Should You Worry? Petrol in a Diesel Car in Hillfoot
Far less than you likely are, if it has not been started. Everyone in Hillfoot starts with "have I ruined it?", and the honest answer is generally no: petrol resting in that tank of any diesel remains harmless till priming, cranking or driving pulls it into the fuel system. To keep the vehicle like that, ring Petrol in Diesel and leave the engine alone. What petrol actually does to a diesel, how to gauge how far it has travelled, and how to stop it from happening again: that's the remainder of this page.
What petrol in a diesel does to the engine
Passing through an engine, diesel does two things at the same time. It lubricates first, and after that does it burn. Made to extremely fine gaps, the fuel injectors and your pump rely on your diesel moving through them to keep their surfaces from wearing against one another.
The second job petrol does not do at all, and the first it does poorly. Being less viscous than diesel, petrol strips away the protection a fuel system needs, leaving a pump running on the blend to wear itself. It's also made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the clattering.
The shape of the problem is clear once you put those together. Not contact but movement is what does the damage. A tank with petrol in it is a fuel issue. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with the fuel to the fuel injectors downstream.
Four situations our engineers see in Hillfoot: how serious is petrol in a diesel?
Fuelled up, never started. The best case there is. The petrol is in that tank and just your tank, and the task is a drain and a flush where your car stands. This is the one scenario that can only really take place at a forecourt, as anywhere else your car has been driven to get there.
Started for a second, or only your ignition on. Your system has been primed, so petrol has left that tank and reached your filter and your lines. Drain, flush, deal with your filter: still normally straightforward.
Those few miles on the road were the pump working on fuel weakened by petrol throughout. How hard your car was driven counts as much as how far, and this work takes in the tank, the fuel lines, the fuel filter and clean fuel through the entire circuit. On the school run to Pudsey Bolton Royd Primary School, the distance is short. A run as far as Bradford, under 3 miles away, is a very different task. So is any mileage on the M606, under 5 miles from Hillfoot, where the motor has been working hard the whole time.
Driven on until it protested — clattering, smoke, an uneven idle, a soft throttle. The engine is telling you the fuel is no longer behaving like diesel. Pull up wherever you are — the verge on Thorne Close, a lay-by, a side street — then leave the vehicle where it is. A car pulled over quickly very seldom has permanent damage, because the drain and the flush, which still go first, sort it out.
Myths Hillfoot 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 fuller tank of the same mixture is all you get, because topping up takes out nothing. Percentage is not how a diesel fuel system tolerates petrol, however much that guidance presumes.
If anything, the reverse is true. Myth: "A modern diesel can cope with a bit of petrol." Smaller components and higher pressure are the way a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
"It starts, it drives, and so no harm done" — the myth that trips up most people than any other. Any petrol engine fed diesel normally will not run, and so the motorist stops and the damage stops with them. Feed petrol to a diesel and it generally starts, ticks over and pulls away like nothing has happened — all while its pump is wearing. Being able to run isn't proof of being fine.
Myth: a two-stroke additive lets you to drive home. It was an old workaround, meant for another issue. None of what petrol weakened is put back by it — and later, your tank still holds that petrol.
The next start sends petrol back round your pump out of the fuel lines and the filter, where some of it sits after the engine has been run. That is why a DIY tank drain does not leave you sorted — a myth. On top of that, petrol drained into a can by the road is truly hazardous.
Why petrol in a diesel occurs so easily
On purpose? Never. Through carelessness? Rarely, if ever. One way only, because of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol car. That is how the forecourt makes it straightforward.
The moment routine stops matching the vehicle is the moment it takes place. Any car that's new to you — a hire car, on loan as a courtesy car, or just bought. Households running one of each, petrol and diesel. A forecourt you know, but with its pumps laid out differently. Fuelling up in a rush en route to New Pudsey, with a train to catch. Precisely the moment it happens: after years of driving petrol, a driver fills a diesel Renault Megane for the first time. Throw in rain, a phone call or a back seat full of kids, and the hand does what it has always done.
Next time you fill up in Hillfoot: preventing petrol in a diesel
- Check the pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on every forecourt. The label is what counts.
- The first fill in an unfamiliar motor is the time to check the filler flap — inside it, or on the cap, plenty of vehicles state which fuel to use.
- Good intentions do less than a sticker or a fob in a vivid colour on the diesel's key when a home has one of each. So label it.
- "Diesel", aloud, before you pick up the nozzle — every time a new or hired car gets its first tank. It sounds daft. It does the trick.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away then keep your mind on the petrol pump.
- Add-on devices exist for motors without one, and some diesels are built with a filler that won't take a petrol nozzle. Useful — but a backstop only, never a reason to stop checking the label.
- As soon as you realise, stop: less petrol inside that tank means a thinner mixture. What to do next does not change, though — still do not crank it.
Petrol already in a diesel in Hillfoot? Begin here
The order of things is brief, then. Never crank it, and don't switch the ignition on. If you are still on the forecourt — Asda or anywhere else — ask the staff to help you push the car clear of the petrol pump. Then call 0333 366 0103 and tell us what got in, about how much, and whether it's run.
Say so if it was AdBlue instead of petrol: it's a separate problem, with its own page for Hillfoot, because AdBlue brings corrosion and deposits instead of lost lubrication.
Why one petrol in a diesel task in Hillfoot costs more than another
The four scenarios above are four different jobs, so no single price for this would be honest. Chiefly, the cost moves with which one you're in. The ratio matters next, meaning how much of the tank is petrol, followed by the location of the vehicle and whether reaching it is safe for a technician.
Three questions come first, before any quote, instead of after — what got in, how much, has it run — and that is the reason. A range becomes a straight figure once the answers are in.
About Hillfoot
Hillfoot is a suburban area located on the riverside in West Yorkshire, with a mix of semi-detached housing and a population of around 5363 residents. Hillfoot sits at an elevation of 164 metres, close to the city of Bradford, which is approximately 2.7 miles away. Hillfoot is near other local places such as Delph End, Round Hill, and Thornbury, and is part of the larger urban area surrounding Bradford. Hillfoot is situated in a region with a strong industrial heritage, near the Yorkshire countryside.
Fuel drain cover across West Yorkshire, Hillfoot included
Petrol in diesel call-outs in Hillfoot — part of the LS postcode area — go to vans that also cover the spots around it, Delph End, Round Hill and Thornbury included. You need not move the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations we drain.
Hillfoot: still at the pump?
Nothing beats it: that is where you are. Ring, and keep it switched off.