How Worried Should You Be? Petrol in a Diesel Car in West End
Not started? Then less worried than you likely feel. Everyone in West End starts with "have I ruined it?", and the fair answer is normally no: petrol left in your tank of any diesel remains harmless till priming, cranking or driving draws it into the system. To leave it like that, ring Petrol in Diesel then leave the motor switched off. Keep reading for three things: the effect petrol has inside a diesel motor, the clues of how far it has spread, and the way to make sure you don't repeat it.
Petrol in a diesel: what does it do to the motor?
On its way through a motor, diesel has two jobs. It lubricates to begin with, and after that does it burn. Made to very fine tolerances, the injectors and the pump depend on your diesel flowing through them to stop their surfaces wearing against one another.
The second task petrol does not do at all, and the first it does poorly. Being less viscous than diesel, petrol strips out the protection a fuel system needs, so a pump running on the blend wearing itself. It's also made to resist igniting under compression — the opposite of what a diesel needs — which is where you get the clattering.
Together, those make the shape of the trouble clear. Contact doesn't do the damage — circulation does. Any tank with petrol in it is a fuel issue. A pump that has been working on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with the fuel to your injectors further on.
Four scenarios our engineers see in West End: how serious is petrol in a diesel?
Fuelled up, not once started. The best case there can be. Being at a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With the petrol held in the tank alone, it's emptied and rinsed on the spot, and nothing more is needed.
Ignition on, or started for a second. The fuel system has been primed, so petrol has left your tank and reached the fuel filter and the lines. Still normally simple: drain, flush, and your filter sorted.
A couple of miles driven, and the pump has spent each of them running on thinned fuel. The work is your tank, your lines, the filter and fresh fuel through the entire circuit, and how hard the vehicle was driven matters as much as how far. Driving the kids to Oswaldtwistle West End Primary School is one kind of trip. Any miles on the M65, under a mile from West End, means the motor has worked hard throughout, and a run to Preston, under 15 miles away, makes a very different job too.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone lumpy. That is your engine telling you its fuel no longer is acting like diesel. Leave it wherever it has stopped: a lay-by, a side street, the verge on Browning Avenue. The fuel drain and flush-through still go first, and they deal with it: if a car is stopped soon, permanent damage is very rare.
Myths West End drivers hear about petrol in a diesel
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 guidance supposes.
"Newer diesels can handle a little petrol" — a myth, and nearer the reverse. At higher pressure, through smaller components: that's how a modern diesel handles its fuel, so the protection matters for more, not less.
This is the one that catches motorists. Myth: "If it starts and drives, there's no harm done." Feed diesel to a petrol motor and it generally won't run, so the driver stops — and the harm stops with them. While the pump grinds, a diesel fed petrol usually starts, ticks over and drives away as if nothing has happened. Fine and running are not the same thing.
Myth: a two-stroke additive makes it safe to drive home. It is an old fix, supposed for another issue. It does not put back what petrol has thinned, and the petrol is still inside the tank afterwards.
Myth: "Drain that tank yourself and you are sorted." After the motor has been run, some of the petrol is no longer inside your tank: it's in the filter and the fuel lines, and it goes right back through your pump on the next start. It is also genuinely dangerous to drain petrol into a can at the kerbside.
How does petrol in a diesel happen?
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle mostly will not go into a petrol vehicle, yet the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error straightforward, and only in that direction.
Routine and the vehicle getting out of step is when it happens. A new vehicle, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. A forecourt you know, only with its pumps laid out differently. Rushing for a train at Church & Oswaldtwistle and fuelling up en route. Precisely the moment it occurs: after years of driving petrol, a driver 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 just does what it always has.
West End drivers: 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 generally do. Read the pump's label; the colour is only a clue.
- The first fill in a strange motor is the time to check your filler flap — inside it, or on the cap, many motors state which fuel they take.
- Mark the key. In a household with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- It seems silly and it works: on the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump.
- Whilst you're thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Some diesels have a filler built to reject a petrol nozzle, and devices you can add are available for motors without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the pump.
- Less petrol means a thinner mixture, so stop as soon as you realise — while remembering that your next stage is unchanged. It is still not to fire it up.
Petrol already in a diesel around West End? Start here
In that case, there's just a short order of things. Leave it unstarted, with your ignition off too. If you are still on the forecourt — the nearest petrol station or anywhere else — ask the staff to help you roll it clear of the petrol pump. What got in, roughly how much, and if it has run: tell us that when you ring 0333 366 0103.
If it was AdBlue and not petrol, say so. That is a different problem — corrosion and deposits rather than lost protection — and it has its own page for West End.
One petrol in a diesel job around West End costs more than another. Why?
Four separate jobs lie behind the four scenarios above — which is why there is no fair single price. What shifts the cost is chiefly which of them you are in. The proportion counts next, meaning how much of the tank is petrol, followed by the position of the vehicle and whether getting to it is safe for our van.
What went in, how much, and if it has run — three queries our engineers ask before pricing, not after, for exactly that reason. Those replies are what turn a range into one firm number.
About West End and its setting
West End is a suburban area in Lancashire, situated on the riverside with an elevation of 142 metres. West End lies approximately 12 miles from Preston and 182 miles from London, with nearby places including Stanhill, Cote Holme, and Foxhill Bank. West End has a population of around 3513 people and is characterised by semi-detached housing. West End forms a distinct residential community within the wider area.
West End and Lancashire: where our fuel drain cover runs
West End sits in the BB postcode area, and our teams that answer petrol in diesel calls there work the locations near it as well — Stanhill, Cote Holme and Foxhill Bank among them. The car does not need to move to us: our technicians drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
West End: still at the pump?
Then you're in the best place there can be. Switched off it stays; then call.