Lower Clough: Petrol in a Diesel Car? How Worried to Be
Probably less than you are now — provided nobody has started it. Everyone around Lower Clough starts with "have I wrecked it?", and the fair answer is normally no: petrol resting in the tank of a diesel remains harmless until priming, cranking or driving pulls it into the fuel system. To keep the vehicle like that, ring Petrol in Diesel and leave the engine switched off. The rest of this page explains what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you a second time.
Inside the motor: what petrol in a diesel really does
Two jobs fall to diesel on its journey round a motor. Oiling comes before burning; it does both. What keeps the surfaces inside the high-pressure pump and the injectors from wearing against each other is your diesel flowing through them — they are designed to very fine tolerances.
Of those two jobs, petrol handles the first badly and the second never. Being less viscous than diesel, petrol strips out the protection a fuel system needs, so a pump on the mixture to wear itself. It's equally made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the clattering.
Put those together and the shape of the trouble is plain. It is circulation that causes the harm, not contact. Petrol in a tank is a fuel fault. A pump that has been running on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with the fuel to the fuel injectors further on.
Petrol in a diesel around Lower Clough: how serious is it? Four cases
Fuelled but not once started — the best it gets. Being at a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With that petrol kept inside that tank alone, it's cleared and cleaned on the spot, and nothing more is needed.
The ignition switched on, or a brief start. With the fuel system primed, your lines and filter already hold petrol that has come from the tank. Normally little more than clearing, flushing and seeing to the filter, and so still easy.
Those few miles driven were the pump labouring on fuel thinned by petrol the whole way. How hard your car was driven counts as much as how far, and the work covers your tank, your lines, the fuel filter and fresh fuel through the whole circuit. On the school run to Linthwaite Clough Primary School, the mileage is small. Very different a second time: a run to Bradford, under 15 miles away, or any mileage on the M62, under 3 miles from Lower Clough, where the motor never stopped labouring hard.
It complained, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone lumpy. The motor is telling you the fuel is no longer acting like diesel. Whether it's the verge on Waingate Park, a lay-by or a side street, stop there and leave it. A car stopped quickly very rarely has long-term damage, since the fuel drain and the flush-through, which still come first, sort it out.
Lower Clough motorists and the petrol in a diesel myths they hear
Myth: topping up to full with diesel makes it fine. It doesn't. Topping up removes nothing; it gives you a fuller tank of the same mixture. That guidance supposes a diesel fuel system tolerates petrol by percentage. It does not.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. A modern diesel sends its fuel through finer parts at higher pressure, which makes the lubrication matter more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that fools people. Feed diesel to a petrol engine and it normally won't run, and so the motorist stops — and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile the pump grinds. Running is not the same as fine.
An outdated workaround for a separate fault lies behind this one. Myth: "Add some two-stroke oil and drive the car home." What petrol has weakened remains weakened, and that petrol stays inside that tank regardless.
The next start draws petrol back round your pump out of the fuel lines and the fuel filter, where some of that ends up after the motor has run. That's why draining the tank yourself doesn't sort it — a myth. Besides, petrol emptied into a can by the road is truly risky.
Why petrol in a diesel happens so easily
No one does it on purpose, and it's seldom carelessness. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol motor at all. The forecourt makes it easy, and the slip runs one way.
Habit and the car falling out of step is when it takes place. A car 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. A rushed fill on the way to Slaithwaite with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: exactly when it happens. With rain, a call coming in, or children to deal with, your hand simply does what it has always done.
How to prevent petrol in a diesel on your next fill-up around Lower Clough
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most usually do. Check the pump's label; the colour is only a hint.
- The first fill in a new car is the time to check the filler flap — on it, or on the cap, many cars state which fuel they take.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of meaning to remember, for a house with one of each.
- It sounds silly and it works: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Mistakes like this are straightforward to make whilst your mind is on something else, so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to reject a petrol nozzle, and add-on devices are available for the rest. Treat it as a backstop, and keep reading the petrol pump.
- Stop the moment you notice. Less petrol inside that tank means a weaker mix. It doesn't change what to do next, which is still not to start it.
Petrol already in a diesel around Lower Clough? Begin here
In that case, there's only a short order of things. Do not fire it up, and don't switch the ignition on. Still at the forecourt, at the nearest petrol station or anywhere else? Ask the attendants to help you roll it away from the pump. Call 0333 366 0103 next, with three facts — the fuel, the rough quantity, and if it has run.
Say so if it was AdBlue rather than petrol: it's a different fault, with its own page for Lower Clough, since AdBlue brings corrosion and deposits rather than lost protection.
Lower Clough petrol in a diesel tasks: why one costs more than another
Four separate tasks lie behind the four scenarios above — which is why there is no fair single price. What moves the cost is chiefly which of them you are in. The ratio counts next, meaning how much of the tank is petrol, and then the position of your car and whether getting to it is safe for our van.
Three queries come first, before any quote, instead of after — what went in, how much, has it run — and that is the reason. A range turns into a straight figure when the replies are in.
About Lower Clough itself
Lower Clough is a suburban area situated on the riverside in West Yorkshire, with a mix of terraced housing and a population of around 3067 residents. Lower Clough sits at an elevation of 159 metres, approximately 12 miles from Bradford and 163 miles from London. Lower Clough is close to nearby places such as Linthwaite, Height, and Blackmoorfoot, and its riverside setting provides a distinctive character to the area. Lower Clough remains a residential community with a strong local identity.
Lower Clough and West Yorkshire: where our fuel drain cover runs
The teams answering petrol in diesel jobs around Lower Clough, in the HD postcode area, equally work the spots near it, Linthwaite, Height and Blackmoorfoot included. You need not bring your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots where we work.
In Lower Clough and still at the petrol pump?
The best position there is, then — that's where you are. Keep it off. Call.