Should You Worry? Petrol in a Diesel Car in Wootton
Probably less than you already are — provided no one has started the car. "Have I ruined it?" is the first question anyone in Wootton asks, and the honest answer is generally no, since petrol left in a diesel tank harms nothing until it's dragged through the system — by ignition priming, by your starter, or by driving. Keep it like that: leave the engine off then ring Petrol in Diesel. The remainder of this page sets out what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you again.
Petrol in a diesel: what does it do to the engine?
Passing through a motor, diesel is doing two jobs at once. Oiling comes before burning; it does both. Your high-pressure pump and the injectors are built to extremely fine clearances, and your diesel passing through them is what keeps those surfaces from grinding against each other.
Badly at the first, not at all at the second: that is petrol. The clattering comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips away the lubrication your system depends on, and any pump running on that blend is wearing itself.
Put those together and the shape of the trouble is clear. Not contact but circulation is what causes the damage. All a tank with petrol in it amounts to is a fuel problem. The beginning of a mechanical problem is a pump that has been running on that petrol — and whatever a worn pump sheds travels on with the fuel to your injectors downstream.
Four scenarios our engineers see in Wootton: how bad is petrol in a diesel?
Fuelled but never started — the best it gets. Being on a forecourt is what makes this the case: elsewhere, your car has been driven there to begin with. With that petrol kept in your tank alone, it's emptied and cleaned right where it stands, and nothing more is needed.
Your ignition turned on, or a short start. Once primed, your system has drawn petrol from your tank up to the fuel filter and the fuel lines. Drain, flush, see to the fuel filter: still normally straightforward.
A few miles driven, and the pump has spent every one of them running on thinned fuel. Miles is only half of that; how hard it was driven counts equally. Either way the work runs to that tank, the fuel lines, the filter and fresh fuel through the whole system. The school run to Woodstock Church of England Primary School is one matter. A run as far as Oxford, under 10 miles away, is a very different job. So is any distance on the M40, under 10 miles from Wootton, where your engine has been working hard the whole time.
Driven till it complained. Knocking, an uneven idle, smoke, a throttle that has gone soft. What you are hearing is your engine reporting fuel that no longer runs like diesel. Leave it where it has stopped: a lay-by, a side street, the verge on Castle Road. The fuel drain and flush still go first, and they deal with it: when a vehicle is stopped quickly, permanent damage is very uncommon.
Petrol in a diesel myths Wootton people hear
False: topping up to full with diesel makes it fine. It does not. Nothing is removed by topping up — you are left with a bigger tank, still the same mixture. Percentage isn't how a diesel fuel system copes with petrol, whatever that guidance supposes.
If anything, the reverse is true. Myth: "A modern diesel can cope with a bit of petrol." At higher pressure, through finer parts: that is how a newer diesel handles its fuel, so the lubrication matters for more, not less.
One myth that catches people off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it normally won't run, and so the driver stops — and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile your pump grinds. Running isn't the same as fine.
An old workaround for a different fault lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." What petrol has weakened remains thinned, and that petrol stays inside your tank anyway.
Once your engine has run, part of that petrol sits in the fuel filter and the fuel lines, not that tank — and the next start pulls it right back through the pump. So the myth "drain that tank yourself and you're sorted" does not stand up. Emptying petrol into a can at the kerbside is also really risky.
How does petrol in a diesel happen?
Carelessness is rarely the cause, and nobody means to do it. A diesel nozzle generally will not fit a petrol vehicle, but the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error easy, and only in one direction.
When habit and your car stop matching, it occurs. A new vehicle, a hire car or a courtesy car. Households running one of each, petrol and diesel. A forecourt you know, but with its pumps laid out differently. A rushed fill en route to Tackley with a train to catch. Years of petrol motors behind you, a diesel Renault Clio in front of you on the forecourt for its first tank — that's when. Add rain, a phone call or a back seat full of children, and your hand repeats what it has always done.
Next time you fill up in Wootton: avoiding petrol in a diesel
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most usually do. Check the pump's label; the colour is just a hint.
- Check your filler flap. Many cars state the fuel inside the flap or on the cap. Look at it on the first fill in a motor you do not know.
- Mark the key. In a house with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the petrol pump. It seems silly and it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, and so put your phone away and keep your mind on the petrol pump.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to block a petrol nozzle, and aftermarket devices are available for the remainder. Treat it as a safety net, then keep checking the petrol pump.
- Less petrol means a thinner blend, so stop as soon as you notice — while remembering that the next stage is unchanged. It's still not to crank it.
Wootton: already put petrol in a diesel?
The order of things is brief, then. Starting it is out, and so is turning on the ignition. The staff at the forecourt — whether at Gulf itself or wherever you filled up — will normally help push it clear of the pump if you ask. Next, 0333 366 0103. We will ask what went in, roughly how much, and if it's been run.
Say so if it was AdBlue instead of petrol: it's a separate fault, with its own page for Wootton, since AdBlue brings corrosion and deposits instead of lost lubrication.
One petrol in a diesel task around Wootton costs more than another. Why?
Four separate tasks lie behind the four scenarios above — which is why there is no honest single quote. The scenario itself does most of the work of moving your cost. Where the vehicle is counts too, and whether a technician can safely reach it, after the proportion of petrol to what your tank takes.
That's why our technicians ask three queries before quoting rather than after: what went in, how much, and if it's run. A range becomes a straight figure once the replies are in.
About Wootton and where it is
Wootton is a small village in Oxfordshire, situated on the banks of a river at an elevation of around 113 metres. Wootton lies near the larger town of Woodstock and is close to other nearby villages such as Woodleys and Glympton. Wootton has a population of approximately 602 residents and is characterised by semi-detached housing. Wootton is located about 9.8 miles from Oxford and 58.8 miles from London.
Wootton and Oxfordshire: where our fuel drain cover runs
Petrol in diesel jobs in Wootton — part of the OX postcode area — go to teams that also cover the spots about it, Woodleys, Glympton and Old Woodstock included. The vehicle doesn't need to move to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
In Wootton and still at the pump?
The best position there is, then — that's where you are. Leave the vehicle turned off, then ring.