Should You Worry? Petrol in a Diesel Car in Workhouse Common
Far less than you probably are, if it hasn't been started. Until your ignition primes your pump, your starter turns, or the vehicle is driven, petrol in a diesel tank simply sits there and does no harm. Which means the truthful reply to that first Workhouse Common question — "have I ruined it?" — usually no. Keep it that way: leave the engine off and ring Petrol in Diesel. The rest of this page explains what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it doesn't happen to you again.
What petrol in a diesel does to your engine
Two tasks fall to diesel on its journey through a motor. It lubricates to begin with, and after that does it burn. What keeps the surfaces inside the high-pressure fuel pump and your injectors from wearing against one another is the diesel passing through them — they're made to very fine clearances.
Petrol handles the first job poorly and the second not at all. The rattling comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips out the lubrication the system hinges on, and any pump running on that mix is wearing itself.
The shape of the problem is plain once you put those together. It is movement that causes the harm, not contact. All a tank with petrol in it amounts to is a fuel problem. Once your pump has been running on that petrol, a mechanical problem has begun: whatever is shed by a pump that is grinding travels downstream to the injectors with your fuel.
Petrol in a diesel in Workhouse Common: how bad is it? Four cases
Filled but not once started — the best it gets. Just the tank has petrol in it, and so the job is emptying that tank and rinsing the fuel system where the car stands. This scenario can only truly happen at a forecourt: anywhere else, your car got there by being driven.
Ignition on, or started for a moment. Your system has been primed, so petrol has left that tank and reached your filter and your lines. Usually little more than clearing, rinsing and sorting the fuel filter, and so still simple.
Some miles driven, and the pump has spent each of them working on weakened fuel. The work is your tank, your lines, your filter and clean fuel through the whole system, and how hard the vehicle was driven counts as much as how far. Short trips, such as the school run to Rosecroft Primary School, are one thing. Very different again: a trip to Norwich, under 25 miles away, or any distance on the M11, under 50 miles from Workhouse Common, where the engine never stopped running hard.
Driven on until it protested — knocking, smoke, a ragged idle, a dead throttle. That's your motor telling you its fuel has stopped acting like diesel. Pull up where you are — on the verge on A11, at the kerb, down a side road — and do not move it. Permanent damage is very unusual if a vehicle is stopped quickly, and the fuel drain and flush-through that still come first deal with it.
What Workhouse Common people get told about petrol in a diesel — and the myths in it
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. A fuller tank of the same mix is all you get, since topping up removes nothing. Percentage is not how a diesel fuel system copes with petrol, whatever that guidance supposes.
"Current diesels can handle a little petrol" — a myth, and nearer the opposite. Finer components and higher pressure are the way a current diesel runs its fuel, and that makes the lubrication matter more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that fools motorists. Any petrol engine fed diesel normally will not run, and so the motorist stops and the harm stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile the pump grinds. Running isn't the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a different fault. None of what petrol diluted is put back by it — and later, the tank still contains the petrol.
Myth: "Drain your tank yourself and you are sorted." Once the motor has been run, some of that petrol is no longer inside your tank: it's in the filter and your lines, and it goes right back through your pump at the next start. And, a can of petrol drained at the roadside is truly hazardous.
How does petrol in a diesel occur?
Nobody does it on purpose, and it's rarely carelessness. A diesel nozzle mostly will not fit a petrol motor, yet the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake easy, and only in that direction.
Habit and your car getting out of step is how it occurs. Hire cars, courtesy cars, and motors that are new to you. Households running one of each, petrol and diesel. The pumps in a different order on a familiar forecourt. A hurried fill on the way to Attleborough with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: exactly when it takes place. The hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
Next time you fill up around Workhouse Common: avoiding petrol in a diesel
- A green handle for unleaded and black for diesel is normal in the UK — yet not on each forecourt. Trust the label on the pump, not the colour.
- Many vehicles state the fuel inside the filler flap or on the cap, and so check there on your first fill in any vehicle you don't know.
- Good intentions do less than a sticker or a fob in a bright colour on your diesel's key when a household has one of each. So label it.
- Before the nozzle leaves the petrol pump the first time you fill a hired or new car, say "diesel" out loud. Daft, yes, but it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, so put your phone away and keep your mind on the pump.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to refuse a petrol nozzle, and add-on devices exist for motors without one. They are a safety net, not a reason to stop reading the petrol pump.
- The moment you realise, stop: less petrol in your tank means a weaker blend. What to do next doesn't change, though — still do not start the vehicle.
Put petrol in a diesel in Workhouse Common already?
The order of things is brief, then. Leave it unstarted, with the ignition switched off as well. The attendants at the forecourt — whether at Sainsbury's itself or wherever you filled up — will normally help roll it clear of the pump if you ask. Ring 0333 366 0103 next, with three facts — your fuel, the rough amount, and if it has run.
If it was AdBlue instead of petrol, say so. That's a separate fault — corrosion and deposits and not lost protection — and it has its own page for Workhouse Common.
Why one petrol in a diesel job in Workhouse Common costs more than another
The four scenarios above are four different jobs, so no single quote for this would be honest. Which of them you are in is mostly what shifts your cost. Beyond that it is the ratio — how much petrol was put in against how much the tank holds — and after that where your car is and whether a van can get to it safely.
Three queries come first, before any quote, instead of after — what went in, how much, has it run — and this is the reason. Those answers turn a range into a straight figure.
About Workhouse Common, briefly
Workhouse Common is a small hamlet in Norfolk, situated inland at an elevation of around 30 metres, approximately 15 miles from Norwich. Workhouse Common lies near other local places such as Haverscroft Street and Attleborough, and is characterized by its semi-detached housing. Workhouse Common is part of a wider rural area in eastern England, about 84 miles from London.
Fuel drain cover across Norfolk, Workhouse Common included
The teams answering petrol in diesel jobs in Workhouse Common, in the NR postcode area, equally work the locations around it, Haverscroft Street, Attleborough and Baconsthorpe included. You need not bring the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places where we work.
Workhouse Common: still at the pump?
The best spot there is, then — that is where you are. Turned off it stays; then call.