How Worried Should You Be? Petrol in a Diesel Car in Thorpe
If it hasn't been started, you can worry less than you probably are. Petrol resting in a diesel tank does nothing to your motor until something draws it through your fuel system — the ignition priming the pump, the starter, or driving on its own. So the honest answer to the first query anyone in Thorpe asks, "have I wrecked it?", is normally no. Petrol in Diesel is who to phone, with the motor kept off, and so it stays that way. Below, you will find what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you again.
Petrol in a diesel: what does it do to the engine?
Diesel has two jobs on its way through an engine. It ignites, and before it burns it protects. The high-pressure fuel pump and your injectors are built to extremely fine gaps, and the diesel passing through them is what keeps those surfaces from wearing against one another.
Poorly at the first, not at all at the second: that's petrol. The rattling comes from petrol being designed not to ignite when compressed, which is precisely the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips away the lubrication the system rests on, and any pump working on such a mix is wearing itself.
Combined, those leave the shape of the trouble clear. Contact doesn't do the damage — movement does. Where the petrol is only inside your tank, it's an issue of fuel, nothing more. Whatever a worn pump sheds travels on, carried by the fuel, into the fuel injectors further along, which is why a pump that has worked on that petrol is where a mechanical problem begins.
Petrol in a diesel around Thorpe: how serious is it? Four cases
Filled up, and not started: nothing beats it. At a forecourt, and truly only there, that petrol is still limited to that tank — since everywhere else the car was driven to reach it. The task is draining and rinsing on the spot.
Ignition on, or started for a second. With the system primed, the fuel lines and filter now hold petrol that has come from your tank. Usually little more than clearing, flushing and seeing to your filter, so still easy.
Driven a couple of miles. Now your pump has spent these miles running on thinned fuel. The work is the tank, your lines, your filter and clean fuel through the entire system, and how hard the vehicle was driven matters as much as how far. Driving the kids to Thorpe CofE Aided Primary School is one sort of trip. Any miles on the M25, under a mile from Thorpe, means the motor has worked hard throughout, and a run to Westminster, under 25 miles away, makes a very different job as well.
Knocking, an uneven idle, smoke, a throttle gone soft: driven until it complained. The fuel isn't acting like diesel any more, and your engine is saying so. Leave it where it has stopped: a lay-by, a side street, the verge on Green Road. What goes first is still the drain and flush-through, and that sorts it out, with long-term damage very unusual if a vehicle is stopped soon.
What Thorpe people get told about petrol in a diesel — and the myths in it
"Top it up the rest of the way with diesel and it will be fine" — a myth. It will not. Nothing comes out when you top up — the tank simply holds more of the same blend. That advice assumes a diesel fuel system tolerates petrol by percentage. It doesn't.
"Current diesels can handle a little petrol" — a myth, and closer to the opposite. 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 no harm done" — the myth that catches more drivers than any other. The motorist of a petrol motor fed diesel usually stops, because it will not run, and the harm stops there. Feed petrol to a diesel and it usually fires up, idles and drives away as if nothing has happened — all the while its pump wears. Running is not 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. What petrol has thinned remains thinned, and that petrol stays in that tank anyway.
"Drain it yourself and you're sorted" — a myth, because after it has been running some petrol lies in the fuel filter and lines, waiting to go straight back through the pump on your next start. Besides, petrol cleared into a can by the road is truly dangerous.
Why petrol in a diesel happens so easily
A careless moment is rarely the cause, and nobody means to do it. The forecourt makes it simple: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle mostly won't go into a petrol vehicle at all. So the mistake runs one way.
When routine and your car stop matching, it takes place. Courtesy car, hire car, or a vehicle that is brand new. One petrol and one diesel on the driveway of the same household. A forecourt you know, only with its pumps laid out differently. Filling up in a rush on the way to Virginia Water, with a train to catch. Years of petrol vehicles behind you, a diesel Volkswagen Golf in front of you at the forecourt for its first tank — that is when. Throw in a back seat full of children, a phone call or rain, and habit takes over.
Thorpe drivers: how to prevent petrol in a diesel next time
- Read the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on every forecourt. The label is what counts.
- Inspect the filler flap. Many cars state the fuel inside the flap or on the cap. Look at it on your first fill in a vehicle you do not know.
- Good intentions do less than a sticker or a fob in a vivid colour on the diesel's key if a household has one of each. So mark it.
- "Diesel", out loud, before you pick up the nozzle — each time a new or hired car needs its first tank. It sounds silly. It does the trick.
- Whilst you are thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to block a petrol nozzle, and add-on devices are available for the rest. Treat it as a safety net, and keep reading the petrol pump.
- Spotting it mid-fill? Stop at once. A weaker mix follows from less petrol inside that tank, yet your next stage stays the same: don't fire it up.
Put petrol in a diesel in Thorpe already?
Short and simple, then, is the order of things. Don't fire it up, and do not turn the ignition on. If you are still at the forecourt — Shell or anywhere else — ask the attendants to help you push the car away from the petrol pump. What was put in, roughly how much, and if it has run: tell us that when you ring 0333 366 0103.
Say so if it was AdBlue rather than petrol: it's a different fault, with its own page for Thorpe, since AdBlue brings corrosion and deposits instead of lost protection.
Thorpe petrol in a diesel jobs: why one costs more than another
The four situations above are four separate jobs, so no single price for this would be honest. Which of them you are in is chiefly what moves the cost. Two things follow that: the petrol that went in as a proportion of what your tank takes, then the spot the car is in and whether our van can reach it safely.
That's why our technicians ask three queries before quoting instead of after: what got in, how much, and whether it's run. The answers change a range into a straight figure.
About Thorpe and its setting
Thorpe is a village in Surrey, situated on the lakeside at an elevation of 16 metres, with detached housing being the predominant type of accommodation. Thorpe lies approximately 18.8 miles from London and is close to nearby places such as Thorpe Green, St Anns Hill, and Stroude. Thorpe has a population of around 1226 residents and is located near the city of Westminster. Thorpe benefits from its scenic lakeside setting, which attracts visitors to the area.
Thorpe and Surrey: where our fuel drain cover runs
Thorpe waits in the TW postcode area, and our teams that answer petrol in diesel calls there work the spots near it as well — Thorpe Green, St Anns Hill and Stroude among them. A forecourt, a supermarket car park, a lay-by or your own drive are all locations our technicians work, and the vehicle doesn't need to come to us.
Thorpe: still at the petrol pump?
No position is better: that's where you now are. Phone, and keep it turned off.