Petrol in a Diesel Car in Jarvis Brook: How Worried Should You Be?
Not started? Then less worried than you likely feel. Till the ignition primes the pump, your starter cranks, or your vehicle is driven, petrol in a diesel tank just waits there and does nothing. Which means the honest reply to that first Jarvis Brook query — "have I wrecked it?" — usually no. Keep it like that: leave your motor off then phone Petrol in Diesel. 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 again.
Petrol in a diesel: what does it do to the motor?
Passing through a motor, diesel is doing two things at the same time. It protects first, and only then does it burn. What stops the surfaces inside the high-pressure fuel pump and the fuel injectors from wearing down against one another is your diesel passing through them — they are built to very fine clearances.
Badly at the first, not at all at the second: that is petrol. A pump running on a petrol mixture is wearing itself out, since petrol is thinner than diesel and strips out the lubrication your fuel system depends on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that's where the knocking comes.
Combined, those make the shape of the problem plain. Not contact but circulation is what does the harm. All a tank with petrol in it amounts to is a fuel fault. Whatever a worn pump sheds goes on, carried by the fuel, into your injectors downstream, which is why a pump that has been working on the petrol is where a mechanical issue starts.
Petrol in a diesel in Jarvis Brook: how serious is it? Four situations
Fuelled up, not once started. The best case there is. That petrol is inside that tank and just the tank, and the job is a drain and a flush where the car sits. This is the one scenario that can only truly happen on a forecourt, as anywhere else your car has been driven to get there.
A moment's running, or just your ignition on. Once primed, the system has drawn petrol from the tank as far as the filter and the fuel lines. Still generally simple: drain, flush, and your filter sorted.
A couple of miles driven, and your pump has spent every one of them labouring on weakened fuel. Distance is only half of that; how hard it was driven matters just as much. Either way this work runs to that tank, the lines, the filter and clean fuel through the whole system. Driving the kids to Jarvis Brook Primary School is one sort of trip. Any distance on the M23, under 15 miles from Jarvis Brook, means the motor working hard throughout, and a run to Brighton and Hove, under 25 miles away, makes a very different job too.
Driven till it complained. Rattling, a lumpy idle, smoke, a throttle that has gone soft. The engine is telling you the fuel is no longer behaving like diesel. Leave it wherever it stops: a lay-by, a quiet street, the verge on Knowle Close. Permanent damage is very uncommon if a car is stopped quickly, and the drain and flush that still go first sort it out.
Myths Jarvis Brook motorists hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. A bigger tank of the same mixture is all it gives, because topping up removes nothing. A diesel fuel system doesn't tolerate petrol by percentage in the way that advice assumes.
If anything, the opposite is true. Myth: "A newer diesel can cope with a bit of petrol." A current diesel sends its fuel through finer parts at higher pressure, which makes the protection count more, not less.
The myth that catches people out: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it generally won't run, so the driver stops — and the harm stops with them. A diesel fed petrol normally starts, idles and drives away as if nothing has happened, while your pump wears. Running does not mean fine.
An old fix for a different fault lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." None of what petrol thinned is put back by it — and afterwards, your tank still holds that petrol.
Once the motor has run, part of the petrol sits in your filter and the fuel lines, not your tank — and your next start pulls it right back through your pump. So the myth "drain that tank yourself and you are sorted" does not stand up. It is also genuinely risky to drain petrol into a can at the roadside.
Petrol in a diesel: how does it occur?
No one does it on purpose, and it's seldom carelessness. 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 won't fit a petrol car. That's how the forecourt makes it straightforward.
The moment habit stops matching your car is the moment it happens. Hire cars, courtesy cars, and motors that are new to you. A household with one petrol and one diesel on the drive. A forecourt you know, only with its pumps arranged differently. Fuelling up in a hurry en route to Crowborough, with a train to catch. Exactly the moment it takes place: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of kids.
Jarvis Brook people: how to avoid petrol in a diesel next time
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most usually do. Check the pump's label; the colour is just a clue.
- In a car you do not know, look inside the flap over your filler or at the cap before the first fill: many cars state the fuel there.
- A coloured fob or a sticker on the diesel's key does more than any amount of intending to remember, for a house with one of each.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump. It seems daft and it does the trick.
- Whilst you are thinking about something else, this is an easy mistake to make — so tuck your phone away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to block 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.
- The moment you notice, stop: less petrol inside the tank means a thinner blend. What to do next does not change, though — still don't crank it.
Jarvis Brook: already put petrol in a diesel?
In that case, there is just a short order of things. Leave it unstarted, with your ignition switched off too. Ask the staff to help you push it clear of the pump if you're still at the forecourt, whether that is BP or anywhere else. Then ring 0333 366 0103 and tell us what was put in, about how much, and whether it's run.
Say so if it was AdBlue instead of petrol: it's a different problem, with its own page for Jarvis Brook, because AdBlue brings corrosion and deposits rather than lost lubrication.
Why one petrol in a diesel task in Jarvis Brook costs more than another
There is no honest single quote for this, since the four scenarios above are four different jobs. Chiefly, your cost moves with which one you are in. Where the car is matters too, and whether a van can safely reach it, after the proportion of petrol to what the tank takes.
That's why we ask three questions before pricing rather than after: what got in, how much, and if it has run. Their answers are what change a range into one firm number.
About Jarvis Brook and where it is
Jarvis Brook is a suburban area in East Sussex, situated on the banks of a river at an elevation of 117 metres. Jarvis Brook lies within commuting distance of London, approximately 34.8 miles away, and is also close to the city of Brighton and Hove, about 21 miles away. Jarvis Brook is characterised by its semi-detached housing and is surrounded by nearby places such as Blackness, Alderbrook, and Poundfield.
Fuel drain cover across East Sussex, Jarvis Brook included
Jarvis Brook rests in the TN postcode area, and the vans that answer petrol in diesel jobs there work the spots near it as well — Blackness, Alderbrook and Poundfield among them. No need to bring your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots we drain.
Still at the petrol pump around Jarvis Brook?
Then you're in the best spot there is. Keep the vehicle turned off, then ring.