Petrol in a Diesel Car in Holsworthy: How Worried Should You Be?
If it hasn't been started, you can worry less than you likely are. Petrol resting in a diesel tank does nothing to the engine till something draws it through your fuel system — your ignition priming the pump, your starter, or the drive itself. So the honest answer to the first query everyone in Holsworthy asks, "have I wrecked it?", is generally no. To leave the vehicle like that, ring Petrol in Diesel then leave your engine alone. Further down, you will find what petrol really does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
Inside your engine: what petrol in a diesel does
On its way through an engine, diesel does two jobs. It ignites, and before it combusts it protects. Built to extremely fine tolerances, your injectors and your pump depend on your diesel moving through them to stop their surfaces wearing against one another.
Of these two tasks, petrol handles the first badly and the second not at all. It is thinner than diesel and removes the lubrication the system depends on, so a pump running on a petrol blend is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That's where the rattling comes from.
The shape of the trouble is plain once you put those together. The damage is done by movement, not by contact. All a tank with petrol in it amounts to is a fuel fault. The start of a mechanical one is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with your fuel to your injectors beyond it.
Four situations we see around Holsworthy: how serious is petrol in a diesel?
The best case there is: filled up, not once started. The petrol is in the tank and just your tank, and the job is a drain and a flush where the car stands. This is the one situation that can only really happen on a forecourt, as anywhere else the vehicle has been driven to get there.
Started for a second, or only your ignition on. With the fuel system primed, the fuel lines and filter already hold petrol that came from the tank. Still generally easy: drain, flush, and the filter dealt with.
Driven a few miles. Now the pump has spent those miles labouring on weakened fuel. Tank, lines, filter, then clean fuel run through the whole circuit: that's the work, and the way the car was driven counts as much as the mileage. A school run to Holsworthy Church of England Primary School is one matter. Driving as far as Plymouth, under 50 miles away, makes a very different job — as does any distance on the M5, under 50 miles from Holsworthy, with the motor running hard the whole time.
Clattering, a ragged idle, smoke, a throttle gone soft: driven till it complained. What you are hearing is your engine reporting fuel that no longer acts like diesel. Pull up wherever you are — the verge on Victoria Square, a lay-by, a side street — and leave the vehicle there. Lasting damage is very uncommon when a vehicle is pulled over early, and the fuel drain and flush-through that still come first take care of it.
Holsworthy motorists and the petrol in a diesel stories they hear
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing is removed by topping up — you are left with a bigger tank, still the same mix. The assumption behind that guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
"Current diesels can handle a little petrol" — a myth, and nearer the opposite. Protection counts more on current diesels, not less, because their fuel passes through smaller parts at higher pressure.
Myth: "If it starts and drives, there's no harm done." This is the one that catches drivers. Diesel in a petrol motor generally means a motor that will not run: the motorist stops, and so does the harm. A diesel fed petrol usually starts, ticks over and drives away as though nothing has happened, whilst your pump grinds. Running isn't the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a different problem. It does not put back what petrol has thinned, and the petrol is still in your tank afterwards.
"Drain it yourself and you're sorted" — a myth, because after it's been running some petrol lies in the filter and lines, ready to go right back through the pump on the next start. Draining petrol into a can by the roadside is also really hazardous.
How petrol ends up: petrol in a diesel
A careless moment is rarely the cause, and no one means to do it. A diesel nozzle mostly will not fit a petrol car, but the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error straightforward, and just in that direction.
The moment habit stops matching the vehicle is the moment it takes place. Hire cars, courtesy cars, and motors that are new to you. Two cars on one driveway, one petrol, one diesel. A forecourt you know, but with its pumps laid out differently. Filling up in a hurry on the way to the nearest station, with a train to catch. Years of petrol vehicles behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that's when. Throw in a back seat full of kids, a phone call or rain, and habit takes over.
How to avoid petrol in a diesel on your next fill-up around Holsworthy
- Read the pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on each forecourt. The label is what counts.
- Inspect your filler flap. Plenty of motors state the fuel inside the flap or on the cap. Look at it on the first fill in any car you do not know.
- Good intentions do less than a sticker or a fob in a vivid colour on your diesel's key when a home has one of each. So mark it.
- "Diesel", aloud, before you lift the nozzle — every time a new or hired car needs its first tank. It seems daft. It works.
- Mistakes like this are straightforward to make whilst your mind is on something else, so the phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to refuse a petrol nozzle, and add-on devices exist for the rest. Count it as a safety net, then keep checking the pump.
- Stop as soon as you notice. Less petrol in the tank makes a thinner blend. It does not change what to do next, which is still not to start it.
Holsworthy: already put petrol in a diesel?
Short and simple, then, is the order of things. Leave it unstarted, with your ignition switched off too. The staff on the forecourt — whether at BP itself or wherever you filled up — will normally help push it away from the pump if you ask. Phone 0333 366 0103 next, with three answers — the fuel, the approximate amount, and if it's run.
Corrosion and deposits are the trouble with AdBlue, whereas petrol means lost lubrication. So if it was AdBlue, say so — and read its own Holsworthy page.
What makes one Holsworthy petrol in a diesel task cost more than the next
There is no honest single quote for this, because the four scenarios above are four separate tasks. Mostly, your cost shifts with which situation you're in. Two things follow that: the petrol that went in as a proportion of what your tank takes, then the place your car is in 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 that is the reason. A range turns into a straight figure when the answers are in.
About Holsworthy, briefly
Holsworthy is a town situated in the north of Devon, on the banks of the River Tamar, at an elevation of around 145 metres. Holsworthy lies near several small villages, including Whimble, Derriton, and Chasty, and is approximately 31.8 miles from Plymouth. Holsworthy has a population of around 3472 people, predominantly living in semi-detached housing. Holsworthy is located about 189.3 miles west of London, in the South West region of England.
Holsworthy and Devon: where our fuel drain cover runs
Whimble, Derriton and Chasty are among the places around Holsworthy that the same vans work, answering petrol in diesel calls across Holsworthy's EX postcode area. No need to move the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots where we work.
In Holsworthy and still at the pump?
No position is better: that's where you now are. Leave it switched off, and ring.