Hartpury: Petrol in a Diesel Car? How Worried to Be
Unstarted? Then less anxious than you probably are. "Have I ruined it?" is the first thing everyone around Hartpury asks, and the truthful answer is normally no, since petrol resting in a diesel tank harms nothing till it's drawn through the fuel system — by ignition priming, by your starter, or by being driven. Leave the motor off and phone Petrol in Diesel — that keeps it that way. Further down, you will find what petrol really does inside a diesel, how far it might have gone, and how to stop it happening to you again.
Inside your engine: what petrol in a diesel really does
On its way through a motor, diesel has two jobs. It combusts, and before it combusts it protects. The high-pressure pump and your injectors are designed to very fine clearances, and your diesel passing through them is what stops those surfaces from wearing against each other.
Of those two tasks, petrol manages the first badly and the second never. The rattling comes from petrol being designed not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips out the protection the system hinges on, and any pump running on such a mix is wearing itself.
Combined, those leave the shape of the issue clear. Not contact but circulation is what causes the harm. Where the petrol is only inside that tank, it is an issue of fuel, nothing more. After your pump has been running on that petrol, a mechanical issue has begun: anything shed by a pump that is grinding is carried onward to your injectors with your fuel.
How bad is petrol in a diesel? Four situations we see in Hartpury
Filled up, not once started. The best case there can be. That petrol is inside that tank and just your tank, and the job is a drain and a flush where your car sits. This is the one scenario that can only truly occur at a forecourt, because anywhere else the car has been driven to get there.
Ignition on, or started for a second. With the system primed, the lines and filter now contain petrol that came from the tank. Normally little more than emptying, flushing and sorting the filter, and so still straightforward.
Some miles driven, and the pump has spent every one of them running on thinned fuel. Mileage is only half of it; how hard it was driven matters just as much. Either way this work includes that tank, the fuel lines, the filter and clean fuel through the whole circuit. On the school run to Hartpury Church of England Primary School, the mileage is small. Any mileage on the M50, under 10 miles from Hartpury, means the engine working hard throughout, and a run to Gloucester, under 5 miles away, makes a very different job too.
Driven on till it complained — clattering, smoke, a ragged idle, a dead throttle. That's the motor telling you its fuel no longer is behaving like diesel. Leave it where it has stopped: a lay-by, a side street, the verge on Broad Street. The drain and flush still come first, and they deal with it: when a car is pulled over early, permanent damage is very rare.
Hartpury motorists and the petrol in a diesel myths they hear
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Topping up takes out nothing; it gives you a fuller tank of the same mixture. A diesel fuel system does not accept petrol by percentage in the way that advice supposes.
If anything, the reverse holds. Myth: "A current diesel can cope with a bit of petrol." Lubrication counts more on current diesels, not less, because their fuel passes through more precise parts at higher pressure.
The myth that catches people out: if it starts and drives, it must be unharmed. Feed diesel to a petrol engine and it usually will not run, and so the driver stops — and the harm stops with them. Whilst your pump grinds, a diesel fed petrol usually starts, idles and drives away as though nothing has happened. Fine and running are not the same thing.
An outdated fix for a distinct fault is behind this one. Myth: "Add some two-stroke oil and drive it home." None of what petrol weakened gets put back by it — and afterwards, the tank still contains the petrol.
If the engine has run, part of the petrol is in the fuel filter and the fuel lines, not that tank — and your next start sends it right back through the pump. So the myth "drain that tank yourself and you are sorted" doesn't hold. It's also really hazardous to drain petrol into a can by the roadside.
Petrol in a diesel: how does it occur?
On purpose? Never. Through carelessness? Seldom, if ever. One way only, since of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, while the diesel one generally won't fit a petrol motor. That is how the forecourt makes it straightforward.
The moment routine stops matching your car is the moment it occurs. Courtesy car, hire car, or a motor that's new. A household with one petrol and one diesel on the drive. A familiar forecourt with the pumps in a different order. Rushing for a train outside Gloucester and fuelling up en route. Exactly the moment it occurs: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. Throw in a back seat full of kids, a phone call or rain, and the hand wins.
Next time you fill up around Hartpury: avoiding petrol in a diesel
- Read the pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on each forecourt. The label is what counts.
- The first fill in a strange car is the time to check your filler flap — on it, or on the cap, plenty of cars state which fuel to use.
- A coloured fob or a sticker on the diesel's key does more than any amount of intending to remember, in a house with one of each.
- "Diesel", aloud, before you lift the nozzle — every time a new or hired car gets its first tank. It sounds daft. It does the trick.
- Mistakes like this are simple to make while your mind is on something else, so the phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to reject a petrol nozzle, and add-on devices are available for vehicles without one. They are a backstop, not a reason to stop checking the pump.
- The moment you realise, stop: less petrol in the tank makes a thinner mixture. What to do next does not change, though — still don't crank it.
Already put petrol in a diesel around Hartpury?
The order of things is brief, then. Leave it unstarted, with your ignition off as well. The staff on the forecourt — whether at BP itself or wherever you filled up — will normally help push it clear of the petrol pump if you ask. Next, 0333 366 0103. We'll ask what was put in, roughly how much, and if it has been run.
Corrosion and deposits form the issue with AdBlue, whereas petrol means lost lubrication. So if it was AdBlue, say so — and see its own Hartpury page.
Why one petrol in a diesel task in Hartpury costs more than another
The four situations above are four different tasks, so no single quote for this would be fair. Which of them you are in is chiefly what moves the cost. Where your car is counts too, and whether our van can safely reach it, after the proportion of petrol to what the tank takes.
Ahead of any quote, not after, we ask three questions: your fuel that was put in, its amount, and if it has run. That's why. A range becomes a straight figure once the replies are in.
About Hartpury
Hartpury is a small village in Gloucestershire, situated near the city of Gloucester and surrounded by nearby places such as Longridge, Woolridge, and Ashleworth. Hartpury sits inland at an elevation of 46 metres, with detached housing being the predominant type of accommodation. Hartpury is located approximately 97 miles west of London, and its rural setting is characteristic of the South West region. Hartpury has a population of around 611 residents, who live in a quiet, residential environment.
Fuel drain cover across Gloucestershire, Hartpury included
Petrol in diesel calls in Hartpury — part of the GL postcode area — go to teams that likewise cover the places about it, Longridge, Woolridge and Ashleworth included. Our technicians drain wherever the car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Still at the pump around Hartpury?
Then you are in the best place there can be. Keep it off. Phone.