Should You Worry? Petrol in a Diesel Car in Weston Green
Provided it has not been started, worry less than you probably are. Petrol resting in a diesel tank does nothing to the motor till something draws it through your fuel system — your ignition priming the pump, the starter, or driving itself. So the truthful answer to the first query everyone in Weston Green asks, "have I ruined it?", is normally no. Leave your engine off and call Petrol in Diesel — that keeps it that way. Below, this page sets out what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you a second time.
Petrol in a diesel: what does it do to the motor?
Passing through an engine, diesel is doing two jobs at once. It combusts, and before it combusts it lubricates. Very fine gaps are built into the fuel injectors and the high-pressure pump, and only your diesel running through keeps their surfaces from grinding together.
Poorly at the first, not at all at the second: that is petrol. The rattling comes from petrol being made not to ignite when compressed, which is precisely the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection the system rests on, and any pump running on that blend is wearing itself.
Taken together, they show what shape the trouble has. The harm is done by movement, not by contact. Any tank with petrol in it is a fuel issue. The start of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with your fuel to your injectors beyond it.
Weston Green, petrol in a diesel: four situations, from mild to serious
Filled but not once started — as good as it gets. That petrol is in that tank and only the tank, and the job is a drain and a flush where the car stands. This is the one scenario that can only really take place on a forecourt, as anywhere else your car has been driven to get there.
A brief spell of running, or merely the ignition on. Once primed, your system has pulled petrol out of the tank as far as your filter and the lines. Normally little more than emptying, purging and sorting your filter, so still easy.
Those few miles driven meant your pump running on fuel diluted by petrol the whole way. Mileage is only half of that; how hard it was driven matters equally. Either way the work includes the tank, your lines, your filter and fresh fuel through the whole circuit. The school run to St Paul's Catholic Primary School, Thames Ditton is one thing. Getting as far as Westminster, under 15 miles away, makes a very different task — as does any mileage on the M3, under 5 miles from Weston Green, with the engine labouring hard all the way.
It complained, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone ragged. The engine is telling you your fuel is no longer acting like diesel. Pull up wherever you are — the verge on Newlands Avenue, a lay-by, a side street — then leave the car there. A car pulled over quickly very seldom has lasting damage, as the fuel drain and the flush-through, which still go first, take care of it.
Petrol in a diesel stories Weston Green people hear
"Top it up the rest of the way with diesel and it will be fine" — a myth. It will not. Nothing is removed when you top up — your tank simply carries more of the same mixture. A diesel fuel system doesn't accept petrol by percentage in the way that guidance presumes.
If anything, the reverse holds. Myth: "A current diesel can cope with a bit of petrol." A newer diesel runs its fuel through more precise components at higher pressure, which makes the protection count more, not less.
One myth that catches people out: if it starts and drives, it must be unharmed. Diesel in a petrol motor normally leaves a motor that will not run: the motorist stops, and so does the harm. Feed petrol to a diesel and it generally fires up, idles and pulls away as if nothing happened — all while its pump wears. Being able to run isn't proof of being fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an outdated workaround for a distinct fault. What petrol has diluted remains diluted, and the petrol stays inside that tank anyway.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol lies in the filter and lines, ready to go right back through your pump at your next start. Also, a can of petrol filled at the kerbside is truly hazardous.
How it happens: petrol in a diesel
On purpose? Never. Through carelessness? Seldom, if ever. One way only, because of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, while the diesel one generally won't fit a petrol vehicle. That is how the forecourt makes it straightforward.
Habit and your car falling out of step is when it occurs. A motor that is new to you — a hire car, on loan as a courtesy car, or just bought. A household with one petrol and one diesel on the driveway. The pumps in a different order on a well-known forecourt. A hurried fill en route to Thames Ditton with a train to catch. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it takes place. Throw in rain, a phone call or a back seat full of children, and the hand does what it has always done.
Preventing petrol in a diesel next time you fill up in Weston Green
- Green for unleaded and black for diesel is normal in the UK — but not on every forecourt. Trust the label on the petrol pump, not the colour.
- Inspect the filler flap. Plenty of cars state the fuel type inside the flap or on the cap. Look at it on your first fill in a vehicle you don't know.
- One of each in the house? Label your key to the diesel — a coloured fob, a sticker — because meaning to remember is not enough.
- It sounds silly and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump.
- Whilst you are thinking about something else, this is an easy mistake to make — so put your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to refuse a petrol nozzle, and aftermarket devices exist for the remainder. Treat it as a safety net, and keep checking the pump.
- As soon as you realise, stop: less petrol in the tank makes a thinner blend. What to do next doesn't change, though — still don't fire it up.
Put petrol in a diesel around Weston Green already?
In that case, there's only a short order of things. Leave it unstarted, with your ignition off too. Ask the staff to help you push it away from the pump if you are still on the forecourt, whether that is Shell or somewhere else. Phone 0333 366 0103 next, with three answers — your fuel, the approximate volume, and if it has run.
Say so if it was AdBlue rather than petrol: it's a separate fault, with its own page for Weston Green, since AdBlue brings corrosion and deposits instead of lost lubrication.
Weston Green petrol in a diesel tasks: why one costs more than another
There's no honest single price for this, because the four scenarios above are four different jobs. The situation itself does most of the work of moving the cost. Beyond that it is the ratio — how much petrol got in against how much the tank takes — and after that where the vehicle is and whether our van can reach it safely.
Before any quote, not after, we ask three questions: your fuel that went in, the amount, and whether it has run. That is why. With those answers, there is a straight figure instead of a range.
About Weston Green and where it is
Weston Green is a village in Surrey, situated on the riverside near the Thames, with an elevation of around 13 metres. Weston Green lies close to several neighbouring villages, including Thames Ditton, Hinchley Wood, and Giggshill, and is approximately 12.6 miles from London. Weston Green has a population of around 2004 residents, who mostly live in detached houses. Weston Green is characterized by its tranquil riverside setting, which influences the local environment and community.
Across Surrey and around Weston Green: fuel drain cover
Thames Ditton, Hinchley Wood and Giggshill are among the places near Weston Green that the same vans work, answering petrol in diesel jobs across Weston Green's KT postcode area. The vehicle doesn't need to move to us: our engineers drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
At the pump in Weston Green, right now?
Nothing beats it: that's where you now are. Leave the vehicle switched off, then ring.