Should You Worry? Petrol in a Diesel Car in Sporle
Less than you likely are, provided it hasn't been started. Until your ignition primes the pump, the starter turns, or your vehicle is driven, petrol in a diesel tank simply rests there and does nothing. Which means the honest reply to the first Sporle question — "have I ruined it?" — normally no. To leave the car that way, phone Petrol in Diesel and leave your motor switched off. Below, this page sets out what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you again.
Inside the motor: what petrol in a diesel really does
Diesel has two tasks on its way through an engine. It burns, and before it ignites it lubricates. What stops the surfaces inside your high-pressure pump and your injectors from wearing down against one another is your diesel flowing through them — they're designed to extremely fine clearances.
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, because petrol is runnier than diesel and takes away the lubrication the fuel system relies on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that's where the rattling starts.
Put those together and the shape of the issue is clear. The damage is done by circulation, not by contact. Petrol in a tank is a fuel problem. After your pump has been running on that petrol, a mechanical fault has begun: whatever is shed by a pump that is grinding travels downstream to the injectors with the fuel.
How bad is petrol in a diesel? Four scenarios we see in Sporle
Fuelled, and never started: no case is better. 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 drained and rinsed on the spot, and nothing more is needed.
Your ignition switched on, or a short start. The fuel system has been primed, so petrol has left your tank and got to the fuel filter and your lines. That's usually still a simple job — a drain, a flush, and the fuel filter dealt with.
Those few miles driven were the pump running on fuel thinned by petrol throughout. Distance is only half of that; how hard it was driven matters just as much. Either way the work runs to your tank, the fuel lines, the fuel filter and fresh fuel through the whole circuit. Short trips, like the school run to Sporle Church of England Primary Academy, are one matter. Getting as far as Norwich, under 25 miles away, makes a very different job — as does any distance on the M11, under 50 miles from Sporle, with the motor working hard the whole time.
Driven till it complained. Clattering, a lumpy idle, smoke, a throttle that has gone soft. What you are hearing is the engine signalling fuel that no longer behaves like diesel. Pull up on the spot — on the verge on Bunkers Hill, at the kerb, down a side road — and don't move it again. The drain and flush-through still come first, and they take care of it: when a car is stopped soon, long-term damage is very unusual.
Stories Sporle drivers hear about petrol in a diesel
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 mix. The assumption behind the advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
If anything, the opposite is true. Myth: "A newer diesel can cope with a bit of petrol." A newer diesel sends its fuel through smaller components at higher pressure, which makes the lubrication count more, not less.
One myth that catches motorists out: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it generally will not 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, as it usually does; meanwhile your pump grinds. Running isn't the same as fine.
An outdated fix for a separate problem lies behind this one. Myth: "Add some two-stroke oil and drive the car home." The petrol is still in the tank afterwards, and what it has diluted is not put back.
If your engine has run, part of the petrol is in the filter and the fuel lines, not your tank — and your next start pulls it right back through your pump. So the myth "drain that tank yourself and you are sorted" doesn't hold. On top of that, petrol drained into a can by the road is genuinely risky.
Petrol in a diesel: how does it take place?
On purpose? Never. Through carelessness? Seldom, if ever. The forecourt makes it simple: the petrol nozzle is the slimmer of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle mostly will not go into a petrol car at all. So the mistake runs one way.
The moment habit stops matching the vehicle is the moment it happens. Any vehicle that is new to you — hired, on loan as a courtesy car, or just bought. A household with one petrol and one diesel on the driveway. The pumps in a different order on a familiar forecourt. A train to catch, and a hurried fill on the way to the nearest station. The first fill-up in a diesel Volkswagen Passat after years of driving petrol is exactly the moment it happens. With rain, a call coming in, or children to deal with, the hand just does what it always has.
Sporle motorists: how to prevent 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. Read the pump's label; the colour is only a hint.
- Check your 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.
- One of each in the household? Mark your key to your diesel — a bright fob, a sticker — since intending to remember is not enough.
- It sounds silly 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 simple to make whilst your mind is on something else, and so the phone goes away.
- Some diesels come with a filler built to refuse a petrol nozzle, and devices you can add are available for motors without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the petrol pump.
- Noticing it mid-fill? Stop at once. A weaker mix results from less petrol in that tank, yet your next step remains the same: do not start it.
Already put petrol in a diesel around Sporle?
Short and simple, then, is the order of things. Don't fire it up, and don't turn the ignition on. If you are still at the forecourt — BP or anywhere else — ask the attendants to help you roll the car away from the pump. Ring 0333 366 0103 next, with three facts — the fuel, the approximate amount, and whether it's run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a different fault — Sporle has a page just for it.
Sporle petrol in a diesel jobs: why one costs more than another
An honest single price does not exist here: four scenarios, four separate jobs. The scenario itself does most of the work of moving the cost. Next it is the ratio — how much petrol got in against how much that tank holds — and after that where your car is and whether our van can reach it safely.
Three questions come first, before quoting, rather than after — what got in, how much, has it run — and that is the reason. Given those replies, there is a straight figure instead of a range.
About Sporle, for a moment
Sporle is a small village in Norfolk, situated inland at an elevation of around 66 metres, with Sporle being one of the many rural communities in the Eastern region. Sporle lies approximately 23 miles west of Norwich and 88 miles north-east of London, with Sporle being close to nearby places such as Little Dunham and Necton. Sporle has a population of around 573 people, with Sporle predominantly consisting of detached housing.
Fuel drain cover across Norfolk, Sporle included
Sporle sits in the PE postcode area, and the teams that answer petrol in diesel calls there work the spots around it as well — Little Dunham, Tumbler Hill and Necton among them. You need not bring the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places we drain.
Still at the petrol pump around Sporle?
Then, you couldn't be in a better position. Leave the vehicle switched off, and ring.