Petrol in a Diesel Car in Peacemarsh: How Worried Should You Be?
Far less than you likely are, provided it has not been started. Everyone in Peacemarsh starts with "have I ruined it?", and the fair answer is normally no: petrol resting in your tank of any diesel remains harmless until priming, cranking or driving draws it into the system. Petrol in Diesel is who to call, with the engine left off, so it remains that way. Keep reading for three things: the effect petrol has inside a diesel engine, the signs of how far it has spread, and the way to make sure you don't do it again.
The motor and petrol in a diesel: what happens
Two jobs fall to diesel on its route round a motor. Lubricating comes before burning; it does both. Very fine tolerances are built into the fuel injectors and the high-pressure pump, and only your diesel flowing through stops their surfaces grinding together.
The second job petrol does not do at all, and the first it does poorly. It's runnier than diesel and removes the protection your fuel system depends 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 reverse of what a diesel needs from its fuel. That's where the knocking comes from.
Put those together and the shape of the trouble is clear. The harm is done by movement, not by contact. Petrol in the tank is a fuel issue. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with the fuel to your injectors downstream.
Petrol in a diesel in Peacemarsh: how bad is it? Four situations
Fuelled up, never started. The best case there is. That petrol is in the tank and only your tank, and the job is a drain and a flush where the car sits. This is the one scenario that can only really occur at a forecourt, because anywhere else the car has been driven to get there.
A brief spell of running, or just your ignition on. The fuel system has been primed, and so petrol has left your tank and reached the filter and the lines. Still generally straightforward: drain, flush, and the filter seen to.
Those few miles driven were the pump running on fuel thinned by petrol the whole way. Miles is only half of it; how hard it was driven matters just as much. Either way this work includes the tank, your lines, the fuel filter and clean fuel through the entire system. On the school run to Gillingham Primary School, the miles is small. Driving as far as Wells, under 25 miles away, makes a very different task — as does any mileage on the M5, under 50 miles from Peacemarsh, with your engine running hard all the way.
Driven until it protested. Rattling, an uneven idle, smoke, a throttle that has gone soft. The fuel isn't acting like diesel any more, and the engine is saying so. Pull up wherever you are — the verge on Dolphin Lane, a lay-by, a side street — then leave the car there. What goes first is still the drain and flush, and that sorts it out, with lasting damage very unusual if a vehicle is pulled over soon.
Peacemarsh drivers and the petrol in a diesel stories they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing is removed by topping up — you're left with a bigger tank, still the same mix. A diesel fuel system doesn't tolerate petrol by percentage in the way that guidance assumes.
Myth: a modern diesel copes with a bit of petrol. Rather, the opposite. Smaller components and higher pressure are how a newer diesel runs its fuel, and that makes the protection matter more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that catches motorists. Diesel in a petrol motor generally leaves a motor that will not run: the driver stops, and so does the damage. Whilst the pump grinds, a diesel fed petrol normally starts, idles and drives away as though nothing has happened. Fine and running are not the same at all.
An old workaround for a distinct fault lies behind this one. Myth: "Add some two-stroke oil and drive the car home." The petrol is still in the tank afterwards, and whatever it has weakened isn't put back.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol sits in the filter and lines, waiting to go right back through your pump at the next start. It's also really risky to drain petrol into a can by the kerbside.
Why petrol in a diesel happens at all
A careless moment is seldom the cause, and no one means to do it. One way only, because of the nozzles: the narrower petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol vehicle. That's how the forecourt makes it straightforward.
Habit and the vehicle falling out of step is when it happens. Hire cars, courtesy cars, and vehicles that are new to you. Two motors on one drive, one petrol, one diesel. A forecourt you know, but with its pumps laid out differently. A hurried fill en route to Gillingham (Dorset) with a train to catch. Years of petrol vehicles behind you, a diesel Volkswagen Passat in front of you on the forecourt for its first tank — that is when. Add a back seat full of kids, a phone call or rain, and habit wins.
How to avoid petrol in a diesel on your next fill-up in Peacemarsh
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Check the pump's label; the colour is only a clue.
- The first fill in a new car is the time to check the filler flap — on it, or on the cap, many vehicles state which fuel to use.
- One of each in the household? Label the key to the diesel — a bright fob, a sticker — because intending to remember isn't enough.
- Before the nozzle comes off the petrol pump the first time you fill a hired or new motor, say "diesel" aloud. Silly, perhaps, but it does the trick.
- Mistakes like this are simple 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 come with a filler designed 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.
- Less petrol makes a thinner blend, and so stop as soon as you realise — though remembering that your next stage is unchanged. It's still not to start it.
Petrol already in a diesel around Peacemarsh? Begin here
Short and simple, then, is the order of things. Don't turn the ignition on, and do not fire it up. The attendants on the forecourt — whether at Esso itself or wherever you filled up — will normally help push it clear of the petrol pump if you ask. What got in, about how much, and if it's run: tell us those when you ring 0333 366 0103.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a separate issue — Peacemarsh has a page just for it.
Why one petrol in a diesel job around Peacemarsh costs more than another
The four scenarios above are four different jobs, so no single price for this would be fair. The scenario itself does most of the work of moving the cost. After that it's the proportion — how much petrol went in against how much that tank takes — and after that where your car is and whether a van can reach it safely.
Three queries come first, before quoting, rather than after — what was put in, how much, has it run — and that is the reason. A range turns into a straight figure when the replies are in.
About Peacemarsh, for a moment
Peacemarsh is a suburban area situated on the riverside in Dorset, with a mix of semi-detached housing and a population of around 2889 residents. Peacemarsh sits at an elevation of 82 metres, near the villages of Colesbrook, Lodbourne, and Cold Harbour. Peacemarsh is located approximately 19 miles from the city of Wells and about 98 miles from London, making it a relatively rural suburb in the South West region. Peacemarsh has a quiet, residential character, typical of many suburban areas in the county.
Fuel drain cover in Peacemarsh and across Dorset
Our teams answering petrol in diesel call-outs in Peacemarsh, in the SP postcode area, equally work the locations around it, Colesbrook, Lodbourne and Cold Harbour included. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations we work, and your car does not need to come to us.
Peacemarsh: still at the pump?
No position is better: that's where you now are. Turned off it remains; then call.