Petrol in a Diesel Car in Shay Gate: How Worried Should You Be?
Far less than you likely are, provided it has not been started. Petrol resting in a diesel tank does nothing to the motor until something pulls it through the system — your ignition priming the pump, the starter, or driving itself. So the truthful answer to the first question everyone around Shay Gate asks, "have I ruined it?", is normally no. Keep it like that: leave your motor off and phone Petrol in Diesel. Further down, this page sets out what petrol actually does inside a diesel, how far it may have got, and how to stop it happening to you a second time.
The engine and petrol in a diesel: what goes on
On its way through a motor, diesel does two tasks. Before it ignites, it lubricates — and then it combusts. Made to very fine clearances, the fuel injectors and your pump depend on the diesel flowing through them to stop their surfaces wearing against one another.
The second task petrol does not do at all, and the first it does poorly. A pump working on a petrol blend is wearing itself out, because petrol is runnier than diesel and strips out the lubrication the 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's where any knocking comes.
Put those together and the shape of the problem is plain. Contact doesn't do the harm — circulation does. Where that petrol is only inside that tank, it is a fault of fuel, nothing more. The start of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds moves on with your fuel to the fuel injectors beyond it.
Petrol in a diesel around Shay Gate: how bad is it? Four situations
Fuelled up, not once started. The best case there can be. Just your tank has petrol in it, so the task is emptying that tank and rinsing your system where the vehicle sits. This scenario can only truly take place at a forecourt: anywhere else, the vehicle got there by being driven.
Your ignition switched on, or a brief start. Once primed, your system has drawn petrol from that tank as far as the filter and the lines. Drain, flush, deal with your filter: still usually straightforward.
Driven a couple of miles. Now the pump has spent those miles working on thinned fuel. How hard the vehicle was driven matters as much as how far, and the work takes in the tank, the lines, the filter and clean fuel through the whole system. A school run to Sandy Lane Primary School is one matter. Getting as far as Bradford, under 5 miles away, makes a very different task — as does any mileage on the M606, under 5 miles from Shay Gate, with your engine labouring hard the whole time.
It protested, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone lumpy. The fuel is not acting like diesel any more, and the engine is telling you. Stop wherever you are — the verge on Prune Park Lane, a lay-by, a side street — and leave it there. Long-term damage is very unusual if a vehicle is stopped quickly, and the fuel drain and flush that still go first deal with it.
Myths Shay Gate people hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Nothing comes out when you top up — the tank just holds more of the same blend. The idea behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: a current diesel copes with a bit of petrol. If anything, the opposite. A newer diesel sends its fuel through more precise parts at higher pressure, which makes the lubrication count more, not less.
The myth that catches people off guard: if it starts and drives, it must be unharmed. A petrol motor fed diesel generally will not run, and so the motorist stops and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump grinds. A running engine does not mean fine.
Myth: "Add some two-stroke oil and drive it home." It's an old workaround for a different fault. What petrol has weakened stays diluted, and the petrol remains in the tank anyway.
Once your engine has been run, part of the petrol is in your filter and the fuel lines, not the tank — and the next start pulls it right back through the pump. So the myth "drain that tank yourself and you're sorted" does not hold. It is also really risky to drain petrol into a can by the kerbside.
Petrol in a diesel: how does it happen?
A careless moment is rarely the cause, and no one means to do it. One way only, since of the nozzles: the narrower petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol car. That's how the forecourt makes it simple.
It happens when habit and the car stop matching. Hire cars, courtesy cars, and cars that are new to you. Households running one of each, petrol and diesel. The pumps in a different order on a familiar forecourt. A hurried fill on the way to Bingley with a train to catch. Years of petrol vehicles behind you, a diesel Renault Clio in front of you at the forecourt for its first tank — that's when. With rain, a call coming in, or a car full of children to deal with, the hand just does what it always has.
Next time you fill up in Shay Gate: avoiding petrol in a diesel
- The label is what counts, so check the petrol pump rather than the colour: in the UK unleaded handles are usually green and diesel black, but not on each forecourt.
- Inspect the filler flap. Many vehicles state the fuel type inside the flap or on the cap. Look at it on your first fill in a car you do not know.
- Good intentions do less than a sticker or a fob in a bright colour on the diesel's key when a home has one of each. So label it.
- Before the nozzle leaves the petrol pump the first time you fill a hired or new motor, say "diesel" aloud. Daft, perhaps, but it does the trick.
- While you're thinking about something else, this is an easy mistake to make — so put the phone away.
- Some diesels come with a filler designed to refuse a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop checking the pump.
- Less petrol makes a thinner mix, so stop as soon as you realise — though remembering that your next step is unchanged. It's still not to crank it.
Already put petrol in a diesel around Shay Gate?
Then the order of things is brief. Leave it unstarted, with the ignition off as well. Yet on the forecourt, at Shell or anywhere else? Ask the attendants to help you roll the car away from the pump. Then phone 0333 366 0103 and tell us what went in, roughly how much, and if it has run.
Corrosion and deposits are the problem with AdBlue, where petrol brings lost lubrication. So if it was AdBlue, say so — and see its own Shay Gate page.
Shay Gate petrol in a diesel tasks: why one costs more than another
There is no honest single price for this, because the four situations above are four separate tasks. What moves your cost is mostly which of them you are in. The share matters next, meaning how much of your tank is petrol, followed by the position of the car and whether getting to it is safe for a technician.
Before any quote, not after, we ask three queries: the fuel that got in, the amount, and whether it has run. That's why. Those answers change a range into a straight figure.
About Shay Gate itself
Shay Gate is a locality in West Yorkshire, situated near the river and close to the cities of Bradford and Leeds. Shay Gate sits at an elevation of 267 metres, with semi-detached housing being the predominant type of accommodation in the area. Shay Gate is located near several other small places, including Sandy Lane, Stony Lane, and Lingbob, and is approximately 4 miles from Bradford. Shay Gate has a population of around 532 people, making it a small but distinct community in the region.
Fuel drain cover across West Yorkshire, Shay Gate included
Sandy Lane, Stony Lane and Lingbob are among the places near Shay Gate that the same vans work, answering petrol in diesel jobs across Shay Gate's BD postcode area. We drain where your vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the petrol pump in Shay Gate?
Nothing beats it: that is where you now are. Leave the car turned off, and ring.