Nuttall: Petrol in a Diesel Car? How Worried to Be
Provided it hasn't been started, worry less than you likely are. Till your ignition primes the pump, the starter turns, or the car is driven, petrol in a diesel tank just sits there and does nothing. Which means the honest reply to that first Nuttall question — "have I ruined it?" — normally no. To keep the vehicle like that, call Petrol in Diesel then leave your engine switched off. What petrol really does to a diesel, how to judge how far it's gone, and how to keep it from happening again: that is the rest of this page.
What petrol in a diesel does to your engine
Passing through a motor, diesel does two things at the same time. It combusts, and before it ignites it lubricates. What keeps the surfaces inside the high-pressure fuel pump and the fuel injectors from grinding against one another is your diesel flowing through them — they're built to very fine gaps.
Badly at the first, not at all at the second: that's petrol. The rattling comes from petrol being designed not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips away the lubrication the fuel system depends on, and any pump working on such a mix is wearing itself.
Taken together, they make clear what shape the trouble has. The harm is done by movement, not by contact. Where the petrol is only inside your tank, it's a fault of fuel, nothing more. After your pump has been labouring on that petrol, a mechanical fault has started: anything shed by a pump that is wearing travels onward to your injectors with the fuel.
Petrol in a diesel in Nuttall: how serious is it? Four situations
Fuelled up, never started. The best case there can be. Being at a forecourt is what makes this the case: elsewhere, the car has been driven there to begin with. With the petrol kept in that tank alone, it is emptied and purged on the spot, and nothing more is needed.
Started for a moment, or only your ignition on. Petrol has left your tank and reached the fuel filter and the lines, since your system has been primed. Still generally easy: drain, flush, and the filter dealt with.
The pump now spent a few miles on thinned fuel — that's what driving the car does. Miles is only half of that; how hard it was driven counts equally. Either way the work includes the tank, your lines, the fuel filter and clean fuel through the whole circuit. Short trips, such as the school run to Hazlehurst Primary Academy, are one matter. Getting as far as Salford, under 15 miles away, makes a very different task — as does any mileage on the M66, under a mile from Nuttall, with the motor working hard all the way.
It complained, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone uneven. The engine is telling you the fuel is no longer behaving like diesel. Leave it where it has stopped: a lay-by, a side street, the verge on Astley Hall Drive. The fuel drain and flush-through still go first, and they sort it out: when a vehicle is stopped soon, lasting damage is very uncommon.
Nuttall drivers and that 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. Nothing is removed by topping up — you are left with a fuller tank, still the same mix. The idea behind that guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
Not so: a current diesel copes with a bit of petrol. Rather, the reverse. Protection matters more on current diesels, not less, because their fuel passes through finer parts at higher pressure.
"It starts, it drives, so no harm done" — the myth that trips up more motorists than any other. Diesel in a petrol motor generally means a motor that won't run: the motorist stops, and so does the damage. Feed petrol to a diesel and it normally starts, ticks over and pulls away like nothing happened — all the while its pump wears. Running is not the same as fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It's an outdated fix for a different fault. What petrol has diluted remains diluted, and the petrol stays in the tank anyway.
The next start sends petrol back round the pump out of your lines and the filter, where some of that ends up once the engine has run. That is why draining your tank yourself does not sort it — a myth. On top of that, petrol drained into a can by the road is truly hazardous.
How petrol ends up: petrol in a diesel
Carelessness is rarely the cause, and nobody means to do it. A diesel nozzle mostly won't go into 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 one direction.
It takes place when habit and your car stop matching. Courtesy car, hire car, or a vehicle that's brand new. Households running one of each, petrol and diesel. A well-known forecourt with the pumps in a different order. Fuelling up in a hurry en route to Bromley Cross, with a train to catch. Years of petrol vehicles behind you, a diesel BMW 3 Series in front of you at the forecourt for its first tank — that is when. Throw in rain, a phone call or a back seat full of kids, and the hand repeats what it has always done.
How to avoid petrol in a diesel at your next fill-up in Nuttall
- A green handle for unleaded and black for diesel is normal in the UK — yet not on every forecourt. Go by the label on the petrol pump, not the colour.
- Inspect your filler flap. Many vehicles state the fuel inside the flap or on the cap. Look at it on your first fill in any vehicle you do not know.
- One of each in the house? Label your key to the diesel — a bright fob, a sticker — because intending to remember is not enough.
- Before the nozzle leaves the pump the first time you fuel a hired or new vehicle, say "diesel" out loud. Silly, perhaps, but it does the trick.
- 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.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to reject a petrol nozzle, and add-on devices are available for motors without one. They are a safety net, not a reason to stop checking the petrol pump.
- Spotting it halfway? Stop there and then. A weaker mix results from less petrol in the tank, but your next stage stays the same: don't start the car.
Nuttall: already put petrol in a diesel?
The order of things is short, then. Leave it unstarted, with your ignition switched off too. The attendants on the forecourt — whether at EG On the Move itself or wherever you filled up — will normally help roll it clear of the pump if you ask. What was put in, roughly how much, and if it has run: tell us that when you ring 0333 366 0103.
Say so if it was AdBlue instead of petrol: it is a separate issue, with its own page for Nuttall, because AdBlue brings corrosion and deposits rather than lost lubrication.
Why one petrol in a diesel task in Nuttall costs more than another
Four different jobs lie behind the four scenarios above — which is why there's no fair single quote. Mostly, the cost shifts with which one you are in. Where your car is matters too, and whether a van can safely reach it, after the ratio of petrol to what your tank takes.
That is why our technicians ask three questions before pricing rather than after: what went in, how much, and whether it's run. With those replies, you get a straight figure rather than a range.
About Nuttall, for a moment
Nuttall is a suburban area in Greater Manchester, situated near the riverside and surrounded by nearby places such as Tagg Wood and Hazelhurst. Nuttall has a population of approximately 4698 residents and is characterised by predominantly detached housing. Nuttall is located about 10.9 miles from Salford and 173.6 miles from London, sitting at an elevation of around 152 metres. Nuttall forms part of the wider residential area that includes Brooksbottoms.
Fuel drain cover in Nuttall and across Greater Manchester
Our vans answering petrol in diesel calls around Nuttall, in the BL postcode area, equally work the locations around it, Tagg Wood, Hazelhurst and Brooksbottoms among them. A forecourt, a supermarket car park, a lay-by or your own drive are all spots we drain, and your car does not need to come to us.
In Nuttall and still at the petrol pump?
Then you are in the best position there can be. Keep it turned off, then ring.