How Worried Should You Be? Petrol in a Diesel Car in Bitterscote
Unstarted? Then less anxious than you likely feel. Everyone around Bitterscote begins with "have I wrecked it?", and the fair answer is usually no: petrol resting inside the tank of any diesel remains harmless till priming, cranking or driving draws it into the system. Keep it like that: leave the engine off then ring Petrol in Diesel. Read on for three things: the effect petrol has inside a diesel motor, the clues of how far it has spread, and the way to make sure you don't do it again.
What petrol in a diesel does to your engine
Two jobs fall to diesel on its route through a motor. Before it combusts, it lubricates — then it combusts. Very fine clearances go into your injectors and the high-pressure fuel pump, and only your diesel running through keeps those surfaces from grinding together.
Petrol handles the first task badly and the second not at all. It's runnier than diesel and removes the protection the system hinges on, and so a pump running on a petrol blend is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the knocking comes from.
Combined, those leave the shape of the issue plain. Contact does not do the damage — circulation does. A tank with petrol in it is a fuel fault. Once the pump has been labouring on that petrol, a mechanical fault has begun: whatever is shed by a pump that's grinding travels downstream to the injectors with your fuel.
How bad is petrol in a diesel? Four situations our engineers see around Bitterscote
Fuelled but not once started — the best it gets. The petrol is inside your tank and only your tank, and the job is a drain and a flush where the car sits. This is the one scenario that can only really take place at a forecourt, as anywhere else the car has been driven to get there.
Started for a moment, or only the ignition on. Your system has been bled, so petrol has left that tank and got to the fuel filter and the fuel lines. Still usually easy: drain, flush, and the filter dealt with.
Driven a couple of miles. Now the pump has spent these miles working on weakened fuel. Tank, lines, filter, then fresh fuel run through the entire circuit: that's the work, and the way your car was driven counts as much as the miles. A school run to Moorgate Primary Academy is one thing. Driving as far as Lichfield, under 10 miles away, makes a very different job — as does any distance on the M42, under 3 miles from Bitterscote, with the motor working hard the whole time.
It protested, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone ragged. The motor is telling you the fuel is no longer acting like diesel. Leave it where it has stopped: a lay-by, a side street, the verge on Lady Meadow Close. A car stopped soon very rarely has lasting damage, because the fuel drain and the flush, which still come first, take care of it.
Bitterscote 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 is removed by topping up — you are left with a fuller tank, still the same mix. The assumption behind the guidance — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. Finer parts and higher pressure are the way a modern diesel runs its fuel, and that makes the lubrication count more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there's no damage done." The motorist of a petrol engine fed diesel usually stops, since it will not run, and the harm stops with them. A diesel fed petrol normally starts, ticks over and drives away as if nothing has happened, while the pump wears. Being able to run isn't the same as being fine.
Myth: a two-stroke additive lets you to drive home. It is an old workaround, meant for another issue. None of what petrol thinned is put back by it — and afterwards, your tank still holds that petrol.
If the motor has run, part of the petrol sits in the filter and your lines, not your tank — and your next start sends it straight back through your pump. So the myth "drain your tank yourself and you're sorted" doesn't stand up. On top of that, petrol emptied into a can by the road is genuinely dangerous.
Petrol in a diesel: how does it happen?
It is seldom carelessness, and nobody does it on purpose. The petrol nozzle is the smaller of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol car at all. The forecourt makes it easy, and the error runs one way.
Routine and the car falling out of step is when it takes place. Hire cars, courtesy cars, and vehicles that are new to you. Households running one of each, petrol and diesel. A familiar forecourt with the pumps in a different order. Fuelling up in a rush on the way to Tamworth, with a train to catch. The first fill-up in a diesel Skoda Octavia after years of driving petrol is precisely the moment it happens. Your hand repeats what it has always done once you add rain, a phone call or a back seat full of kids.
How to avoid petrol in a diesel at your next fill-up in Bitterscote
- Green 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.
- In a motor you do not know, look inside the flap over the filler or at the cap before the first fill: plenty of cars print the fuel there.
- Label your 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.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It seems daft and it does the trick.
- Mistakes like this are straightforward to make whilst your mind is on something else, and so the phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to reject a petrol nozzle, and add-on devices exist for vehicles without one. They are a backstop, not a reason to stop checking the pump.
- Spotting it mid-fill? Stop there and then. A weaker mixture results from less petrol inside the tank, yet your next step stays the same: do not crank it.
Petrol already in a diesel in Bitterscote? Begin here
In that case, there's only a short order of things. Do not fire it up, and don't switch your ignition on. Still on the forecourt, at Sainsbury's or anywhere else? Ask the attendants to help you push the car away from the petrol pump. Then ring 0333 366 0103 and tell us what got in, about how much, and if it's run.
Corrosion and deposits are the trouble with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and read its own Bitterscote page.
Bitterscote petrol in a diesel jobs: why one costs more than another
A fair single price doesn't exist here: four scenarios, four separate jobs. Mostly, the cost moves with which situation you're in. Two things follow that: the petrol that got in as a proportion of what your tank takes, then the place the car is in and whether our van can get to it safely.
That is why our engineers ask three queries before costing instead of after: what got in, how much, and if it's run. A range turns into a straight figure when those answers are in.
About Bitterscote itself
Bitterscote is a locality situated on the riverside in Staffordshire, with an elevation of 67 metres above sea level. Bitterscote lies approximately 6.6 miles from the city of Lichfield and is part of the wider West Midlands region. Bitterscote is characterized by its predominantly flat housing stock and is close to nearby places such as Tamworth and Kettlebrook. Bitterscote has a small population of around 525 residents.
Bitterscote and Staffordshire: where our fuel drain cover runs
Bitterscote rests in the B postcode area, and the vans that answer petrol in diesel call-outs there work the places near it as well — Tamworth, Kettlebrook and The Leys among them. Our engineers drain wherever your vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
In Bitterscote and still at the petrol pump?
Then you are in the best spot there is. Leave it switched off, and ring.