Westford: Petrol in a Diesel Car? How Worried to Be
Far less than you likely are, provided it has not been started. Petrol sitting in a diesel tank does nothing to the motor until something draws it through your fuel system — the ignition priming your pump, your starter, or the drive on its own. So the truthful answer to the first query anyone around Westford asks, "have I ruined it?", is generally no. To keep the vehicle that way, phone Petrol in Diesel then leave your engine switched off. Below, this page sets out what petrol actually does inside a diesel, how far it may have got, and how to stop it happening to you again.
What petrol in a diesel does to the engine
On its way through a motor, diesel has two tasks. It burns, and before it ignites it protects. Very fine clearances go into the fuel injectors and the high-pressure pump, and only the diesel running through keeps those surfaces from grinding together.
Of these two jobs, petrol manages the first poorly and the second never. The clattering comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips away the lubrication the fuel system hinges on, and any pump working on such a blend is wearing itself.
Put these together and the shape of the issue is plain. The damage is done by circulation, not by contact. Any tank with petrol in it is a fuel problem. The start of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with your fuel to the injectors downstream.
Petrol in a diesel in Westford: how serious is it? Four cases
Fuelled up, not once started. The best case there is. On a forecourt, and genuinely only there, the petrol is still confined to your tank — since anywhere else the vehicle was driven to get to it. The task is draining and flushing on the spot.
Ignition on, or started for a moment. Once primed, the fuel system has pulled petrol from your tank as far as the fuel filter and your lines. Usually nothing more than clearing, purging and seeing to the fuel filter, so still straightforward.
Those few miles on the road were your pump running on fuel weakened by petrol throughout. The work is that tank, the fuel lines, the filter and fresh fuel through the whole system, and how hard your car was driven matters as much as how far. A school run to Rockwell Green Church of England Primary School is one matter. Any mileage on the M5, under 3 miles from Westford, means your engine has worked hard throughout, and a run to Exeter, under 25 miles away, makes a very different job as well.
Driven till it protested. Clattering, a lumpy idle, smoke, a throttle that has gone soft. The fuel isn't behaving like diesel any more, and your engine is telling you. Leave it where it stops: a lay-by, a quiet street, the verge on Payton Road. A vehicle pulled over early very seldom has lasting damage, since the drain and the flush, which still go first, sort it out.
Westford drivers and that petrol in a diesel myths they hear
Myth: topping up to full with diesel makes it fine. It does not. Topping up takes out nothing; it gives you a bigger tank of the same mixture. The idea behind the guidance — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: a newer diesel copes with a bit of petrol. Rather, the reverse. A modern diesel sends its fuel through smaller components at higher pressure, which makes the protection count more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that catches motorists. Feed diesel to a petrol motor and it normally will not run, and so the motorist stops — and the harm 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 the pump wears. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive the car home." It's an outdated workaround for a distinct problem. The petrol is still inside the tank afterwards, and whatever it has weakened isn't put back.
If the engine has been run, part of the petrol sits in the filter and the fuel lines, not the tank — and your next start sends it straight back through your pump. So the myth "drain the tank yourself and you are sorted" does not hold. Clearing petrol into a can at the kerbside is also genuinely hazardous.
Petrol in a diesel: how does it take place?
On purpose? Never. Through carelessness? Seldom, if ever. The petrol nozzle is the smaller of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol vehicle at all. The forecourt makes it easy, and the slip runs one way.
When habit and your car stop matching, it occurs. Any car that's new to you — a hire car, on loan as a courtesy car, or just bought. Households running one of each, petrol and diesel. The pumps in a different order on a familiar forecourt. Filling up in a hurry en route to Tiverton Parkway, with a train to catch. Exactly the moment it happens: after years of driving petrol, someone fills a diesel Volkswagen Passat for the first time. Your hand does what it has always done once you add rain, a phone call or a back seat full of children.
How to prevent petrol in a diesel at your next fill-up around Westford
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most generally do. Check the petrol pump's label; the colour is only a hint.
- In a vehicle you do not know, look inside the flap over your filler or at the cap before the first fill: plenty of vehicles print the fuel type there.
- One of each in the household? Label the key to your diesel — a coloured fob, a sticker — since intending to remember is not enough.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump. It seems daft and it works.
- Thinking about something else is when this becomes an easy mistake to make, and so put the phone away then keep your mind on the petrol pump.
- Add-on devices are available for vehicles without one, and some diesels come with a filler that won't take a petrol nozzle. Helpful — but a safety net at best, never a reason to stop checking the label.
- Noticing it halfway? Stop there and then. A thinner blend follows from less petrol inside the tank, yet the next step remains the same: do not start the car.
Westford: already put petrol in a diesel?
Short and simple, then, is the order of things. Do not start the vehicle, and do not turn the ignition on. Ask the attendants to help you push it away from the pump if you're still at the forecourt, whether that is BP or somewhere else. What went in, about how much, and if it has run: tell us those when you phone 0333 366 0103.
If it was AdBlue rather than petrol, say so. That's a separate issue — corrosion and deposits and not lost protection — and it has its own page for Westford.
Westford petrol in a diesel jobs: why one costs more than another
There is no fair single quote for this, since the four situations above are four separate jobs. The situation itself does most of the work of moving the cost. The share matters next, meaning how much of your tank is petrol, followed by the location of your car and whether getting to it is safe for our van.
What went in, how much, and if it's run — three questions our technicians ask before quoting, not after, for precisely that reason. A range becomes a straight figure when the answers are in.
About Westford
Westford is a village situated in a riverside setting in Somerset, with a mix of detached housing and a population of around 1158 residents. Westford lies near the villages of Rockwell Green, Payton, and Bagley Green, and is approximately 21 miles from Exeter. Westford's elevation is around 65 metres above sea level, and it is located in the South West region of England, about 140 miles from London. Westford remains a small, rural community with a strong sense of local identity.
Westford and Somerset: where our fuel drain cover reaches
Westford waits in the TA postcode area, and the teams that answer petrol in diesel jobs there work the spots around it as well — Rockwell Green, Payton and Bagley Green among them. The vehicle does not need to come to us: we drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Westford: still at the pump?
Then you're in the best place there is. Keep it off. Ring.