Should You Worry? Petrol in a Diesel Car in Huntley
Not started? Then less worried than you likely are. Till the ignition primes your pump, your starter cranks, or your vehicle is driven, petrol in a diesel tank simply sits there and does nothing. Which means the truthful reply to that first Huntley question — "have I wrecked it?" — normally no. Leave your engine off then phone Petrol in Diesel — that keeps it like that. The remainder of this page explains what petrol really does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you again.
What petrol in a diesel does to the motor
On its way through a motor, diesel has two tasks. It burns, and before it burns it lubricates. Very fine gaps go into the injectors and the high-pressure pump, and just the diesel running through keeps their surfaces from grinding together.
Of these two jobs, petrol manages the first badly and the second not at all. It's runnier than diesel and takes away the protection your fuel system rests on, and so a pump running on a petrol mixture is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That's where the clattering comes from.
Taken together, they show what shape the issue has. Contact does not do the damage — circulation does. Where the petrol is only inside your tank, it's a problem of fuel, nothing more. The beginning of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with the fuel to your injectors downstream.
Huntley, petrol in a diesel: four cases, from mild to serious
Filled up, and not started: no case is better. Being on a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With that petrol held in your tank alone, it is drained and purged on the spot, and nothing more is needed.
Started for a moment, or only the ignition on. The fuel system has been bled, so petrol has left your tank and reached the filter and the fuel lines. Still usually easy: drain, flush, and your filter dealt with.
Those few miles driven meant the pump labouring on fuel thinned by petrol the whole way. Miles is only half of that; how hard it was driven matters just as much. Either way this work includes the tank, the fuel lines, the filter and clean fuel through the whole circuit. On the school run to Huntley Church of England Primary School, the mileage is small. A run as far as Gloucester, under 10 miles away, is a very different job. So is any distance on the M50, under 10 miles from Huntley, where your engine has been running hard the whole time.
Driven until it complained. Knocking, an uneven idle, smoke, a throttle that has gone soft. The fuel isn't acting like diesel any more, and the engine is telling you. Leave it where it has stopped: a lay-by, a quiet street, the verge on North Road. A vehicle stopped quickly very seldom has long-term damage, as the fuel drain and the flush, which still go first, take care of it.
Huntley motorists and that petrol in a diesel myths they hear
False: topping up to full with diesel makes it fine. It doesn't. A fuller tank of the same mixture is all you get, since topping up removes nothing. That guidance presumes a diesel fuel system handles petrol by percentage. It doesn't.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." At higher pressure, through more precise parts: that is how a modern diesel handles its fuel, and so the protection counts more, not less.
One myth that catches motorists off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it normally will not run, and so the motorist stops — and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile your pump grinds. Fine and running aren't the same at all.
An old fix for a different problem is behind this one. Myth: "Add some two-stroke oil and drive it home." The petrol is still inside that tank afterwards, and what it has diluted is not put back.
Myth: "Drain the tank yourself and you are sorted." Once the engine has been run, some of the petrol is no longer in that tank: it's in your filter and your lines, and it goes straight back through your pump on your next start. Also, a can of petrol filled by the roadside is truly risky.
How does petrol in a diesel take place?
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle generally won't go into a petrol car, but the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake easy, and just in one direction.
It happens when habit and the car stop matching. Courtesy car, hire car, or a car that is brand new. Two motors on one drive, one petrol, one diesel. Your normal forecourt, its pumps suddenly in a different order. A train to catch, and a hurried fill on the way to Gloucester. The first fill-up in a diesel Renault Megane after years of driving petrol is precisely the moment it occurs. Add a back seat full of children, a phone call or rain, and the hand takes over.
Next time you fill up around Huntley: preventing petrol in a diesel
- Check the pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on every forecourt. The label is what matters.
- Inspect the filler flap. Many motors state the fuel inside the flap or on the cap. Look at it on your first fill in any car you do not 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.
- Before the nozzle leaves the petrol pump the first time you fill a hired or new car, say "diesel" aloud. Silly, perhaps, but it does the trick.
- While you are thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to refuse a petrol nozzle, and add-on devices are available for the remainder. Treat it as a backstop, then keep reading the pump.
- Stop the moment you realise. Less petrol in the tank makes a thinner mixture. It doesn't change what to do next, which is still not to start the vehicle.
Huntley: already put petrol in a diesel?
Then the order of things is brief. Do not turn your ignition on, and don't crank it. Ask the staff to help you roll it clear of the pump if you're still on the forecourt, whether that is Valero or anywhere else. Then phone 0333 366 0103 and tell us what went in, about how much, and if it has run.
Corrosion and deposits form the trouble with AdBlue, where petrol brings lost lubrication. So if it was AdBlue, say so — and see its own Huntley page.
Why one petrol in a diesel job in Huntley costs more than another
There is no fair single quote for this, since the four situations above are four separate jobs. The scenario itself does most of the work of moving the cost. The proportion matters next, meaning how much of your tank is petrol, and then the position of the vehicle and whether reaching it is safe for a technician.
Ahead of any quote, not after, we ask three questions: your fuel that got in, its volume, and if it has run. That's why. Those replies turn a range into a straight figure.
About Huntley and its setting
Huntley is a small village in Gloucestershire, situated inland at an elevation of 59 metres, approximately 6.8 miles from Gloucester. Huntley has a population of around 787 residents, with predominantly detached housing. Huntley is surrounded by nearby places such as Little London, Upper Ley, and Ganders Green, and is about 100.7 miles west of London.
Across Gloucestershire and in Huntley: fuel drain cover
Petrol in diesel jobs in Huntley — part of the GL postcode area — go to teams that also cover the places round it, Little London, Upper Ley and Ganders Green included. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations our engineers work, and your vehicle does not need to come to us.
At the petrol pump in Huntley, right now?
Then, you couldn't be in a better position. Keep it off. Phone.