Higher Cloughfold: Petrol in a Diesel Car? How Worried to Be
Probably less than you are now — provided nobody has started the car. Petrol resting in a diesel tank does nothing to your engine till something draws it through the fuel system — the ignition priming your pump, the starter, or the drive itself. So the honest answer to the first query everyone around Higher Cloughfold asks, "have I ruined it?", is normally no. Petrol in Diesel is who to call, with your engine kept off, and so it remains that way. What petrol really does to a diesel, how to judge how far it's travelled, and how to stop it from happening a second time: that's the remainder of this page.
Inside your engine: what petrol in a diesel does
Passing through an engine, diesel does two jobs at once. Before it combusts, it lubricates — and then it combusts. What keeps the surfaces inside your high-pressure pump and your injectors from wearing down against each other is your diesel flowing through them — they are made to very fine clearances.
Petrol does the first job badly and the second not at all. 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 system depends on, and any pump running on that mix is wearing itself.
Together, those leave the shape of the trouble plain. It's circulation that does the damage, not contact. A tank with petrol in it is a fuel fault. The start of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds travels on with the fuel to your injectors beyond it.
How serious is petrol in a diesel? Four scenarios our technicians see in Higher Cloughfold
The best case there is: filled up, not once started. That petrol is in that tank and only the tank, and the task is a drain and a flush where the car sits. This is the one situation that can only truly take place on a forecourt, because anywhere else your car has been driven to get there.
Started for a second, or just the ignition on. Once primed, your system has drawn petrol from that tank as far as the filter and the lines. That is normally still a straightforward task — a drain, a flush, and the filter seen to.
The pump now worked a few miles on diluted fuel — that is what driving the vehicle meant. How hard the vehicle was driven counts as much as how far, and this work covers the tank, the fuel lines, your filter and fresh fuel through the entire circuit. On the school run to St Peter's Roman Catholic Primary School, Newchurch, the mileage is small. Any distance on the M66, under 3 miles from Higher Cloughfold, means your engine has worked hard throughout, and a run to Salford, under 25 miles away, is a very different job as well.
Driven until it protested. Knocking, an uneven idle, smoke, a throttle that has gone soft. The fuel isn't acting like diesel any more, and your engine is saying so. Leave it wherever it has stopped: a lay-by, a quiet street, the verge on Edge Lane. The drain and flush-through still come first, and they take care of it: if a vehicle is pulled over quickly, long-term damage is very uncommon.
What Higher Cloughfold people get told about petrol in a diesel — and the myths in it
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing is removed by topping up — you are left with a fuller tank, still the same mix. Percentage isn't how a diesel fuel system tolerates petrol, however much that advice presumes.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. Finer components and higher pressure are how a modern diesel runs its fuel, and that makes the protection count more, not less.
This is the one that catches people. Myth: "If it starts and drives, there is no harm done." Diesel in a petrol motor generally means a motor that won't run: the driver stops, and so does the damage. While the pump wears, a diesel fed petrol normally starts, idles and drives away as though nothing has happened. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive the car home." It's an old workaround for a separate problem. The petrol is still inside the tank after that, and whatever it has weakened is not put back.
If the motor has been run, part of the petrol is in the filter and the lines, not the tank — and the next start sends it straight back through your pump. So the myth "drain your tank yourself and you're sorted" doesn't stand up. It is also truly dangerous to drain petrol into a can by the kerbside.
How it happens: petrol in a diesel
A careless moment is rarely the cause, and nobody means to do it. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol vehicle at all. The forecourt makes it easy, and the error runs one way.
When routine and your car stop matching, it takes place. Courtesy car, hire car, or a motor that is new. One petrol and one diesel on the driveway of the same household. Your ordinary forecourt, its pumps now in a different order. A train to catch, and a rushed fill en route to Accrington. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is exactly the moment it happens. Add a back seat full of children, a phone call or rain, and the hand wins.
Avoiding petrol in a diesel next time you fill up in Higher Cloughfold
- Check the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, yet not on each forecourt. The label is what counts.
- Plenty of cars state the fuel inside your filler flap or on the cap, so check there on your first fill in a vehicle you don't know.
- Good intentions do less than a sticker or a fob in a bright colour on your diesel's key when a household has one of each. So mark it.
- Before the nozzle comes off the petrol pump the first time you fuel a hired or new motor, say "diesel" aloud. Daft, yes, yet it works.
- Mistakes like this are straightforward to make while your mind is on something else, and so your phone goes away.
- Add-on devices exist for cars without one, and some diesels are built with a filler that won't accept a petrol nozzle. Useful — but a safety net only, never a reason to stop checking the label.
- Less petrol means a thinner blend, so stop the moment you realise — while remembering that your next stage is unchanged. It is still not to fire it up.
Higher Cloughfold: already put petrol in a diesel?
Short and simple, then, is the order of things. Don't turn the ignition on, and don't fire it up. The staff at the forecourt — whether at Texaco itself or wherever you filled up — will usually help push it clear of the pump if you ask. Then call 0333 366 0103 and tell us what was put in, about how much, and if it's run.
If it was AdBlue instead of petrol, say so. That's a separate problem — corrosion and deposits instead of lost lubrication — and it has its own page for Higher Cloughfold.
Why one petrol in a diesel job in Higher Cloughfold costs more than another
A fair single price does not exist here: four situations, four separate tasks. The scenario itself does most of the work of moving the cost. Two things come after that: the petrol that got in as a share of what the tank takes, then the spot your car is in and whether our van can reach it safely.
Three queries come first, before quoting, instead of after — what went in, how much, has it run — and this is the reason. Those answers are what change a range into one firm number.
About Higher Cloughfold, briefly
Higher Cloughfold is a suburban area in Lancashire, situated near the River Irwell and characterised by its terraced housing. Higher Cloughfold sits at an elevation of 215 metres, overlooking the surrounding countryside. Higher Cloughfold is located near several smaller communities, including Lower Cloughfold and Cloughfold, and is within commuting distance of Salford.
Across Lancashire and around Higher Cloughfold: fuel drain cover
Petrol in diesel calls in Higher Cloughfold — part of the BB postcode area — go to vans that likewise cover the places about it, Lower Cloughfold, Cloughfold and Hareholme included. The car doesn't need to come to us: our technicians drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
Still at the petrol pump in Higher Cloughfold?
Then, you could not be in a better place. Switched off it stays; then phone.