Petrol in a Diesel Car in Ramsden Heath: How Worried Should You Be?
If it hasn't been started, you can worry less than you probably are. "Have I ruined it?" is the first question everyone around Ramsden Heath asks, and the truthful answer is normally no, because petrol resting in a diesel tank hurts nothing until it's dragged through the system — by ignition priming, by the starter, or by driving. To leave the vehicle that way, call Petrol in Diesel and leave your engine alone. Below, this page sets out what petrol really does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
Inside the motor: what petrol in a diesel does
Two jobs fall to diesel on its route through a motor. Oiling comes before burning; it does both. What stops the surfaces inside your high-pressure pump and your injectors from wearing down against one another is the diesel flowing through them — they're built to extremely fine gaps.
The second job petrol doesn't do at all, and the first it does poorly. It's runnier than diesel and takes away the protection the system rests on, and so a pump running on a petrol mixture is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That's where the clattering comes from.
The shape of the trouble is clear when you put those together. Contact doesn't do the harm — movement does. A tank with petrol in it is a fuel issue. Once your pump has been working on that petrol, a mechanical fault has started: whatever is shed by a pump that's grinding is carried onward to the injectors with your fuel.
Ramsden Heath, petrol in a diesel: four cases, from mild to serious
Filled up, and never started: nothing beats it. At a forecourt, and really only there, the petrol is still confined to your tank — since anywhere else the car was driven to get to it. The job is draining and cleaning on the spot.
Started for a second, or just your ignition on. The system has been bled, and so petrol has left the tank and got to the fuel filter and the lines. Usually nothing more than draining, purging and seeing to the fuel filter, and so still straightforward.
Those few miles driven meant your pump running on fuel diluted by petrol throughout. How hard your car was driven matters as much as how far, and this work takes in the tank, the lines, the fuel filter and clean fuel through the entire circuit. Short trips, such as the school run to Downham Church of England Voluntary Controlled Primary School, are one matter. A run as far as Chelmsford, under 10 miles away, is a very different task. So is any miles on the M25, under 10 miles from Ramsden Heath, where your engine has been working hard the whole time.
Driven till it protested. Clattering, a ragged idle, smoke, a throttle that has gone soft. The fuel isn't acting like diesel any more, and the engine is saying so. Whether it's the verge on Heath Road, a lay-by or a side street, stop where you are then leave it. Lasting damage is very uncommon if a car is pulled over early, and the fuel drain and flush that still come first sort it out.
Ramsden Heath motorists and the 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 when you top up — the tank simply holds more of the same mixture. That advice assumes a diesel fuel system handles petrol by percentage. It does not.
If anything, the reverse is true. Myth: "A newer diesel can cope with a bit of petrol." Finer parts and higher pressure are how a current diesel runs its fuel, and that makes the lubrication matter more, not less.
One myth that catches drivers off guard: if it starts and drives, it must be unharmed. The motorist of a petrol engine fed diesel normally stops, since it will not run, and the damage stops there. 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. Fine and running aren't the same at all.
An outdated workaround for a distinct problem is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." That petrol is still in your tank afterwards, and whatever it has weakened is not put back.
The next start draws petrol back round the pump from the fuel lines and the filter, where some of it sits once the engine has been run. That's why draining the tank yourself doesn't sort it — a myth. Also, a can of petrol filled by the kerbside is truly risky.
How petrol ends up: petrol in a diesel
On purpose? Never. Through carelessness? Seldom, if ever. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle mostly will not go into a petrol motor at all. So the slip runs one way.
The moment habit stops matching the vehicle is the moment it takes place. A new car, a hire car or a courtesy car. Two vehicles on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A train to catch, and a hurried fill on the way to Billericay. Precisely the moment it occurs: after years of driving petrol, someone fills a diesel Renault Megane for the first time. With rain, a call arriving, or a car full of children to deal with, the hand simply does what it has always done.
Next time you fill up in Ramsden Heath: preventing petrol in a diesel
- The label is what matters, so check the petrol pump rather than the colour: in the UK unleaded handles are usually green and diesel black, yet not on each forecourt.
- Inspect the filler flap. Many vehicles state the fuel inside the flap or on the cap. Look at it on the first fill in a motor you don't know.
- One of each in the home? Mark your key to the diesel — a bright fob, a sticker — because meaning to remember is not enough.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump. It sounds daft and it works.
- Mistakes like this are simple to make while your mind is on something else, and so your phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler built to reject a petrol nozzle, and add-on devices exist for cars without one. They are a safety net, not a reason to stop reading the petrol pump.
- Noticing it mid-fill? Stop there and then. A weaker mix results from less petrol inside the tank, but your next stage stays the same: do not crank it.
Ramsden Heath: already put petrol in a diesel?
In that case, there's only a short order of things. Never fire it up, and do not turn the ignition on. Still at the forecourt, at Gulf or anywhere else? Ask the staff to help you roll it away from the pump. What was put in, about how much, and if it's run: tell us that when you call 0333 366 0103.
Corrosion and deposits are the problem with AdBlue, where petrol means lost lubrication. So if it was AdBlue, say so — and read its own Ramsden Heath page.
What makes one Ramsden Heath petrol in a diesel task cost more than the next
The four scenarios above are four separate tasks, so no single price for this would be fair. Mostly, your cost shifts with which situation you're in. The ratio counts next, meaning how much of the tank is petrol, followed by the position of the vehicle and whether reaching it is safe for a van.
Three questions come first, before quoting, instead of after — what got in, how much, has it run — and that is the reason. A range turns into a straight figure once the replies are in.
About Ramsden Heath and where it is
Ramsden Heath is a village in Essex, situated approximately 7 miles from Chelmsford and 27 miles from London, with a mix of rural and residential areas. Ramsden Heath has a population of around 2308 people, and is characterised by predominantly detached housing. Ramsden Heath sits in a relatively low-lying area, with an elevation of about 64 metres, and is near to other local places such as Downham and Ramsden Bellhouse.
Across Essex and around Ramsden Heath: fuel drain cover
Ramsden Heath sits in the CM postcode area, and our vans that answer petrol in diesel calls there work the locations near it as well — Downham, Ramsden Bellhouse and Brock Hill among them. No need to move the car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations where we work.
In Ramsden Heath and still at the petrol pump?
Then you're in the best position there can be. Keep the car switched off, and ring.