How Worried Should You Be? Petrol in a Diesel Car in Roundshaw
Unstarted? Then less anxious than you likely feel. Everyone around Roundshaw begins with "have I wrecked it?", and the honest answer is generally no: petrol resting inside that tank of any diesel remains harmless till priming, cranking or driving pulls it into your fuel system. Petrol in Diesel is who to phone, with the motor kept off, and so it stays that way. Keep reading for three things: the effect petrol has inside a diesel motor, the signs of how far it has got, and the way to make sure you never repeat it.
What petrol in a diesel does to the engine
On its way through an engine, diesel has two jobs. Before it burns, it protects — then it combusts. Built to extremely fine tolerances, the fuel injectors and your pump rely on your diesel moving through them to keep their surfaces from wearing against one another.
The second task petrol doesn't do at all, and the first it does poorly. The knocking comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips away the lubrication the fuel system rests on, and any pump running on such a mixture is wearing itself.
Combined, those leave the shape of the trouble plain. Contact does not do the damage — circulation does. All a tank with petrol in it amounts to is a fuel problem. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with the fuel to the injectors further on.
Roundshaw, petrol in a diesel: four cases, from mild to significant
The best case there can be: filled up, never started. At a forecourt, and truly only there, that petrol is still confined to your tank — since everywhere else the car was driven to reach it. The job is emptying and flushing on the spot.
The ignition switched on, or a short start. Petrol has left the tank and got to the fuel filter and the lines, since your system has been bled. That's usually still an easy job — a drain, a flush, and the filter seen to.
Driven a couple of miles. Now the pump has spent these miles running on diluted fuel. Miles is only half of that; how hard it was driven counts equally. Either way the work includes the tank, the fuel lines, your filter and clean fuel through the whole circuit. On the school run to Wallington Primary Academy, the mileage is small. Driving as far as Westminster, under 15 miles away, makes a very different job — as does any miles on the M23, under 5 miles from Roundshaw, with your engine working hard the whole time.
Driven till it protested. Rattling, a ragged idle, smoke, a throttle that has gone soft. What you are hearing is your motor signalling fuel that no longer acts like diesel. Stop on the spot — on the verge on Vanguard Way, at the kerb, down a side road — and don't move it. What goes first is still the drain and flush-through, and that deals with it, with lasting damage very unusual when a vehicle is stopped soon.
Roundshaw drivers and the petrol in a diesel stories 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 simply carries more of the same blend. Percentage is not how a diesel fuel system copes with petrol, whatever that advice presumes.
Myth: a modern diesel copes with a bit of petrol. Rather, the opposite. Protection counts more on modern diesels, not less, because their fuel runs through more precise parts at higher pressure.
The myth that catches drivers off guard: if it starts and drives, it must be unharmed. Diesel in a petrol motor normally leaves a motor that won't run: the motorist stops, and so does the harm. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile your pump grinds. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive the car home." It is an old workaround for a different issue. That petrol is still in that tank after that, and whatever it has weakened is not put back.
Myth: "Drain your tank yourself and you are sorted." Once the engine has been run, some of the petrol is no longer in that tank: it is in the fuel filter and the fuel lines, and it goes right back through your pump on the next start. Also, a can of petrol filled at the kerbside is truly dangerous.
Petrol in a diesel: how does it happen?
Carelessness is seldom the cause, and nobody means to do it. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol car at all. The forecourt makes it simple, and the slip runs one way.
When routine and the vehicle stop matching, it takes place. A motor that is new to you — hired, on loan as a courtesy car, or brand new. One petrol and one diesel on the driveway of the same household. A well-known forecourt with the pumps in a different order. A train to catch, and a rushed fill en route to Wallington. Precisely the moment it occurs: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Throw in rain, a phone call or a back seat full of kids, and your hand does what it has always done.
Next time you fill up around Roundshaw: preventing petrol in a diesel
- Check the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on every forecourt. The label is what matters.
- In a motor you don't know, look inside the flap over the filler or at the cap before your first fill: plenty of cars print the fuel there.
- One of each in the house? Label your key to the diesel — a coloured fob, a sticker — since meaning to remember isn't enough.
- It seems silly and it works: on your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump.
- Put the phone away. This is an easy mistake to make while you are thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to reject a petrol nozzle, and add-on devices exist for the remainder. Count it as a safety net, and keep checking the petrol pump.
- As soon as you notice, stop: less petrol in the tank means a weaker blend. What to do next doesn't change, though — still do not fire it up.
Already put petrol in a diesel in Roundshaw?
Short and simple, then, is the order of things. Do not crank it, and don't turn the ignition on. Still on the forecourt, at Texaco or anywhere else? Ask the attendants to help you push it clear of the petrol pump. Then call 0333 366 0103 and tell us what went in, about how much, and whether it has run.
Say so if it was AdBlue instead of petrol: it's a separate fault, with its own page for Roundshaw, because AdBlue brings corrosion and deposits instead of lost protection.
What makes one Roundshaw petrol in a diesel task cost more than the next
The four situations above are four different jobs, so no single price for this would be honest. The situation itself does most of the work of moving your cost. Next it is the proportion — how much petrol went in against how much your tank takes — and after that where the vehicle is and whether our van can get to it safely.
Before any quote, not after, come three questions: the fuel that was put in, the volume, and if it's run. That's why. Those replies are what turn a range into one firm number.
About Roundshaw, briefly
Roundshaw is a suburban area in south London, situated approximately 10.7 miles from central London and 10.2 miles from Westminster. Roundshaw sits at an elevation of around 75 metres, with its predominant housing stock consisting of flats. Roundshaw is located near other suburban areas such as South Beddington, Russell Hill, and Bandonhill, and has a population of around 8035 residents.
Fuel drain cover around Roundshaw and across Greater London
The vans answering petrol in diesel jobs around Roundshaw, in the SM postcode area, also work the spots near it, South Beddington, Russell Hill and Bandonhill among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations our engineers work, and the car does not need to come to us.
Roundshaw: still at the pump?
No position is better: that's where you are. Switched off it remains; then call.