Raby Park: Petrol in a Diesel Car? How Worried to Be
Not started? Then less anxious than you probably feel. Petrol resting in a diesel tank does nothing to the engine until something draws it through your fuel system — the ignition priming the pump, the starter, or driving on its own. So the truthful answer to the first query everyone around Raby Park asks, "have I ruined it?", is generally no. Keep it that way: leave the motor off then phone Petrol in Diesel. The rest of this page covers what petrol really does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you a second time.
What petrol in a diesel does to the engine
Diesel has two jobs on its way through an engine. It protects first, and after that does it burn. Extremely fine gaps are built into your injectors and the high-pressure pump, and only the diesel flowing through keeps their surfaces from grinding together.
The second task petrol does not do at all, and the first it does poorly. It is runnier than diesel and strips away the protection the system depends on, so a pump running on a petrol mix is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the knocking comes from.
Together, those leave the shape of the trouble plain. Contact doesn't do the damage — movement does. Petrol in a tank is a fuel problem. The beginning of a mechanical problem is a pump that has been labouring on that petrol — and whatever a worn pump sheds travels on with your fuel to the injectors beyond it.
Petrol in a diesel around Raby Park: how serious is it? Four situations
Fuelled up, never started. The best case there can be. The petrol is in your tank and just that tank, and the task is a drain and a flush where the vehicle sits. This is the one situation that can only truly occur at a forecourt, because anywhere else your car has been driven to get there.
A brief spell of running, or merely the ignition on. Petrol has come out of the tank and got to the fuel filter and the fuel lines, since the fuel system has been bled. Still usually straightforward: drain, flush, and your filter sorted.
A few miles driven, and the pump has spent each of them running on thinned fuel. How hard your car was driven matters as much as how far, and this work takes in that tank, the fuel lines, the fuel filter and clean fuel through the entire system. The school run to Crossley Street Primary School is one thing. Very different once more: a trip to Leeds, under 15 miles away, or any miles on the A1(M), under a mile from Raby Park, where the motor kept labouring hard.
Driven on till it complained — clattering, smoke, a ragged idle, a soft throttle. What you are hearing is your motor reporting fuel that no longer behaves like diesel. Leave it where it has stopped: a lay-by, a quiet street, the verge on Caxton Street. The drain and flush-through still go first, and they sort it out: if a car is pulled over quickly, lasting damage is very rare.
What Raby Park drivers get told about petrol in a diesel — and the myths in it
Myth: topping up to full with diesel makes it fine. It does not. Nothing is removed by topping up — you're left with a bigger tank, still the same mix. That advice assumes a diesel fuel system tolerates petrol by percentage. It doesn't.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. Smaller components and higher pressure are the way a current diesel runs its fuel, and that makes the protection matter more, not less.
One myth that catches motorists off guard: if it starts and drives, it must be unharmed. Diesel in a petrol motor generally leaves a motor that won't run: the motorist stops, and so does the harm. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile the pump wears. Being able to run isn't proof of being fine.
An outdated workaround for a separate fault is behind this one. Myth: "Add some two-stroke oil and drive the car home." It does not put back what petrol has weakened, and the petrol is still inside the tank later on.
The next start draws petrol back round your pump from the fuel lines and your filter, where some of it sits once your engine has run. That's why draining your tank yourself does not leave you sorted — a myth. Draining petrol into a can by the kerbside is also genuinely dangerous.
How does petrol in a diesel happen?
It's rarely carelessness, and nobody does it on purpose. The petrol nozzle is the smaller of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol vehicle at all. The forecourt makes it easy, and the mistake runs one way.
Habit and the vehicle falling out of step is when it occurs. Hire cars, courtesy cars, and vehicles that are new to you. Two motors on one driveway, one petrol, one diesel. The pumps in a different order on a familiar forecourt. A rushed fill en route to Cattal with a train to catch. The first fill-up in a diesel Volkswagen Passat after years of driving petrol is precisely the moment it takes place. The hand does what it has always done when you add rain, a phone call or a back seat full of kids.
Raby Park drivers: how to avoid petrol in a diesel next time
- Read the pump, not the colour. In the UK unleaded handles are generally green and diesel black, but not on every forecourt. The label is what matters.
- Check the filler flap. Plenty of cars state the fuel type inside the flap or on the cap. Look at it on the first fill in a car you don't know.
- One of each in the household? Mark your key to your diesel — a bright fob, a sticker — because meaning to remember is not enough.
- "Diesel", out loud, before you pick up the nozzle — each time a new or hired car needs its first tank. It sounds silly. It works.
- Tuck your phone away. This is an easy mistake to make whilst you are thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to reject a petrol nozzle, and add-on devices are available for cars without one. They are a safety net, not a reason to stop checking the petrol pump.
- Stop as soon as you notice. Less petrol in the tank means a weaker blend. It doesn't change what to do next, which is still not to start the car.
Raby Park: already put petrol in a diesel?
The order of things is short, then. Do not switch your ignition on, and don't fire it up. Ask the staff to help you roll it away from the pump if you are still on the forecourt, whether that is Shell or somewhere else. What went in, about how much, and whether it's run: tell us that when you ring 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a different problem — Raby Park has a page all for it.
Raby Park petrol in a diesel tasks: why one costs more than another
The four situations above are four separate jobs, so no single quote for this would be honest. The scenario itself does most of the work of moving the cost. Two things come after that: the petrol that was put in as a proportion of what your tank holds, then the spot your car is in and whether a van can reach it safely.
Before any quote, not after, we ask three queries: the fuel that was put in, its volume, and if it has run. That's why. Those answers turn a range into a straight figure.
About Raby Park and its setting
Raby Park is a suburban area located on the riverside in West Yorkshire, with a relatively low elevation of 31 metres. Raby Park sits near the cities of Leeds and Wetherby, and is close to smaller communities like Micklethwaite Village and Hallfield. Raby Park is characterized by a high proportion of flat housing, and is home to a population of approximately 3758 residents. Raby Park is situated about 11 miles from Leeds and 175 miles from London.
Fuel drain cover around Raby Park and across West Yorkshire
Wetherby, Micklethwaite Village and Hallfield are among the spots near Raby Park that the same teams work, answering petrol in diesel jobs across Raby Park's LS postcode area. The car does not need to come to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
Still at the petrol pump around Raby Park?
The best spot there is, then — that is where you are. Keep it off. Phone.