How Worried Should You Be? Petrol in a Diesel Car in Upper Dicker
Provided it hasn't been started, you can worry far less than you likely are. Everyone around Upper Dicker begins with "have I ruined it?", and the honest answer is usually no: petrol resting in that tank of any diesel remains harmless till priming, cranking or driving draws it into the system. Petrol in Diesel is who to call, with your engine left off, so it stays that way. What petrol really does to a diesel, how to gauge how far it has travelled, and how to stop it from happening again: that's the rest of this page.
Petrol in a diesel: what does it do to the engine?
Passing through an engine, diesel does two things at the same time. Lubricating comes before burning; it does both. The high-pressure fuel pump and the fuel injectors are built to very fine gaps, and your diesel passing through them is what stops those surfaces from grinding against one another.
Of these two jobs, petrol manages the first badly and the second not at all. A pump running on a petrol blend is wearing itself out, because petrol is runnier than diesel and takes away the protection your fuel system depends on. Petrol is also made to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that's where the knocking comes.
Put these together and the shape of the problem is plain. Contact does not do the harm — movement does. All a tank with petrol in it amounts to is a fuel fault. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with your fuel to your injectors further on.
Four scenarios our technicians see in Upper Dicker: how serious is petrol in a diesel?
The best case there can be: filled up, never started. On a forecourt, and really only there, that petrol is still confined to your tank — because everywhere else the car was driven to reach it. The job is draining and flushing on the spot.
A moment's running, or just the ignition on. The fuel system has been primed, so petrol has left the tank and got to the fuel filter and your lines. That is usually still a simple task — a drain, a flush, and your filter dealt with.
Those few miles driven were the pump labouring on fuel weakened by petrol the whole way. The work is the tank, your lines, the fuel filter and clean fuel through the whole system, and how hard the car was driven counts as much as how far. The school run to Park Mead Primary School is one matter. A run as far as Brighton and Hove, under 25 miles away, is a very different job. So is any mileage on the M23, under 25 miles from Upper Dicker, where the motor has been running hard throughout.
Driven till it protested. Clattering, a ragged idle, smoke, a throttle that has gone soft. The engine is telling you your fuel is no longer behaving like diesel. Leave it wherever it stops: a lay-by, a quiet street, the verge on Coldharbour Road. A car pulled over early very rarely has long-term damage, as the fuel drain and the flush, which still go first, take care of it.
Upper Dicker drivers and the petrol in a diesel myths they hear
False: topping up to full with diesel makes it fine. It doesn't. Nothing is removed when you top up — the tank just carries more of the same blend. A diesel fuel system does not tolerate petrol by percentage in the way that guidance assumes.
Not so: a current diesel copes with a bit of petrol. Rather, the reverse. A newer diesel sends its fuel through more precise components at higher pressure, which makes the protection matter more, not less.
"It starts, it drives, and so no harm done" — the myth that trips up more people than any other. Diesel in a petrol motor usually leaves a motor that will not run: the motorist stops, and so does the damage. Feed petrol to a diesel and it normally fires up, ticks over and pulls away like nothing happened — all while its pump is wearing. Fine and running are not the same thing.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct issue. None of what petrol diluted is put back by it — and afterwards, that tank still holds that petrol.
"Drain it yourself and you are sorted" — a myth, because after it's been running some petrol lies in your filter and lines, waiting to go straight back through your pump at your next start. Clearing petrol into a can by the roadside is also really risky.
Petrol in a diesel: how does it take place?
On purpose? Never. Through carelessness? Seldom, if ever. One way only, since of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, while the diesel one generally will not fit a petrol motor. That's how the forecourt makes it easy.
When habit and your car stop matching, it occurs. Hire cars, courtesy cars, and vehicles that are new to you. Households running one of each, petrol and diesel. A well-known forecourt with the pumps in a different order. Rushing for a train at Berwick (Sussex) and filling up en route. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: precisely when it takes place. Throw in a back seat full of children, a phone call or rain, and the hand wins.
How to prevent petrol in a diesel at your next fill-up around Upper Dicker
- A green handle for unleaded and black for diesel is normal in the UK — but not on each forecourt. Trust the label on the petrol pump, not the colour.
- The first fill in an unfamiliar car is the time to check your filler flap — on it, or on the cap, many cars state the fuel to use.
- One of each in the house? Label your key to the diesel — a coloured fob, a sticker — because meaning to remember isn't enough.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the petrol pump. It sounds daft and it does the trick.
- Mistakes like this are easy to make whilst 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 designed to reject a petrol nozzle, and add-on devices are available for motors without one. They are a safety net, not a reason to stop checking the pump.
- Spotting it halfway? Stop there and then. A weaker blend follows from less petrol in that tank, but your next stage stays the same: don't crank it.
Upper Dicker: already put petrol in a diesel?
Short and simple, then, is the order of things. Leave it unstarted, with the ignition switched off as well. Ask the attendants to help you push it away from the pump if you are still at the forecourt, whether that is Shell or anywhere else. Next, 0333 366 0103. We'll ask what got in, about how much, and if it's been run.
Corrosion and deposits are the issue with AdBlue, whereas petrol means lost lubrication. So if it was AdBlue, say so — and read its own Upper Dicker page.
One petrol in a diesel task in Upper Dicker costs more than another. Why?
An honest single quote doesn't exist here: four situations, four separate tasks. Chiefly, the cost shifts with which one you are in. Two things come after that: the petrol that was put in as a proportion of what that tank takes, then the place your car is in and whether a van can get to it safely.
What was put in, how much, and if it's run — three questions we ask before quoting, not after, for precisely that reason. Those replies are what turn a range into one firm number.
About Upper Dicker
Upper Dicker is a small village in East Sussex, situated near the River Cuckmere and surrounded by rolling countryside. Upper Dicker has a population of around 599 people and is characterized by its predominantly detached housing stock. Upper Dicker sits at an elevation of 21 metres, close to the villages of Wickstreet, Lower Dicker, and Tile Hurst, and is within commuting distance of Brighton and Hove.
Upper Dicker and East Sussex: where our fuel drain cover runs
Our vans answering petrol in diesel call-outs around Upper Dicker, in the BN postcode area, also work the spots around it, Wickstreet, Lower Dicker and Tile Hurst among them. The vehicle does not need to move to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
Still at the petrol pump around Upper Dicker?
No position is better: that is where you now are. Keep the vehicle turned off, then ring.