Petrol in a Diesel Car in Dee Banks: How Worried Should You Be?
Less than you probably are, if it has not been started. Everyone in Dee Banks starts with "have I wrecked it?", and the honest answer is normally no: petrol resting in the tank of any diesel stays harmless till priming, cranking or driving pulls it into your fuel system. Keep it like that: leave the engine off and phone Petrol in Diesel. Keep reading for three things: the effect petrol has inside a diesel engine, the signs of how far it has spread, and the way to make sure you don't do it again.
What petrol in a diesel does to the motor
Passing through a motor, diesel is doing two things at the same time. Oiling comes before burning; it does both. Extremely fine tolerances are built into the fuel injectors and your high-pressure pump, and just your diesel running through stops their surfaces grinding together.
Of those two jobs, petrol manages the first badly and the second not at all. It's thinner than diesel and removes the lubrication the system hinges on, so a pump running on a petrol mixture is a pump wearing itself. And petrol is made to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That is where the rattling comes from.
The shape of the issue is clear once you put those together. The damage is done by movement, not by contact. Where the petrol is only inside your tank, it is a fault of fuel, nothing more. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with the fuel to your injectors further on.
Four scenarios we see in Dee Banks: how serious is petrol in a diesel?
Fuelled up, not once started. The best case there can be. Being on a forecourt is what makes this the case: elsewhere, your car has been driven there to begin with. With that petrol kept inside your tank alone, it is cleared and purged on the spot, and nothing more is needed.
The ignition switched on, or a short start. The fuel system has been bled, and so petrol has left your tank and reached the fuel filter and the lines. Drain, flush, see to the fuel filter: still usually simple.
Driven a few miles. Now your pump has spent those miles working on thinned fuel. How hard your car was driven matters as much as how far, and the work covers that tank, your lines, the filter and clean fuel through the entire system. Short trips, such as the school run to Boughton Heath Academy, are one thing. A run as far as Chester, under 3 miles away, is a very different job. So is any distance on the M53, under 3 miles from Dee Banks, where your engine has been running hard throughout.
Clattering, an uneven idle, smoke, a throttle gone soft: driven till it complained. What you are hearing is the engine signalling fuel that no longer acts like diesel. Pull up where you are — on the verge on Sandy Lane, at the kerb, down a side road — and don't move it. What goes first is still the drain and flush-through, and that takes care of it, with lasting damage very rare if a vehicle is pulled over early.
Myths Dee Banks people hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. A bigger tank of the same mixture is all it gives, since topping up removes nothing. Percentage is not how a diesel fuel system tolerates petrol, whatever that advice assumes.
"Modern diesels can handle a little petrol" — a myth, and nearer the reverse. A modern diesel runs its fuel through smaller components at higher pressure, which makes the lubrication count more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that fools people. The motorist of a petrol motor fed diesel usually has no choice but to stop, since it will not run, and the damage stops there. While the pump grinds, a diesel fed petrol usually starts, idles and drives away as if nothing has happened. Being able to run is not the same as being fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It's an old fix for a distinct problem. None of what petrol thinned gets put back by it — and later, that tank still contains the petrol.
Myth: "Drain that tank yourself and you're sorted." Once your engine has been run, some of that petrol is no longer inside that tank: it's in the filter and the lines, and it goes right back through your pump at the next start. Besides, petrol cleared into a can by the road is genuinely dangerous.
Why petrol in a diesel happens so easily
On purpose? Never. Through carelessness? Rarely, if ever. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol car at all. The forecourt makes it simple, and the mistake runs one way.
Routine and the car getting out of step is when it occurs. A new motor, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. Your ordinary forecourt, its pumps now in a different order. A train to catch, and a hurried fill en route to Chester. Exactly the moment it happens: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
Next time you fill up in Dee Banks: avoiding petrol in a diesel
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most usually do. Check the petrol pump's label; the colour is only a hint.
- Plenty of motors state the fuel inside your filler flap or on the cap, so check there on the first fill in a vehicle you do not know.
- Good intentions do less than a sticker or a fob in a bright colour on the diesel's key if a household has one of each. So mark it.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It sounds daft and it works.
- Whilst you're thinking about something else, this is an easy mistake to make — so put the phone away.
- Some diesels come with a filler built to refuse a petrol nozzle, and devices you can add exist for cars without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop checking the pump.
- Stop the moment you notice. Less petrol inside that tank makes a thinner mix. It does not change what to do next, which is still not to crank it.
Already put petrol in a diesel in Dee Banks?
In that case, there's only a short order of things. Do not start the car, and do not turn the ignition on. If you're still on the forecourt — Sainsbury's or anywhere else — ask the attendants to help you roll the car away from the petrol pump. What was put in, roughly how much, and whether it's run: tell us those when you call 0333 366 0103.
If it was AdBlue and not petrol, say so. That's a separate issue — corrosion and deposits and not lost protection — and it has its own page for Dee Banks.
Why one petrol in a diesel task in Dee Banks costs more than another
Four separate tasks lie behind the four scenarios above — which is why there is no fair single price. What moves the cost is chiefly which of them you are in. After that it's the ratio — how much petrol was put in against how much that tank takes — and after that where the car is and whether a van can get to it safely.
Three questions come first, before quoting, rather than after — what was put in, how much, has it run — and that is the reason. Those replies turn a range into a straight figure.
About Dee Banks, briefly
Dee Banks is a suburban area located on the outskirts of Chester, situated near the River Dee in Cheshire. Dee Banks sits at a low elevation of around 12 metres, with its riverside setting influencing the local environment. Dee Banks is characterized by its predominantly detached housing stock, reflecting the area's residential nature. Dee Banks is close to nearby places such as Boughton, Boughton Heath, and Huntington, and is just over a mile from Chester city centre.
Fuel drain cover around Dee Banks and across Cheshire
Our vans answering petrol in diesel call-outs around Dee Banks, in the CH postcode area, also work the locations around it, Boughton, Boughton Heath and Huntington among them. The car does not need to come to us: we drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the pump around Dee Banks?
The best position there is, then — that's where you are. Keep it turned off, and ring.