How Worried Should You Be? Petrol in a Diesel Car in Turfholm
Far less than you probably are, provided it has not been started. Until your ignition primes your pump, the starter turns, or your car is driven, petrol in a diesel tank just waits there and does nothing. Which makes the honest reply to the first Turfholm query — "have I wrecked it?" — usually no. Leave your engine off and ring Petrol in Diesel — that keeps it like that. What petrol really does to a diesel, how to judge how far it has gone, and how to stop it from happening again: that's the rest of this page.
Inside the motor: what petrol in a diesel really does
Passing through an engine, diesel does two jobs at the same time. Before it burns, it lubricates — then it burns. Extremely fine tolerances are built into the injectors and your high-pressure pump, and only your diesel flowing through stops those surfaces grinding together.
Of those two tasks, petrol handles the first poorly and the second not at all. A pump running on a petrol mixture is wearing itself out, because petrol is thinner than diesel and strips out the protection your fuel system relies on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that is where the rattling comes.
Taken together, they show the shape the trouble takes. Contact does not do the damage — circulation does. Any tank with petrol in it is a fuel fault. Once the pump has been running on that petrol, a mechanical problem has begun: whatever is shed by a pump that is grinding travels onward to the fuel injectors with your fuel.
Four situations we see around Turfholm: how serious is petrol in a diesel?
Fuelled up, never started. The best case there can be. Being on a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With the petrol kept inside your tank alone, it is drained and cleaned on the spot, and nothing more is needed.
Your ignition turned on, or a short start. With your system primed, the lines and filter now contain petrol that has come from the tank. That is usually still an easy task — a drain, a flush, and the fuel filter dealt with.
The pump has worked a couple of miles on weakened fuel — that is what driving the car meant. Mileage is only half of it; how hard it was driven matters just as much. Either way the work runs to your tank, your lines, the fuel filter and fresh fuel through the entire circuit. Short trips, like the school run to the local primary school, are one thing. A run as far as Glasgow, under 25 miles away, is a very different task. So is any miles on the M74, under a mile from Turfholm, where the engine has been running hard the whole time.
Driven on till it complained — rattling, smoke, an uneven idle, a dead throttle. What you are hearing is your engine signalling fuel that no longer behaves like diesel. Pull up on the spot — on the verge on Woodside Close, at the kerb, down a side road — and do not move it. What comes first is still the drain and flush, and that deals with it, with long-term damage very unusual when a vehicle is stopped early.
What Turfholm drivers get told about petrol in a diesel — and the myths in it
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up takes out nothing; it gives you a bigger tank of the same mix. A diesel fuel system does not tolerate petrol by percentage in the way that guidance presumes.
"Newer diesels can handle a little petrol" — a myth, and nearer the reverse. Lubrication counts more on newer diesels, not less, since their fuel runs through finer components at higher pressure.
"It starts, it drives, and so there is no harm" — the myth that catches more drivers than any other. Diesel in a petrol motor usually means a motor that will not run: the motorist stops, and so does the harm. While your pump wears, a diesel fed petrol usually starts, idles and drives away as though nothing has happened. Running is not the same as fine.
An outdated fix for a distinct problem lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." It does not put back what petrol has diluted, and the petrol is still inside your tank later.
Myth: "Drain that tank yourself and you're sorted." After the engine has been run, some of that petrol is no longer inside that tank: it is in the fuel filter and your lines, and it goes straight back through the pump on the next start. And, a can of petrol drained at the roadside is genuinely hazardous.
How does petrol in a diesel happen?
Carelessness is rarely the cause, and no one means to do it. A diesel nozzle mostly won't fit a petrol car, yet the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error simple, and only in one direction.
Habit and your car getting out of step is how it happens. Any car that is new to you — hired, on loan as a courtesy car, or brand new. Households running one of each, petrol and diesel. Your ordinary forecourt, its pumps now in a different order. A rushed fill en route to Lanark with a train to catch. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that's when. Your hand does what it has always done when you add rain, a phone call or a back seat full of kids.
Turfholm drivers: how to avoid petrol in a diesel next time
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most generally do. Read the pump's label; the colour is just a hint.
- Check the filler flap. Many motors state the fuel type inside the flap or on the cap. Look at it on your first fill in a motor you do not know.
- Label the key. In a home with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- "Diesel", aloud, before you pick up the nozzle — each time a new or hired car gets its first tank. It sounds daft. It does the trick.
- Tuck the phone away. This is an easy mistake to make whilst you're thinking about something else.
- Add-on devices exist for vehicles without one, and some diesels are built with a filler that won't accept a petrol nozzle. Useful — but a backstop at best, never a reason to stop checking the label.
- Stop as soon as you realise. Less petrol in the tank means a weaker blend. It does not change what to do next, which is still not to fire it up.
Petrol already in a diesel around Turfholm? Begin here
In that case, there is only a short order of things. Don't fire it up, and do not switch the ignition on. If you're still at the forecourt — Tesco or anywhere else — ask the attendants to help you roll the vehicle clear of the pump. Then call 0333 366 0103 and tell us what got in, roughly how much, and whether it has run.
Say so if it was AdBlue rather than petrol: it is a different issue, with its own page for Turfholm, since AdBlue brings corrosion and deposits rather than lost lubrication.
One petrol in a diesel task in Turfholm costs more than another. Why?
Four separate tasks lie behind the four scenarios above — which is why there is no fair single price. What moves your cost is mostly which of them you're in. Next it is the ratio — how much petrol went in against how much the tank takes — and then where the car is and whether a technician can get to it safely.
Three questions come first, before quoting, rather than after — what was put in, how much, has it run — and this is the reason. Their replies are what turn a range into one firm number.
About Turfholm itself
Turfholm is a riverside locality in South Lanarkshire, situated near the towns of Lesmahagow and Milton. Turfholm sits at an elevation of 192 metres, with the majority of its housing consisting of flats. Turfholm is located approximately 20.9 miles from Glasgow, making it a commuter base for the city. Turfholm has a population of around 1354 people, with nearby Brocketsbrae also forming part of the local community.
Turfholm and South Lanarkshire: where our fuel drain cover runs
Lesmahagow, Brocketsbrae and Milton are among the spots around Turfholm that the same vans work, answering petrol in diesel call-outs across Turfholm's ML postcode area. The vehicle does not need to move to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
In Turfholm and still at the pump?
In that case, you couldn't be in a better place. Keep it off. Call.