Fair Moor: Petrol in a Diesel Car? How Worried to Be
Less than you likely are, provided it has not been started. Petrol sitting in a diesel tank does nothing to the motor till something draws it through the fuel system — your ignition priming your pump, the starter, or the drive on its own. So the truthful answer to the first question anyone around Fair Moor asks, "have I ruined it?", is normally no. Keep it like that: leave the engine off and call Petrol in Diesel. Below, you will find what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you a second time.
Inside the motor: what petrol in a diesel really does
On its way through a motor, diesel does two tasks. Lubricating comes before burning; it does both. The high-pressure fuel pump and the fuel injectors are made to extremely fine gaps, and the diesel passing through them is what stops those surfaces from wearing down against one another.
The second job petrol doesn't do at all, and the first it does badly. A pump running on a petrol mixture is wearing itself out, since petrol is thinner than diesel and takes away the protection the fuel system relies on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that's where the knocking comes.
Together, those make the shape of the problem clear. The harm is done by movement, not by contact. Where that petrol is only inside your tank, it is a fault of fuel, nothing more. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with the fuel to the injectors further on.
Four situations our technicians see in Fair Moor: how bad is petrol in a diesel?
Filled up, not once started. The best case there can be. Being on a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With that petrol held in the tank alone, it's emptied and flushed right where it stands, and nothing more is needed.
Your ignition switched on, or a short start. Once primed, the fuel system has drawn petrol out of your tank up to the filter and the lines. Still usually easy: drain, flush, and the fuel filter seen to.
Those few miles driven were your pump working on fuel thinned by petrol the whole way. Distance is only half of it; how hard it was driven matters just as much. Either way the work runs to the tank, the lines, your filter and fresh fuel through the whole circuit. Driving the children to Morpeth All Saints Church of England First School is one sort of trip. A run as far as Newcastle upon Tyne, under 15 miles away, is a very different job. So is any distance on the A167(M), under 15 miles from Fair Moor, where your engine has been working hard throughout.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. What you are hearing is your motor signalling fuel that no longer runs like diesel. Whether it's the verge on Juniper Court, a lay-by or a side road, stop there and leave it. The fuel drain and flush-through still go first, and they take care of it: if a vehicle is pulled over soon, lasting damage is very uncommon.
Petrol in a diesel stories Fair Moor people hear
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing comes out when you top up — the tank simply holds more of the same mixture. A diesel fuel system doesn't accept petrol by percentage in the way that guidance assumes.
Not so: a current diesel copes with a bit of petrol. Rather, the opposite. At higher pressure, through smaller parts: that's how a modern diesel handles its fuel, so the protection counts for more, not less.
Myth: "If it starts and drives, there is no damage done." This is the one that fools people. A petrol engine fed diesel generally won't run, and so the driver stops and the damage stops with them. Whilst your pump wears, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Being able to run isn't proof of being fine.
Myth: "Add some two-stroke oil and drive it home." It's an outdated fix for a different problem. None of what petrol thinned gets put back by it — and later, your tank still holds the petrol.
Myth: "Drain your tank yourself and you are sorted." Once the engine has been run, some of the petrol is no longer inside that tank: it is in the fuel filter and the lines, and it goes straight back through your pump on the next start. On top of that, petrol emptied into a can by the road is truly hazardous.
How does petrol in a diesel take place?
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle generally will not go into a petrol motor, but the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error easy, and only in one direction.
It occurs when routine and your car stop matching. Any vehicle that is new to you — hired, on loan as a courtesy car, or just bought. Households running one of each, petrol and diesel. A familiar forecourt with the pumps in a different order. A train to catch, and a hurried fill en route to Morpeth. Precisely the moment it occurs: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. With rain, a call coming in, or a car full of children to deal with, your hand simply does what it has always done.
How to avoid petrol in a diesel on your next fill-up in Fair Moor
- Read 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 matters.
- Many motors state the fuel type inside the filler flap or on the cap, and so check there on the first fill in any motor you don't know.
- Label your key. In a home with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- "Diesel", aloud, before you lift the nozzle — every time a new or hired car gets its first tank. It seems daft. It works.
- Thinking about something else is when this becomes an easy mistake to make, so tuck the phone away then keep your mind on the petrol pump.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to refuse a petrol nozzle, and add-on devices are available for cars without one. They are a safety net, not a reason to stop checking the petrol pump.
- Stop as soon as you realise. Less petrol in the tank makes a thinner mix. It doesn't change what to do next, which is still not to start the car.
Already put petrol in a diesel around Fair Moor?
Then the order of things is short. Starting it is out, and so is turning on your ignition. Ask the staff to help you roll it away from the pump if you are still at the forecourt, whether that is Shell or anywhere else. Then call 0333 366 0103 and tell us what was put in, roughly how much, and if it's run.
If it was AdBlue instead of petrol, say so. That is a different fault — corrosion and deposits instead of lost protection — and it has its own page for Fair Moor.
Why one petrol in a diesel job around Fair Moor costs more than another
There's no fair single price for this, because the four scenarios above are four different jobs. The scenario itself does most of the work of moving your cost. Two things follow that: the petrol that got in as a proportion of what the tank holds, then the spot the car is in and whether a technician can get to it safely.
Three queries come first, before any quote, instead of after — what was put in, how much, has it run — and this is the reason. Those replies are what change a range into one firm number.
About Fair Moor itself
Fair Moor is a village situated on the riverside in Northumberland, with a population of around 957 residents. Fair Moor has a mix of housing types, but detached homes are the most predominant. Fair Moor sits at an elevation of 74 metres, near the cities of Newcastle upon Tyne and Morpeth. Fair Moor is located near other nearby places such as Mitford and High Church.
Fuel drain cover around Fair Moor and across Northumberland
Fair Moor sits in the NE postcode area, and our teams that answer petrol in diesel calls there work the locations near it as well — Mitford, Morpeth and High Church among them. Our engineers drain wherever the vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
At the pump around Fair Moor, right now?
Then you're in the best spot there can be. Switched off it remains; then call.