Kettlethorpe: Petrol in a Diesel Car? How Worried to Be
Likely less than you already are — as long as nobody has started it. Till the ignition primes the pump, the starter cranks, or the vehicle is driven, petrol in a diesel tank just sits there and does no harm. Which makes the truthful reply to that first Kettlethorpe question — "have I ruined it?" — usually no. To keep the vehicle that way, ring Petrol in Diesel then leave the engine switched off. The rest of this page sets out what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it doesn't happen to you a second time.
Petrol in a diesel: what does it do to your engine?
Passing through a motor, diesel is doing two things at once. It ignites, and before it burns it protects. The high-pressure fuel pump and the injectors are built to very fine clearances, and your diesel passing through them is what stops those surfaces from wearing down against each other.
The second task petrol doesn't do at all, and the first it does poorly. A pump working on a petrol mixture is wearing itself out, because petrol is thinner than diesel and takes away the protection your fuel system depends on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that's where any clattering comes.
The shape of the problem is clear when you put those together. Contact doesn't do the damage — movement does. Petrol in the tank is a fuel problem. The beginning of a mechanical problem is a pump that has been running on that petrol — and whatever a worn pump sheds travels on with the fuel to your injectors beyond it.
How serious is petrol in a diesel? Four situations we see in Kettlethorpe
Fuelled up, not once started. The best case there is. At a forecourt, and genuinely only there, that petrol is still confined to your tank — since anywhere else your car was driven to reach it. The task is emptying and rinsing on the spot.
Ignition on, or started for a second. With the system primed, the lines and filter already hold petrol that has come from the tank. That is normally still a straightforward job — a drain, a flush, and the fuel filter seen to.
Driven a couple of miles. Now the pump has spent these miles running on thinned fuel. Miles is only half of that; how hard it was driven counts equally. Either way this work runs to the tank, the fuel lines, your filter and clean fuel through the entire circuit. The school run to Hendal Primary School is one thing. A run as far as Wakefield, under 3 miles away, is a very different task. So is any mileage on the M1, under a mile from Kettlethorpe, where the engine has been working hard the whole time.
Driven on until it protested — knocking, smoke, a ragged idle, a soft throttle. That is the motor telling you its fuel has stopped behaving like diesel. Stop where you are — on the verge on Kettlethorpe Road, at the kerb, down a side road — and do not move it. Lasting damage is very rare when a vehicle is stopped quickly, and the fuel drain and flush-through that still go first take care of it.
Kettlethorpe drivers and the petrol in a diesel myths they hear
Myth: "Fill it the rest of the way with diesel and it'll 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 tolerate petrol by percentage in the way that advice presumes.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. Protection matters more on modern diesels, not less, because their fuel runs through more precise components at higher pressure.
The myth that catches people off guard: if it starts and drives, it must be unharmed. Diesel in a petrol motor usually means a motor that won't run: the driver stops, and so does the damage. Whilst your pump grinds, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Running isn't the same as fine.
An old fix for a distinct problem lies behind this one. Myth: "Add some two-stroke oil and drive it home." It doesn't put back what petrol has thinned, and the petrol is still in that tank after that.
"Drain it yourself and you're sorted" — a myth, because after it's been running some petrol sits in the fuel filter and lines, waiting to go right back through your pump at the next start. Also, a can of petrol drained at the kerbside is genuinely risky.
Petrol in a diesel: how does it occur?
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle generally won't fit a petrol motor, but the smaller petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error simple, and only in that direction.
Routine and your car getting out of step is when it happens. Courtesy car, hire car, or a car that's new. Households running one of each, petrol and diesel. A forecourt you know, but with its pumps arranged differently. Fuelling up in a hurry on the way to Sandal & Agbrigg, with a train to catch. Precisely the moment it happens: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. With rain, a call coming in, or children to deal with, the hand simply does what it has always done.
Kettlethorpe drivers: how to avoid petrol in a diesel next time
- Read the pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on every forecourt. The label is what matters.
- In a car you do not know, look inside the flap over the filler or at the cap before the first fill: plenty of motors state the fuel type there.
- Label the key. In a house with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- Before the nozzle leaves the petrol pump the first time you fill a hired or new car, say "diesel" aloud. Daft, yes, yet it works.
- Thinking about something else is when this becomes an easy mistake to make, so put your phone away then keep your mind on the pump.
- Some diesels come with a filler built to block a petrol nozzle, and devices you can add are available for motors without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump.
- Spotting it halfway? Stop at once. A weaker blend results from less petrol inside that tank, but the next stage stays the same: do not start the vehicle.
Already put petrol in a diesel in Kettlethorpe?
Then the order of things is brief. Starting it is out, and so is turning on your ignition. The staff on the forecourt — whether at Asda itself or wherever you filled up — will normally help roll it clear of the petrol pump if you ask. Then phone 0333 366 0103 and tell us what got in, about how much, and if it's run.
Corrosion and deposits form the problem with AdBlue, whereas petrol brings lost lubrication. So if it was AdBlue, say so — and read its own Kettlethorpe page.
Kettlethorpe petrol in a diesel jobs: why one costs more than another
The four scenarios above are four different jobs, so no single quote for this would be honest. Mostly, the 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 holds, then the spot the vehicle is in and whether a technician can get to it safely.
That is why our engineers ask three queries before pricing instead of after: what was put in, how much, and whether it has run. Their answers are what change a range into one firm number.
About Kettlethorpe and where it is
Kettlethorpe is a suburban area situated on the riverside in West Yorkshire, with a mix of semi-detached housing and local amenities. Kettlethorpe lies close to the city of Wakefield, approximately 2.8 miles away, and is near other local places such as Newmillerdam and Stand Bridge. Kettlethorpe has a population of around 3029 residents and is located at an elevation of 42 metres. Kettlethorpe is part of the wider Wakefield urban area, within commuting distance of larger cities in the region.
Across West Yorkshire and around Kettlethorpe: fuel drain cover
Our vans answering petrol in diesel jobs in Kettlethorpe, in the WF postcode area, also work the locations around it, Newmillerdam, Hill Top and Stand Bridge included. Our engineers drain wherever your vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Kettlethorpe: still at the pump?
No position is better: that's where you now are. Keep it off. Ring.