Southborough: Petrol in a Diesel Car? How Worried to Be
Unstarted? Then less anxious than you likely feel. Petrol resting in a diesel tank does nothing to your motor until something draws it through the system — your ignition priming the pump, your starter, or the drive itself. So the truthful answer to the first question anyone around Southborough asks, "have I ruined it?", is generally no. To leave it that way, call Petrol in Diesel and leave the engine alone. Further down, you will find what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you again.
Inside your engine: what petrol in a diesel does
On its way through an engine, diesel has two jobs. It lubricates to begin with, and after that does it burn. Built to very fine clearances, the injectors and your pump depend on your diesel flowing through them to stop their surfaces wearing against one another.
The second task petrol does not do at all, and the first it does poorly. The clattering comes from petrol being designed not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips away the protection your system hinges on, and any pump working on such a blend is wearing itself.
Put those together and the shape of the trouble is plain. The damage is done by circulation, not by contact. A tank with petrol in it is a fuel fault. The beginning of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with the fuel to your injectors downstream.
Petrol in a diesel around Southborough: how serious is it? Four cases
Fuelled up, not once started. The best case there can be. Being at a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With the petrol held inside that tank alone, it's cleared and rinsed right where it stands, and nothing more is needed.
A brief spell of running, or merely your ignition on. Petrol has come out of your tank and got to the filter and your lines, because the fuel system has been primed. That is generally still an easy job — a drain, a flush, and the fuel filter seen to.
A few miles driven, and the pump has spent each of them labouring on thinned fuel. Miles is only half of it; how hard it was driven counts equally. Either way this work runs to the tank, the lines, your filter and fresh fuel through the entire system. Short trips, such as the school run to Southborough Primary School, are one thing. Driving as far as London, under 15 miles away, makes a very different task — as does any miles on the M25, under 5 miles from Southborough, with the motor labouring hard the whole time.
Rattling, a lumpy idle, smoke, a throttle gone soft: driven till it complained. That's your motor telling you its fuel no longer is acting like diesel. Stop wherever you are — the verge on The Fairway, a lay-by, a side street — and leave it where it is. A vehicle pulled over early very rarely has permanent damage, since the fuel drain and the flush-through, which still come first, deal with it.
Southborough people and that petrol in a diesel myths they hear
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing is removed when you top up — the tank just holds more of the same blend. A diesel fuel system doesn't accept petrol by percentage in the way that guidance assumes.
Not so: a modern diesel copes with a bit of petrol. Rather, the reverse. Smaller parts and higher pressure are how a newer diesel runs its fuel, and that makes the lubrication count more, not less.
One 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 motorist stops — and the harm stops with them. Feed petrol to a diesel and it usually fires up, ticks over and drives away as if nothing happened — all the while its pump is wearing. Running is not the same as fine.
An old workaround for a different issue lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." What petrol has diluted remains weakened, and that petrol stays inside your tank anyway.
Myth: "Drain that tank yourself and you're sorted." After the engine has been run, some of that petrol is no longer inside the tank: it is in the filter and the lines, and it goes right back through your pump on the next start. Also, a can of petrol filled by the roadside is genuinely hazardous.
How petrol ends up: petrol in a diesel
It is rarely carelessness, and nobody does it on purpose. The forecourt makes it simple: the petrol nozzle is the smaller of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle mostly won't go into a petrol motor at all. So the mistake runs one way.
It happens when routine and the vehicle stop matching. Courtesy car, hire car, or a motor that's brand new. One petrol and one diesel on the drive of the same household. Your ordinary forecourt, its pumps now in a different order. A train to catch, and a rushed fill on the way to Bickley. Years of petrol vehicles behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that is when. The hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
How to prevent petrol in a diesel at your next fill-up in Southborough
- Green for unleaded and black for diesel is usual in the UK — but not on every forecourt. Go by the label on the petrol pump, not the colour.
- Inspect the filler flap. Plenty of motors state the fuel inside the flap or on the cap. Look at it on your first fill in a motor you don't know.
- Good intentions count for less than a sticker or a fob in a vivid colour on the diesel's key when a home has one of each. So mark it.
- Before the nozzle comes off the pump the first time you fuel a hired or new vehicle, say "diesel" out loud. Silly, yes, but it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, so tuck your phone away then keep your mind on the pump.
- Some diesels have a filler designed to refuse a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the pump.
- Less petrol means a weaker mixture, so stop the moment you realise — though remembering that the next step is unchanged. It's still not to fire it up.
Already put petrol in a diesel around Southborough?
In that case, there's just a short order of things. Leave it unstarted, with the ignition off too. The staff on the forecourt — whether at Harvest Energy itself or wherever you filled up — will usually help roll it away from the petrol pump if you ask. Ring 0333 366 0103 next, with three facts — the fuel, the rough amount, and if it's run.
Corrosion and deposits are the issue with AdBlue, whereas petrol means lost lubrication. So if it was AdBlue, say so — and see its own Southborough page.
One petrol in a diesel job in Southborough costs more than another. Why?
An honest single price does not exist here: four situations, four separate jobs. The scenario itself does most of the work of moving your cost. Two things come after that: the petrol that went in as a share of what your tank holds, then the place the vehicle is in and whether a technician can get to it safely.
Ahead of any quote, not after, come three queries: the fuel that went in, its volume, and whether it's run. That is why. With those replies, there is a straight figure instead of a range.
About Southborough itself
Southborough is a suburban area in Greater London, situated approximately 11 miles southeast of central London. Southborough sits at an elevation of around 66 metres, near the towns of Bromley Common and Bickley. Southborough is characterized by its predominantly semi-detached housing stock, which reflects the typical residential development of the area. Southborough is also close to Petts Wood, a nearby wooded area.
Fuel drain cover around Southborough and across Greater London
Petrol in diesel call-outs in Southborough — part of the BR postcode area — go to teams that also cover the locations around it, Bromley Common, Bickley and Petts Wood among them. The car does not need to come to us: our engineers drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the petrol pump in Southborough?
Then, you could not be in a better place. Call, and leave it switched off.