Should You Worry? Petrol in a Diesel Car in Hednesford
Less than you probably are, provided it hasn't been started. Everyone in Hednesford starts with "have I ruined it?", and the honest answer is usually no: petrol left inside the tank of a diesel stays harmless till priming, cranking or driving draws it into the fuel system. Petrol in Diesel is who to call, with your engine kept off, and so it stays that way. Keep reading for three things: the effect petrol has inside a diesel engine, the signs of how far it has spread, and ways to make sure you never do it again.
Petrol in a diesel: what does it do to your engine?
Two jobs fall to diesel on its journey through a motor. It ignites, and before it burns it protects. What keeps the surfaces inside the high-pressure pump and your injectors from grinding against each other is your diesel flowing through them — they are designed to very fine gaps.
Of those two tasks, petrol manages the first poorly and the second not at all. A pump running on a petrol mix is wearing itself out, since petrol is runnier than diesel and strips out the lubrication your fuel system depends on. Petrol is also made to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that is where the knocking comes.
Seen together, they make clear the shape the trouble takes. Not contact but movement is what does the damage. Petrol in a tank is a fuel problem. A pump that has been running on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the fuel injectors further on.
How bad is petrol in a diesel? Four situations we see in Hednesford
The best case there can be: filled up, never started. On a forecourt, and truly only there, that petrol is still limited to your tank — since everywhere else your car was driven to get to it. The task is draining and rinsing on the spot.
Started for a moment, or only your ignition on. The system has been primed, and so petrol has left that tank and got to the filter and the fuel lines. Usually little more than clearing, purging and sorting the filter, so still straightforward.
The pump has spent a few miles on weakened fuel — that's what driving the vehicle meant. The work is your tank, your lines, the filter and fresh fuel through the entire system, and how hard the vehicle was driven counts as much as how far. Short trips, such as the school run to Poppyfield Primary Academy, are one thing. A run as far as Lichfield, under 10 miles away, is a very different task. So is any mileage on the M6 Toll, under 3 miles from Hednesford, where the motor has been working hard throughout.
Rattling, a ragged idle, smoke, a throttle gone soft: driven till it complained. The engine is telling you the fuel is no longer behaving like diesel. Whether it's the verge on Market Street, a lay-by or a side road, stop where you are then leave it. What goes first is still the fuel drain and flush, and that takes care of it, with lasting damage very uncommon when a car is pulled over quickly.
What Hednesford people get told about petrol in a diesel — and the stories in it
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing is removed by topping up — you're left with a fuller tank, still the same mixture. A diesel fuel system doesn't accept petrol by percentage in the way that guidance presumes.
"Current diesels can handle a little petrol" — a myth, and nearer the reverse. Protection counts more on modern diesels, not less, because their fuel passes through smaller components at higher pressure.
This is the one that fools people. Myth: "If it starts and drives, there's no damage done." The driver of a petrol engine fed diesel normally has no choice but to stop, since it will not run, and the damage stops there. Whilst the pump grinds, a diesel fed petrol normally starts, ticks over and drives away as though nothing has happened. Running is not the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate fault. The petrol is still inside that tank afterwards, and what it has thinned is not put back.
Myth: "Drain the tank yourself and you are sorted." Once the motor has been run, some of the petrol is no longer in your tank: it is in the fuel filter and the fuel lines, and it goes right back through your pump on your next start. And, a can of petrol drained at the roadside is genuinely risky.
Why petrol in a diesel happens at all
On purpose? Never. Through carelessness? Seldom, if ever. One way only, since of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol car. That is how the forecourt makes it simple.
The moment routine stops matching the car is the moment it occurs. Courtesy car, hire car, or a vehicle that's new. One petrol and one diesel on the drive of the same household. Your usual forecourt, its pumps now in a different order. A rushed fill on the way to the nearest station with a train to catch. Years of petrol cars behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that's when. Throw in rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
Preventing petrol in a diesel next time you fill up in Hednesford
- The label is what matters, so check the petrol pump rather than the colour: in the UK unleaded handles are normally green and diesel black, but not on every forecourt.
- Plenty of cars state the fuel inside the filler flap or on the cap, so check it on the first fill in any vehicle you don't know.
- Good intentions do less than a sticker or a fob in a vivid colour on the diesel's key when a house has one of each. So label it.
- It sounds silly and it does the trick: on your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump.
- While you're thinking about something else, this is an easy mistake to make — so tuck your phone away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to block a petrol nozzle, and add-on devices exist for vehicles without one. They are a backstop, not a reason to stop reading the pump.
- Stop as soon as you realise. Less petrol inside that tank makes a thinner blend. It does not change what to do next, which is still not to fire it up.
Put petrol in a diesel in Hednesford already?
Short and simple, then, is the order of things. Do not crank it, and do not turn the ignition on. The attendants at the forecourt — whether at Texaco itself or wherever you filled up — will usually help push it clear of the petrol pump if you ask. What got in, about how much, and if it has run: tell us those when you phone 0333 366 0103.
If it was AdBlue instead of petrol, say so. That is a different fault — corrosion and deposits instead of lost protection — and it has its own page for Hednesford.
What makes one Hednesford petrol in a diesel task cost more than the next
There's no fair single quote for this, because the four situations above are four separate jobs. Chiefly, your cost shifts with which one you're in. Two things come after that: the petrol that was put in as a share of what that tank takes, then the place your car is in and whether a technician can get to it safely.
That's why we ask three queries before quoting rather than after: what was put in, how much, and if it has run. Given the replies, there is a straight figure rather than a range.
About Hednesford itself
Hednesford is a suburban area in Staffordshire, situated near the River Trent and close to the city of Lichfield. Hednesford sits at an elevation of 163 metres, with nearby neighbourhoods including West Hill, High Town, and Hill Top. Hednesford has a population of around 4291 people, predominantly living in semi-detached housing. Hednesford is located approximately 115 miles northwest of London, in the West Midlands region.
Across Staffordshire and around Hednesford: fuel drain cover
Our vans answering petrol in diesel call-outs around Hednesford, in the WS postcode area, equally work the places near it, West Hill, High Town and Hill Top included. The car 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.
Still at the pump in Hednesford?
Then you're in the best place there is. Turned off it remains; then phone.