Ringley: Petrol in a Diesel Car? How Worried to Be
Probably less than you are now — provided nobody has started it. Petrol resting in a diesel tank does nothing to your engine until something draws it through the system — the ignition priming your pump, your starter, or driving itself. So the fair answer to the first query everyone in Ringley asks, "have I ruined it?", is generally no. Leave your motor off and ring Petrol in Diesel — that is how you keep it like that. Below, you will find what petrol actually does inside a diesel, how far it may have got, and how to stop it happening to you again.
Petrol in a diesel: what does it do to your engine?
Two jobs fall to diesel on its route round a motor. Before it burns, it lubricates — then it combusts. The high-pressure pump and your injectors are made to very fine clearances, and your diesel passing through them is what stops those surfaces from grinding against one another.
The second task petrol does not do at all, and the first it does poorly. The knocking comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips away the lubrication your system rests on, and any pump working on that mix is wearing itself.
Seen together, they make clear the shape the problem takes. The damage is done by movement, not by contact. Where the petrol is only in your tank, it is a problem of fuel, nothing more. Whatever a worn pump sheds travels on, carried by the fuel, into the fuel injectors further along, which is why a pump that has been working on that petrol is where a mechanical issue starts.
Ringley, petrol in a diesel: four situations, from mild to significant
Fuelled up, not once started. The best case there can be. Just your tank has petrol in it, so the job is draining your tank and flushing the fuel system where your car stands. This scenario can only really occur on a forecourt: anywhere else, the vehicle got there by being driven.
A brief spell of running, or just your ignition on. With the system primed, your lines and filter already hold petrol that came from your tank. Drain, flush, deal with the filter: still usually simple.
A couple of miles driven, and your pump has spent every one of them running on thinned fuel. The work is the tank, your lines, the filter and fresh fuel through the whole circuit, and how hard the car was driven matters as much as how far. Driving the kids to St Saviour CofE Primary School, Ringley is one kind of trip. Getting as far as Salford, under 10 miles away, makes a very different job — as does any miles on the Kearsley Spur, under 3 miles from Ringley, with the engine working hard the whole time.
Clattering, a lumpy idle, smoke, a throttle gone soft: driven till it complained. The motor is telling you the fuel is no longer behaving like diesel. Leave it wherever it stops: a lay-by, a side street, the verge on Ringley Road. What comes first is still the fuel drain and flush, and that sorts it out, with lasting damage very unusual when a vehicle is stopped early.
Ringley people and the petrol in a diesel stories they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Topping up removes nothing; it gives you a bigger tank of the same mix. That advice assumes a diesel fuel system tolerates petrol by percentage. It does not.
If anything, the reverse holds. Myth: "A newer diesel can cope with a bit of petrol." More precise parts and higher pressure are the way a newer diesel runs its fuel, and that makes the lubrication count more, not less.
One myth that catches motorists off guard: if it starts and drives, it must be unharmed. Any petrol motor fed diesel generally won't run, so the motorist stops and the harm stops with them. Feed petrol to a diesel and it usually starts, idles and drives away as if nothing happened — all the while its pump wears. Fine and running aren't the same thing.
An outdated fix for a distinct problem is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." The petrol is still in that tank afterwards, and whatever it has diluted is not put back.
If the motor has run, part of the petrol sits in the fuel filter and the fuel lines, not your tank — and your next start sends it straight back through your pump. So the myth "drain the tank yourself and you are sorted" doesn't hold. Besides, petrol drained into a can by the road is truly dangerous.
How petrol ends up: petrol in a diesel
Carelessness is seldom the cause, and nobody means to do it. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle mostly won't go into a petrol motor at all. So the error runs one way.
Routine and the vehicle getting out of step is when it occurs. Courtesy car, hire car, or a car that's new. One petrol and one diesel on the drive of the same household. A well-known forecourt with the pumps in a different order. Rushing for a train at Kearsley and filling up en route. The first fill-up in a diesel Renault Clio after years of driving petrol is precisely the moment it takes place. Your hand does what it has always done when you add rain, a phone call or a back seat full of kids.
Next time you fill up around Ringley: avoiding petrol in a diesel
- Green for unleaded and black for diesel is normal in the UK — yet not on every forecourt. Go by the label on the pump, not the colour.
- The first fill in a new vehicle is the time to check the filler flap — inside it, or on the cap, many cars state the fuel they take.
- Mark the key. In a home with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- Before the nozzle leaves the petrol pump the first time you fuel a hired or new motor, say "diesel" aloud. Daft, perhaps, yet it does the trick.
- While you are thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Add-on devices exist for motors without one, and some diesels come with a filler that will not take a petrol nozzle. Helpful — but a safety net only, never a reason to stop checking the label.
- Stop as soon as you realise. Less petrol in your tank means a thinner mix. It does not change what to do next, which is still not to fire it up.
Put petrol in a diesel around Ringley already?
The order of things is short, then. Starting it is out, and so is switching on the ignition. Still at the forecourt, at Shell or anywhere else? Ask the attendants to help you push it away from the pump. Phone 0333 366 0103 next, with three facts — the fuel, the approximate quantity, and whether it's run.
If it was AdBlue instead of petrol, say so. That's a separate fault — corrosion and deposits and not lost lubrication — and it has its own page for Ringley.
Ringley petrol in a diesel jobs: why one costs more than another
Four separate jobs lie behind the four scenarios above — which is why there's no fair single price. The scenario itself does most of the work of moving your cost. Next it's the proportion — how much petrol went in against how much your tank holds — and then where the vehicle is and whether a technician can get to it safely.
That is why our technicians ask three questions before pricing rather than after: what got in, how much, and if it's run. The answers change a range into a straight figure.
About Ringley and where it is
Ringley is a suburban area in Greater Manchester, situated on the riverside at an elevation of 56 metres, with semi-detached housing being the predominant type of accommodation. Ringley lies approximately 5 miles from Salford and is close to nearby places such as Stoneclough, Ringley Fold, and Prestolee. Ringley has a population of around 2781 residents and is located in the North West region of England, about 169 miles from London.
Fuel drain cover around Ringley and across Greater Manchester
Ringley waits in the M postcode area, and our vans that answer petrol in diesel jobs there work the locations near it as well — Stoneclough, Ringley Fold and Prestolee among them. Our technicians drain wherever the vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the pump in Ringley?
Nothing beats it: that's where you now are. Turned off it stays; then call.