Petrol in a Diesel Car in Puriton: How Worried Should You Be?
Likely less than you are now — provided no one has started it. Everyone in Puriton begins with "have I wrecked it?", and the fair answer is normally no: petrol resting inside the tank of any diesel remains harmless until priming, cranking or driving pulls it into the fuel system. Keep it like that: leave your motor off then call Petrol in Diesel. What petrol actually does to a diesel, how to judge how far it has travelled, and how to keep it from happening a second time: that's the rest of this page.
Your engine and petrol in a diesel: what goes on
On its way through an engine, diesel has two jobs. It protects first, and only then does it burn. The high-pressure fuel pump and the injectors are designed to extremely fine gaps, and the diesel passing through them is what stops those surfaces from wearing against each other.
Petrol does the first task badly and the second not at all. It is runnier than diesel and strips away the lubrication the system depends on, and so a pump running on a petrol mixture is a pump wearing itself. And petrol is made to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That's where the knocking comes from.
Combined, those leave the shape of the problem plain. The damage is done by circulation, not by contact. Where that petrol is only in the tank, it is a problem of fuel, nothing more. Once the pump has been working on that petrol, a mechanical fault has begun: whatever is shed by a pump that's grinding travels downstream to the injectors with the fuel.
Puriton, petrol in a diesel: four cases, from mild to significant
Fuelled, and not started: nothing beats it. Being on a forecourt is what makes this the case: elsewhere, the car has been driven there to begin with. With that petrol held in the tank alone, it's cleared and rinsed right where it stands, and nothing more is needed.
Ignition on, or started for a moment. Your system has been primed, and so petrol has left that tank and got to the filter and the fuel lines. Usually nothing more than clearing, purging and sorting the filter, so still easy.
Driven a couple of miles. Now your pump has spent these miles working on diluted fuel. Distance is only half of it; how hard it was driven matters just as much. Either way the work includes your tank, the lines, the fuel filter and clean fuel through the entire system. Driving the kids to Puriton Primary School is one kind of trip. Any mileage on the M5, under a mile from Puriton, means your engine working hard throughout, and a run to Wells, under 15 miles away, makes a very different task as well.
Driven on until it complained — knocking, smoke, an uneven idle, a dead throttle. The fuel isn't behaving like diesel any more, and your engine is telling you. Leave it wherever it has stopped: a lay-by, a quiet street, the verge on Rye. What goes first is still the fuel drain and flush-through, and that deals with it, with lasting damage very uncommon if a vehicle is pulled over early.
Puriton motorists and the petrol in a diesel myths they hear
False: topping up to full with diesel makes it fine. It does not. Nothing is removed by topping up — you're left with a bigger tank, still the same mixture. The assumption behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong.
"Current diesels can handle a little petrol" — a myth, and closer to the opposite. A modern diesel runs its fuel through finer components at higher pressure, which makes the lubrication count more, not less.
This is the one that fools motorists. Myth: "If it starts and drives, there's no damage done." A petrol engine fed diesel generally will not run, and so the driver stops and the damage stops with them. A diesel fed petrol usually starts, ticks over and drives away as though nothing has happened, whilst the pump wears. Fine and running are not the same at all.
An outdated fix for a distinct issue lies behind this one. Myth: "Add some two-stroke oil and drive the car home." What petrol has diluted stays diluted, and that petrol remains in the tank regardless.
Myth: "Drain the tank yourself and you are sorted." After your engine has run, some of that petrol is no longer in the tank: it is in your filter and your lines, and it goes straight back through your pump on your next start. Besides, petrol emptied into a can by the road is genuinely hazardous.
Why petrol in a diesel takes place at all
It's seldom carelessness, and no one does it on purpose. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle generally will not go into a petrol car at all. So the mistake runs one way.
It happens when habit and the car stop matching. A motor that's new to you — a hire car, on loan as a courtesy car, or brand new. A household with one petrol and one diesel on the drive. A forecourt you know, but with its pumps arranged differently. A rushed fill en route to Bridgwater with a train to catch. Years of petrol vehicles behind you, a diesel Volkswagen Passat in front of you on the forecourt for its first tank — that is when. Add rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
Puriton motorists: how to avoid petrol in a diesel next time
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Check the petrol pump's label; the colour is just a clue.
- Many motors state the fuel type inside your filler flap or on the cap, and so check it on your first fill in a vehicle you don't know.
- A coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember, in a home with one of each.
- It sounds silly and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Tuck the phone away. This is an easy mistake to make while you are thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to refuse a petrol nozzle, and aftermarket devices exist for the remainder. Treat it as a safety net, and keep checking the pump.
- Less petrol makes a weaker mixture, so stop as soon as you realise — while remembering that the next step is unchanged. It's still not to start the car.
Petrol already in a diesel in Puriton? Begin here
Then the order of things is short. Leave it unstarted, with your ignition off too. Still on the forecourt, at BP or anywhere else? Ask the staff to help you roll the car clear of the pump. Ring 0333 366 0103 next, with three facts — the fuel, the rough volume, and if it has run.
If it was AdBlue and not petrol, say so. That's a different fault — corrosion and deposits and not lost lubrication — and it has its own page for Puriton.
One petrol in a diesel task in Puriton costs more than another. Why?
There's no fair single price for this, since the four situations above are four different tasks. What moves your cost is mostly which of them you are in. Two things come after that: the petrol that was put in as a share of what the tank holds, then the spot your car is in and whether a technician can get to it safely.
Three questions come first, before quoting, instead of after — what got in, how much, has it run — and this is the reason. A range turns into a straight figure when the answers are in.
About Puriton
Puriton is a small village in Somerset, situated near the coast and close to the M5 motorway. Puriton has a population of around 1138 people and is characterized by semi-detached housing. Puriton is located near other small settlements such as Down End and Dunball, and is within commuting distance of the city of Wells. Puriton sits at a low elevation of 12 metres above sea level, in the gently sloping coastal lowlands of Somerset.
Fuel drain cover around Puriton and across Somerset
Our vans answering petrol in diesel jobs in Puriton, in the TA postcode area, equally work the locations near it, Down End, Dunball and Walpole among them. Our technicians drain wherever the vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
At the pump around Puriton, right now?
In that case, you couldn't be in a better spot. Leave the car switched off, then ring.