myth: "A newer diesel can cope with a bit of petrol." Finer parts and higher pressure are the way a current diesel runs its fuel, and that makes the lubrication count more, not less.
"It starts, it drives, and so no harm done" — the myth that trips up most motorists than any other. Feed diesel to a petrol motor and it normally will not run, and so the motorist stops — and the harm stops with them. A diesel fed petrol generally starts, ticks over and drives away as though nothing has happened, whilst the pump grinds. Fine and running are not the same at all.
An old fix for a separate fault lies behind this one. Myth: "Add some two-stroke oil and drive the car home." The petrol is still in that tank after that, and whatever it has weakened is not put back.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol sits in the filter and lines, waiting to go right back through the pump on your next start. Draining petrol into a can by the roadside is also genuinely risky.
Petrol in a diesel: how does it take place?
Nobody does it on purpose, and it is seldom carelessness. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol vehicle at all. The forecourt makes it easy, and the mistake runs one way.
The moment routine stops matching the car is the moment it takes place. A motor that's new to you — hired, on loan as a courtesy car, or just bought. One petrol and one diesel on the drive of the same household. The pumps in a different order on a well-known forecourt. A rushed fill en route to Huntingdon with a train to catch. Precisely the moment it occurs: after years of driving petrol, a driver fills a diesel Volkswagen Passat for the first time. Add a back seat full of children, a phone call or rain, and the hand wins.
Preventing petrol in a diesel next time you fill up in Little End
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most usually do. Check the petrol pump's label; the colour is only a clue.
- Check the filler flap. Many cars state the fuel type inside the flap or on the cap. Look at it on your first fill in any vehicle you do not know.
- Good intentions do less than a sticker or a fob in a bright colour on the diesel's key if a home has one of each. So mark it.
- "Diesel", out loud, before you lift the nozzle — each time a new or hired car needs its first tank. It seems daft. It works.
- Mistakes like this are simple to make while your mind is on something else, and so your phone goes away.
- Some diesels come with a filler built 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 reading the petrol pump.
- Noticing it halfway? Stop there and then. A thinner mix results from less petrol in that tank, but the next stage stays the same: don't start the vehicle.
Little End: already put petrol in a diesel?
The order of things is short, then. Do not turn your ignition on, and do not crank it. If you are still at the forecourt — Ouse Valley Autos or anywhere else — ask the staff to help you push the car away from the pump. Call 0333 366 0103 next, with three facts — your fuel, the approximate amount, and whether it's run.
Corrosion and deposits are the problem with AdBlue, where petrol brings lost lubrication. So if it was AdBlue, say so — and read its own Little End page.
Why one petrol in a diesel task around Little End costs more than another
Four different jobs lie behind the four situations above — which is why there's no fair single quote. What shifts your cost is mostly which of them you're in. Next it's the share — how much petrol got in against how much the tank holds — and then where the car is and whether a van can get to it safely.
Three queries come first, before quoting, rather than after — what went in, how much, has it run — and this is the reason. With those replies, there is a straight figure instead of a range.
About Little End itself
Little End is a suburban area in Cambridgeshire, situated inland at an elevation of 26 metres, and located approximately 13 miles from Peterborough. Little End is characterized by its predominantly detached housing stock, and is part of a network of nearby settlements including Mill End, Warboys, and Ramsey End. Little End has a population of around 2033 residents, and is positioned about 62 miles north of London.
Fuel drain cover across Cambridgeshire, Little End included
The teams answering petrol in diesel jobs in Little End, in the PE postcode area, also work the places near it, Mill End, Warboys and Ramsey End among them. The vehicle doesn't need to come to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
At the pump in Little End, right now?
No position is better: that is where you are. Switched off it remains; then phone.