Should You Worry? Petrol in a Diesel Car in Laigh Fenwick
Not started? Then less worried than you likely feel. Everyone in Laigh Fenwick starts with "have I wrecked it?", and the fair answer is generally no: petrol left in the tank of a diesel remains harmless till priming, cranking or driving draws it into the system. Petrol in Diesel is who to phone, with the motor kept off, and so it stays that way. The rest of this page sets out what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it doesn't happen to you again.
Inside the engine: what petrol in a diesel really does
Two tasks fall to diesel on its route round a motor. Before it burns, it lubricates — then it combusts. What keeps the surfaces inside the high-pressure fuel pump and the fuel injectors from wearing against one another is your diesel passing through them — they are designed to very fine tolerances.
The second task petrol doesn't do at all, and the first it does poorly. A pump running on a petrol blend is wearing itself out, since petrol is thinner than diesel and strips out the lubrication your fuel system depends on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that is where the rattling starts.
Put those together and the shape of the trouble is plain. Contact does not do the harm — circulation does. A tank with petrol in it is a fuel problem. Once the pump has been working on that petrol, a mechanical problem has begun: whatever is shed by a pump that's wearing down is carried downstream to the fuel injectors with your fuel.
How bad is petrol in a diesel? Four situations our engineers see around Laigh Fenwick
Filled but never started — as good as it gets. Only your tank has petrol in it, and so the job is clearing that tank and cleaning your system where the car stands. This scenario can only truly take place on a forecourt: anywhere else, your car got there by being driven.
Ignition on, or started for a second. Petrol has left your tank and reached your filter and the lines, since the fuel system has been bled. Still usually simple: drain, flush, and your filter seen to.
Those few miles driven meant the pump labouring on fuel weakened by petrol throughout. Tank, lines, filter, then fresh fuel put through the entire system: that's the work, and the way your car was driven counts as much as the miles. A school run to the local primary school is one thing. Very different again: a trip to Glasgow, under 25 miles away, or some mileage on the M77, under a mile from Laigh Fenwick, where the engine kept labouring hard.
Driven on until it complained — clattering, smoke, an uneven idle, a dead throttle. That's the motor telling you its fuel has stopped behaving like diesel. Leave it wherever it stops: a lay-by, a side street, the verge on Waterslap. A car stopped early very rarely has permanent damage, since the fuel drain and the flush-through, which still go first, deal with it.
Laigh Fenwick drivers and that 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 by topping up — you are left with a bigger tank, still the same mixture. That advice presumes a diesel fuel system handles petrol by percentage. It doesn't.
Myth: a current diesel copes with a bit of petrol. Rather, the opposite. Smaller parts and higher pressure are the way a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
One myth that catches people out: if it starts and drives, it must be unharmed. Feed diesel to a petrol engine and it usually 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 does; meanwhile your pump wears. Being able to run is not proof of being fine.
An outdated workaround for a distinct issue is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." What petrol has diluted stays diluted, and the petrol remains inside that tank regardless.
Once the engine has run, part of that petrol is in the filter and the fuel lines, not the tank — and your next start pulls it straight back through your pump. So the myth "drain that tank yourself and you are sorted" does not stand up. It is also truly risky to drain petrol into a can at the roadside.
How does petrol in a diesel take place?
No one does it on purpose, and it is rarely carelessness. A diesel nozzle generally won't go into a petrol car, yet the slimmer petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake simple, and only in that direction.
The moment routine stops matching the vehicle is the moment it occurs. Courtesy car, hire car, or a vehicle that's new. Two vehicles on one driveway, one petrol, one diesel. A forecourt you know, only with its pumps arranged differently. A hurried fill on the way to Stewarton with a train to catch. Precisely the moment it occurs: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Add rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
Laigh Fenwick people: how to avoid petrol in a diesel next time
- Check the petrol pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on every forecourt. The label is what counts.
- Check your filler flap. Many motors state the fuel inside the flap or on the cap. Look at it on your first fill in any motor you don't know.
- A coloured fob or a sticker on the diesel's key does more than any amount of intending to remember, for a house with one of each.
- It sounds daft and it works: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump.
- Mistakes like this are straightforward to make whilst your mind is on something else, and so the phone goes away.
- 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 safety net only, never a reason to stop checking the label.
- The moment you realise, stop: less petrol in that tank makes a thinner mixture. What to do next does not change, though — still don't fire it up.
Already put petrol in a diesel in Laigh Fenwick?
In that case, there is only a short order of things. Leave it unstarted, with the ignition switched off as well. Ask the attendants to help you push it clear of the petrol pump if you're still on the forecourt, whether that is BP or anywhere else. Next, 0333 366 0103. We will ask what was put in, roughly how much, and if it has been run.
If it was AdBlue and not petrol, say so. That is a separate problem — corrosion and deposits instead of lost protection — and it has its own page for Laigh Fenwick.
One petrol in a diesel task in Laigh Fenwick costs more than another. Why?
An honest single quote doesn't exist here: four scenarios, four separate jobs. What moves the cost is mostly which of them you're in. Two things come after that: the petrol that got in as a proportion of what the tank takes, then the place your car is in and whether a van can reach it safely.
Three queries come first, before any quote, rather than after — what got in, how much, has it run — and that is the reason. The replies turn a range into a straight figure.
About Laigh Fenwick and where it is
Laigh Fenwick is a small suburban area situated on the riverside in East Ayrshire, with a mix of detached housing and a relatively low elevation of 122 metres. Laigh Fenwick lies near the larger town of Fenwick and the village of Waterside, and is also close to Moscow. Laigh Fenwick is located approximately 16.6 miles from Glasgow, making it a commuter base for the city.
Fuel drain cover in Laigh Fenwick and across East Ayrshire
Our teams answering petrol in diesel calls in Laigh Fenwick, in the KA postcode area, equally work the locations around it, Fenwick, Waterside and Moscow included. The car does not need to come to us: we drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
At the petrol pump in Laigh Fenwick, still?
No position is better: that's where you are. Turned off it remains; then phone.