Should You Worry? Petrol in a Diesel Car in Freeland
Less than you probably are, provided it has not been started. Until your ignition primes the pump, the starter turns, or your car is driven, petrol in a diesel tank just waits there and does nothing. Which makes the truthful reply to that first Freeland question — "have I wrecked it?" — normally no. Petrol in Diesel is who to ring, with your engine left off, and so it remains that way. 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 repeat it.
The engine and petrol in a diesel: what happens
Two tasks fall to diesel on its route through a motor. Before it burns, it lubricates — and then it ignites. Designed to very fine tolerances, the fuel injectors and the pump rely on your diesel moving through them to keep their surfaces from wearing against one another.
The second job petrol doesn't do at all, and the first it does badly. The clattering 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 protection your system hinges on, and any pump working on such a blend is wearing itself.
Put those together and the shape of the issue is plain. Contact doesn't do the damage — circulation does. Any tank with petrol in it is a fuel problem. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the fuel injectors further on.
How bad is petrol in a diesel? Four situations our technicians see in Freeland
Filled up, and not started: nothing beats it. On a forecourt, and truly only there, that petrol is still confined to your tank — since anywhere else the car was driven to reach it. The task is emptying and purging on the spot.
Started for a moment, or only your ignition on. Petrol has left that tank and got to the filter and the lines, because the fuel system has been bled. Normally nothing more than clearing, flushing and sorting the fuel filter, so still straightforward.
Those few miles driven were your pump labouring on fuel thinned by petrol throughout. How hard the car was driven counts as much as how far, and this work covers the tank, the fuel lines, the fuel filter and fresh fuel through the whole system. Short trips, such as the school run to Freeland Church of England Primary School, are one thing. Getting as far as Oxford, under 10 miles away, makes a very different task — as does any miles on the M40, under 10 miles from Freeland, with the motor labouring hard all the way.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone uneven. That's your motor telling you its fuel no longer is behaving like diesel. Stop on the spot — on the verge on Wroslyn Road, at the kerb, down a side road — and do not move it again. A car stopped quickly very seldom has lasting damage, because the drain and the flush-through, which still come first, sort it out.
Myths Freeland drivers hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing is removed when you top up — your tank just holds more of the same blend. The assumption behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: a modern diesel copes with a bit of petrol. If anything, the reverse. Smaller parts and higher pressure are how a current diesel runs its fuel, and that makes the protection matter more, not less.
The myth that catches drivers off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol engine and it generally won't run, so the motorist stops — and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile your pump wears. Running does not mean fine.
An old fix for a separate problem is behind this one. Myth: "Add some two-stroke oil and drive the car home." It does not put back what petrol has thinned, and the petrol is still in your tank after that.
The next start sends petrol back round the pump from the fuel lines and the filter, where some of that ends up once your engine has been run. That's why draining your tank yourself does not leave you sorted — a myth. It's also truly hazardous to drain petrol into a can at the roadside.
How petrol ends up: petrol in a diesel
No one does it on purpose, and it's seldom carelessness. A diesel nozzle generally will not go into a petrol car, yet the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake straightforward, and only in that direction.
When routine and the vehicle stop matching, it occurs. Hire cars, courtesy cars, and motors that are new to you. One petrol and one diesel on the drive of the same household. A forecourt you know, but with its pumps laid out differently. A train to catch, and a hurried fill en route to Combe. A new-to-you diesel Volkswagen Tiguan, its first fuelling, and a motorist used to petrol: precisely when it happens. The hand does what it has always done once you add rain, a phone call or a back seat full of kids.
Preventing petrol in a diesel next time you fill up in Freeland
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most usually do. Check the pump's label; the colour is only a hint.
- Inspect the filler flap. Many cars state the fuel type inside the flap or on the cap. Look at it on your first fill in a motor you don't know.
- A coloured fob or a sticker on the diesel's key does more than any amount of intending to remember, in a home with one of each.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the pump. It sounds daft and it works.
- Mistakes like this are easy to make whilst your mind is on something else, so the phone goes away.
- Add-on devices exist for motors without one, and some diesels are built with a filler that will not take a petrol nozzle. Helpful — but a backstop at best, never a reason to stop checking the label.
- Noticing it halfway? Stop there and then. A weaker mixture results from less petrol inside that tank, but the next step stays the same: do not crank it.
Petrol already in a diesel in Freeland? Begin here
The order of things is brief, then. Don't switch your ignition on, and do not start it. If you are still at the forecourt — Gulf or anywhere else — ask the staff to help you push the vehicle clear of the petrol pump. Next, 0333 366 0103. We will ask what got in, about how much, and if it has been run.
Corrosion and deposits form the trouble with AdBlue, where petrol brings lost lubrication. So if it was AdBlue, say so — and read its own Freeland page.
One petrol in a diesel task in Freeland costs more than another. Why?
Four different jobs sit behind the four scenarios above — which is why there's no honest single quote. What shifts your cost is chiefly which of them you're in. The share counts next, meaning how much of that tank is petrol, followed by the position of the vehicle and whether reaching it is safe for our van.
What was put in, how much, and whether it's run — three questions we ask before quoting, not after, for exactly that reason. With those answers, there is a straight figure rather than a range.
About Freeland and its setting
Freeland is a small village in Oxfordshire, situated approximately 7.6 miles west of Oxford, and is characterized by its predominantly detached housing stock. Freeland sits in a rural area at an elevation of around 108 metres, near to other local places such as The Green, Church Hanborough, and Long Hanborough. Freeland is home to a population of around 719 residents, who enjoy its quiet inland setting. Freeland is also within commuting distance of London, being around 58.7 miles from the capital.
Across Oxfordshire and around Freeland: fuel drain cover
Our teams answering petrol in diesel call-outs around Freeland, in the OX postcode area, also work the spots near it, The Green, Church Hanborough and Long Hanborough included. Our engineers drain wherever the vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the petrol pump around Freeland?
The best position there is, then — that is where you are. Leave the car turned off, and ring.