Should You Worry? Petrol in a Diesel Car in Higher Shurlach
Not started? Then less anxious than you probably feel. Petrol resting in a diesel tank does nothing to the motor till something pulls it through the system — the ignition priming your pump, the starter, or driving on its own. So the honest answer to the first question anyone around Higher Shurlach asks, "have I ruined it?", is generally no. To leave the car like that, ring Petrol in Diesel and leave the engine alone. Below, you will find what petrol actually does inside a diesel, how far it might have got, and how to stop it happening to you a second time.
What petrol in a diesel does to your engine
Two jobs fall to diesel on its journey round a motor. Lubricating comes before burning; it does both. What keeps the surfaces inside the high-pressure fuel pump and your injectors from wearing down against each other is your diesel passing through them — they're built to extremely fine gaps.
Of these two jobs, petrol handles the first poorly and the second never. A pump running on a petrol mix is wearing itself out, since petrol is thinner 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 needs from its fuel — and that's where the rattling starts.
The shape of the issue is plain when you put those together. It's circulation that causes the harm, not contact. All a tank with petrol in it amounts to is a fuel issue. Whatever a worn pump sheds goes on, borne by your fuel, into the fuel injectors further along, which is why a pump that has worked on that petrol is where a mechanical issue begins.
Petrol in a diesel in Higher Shurlach: how serious is it? Four situations
The best case there can be: filled up, never started. Being at a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With that petrol held inside that tank alone, it's emptied and rinsed right where it stands, and nothing more is needed.
Your ignition switched on, or a short start. The fuel system has been bled, so petrol has left your tank and reached your filter and your lines. Drain, flush, deal with the filter: still usually straightforward.
Those few miles driven were your pump working on fuel weakened by petrol throughout. The work is that tank, the lines, the fuel filter and fresh fuel through the whole circuit, and how hard your car was driven counts as much as how far. Driving the children to Rudheath Primary Academy and Nursery is one sort of trip. Any miles on the M6, under 5 miles from Higher Shurlach, means the motor has worked hard throughout, and a run to Chester, under 25 miles away, makes a very different job too.
Knocking, a lumpy idle, smoke, a throttle gone soft: driven till it complained. That is the engine telling you its fuel no longer is behaving like diesel. Stop wherever you are — the verge on Rudheath Way, a lay-by, a side street — then leave the car there. A vehicle pulled over soon very rarely has long-term damage, because the fuel drain and the flush-through, which still come first, sort it out.
Higher Shurlach people and that petrol in a diesel stories they hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing is removed by topping up — you're left with a fuller tank, still the same mixture. That advice presumes a diesel fuel system handles petrol by percentage. It doesn't.
If anything, the opposite is true. Myth: "A newer diesel can cope with a bit of petrol." Smaller components and higher pressure are how a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
"It starts, it drives, so there is no harm" — the myth that catches most motorists than any other. Diesel in a petrol motor usually means a motor that will not run: the driver stops, and so does the damage. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump wears. A running engine does not mean fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate problem. It does not put back what petrol has diluted, and that petrol is still in that tank afterwards.
If your engine has been run, part of that petrol sits in your filter and the lines, not that tank — and the next start pulls it right back through your pump. So the myth "drain the tank yourself and you're sorted" doesn't hold. Besides, petrol cleared into a can by the road is truly dangerous.
How it happens: petrol in a diesel
It is seldom carelessness, and no one does it on purpose. 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.
It takes place when habit and the vehicle stop matching. Hire cars, courtesy cars, and motors that are new to you. A household with one petrol and one diesel on the drive. A forecourt you know, but with its pumps laid out differently. Rushing for a train at Northwich and filling up en route. Years of petrol cars behind you, a diesel Renault Clio in front of you at the forecourt for its first tank — that's when. With rain, a call coming in, or a car full of children to deal with, your hand simply does what it has always done.
Avoiding petrol in a diesel next time you fill up in Higher Shurlach
- Green for unleaded and black for diesel is normal in the UK — but not on each forecourt. Trust the label on the 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.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, for a household with one of each.
- Before the nozzle leaves the pump the first time you fill a hired or new vehicle, say "diesel" aloud. Daft, yes, yet it works.
- Mistakes like this are easy to make whilst your mind is on something else, and so your phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to reject a petrol nozzle, and add-on devices are available for cars without one. They are a safety net, not a reason to stop checking the pump.
- The moment you notice, stop: less petrol in that tank means a thinner mixture. What to do next doesn't change, though — still do not start the car.
Higher Shurlach: already put petrol in a diesel?
The order of things is brief, then. Never crank it, and do not turn the ignition on. Yet on the forecourt, at Texaco or anywhere else? Ask the attendants to help you roll the vehicle away from the petrol pump. Next, 0333 366 0103. We will ask what was put in, about how much, and if it has been run.
Say so if it was AdBlue rather than petrol: it is a separate fault, with its own page for Higher Shurlach, because AdBlue brings corrosion and deposits rather than lost protection.
Why one petrol in a diesel job in Higher Shurlach costs more than another
A fair single price doesn't exist here: four situations, four separate tasks. The scenario itself does most of the work of moving the cost. Where your car is matters too, and whether our van can safely reach it, after the ratio of petrol to what your tank holds.
What got in, how much, and if it has run — three queries our technicians ask before quoting, not after, for precisely that reason. Given those answers, there is a straight figure instead of a range.
About Higher Shurlach
Higher Shurlach is a suburban area in Cheshire, situated on the riverside at an elevation of 28 metres, with semi-detached housing being the predominant type of accommodation. Higher Shurlach lies near the villages of Rudheath, Broken Cross, and Leftwich, and is approximately 17.4 miles from the city of Chester. Higher Shurlach has a population of around 1875 residents, and its location near the river gives it a distinctive character. Higher Shurlach is also relatively distant from London, at a distance of 155.9 miles.
Fuel drain cover across Cheshire, Higher Shurlach included
Our teams answering petrol in diesel call-outs around Higher Shurlach, in the CW postcode area, also work the locations near it, Rudheath, Broken Cross and Leftwich among them. A forecourt, a supermarket car park, a lay-by or your own drive are all spots we drain, and the vehicle doesn't need to move to us.
In Higher Shurlach and still at the petrol pump?
The best place there is, then — that's where you are. Switched off it stays; then phone.