Petrol in a Diesel Car in Bowmans: How Worried Should You Be?
Unstarted? Then less worried than you likely feel. "Have I ruined it?" is the first question anyone around Bowmans asks, and the honest answer is generally no, because petrol resting in a diesel tank harms nothing till it's drawn through the system — by ignition priming, by the starter, or by being driven. Petrol in Diesel is who to phone, with the engine kept off, and so it remains that way. The rest of this page sets out what petrol really does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you a second time.
Petrol in a diesel: what does it do to the motor?
Two tasks fall to diesel on its journey round a motor. Lubricating comes before burning; it does both. Made to extremely fine tolerances, the injectors and the pump rely on the diesel flowing through them to keep their surfaces from wearing against one another.
Of those two jobs, petrol manages the first badly and the second never. The rattling comes from petrol being made 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 hinges on, and any pump working on such a mixture is wearing itself.
Combined, those leave the shape of the issue plain. Contact does not do the damage — movement does. A tank with petrol in it is a fuel issue. A pump that has been working on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with your fuel to your injectors downstream.
Petrol in a diesel in Bowmans: how bad is it? Four situations
The best case there can be: filled up, never started. At a forecourt, and genuinely only there, that petrol is still confined to the tank — because everywhere else the car was driven to get to it. The job is draining and purging on the spot.
Your ignition switched on, or a short start. With the fuel system primed, the fuel lines and filter now hold petrol that has come from that tank. Usually nothing more than emptying, cleaning and seeing to the filter, and so still straightforward.
The pump has worked a few miles on thinned fuel — that's what driving the car does. Miles is only half of that; how hard it was driven matters just as much. Either way this work includes the tank, the fuel lines, the filter and clean fuel through the entire system. Short trips, such as the school run to Wentworth Primary School, are one matter. Very different again: a run to London, under 15 miles away, or some miles on the M25, under 3 miles from Bowmans, where the motor never stopped working hard.
Rattling, a ragged idle, smoke, a throttle gone soft: driven till it complained. That's the engine telling you its fuel no longer is behaving like diesel. Pull up wherever you are — the verge on Rochester Way, a lay-by, a side street — and leave it there. A vehicle stopped soon very rarely has permanent damage, as the fuel drain and the flush, which still come first, deal with it.
Petrol in a diesel stories Bowmans motorists hear
"Top it up the rest of the way with diesel and it will be fine" — a myth. It will not. Nothing is removed by topping up — you are left with a fuller tank, still the same mix. Percentage is not how a diesel fuel system tolerates petrol, whatever that guidance presumes.
If anything, the opposite is true. Myth: "A modern diesel can cope with a bit of petrol." A newer diesel runs its fuel through more precise parts at higher pressure, which makes the lubrication matter more, not less.
"It starts, it drives, so no harm done" — the myth that catches more motorists than any other. Feed diesel to a petrol motor and it generally will not 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. A running engine doesn't mean fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a distinct fault. What petrol has thinned stays weakened, and that petrol remains inside your tank regardless.
Once the motor has been run, part of that petrol sits in your filter and the fuel lines, not the tank — and the next start pulls it right back through the pump. So the myth "drain that tank yourself and you're sorted" does not hold. And, a can of petrol drained at the roadside is genuinely hazardous.
How it happens: petrol in a diesel
It is seldom carelessness, and nobody does it on purpose. 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, whilst a diesel nozzle mostly won't go into a petrol car at all. So the error runs one way.
Routine and the car getting out of step is when it occurs. Any motor that's new to you — a hire car, on loan as a courtesy car, or brand new. Two cars on one driveway, one petrol, one diesel. Your ordinary forecourt, its pumps now in a different order. Filling up in a rush on the way to Crayford, with a train to catch. A new-to-you diesel Volkswagen Passat, its first fuelling, and a driver used to petrol: precisely when it occurs. Throw in a back seat full of children, a phone call or rain, and habit takes over.
Bowmans motorists: how to avoid petrol in a diesel next time
- Green for unleaded and black for diesel is usual in the UK — yet not on every forecourt. Trust the label on the pump, not the colour.
- Plenty of cars state the fuel type inside the filler flap or on the cap, and so check there on the first fill in a vehicle you don't know.
- One of each in the house? Mark your key to your diesel — a coloured fob, a sticker — since intending to remember is not enough.
- It seems silly and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, so put the phone away then keep your mind on the petrol pump.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to refuse a petrol nozzle, and add-on devices are available for the rest. Treat it as a backstop, and keep checking the petrol pump.
- Noticing it mid-fill? Stop at once. A weaker blend results from less petrol inside your tank, yet the next step remains the same: don't crank it.
Already put petrol in a diesel around Bowmans?
In that case, there is just a short order of things. Leave it unstarted, with the ignition off as well. The staff at the forecourt — whether at Esso itself or wherever you filled up — will usually help push it away from the petrol pump if you ask. What went in, about how much, and if it has run: tell us those when you call 0333 366 0103.
Corrosion and deposits are the trouble with AdBlue, whereas petrol means lost protection. So if it was AdBlue, say so — and see its own Bowmans page.
Why one petrol in a diesel job around Bowmans costs more than another
Four separate tasks lie behind the four scenarios above — which is why there's no honest single quote. What moves the cost is chiefly which of them you are in. After that it is the share — how much petrol got in against how much the tank takes — and after that where your car is and whether a technician can reach it safely.
Three questions come first, before quoting, instead of after — what was put in, how much, has it run — and that is the reason. The answers turn a range into a straight figure.
About Bowmans, briefly
Bowmans is a suburban area in Kent, situated inland at an elevation of 44 metres, and is located approximately 14.1 miles from central London. Bowmans forms part of the wider residential area surrounding London, with nearby places including Heath Side, Maypole, and Coldblow. Bowmans has a population of around 1730 people, predominantly living in semi-detached housing.
Across Kent and in Bowmans: fuel drain cover
Bowmans waits in the DA postcode area, and the teams that answer petrol in diesel calls there work the places around it as well — Heath Side, Maypole and Coldblow among them. You need not bring your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places we drain.
At the pump around Bowmans, right now?
The best place there is, then — that is where you are. Keep it off. Ring.