Petrol in a Diesel Car in New Springs: How Worried Should You Be?
Less than you likely are, if it has not been started. Petrol resting in a diesel tank does nothing to the motor until something pulls it through the fuel system — your ignition priming your pump, your starter, or the drive itself. So the honest answer to the first query everyone around New Springs asks, "have I wrecked it?", is normally no. Leave your motor off then ring Petrol in Diesel — that keeps it like that. 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.
What petrol in a diesel does to the motor
Diesel has two jobs on its way through an engine. It combusts, and before it combusts it lubricates. Designed to very fine tolerances, your injectors and your pump rely on the diesel flowing through them to stop their surfaces wearing against one another.
Of those two jobs, petrol handles the first poorly and the second not at all. The knocking comes from petrol being designed not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips away the protection your system depends on, and any pump running on such a mixture is wearing itself.
Taken together, they make clear what shape the issue takes. Not contact but circulation is what does the harm. Any tank with petrol in it is a fuel issue. The start of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds travels on with your fuel to the fuel injectors beyond it.
How bad is petrol in a diesel? Four situations our engineers see in New Springs
Fuelled, and never started: no case is better. Being on a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With the petrol held in that tank alone, it's drained and flushed right where it stands, and nothing more is needed.
The ignition switched on, or a brief start. Once primed, the system has drawn petrol out of the tank up to your filter and the fuel lines. That's normally still a simple task — a drain, a flush, and the filter seen to.
Some miles driven, and the pump has spent every one of them running on thinned fuel. Distance is only half of it; how hard it was driven counts just as much. Either way this work runs to that tank, the lines, your filter and fresh fuel through the whole system. Driving the children to Holy Family RC Primary School, New Springs, Wigan is one kind of trip. Getting as far as Salford, under 15 miles away, makes a very different job — as does any miles on the M61, under 3 miles from New Springs, with the engine labouring hard the whole time.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone ragged. What you are hearing is your motor signalling fuel that no longer runs like diesel. Leave it where it has stopped: a lay-by, a quiet street, the verge on Kirkless Street. A car pulled over quickly very rarely has permanent damage, because the drain and the flush-through, which still come first, take care of it.
Petrol in a diesel myths New Springs drivers hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Nothing is removed by topping up — you're left with a fuller tank, still the same mix. Percentage isn't how a diesel fuel system copes with petrol, whatever that guidance presumes.
"Current diesels can handle a little petrol" — a myth, and closer to the opposite. A newer diesel runs its fuel through smaller parts at higher pressure, which makes the lubrication matter more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that fools people. Feed diesel to a petrol motor and it normally will not run, so the driver stops — and the damage stops with them. Feed petrol to a diesel and it normally fires up, ticks over and drives away like nothing has happened — all while its pump wears. Running does not mean fine.
An outdated workaround for a different fault lies behind this one. Myth: "Add some two-stroke oil and drive the car home." What petrol has thinned stays weakened, and the petrol stays in your tank regardless.
The next start sends petrol back round the pump out of the lines and the filter, where some of it sits once the engine has run. That's why draining your tank yourself does not leave you sorted — a myth. And, a can of petrol drained by the roadside is truly dangerous.
Why petrol in a diesel happens at all
It is seldom carelessness, and no one does it on purpose. The forecourt makes it simple: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle mostly will not go into a petrol car at all. So the mistake runs one way.
When habit and the car stop matching, it occurs. Courtesy car, hire car, or a vehicle that is brand new. Two vehicles on one drive, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A train to catch, and a rushed fill on the way to Ince. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it occurs. With rain, a call arriving, or children to deal with, your hand simply does what it has always done.
New Springs motorists: how to avoid petrol in a diesel next time
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most usually do. Read the petrol pump's label; the colour is only a hint.
- Check your filler flap. Many cars state the fuel inside the flap or on the cap. Look at it on the first fill in a car you don't know.
- Good intentions do less than a sticker or a fob in a vivid colour on your diesel's key if a household has one of each. So label it.
- It sounds silly and it works: on your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, so put the phone away then keep your mind on the petrol pump.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to reject a petrol nozzle, and add-on devices exist for vehicles without one. They are a backstop, not a reason to stop reading the pump.
- Less petrol means a weaker blend, so stop the moment you realise — while remembering that the next stage is unchanged. It is still not to fire it up.
Put petrol in a diesel in New Springs already?
In that case, there's only a short order of things. Starting it is out, and so is turning on the ignition. Ask the attendants to help you roll it clear of the petrol pump if you're still on the forecourt, whether that's BP or anywhere else. What went in, roughly how much, and whether it's run: tell us that when you phone 0333 366 0103.
Say so if it was AdBlue instead of petrol: it is a different problem, with its own page for New Springs, because AdBlue brings corrosion and deposits instead of lost protection.
One petrol in a diesel task in New Springs costs more than another. Why?
Four separate jobs sit behind the four situations above — which is why there is no fair single quote. Mostly, the cost moves with which situation you are in. Beyond that it's the share — how much petrol was put in against how much your tank holds — and then where the car is and whether a technician can reach it safely.
That's why our engineers ask three questions before costing rather than after: what was put in, how much, and if it has run. A range turns into a straight figure when the answers are in.
About New Springs, briefly
New Springs is a suburban area in Greater Manchester, situated on the riverside at an elevation of 87 metres. New Springs has a mix of housing types, but semi-detached homes are the most common, and it is located near other local places such as Top Lock and Whelley. New Springs is positioned approximately 13.7 miles from Salford and 175.8 miles from London, making it a commuter-friendly location. New Springs has a population of around 2775 residents.
Across Greater Manchester and around New Springs: fuel drain cover
Top Lock, Whelley and Bottling Wood are among the places around New Springs that the same vans work, answering petrol in diesel jobs across New Springs's WN postcode area. The vehicle 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.
At the petrol pump around New Springs, right now?
In that case, you couldn't be in a better spot. Turned off it stays; then phone.