West Drayton: Petrol in a Diesel Car? How Worried to Be
Likely less than you are now — provided no one has started the vehicle. Petrol sitting in a diesel tank does nothing to the engine until something draws it through the fuel system — the ignition priming your pump, the starter, or driving on its own. So the truthful answer to the first question everyone around West Drayton asks, "have I wrecked it?", is usually no. Petrol in Diesel is who to call, with the motor kept off, and so it stays that way. Keep reading for three things: the effect petrol has inside a diesel engine, the clues of how far it has spread, and ways to make sure you don't do it again.
The motor and petrol in a diesel: what goes on
On its way through a motor, diesel has two jobs. Before it ignites, it protects — and then it combusts. The high-pressure pump and the fuel injectors are built to very fine gaps, and your diesel passing through them is what keeps those surfaces from wearing down against each other.
Of those two jobs, petrol handles the first badly and the second never. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump running on that mixture to wear itself. It's equally made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the knocking.
Put those together and the shape of the trouble is clear. The harm is done by circulation, not by contact. Petrol in the tank is a fuel fault. Whatever a worn pump sheds goes on, borne by the fuel, into the injectors further along, which is why a pump that has worked on the petrol is where a mechanical fault starts.
Petrol in a diesel around West Drayton: how serious is it? Four cases
The best case there is: filled up, not once started. Being at a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With the petrol kept in the tank alone, it is cleared and flushed right where it stands, and nothing more is needed.
Started for a moment, or just your ignition on. With your system primed, the lines and filter already hold petrol that has come from your tank. Still normally easy: drain, flush, and your filter dealt with.
Those few miles on the road were the pump labouring on fuel thinned by petrol throughout. Miles is only half of it; how hard it was driven counts equally. Either way the work runs to that tank, the lines, your filter and clean fuel through the entire system. On the school run to West Drayton Academy, the miles is small. A run as far as Westminster, under 15 miles away, is a very different task. So is any miles on the M4, under a mile from West Drayton, where the engine has been labouring hard the whole time.
Driven on until it protested — clattering, smoke, a ragged idle, a soft throttle. The motor is telling you the fuel is no longer acting like diesel. Leave it wherever it has stopped: a lay-by, a side street, the verge on Harmondsworth Road. A vehicle stopped quickly very rarely has lasting damage, since the fuel drain and the flush, which still go first, sort it out.
Petrol in a diesel myths West Drayton people hear
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 takes out nothing. Percentage is not how a diesel fuel system tolerates petrol, whatever that guidance supposes.
"Modern diesels can handle a little petrol" — a myth, and nearer the reverse. At higher pressure, through more precise parts: that's how a current diesel handles its fuel, and so the protection matters for more, not less.
"It starts, it drives, and so there is no harm" — the myth that catches more motorists than any other. Feed diesel to a petrol motor and it normally won't run, so the motorist stops — and the harm stops with them. A diesel fed petrol usually starts, ticks over and drives away as though nothing has happened, whilst the pump grinds. A running engine does not mean fine.
Myth: "Add some two-stroke oil and drive it home." It is an outdated fix for a distinct fault. What petrol has thinned stays thinned, and that petrol remains inside the tank anyway.
The next start draws petrol back round the pump out of the lines and the filter, where some of that ends up once your engine has been run. That's why a DIY tank drain does not leave you sorted — a myth. And, a can of petrol filled by the kerbside is truly dangerous.
How it happens: petrol in a diesel
On purpose? Never. Through carelessness? Rarely, if ever. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle mostly will not go into a petrol car at all. So the slip runs one way.
It takes place when habit and the vehicle stop matching. Hire cars, courtesy cars, and vehicles that are new to you. Households running one of each, petrol and diesel. A forecourt you know, only with its pumps laid out differently. Rushing for a train outside the nearest station and filling up en route. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that's when. Add a back seat full of children, a phone call or rain, and habit wins.
West Drayton motorists: how to avoid petrol in a diesel next time
- The label is what matters, and so read the pump rather than the colour: in the UK unleaded handles are normally green and diesel black, but not on every forecourt.
- In a motor you don't know, look inside the flap over your filler or at the cap before the first fill: plenty of cars print the fuel there.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of intending to remember, for a home with one of each.
- "Diesel", aloud, before you pick up the nozzle — each time a new or hired car needs its first tank. It sounds daft. It works.
- Thinking about something else is when this becomes an easy mistake to make, so tuck your phone away and keep your mind on the pump.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to block a petrol nozzle, and add-on devices exist for the rest. Treat it as a backstop, and keep reading the petrol pump.
- Noticing it mid-fill? Stop there and then. A weaker mixture results from less petrol in your tank, but the next stage stays the same: don't fire it up.
Put petrol in a diesel around West Drayton already?
The order of things is brief, then. Don't turn the ignition on, and don't start it. The staff at the forecourt — whether at Gulf itself or wherever you filled up — will usually help push it clear of the pump if you ask. Next, 0333 366 0103. We will ask what went in, about how much, and if it has been run.
Say so if it was AdBlue instead of petrol: it's a separate fault, with its own page for West Drayton, since AdBlue brings corrosion and deposits rather than lost protection.
What makes one West Drayton petrol in a diesel task cost more than the next
The four scenarios above are four separate jobs, so no single price for this would be fair. Mostly, your cost shifts with which situation you're in. Where the car is counts too, and whether a technician can safely reach it, after the proportion of petrol to what that tank holds.
That's why our technicians ask three questions before quoting instead of after: what got in, how much, and whether it's run. The replies change a range into a straight figure.
About West Drayton itself
West Drayton is a locality in the western part of Greater London, situated on the River Colne at an elevation of around 29 metres. West Drayton lies near the M4 motorway and is close to the neighbouring areas of Yiewsley, Sipson, and Harmondsworth. West Drayton has a population of approximately 6038 people and is predominantly composed of flat-type housing. West Drayton is located about 14.6 miles from central London, with Westminster being the nearest city centre at a distance of 14.7 miles.
Fuel drain cover in West Drayton and across Greater London
The teams answering petrol in diesel calls in West Drayton, in the UB postcode area, also work the locations near it, Yiewsley, Sipson and Harmondsworth among them. The vehicle doesn't need to move to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the pump in West Drayton?
Then you are in the best place there can be. Leave the car turned off, then ring.