Should You Worry? Petrol in a Diesel Car in Mwdwl-eithin
Likely less than you are now — provided nobody has started the vehicle. Until your ignition primes your pump, your starter turns, or your vehicle is driven, petrol in a diesel tank simply waits there and does no harm. Which makes the truthful reply to that first Mwdwl-eithin query — "have I ruined it?" — usually no. To leave the vehicle that way, ring Petrol in Diesel and leave the motor 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 again.
Your engine and petrol in a diesel: what goes on
On its way through a motor, diesel has two jobs. Before it combusts, it lubricates — then it ignites. The high-pressure pump and your injectors are built to extremely fine gaps, and your diesel passing through them is what stops those surfaces from grinding against each other.
Petrol does the first task poorly and the second not at all. The clattering comes from petrol being designed not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection the system rests on, and any pump working on that mixture is wearing itself.
Combined, those leave the shape of the problem plain. Not contact but movement is what does the damage. Petrol in the tank is a fuel issue. A pump that has been working on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the fuel injectors downstream.
Petrol in a diesel around Mwdwl-eithin: how bad is it? Four cases
Filled up, and never started: nothing beats it. Being on a forecourt is what makes this the case: elsewhere, the car has been driven there to begin with. With the petrol held inside your tank alone, it's drained and rinsed right where it stands, and nothing more is needed.
A brief spell of running, or just the ignition on. With your system primed, your lines and filter already contain petrol that came from that tank. That's usually still an easy task — a drain, a flush, and the fuel filter seen to.
The pump has worked a couple of miles on thinned fuel — that is what driving the car does. Tank, lines, filter, then fresh fuel put through the entire circuit: that is the work, and the way your car was driven matters as much as the distance. On the school run to the local primary school, the miles is short. Any mileage on the M53, under 10 miles from Mwdwl-eithin, means your engine working hard throughout, and a run to St Asaph, under 10 miles away, makes a very different task too.
Driven until it protested. Clattering, a lumpy idle, smoke, a throttle that has gone soft. What you are hearing is the engine reporting fuel that no longer acts like diesel. Leave it wherever it has stopped: a lay-by, a quiet street, the verge on Carmel Road. A vehicle stopped early very seldom has lasting damage, as the drain and the flush, which still go first, sort it out.
What Mwdwl-eithin people get told about petrol in a diesel — and the stories in it
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. A fuller tank of the same mixture is all you get, because topping up removes nothing. A diesel fuel system doesn't accept petrol by percentage in the way that guidance assumes.
"Newer diesels can handle a little petrol" — a myth, and nearer the reverse. More precise parts and higher pressure are the way a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
This is the one that fools people. Myth: "If it starts and drives, there's no damage done." A petrol motor fed diesel normally won't run, and so the motorist stops and the harm stops with them. While your pump grinds, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Running is not the same as fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an old fix for a distinct problem. What petrol has diluted remains weakened, and the petrol remains in that tank regardless.
Myth: "Drain that tank yourself and you are sorted." Once your engine has been run, some of the petrol is no longer in that tank: it is in the fuel filter and the fuel lines, and it goes straight back through the pump on the next start. It's also really hazardous to drain petrol into a can at the kerbside.
How petrol ends up: petrol in a diesel
No one does it on purpose, and it is seldom carelessness. One way only, since of the nozzles: the smaller petrol one slips inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol car. That is how the forecourt makes it simple.
The moment routine stops matching your car is the moment it takes place. A motor that is new to you — a hire car, on loan as a courtesy car, or brand new. Two cars on one driveway, one petrol, one diesel. A forecourt you know, but with its pumps laid out differently. A train to catch, and a rushed fill en route to Flint. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver used to petrol: exactly when it occurs. Throw in a back seat full of children, a phone call or rain, and the hand takes over.
How to prevent petrol in a diesel at your next fill-up around Mwdwl-eithin
- Check the pump, not the colour. In the UK unleaded handles are generally green and diesel black, but not on every forecourt. The label is what counts.
- Inspect your filler flap. Plenty of vehicles state the fuel inside the flap or on the cap. Look at it on the first fill in a car you do not know.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of meaning to remember, in a household with one of each.
- Before the nozzle leaves the pump the first time you fill a hired or new motor, say "diesel" aloud. Silly, perhaps, but it does the trick.
- While you are thinking about something else, this is an easy mistake to make — so put the phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to block a petrol nozzle, and add-on devices are available for the remainder. Treat it as a safety net, and keep reading the pump.
- Less petrol means a thinner mixture, so stop as soon as you notice — while remembering that your next stage is unchanged. It is still not to start it.
Petrol already in a diesel in Mwdwl-eithin? Begin here
Short and simple, then, is the order of things. Don't turn your ignition on, and don't fire it up. If you are still at the forecourt — Texaco or anywhere else — ask the attendants to help you push it away from the petrol pump. Then phone 0333 366 0103 and tell us what got in, roughly how much, and whether it's run.
Say so if it was AdBlue rather than petrol: it is a different problem, with its own page for Mwdwl-eithin, because AdBlue brings corrosion and deposits instead of lost protection.
One petrol in a diesel task around Mwdwl-eithin costs more than another. Why?
There is no fair single quote for this, since the four situations above are four separate jobs. Chiefly, the cost shifts with which one you are in. Two things follow that: the petrol that went in as a share of what your tank takes, then the spot the car is in and whether a technician can reach it safely.
What went in, how much, and if it has run — three questions our engineers ask before costing, not after, for exactly that reason. The answers change a range into a straight figure.
About Mwdwl-eithin itself
Mwdwl-eithin is a coastal locality in Flintshire, situated near the towns of St Asaph and Carmel, with a mix of rural and residential areas. Mwdwl-eithin sits at an elevation of 224 metres, overlooking the surrounding countryside and the coast. Mwdwl-eithin is characterised by its predominantly detached housing stock, reflecting its role as a residential area with some agricultural activity.
Fuel drain cover in Mwdwl-eithin and across Flintshire
Mwdwl-eithin sits in the CH postcode area, and our vans that answer petrol in diesel jobs there work the places near it as well — Carmel, Pantasaph and Holway among them. A forecourt, a supermarket car park, a lay-by or your own drive are all locations our engineers drain, and your car doesn't need to come to us.
At the petrol pump in Mwdwl-eithin, right now?
Then you are in the best place there can be. Keep it off. Phone.