Should You Worry? Petrol in a Diesel Car in Bishops Lydeard
Likely less than you are now — provided no one has started it. Until the ignition primes the pump, the starter cranks, or your car is driven, petrol in a diesel tank simply sits there and does nothing. Which means the honest reply to the first Bishops Lydeard query — "have I wrecked it?" — normally no. Keep it like that: leave your engine off and phone Petrol in Diesel. Below, you will find what petrol really does inside a diesel, how far it may have got, and how to stop it happening to you a second time.
The engine and petrol in a diesel: what happens
Passing through an engine, diesel does two jobs at the same time. It lubricates to begin with, and after that does it burn. Very fine clearances are built into the fuel injectors and the high-pressure fuel pump, and only the diesel flowing through keeps those surfaces from grinding together.
The second task petrol doesn't do at all, and the first it does badly. The knocking comes from petrol being made not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the lubrication the fuel system hinges on, and any pump working on such a blend is wearing itself.
The shape of the issue is plain when you put those together. Not contact but movement is what causes the damage. All a tank with petrol in it amounts to is a fuel problem. After your pump has been running on that petrol, a mechanical fault has begun: anything shed by a pump that is wearing travels onward to your injectors with the fuel.
How serious is petrol in a diesel? Four scenarios we see in Bishops Lydeard
Fuelled, and never started: nothing beats it. That petrol is in your tank and just the tank, and the task is a drain and a flush where the car stands. This is the one scenario that can only truly occur at a forecourt, because anywhere else the car has been driven to get there.
The ignition switched on, or a brief start. Your system has been bled, so petrol has left the tank and got to your filter and the lines. Still normally simple: drain, flush, and the filter dealt with.
Driven a few miles. Now your pump has spent these miles working on diluted fuel. How hard your car was driven counts as much as how far, and this work covers your tank, your lines, your filter and clean fuel through the whole circuit. Driving the kids to Bishops Lydeard Church School is one kind of trip. Very different again: a run to Wells, under 50 miles away, or some mileage on the M5, under 10 miles from Bishops Lydeard, where the motor kept running hard.
Driven till it complained. Knocking, a lumpy idle, smoke, a throttle that has gone soft. What you are hearing is your engine reporting fuel that no longer acts like diesel. Pull up wherever you are — the verge on Mount Street, a lay-by, a side street — and leave it there. What comes first is still the drain and flush, and that deals with it, with permanent damage very unusual when a vehicle is stopped quickly.
Bishops Lydeard motorists and that petrol in a diesel myths they hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. A bigger tank of the same mixture is all it gives, since topping up removes nothing. The assumption behind that guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: a newer diesel copes with a bit of petrol. If anything, the opposite. A modern diesel runs its fuel through more precise components at higher pressure, which makes the lubrication matter more, not less.
This is the one that catches motorists. Myth: "If it starts and drives, there's no damage done." The motorist of a petrol engine fed diesel usually stops, since it will not run, and the harm stops there. Feed petrol to a diesel and it usually starts, idles and drives away like nothing happened — all while its pump is wearing. A running engine doesn't mean fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a distinct fault. That petrol is still inside your tank after that, and what it has thinned is not put back.
Once the engine has run, part of that petrol is in the filter and the lines, not your tank — and your next start pulls it straight back through the pump. So the myth "drain the tank yourself and you're sorted" does not stand up. And, a can of petrol drained at the roadside is genuinely dangerous.
How does petrol in a diesel take place?
A careless moment is seldom the cause, and no one means to do it. The petrol nozzle is the narrower of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol car at all. The forecourt makes it easy, and the mistake runs one way.
It occurs when routine and the car stop matching. Any vehicle that's new to you — hired, on loan as a courtesy car, or just bought. Two motors on one drive, one petrol, one diesel. A forecourt you know, only with its pumps laid out differently. A train to catch, and a hurried fill on the way to Taunton. Years of petrol motors behind you, a diesel Nissan Qashqai in front of you on the forecourt for its first tank — that's when. Throw in rain, a phone call or a back seat full of kids, and the hand repeats what it has always done.
Bishops Lydeard people: 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. Check the pump's label; the colour is only a clue.
- The first fill in a strange motor is the time to check the filler flap — inside it, or on the cap, many motors state which fuel they take.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of intending to remember, for a house with one of each.
- It seems 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.
- Whilst you're thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to reject a petrol nozzle, and aftermarket devices exist for the rest. Count it as a backstop, then keep checking the petrol pump.
- The moment you realise, stop: less petrol in your tank means a thinner mixture. What to do next doesn't change, though — still don't start the car.
Bishops Lydeard: already put petrol in a diesel?
The order of things is brief, then. Leave it unstarted, with your ignition switched off as well. The attendants on the forecourt — whether at Murco itself or wherever you filled up — will normally help roll it away from the pump if you ask. Next, 0333 366 0103. We will ask what was put in, roughly how much, and if it has been run.
Say so if it was AdBlue instead of petrol: it is a separate fault, with its own page for Bishops Lydeard, since AdBlue brings corrosion and deposits rather than lost lubrication.
One petrol in a diesel job around Bishops Lydeard costs more than another. Why?
The four situations above are four separate tasks, so no single price for this would be honest. Which of them you're in is mostly what moves your cost. Beyond that it is the share — how much petrol got in against how much your tank holds — and after that where the vehicle is and whether a technician can get to it safely.
That is why our technicians ask three questions before costing rather than after: what got in, how much, and if it has run. Given those replies, there is a straight figure instead of a range.
About Bishops Lydeard itself
Bishops Lydeard is a village situated in the Somerset countryside, near the River Tone and close to the Quantock Hills. Bishops Lydeard has a mix of old and new housing, with detached homes being the predominant type, and is surrounded by nearby places such as Greenway and East Lydeard. Bishops Lydeard sits at an elevation of 57 metres, making it a relatively low-lying area, and is located approximately 25 miles from the city of Wells. Bishops Lydeard is also within commuting distance of larger cities, with London being around 136 miles away.
Bishops Lydeard and Somerset: where our fuel drain cover runs
Petrol in diesel jobs around Bishops Lydeard — part of the TA postcode area — go to teams that also cover the places about it, Greenway, East Lydeard and Ash Priors among them. The car doesn't need to come to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the petrol pump around Bishops Lydeard?
No position is better: that is where you now are. Leave the car turned off, and ring.