Should You Worry? Petrol in a Diesel Car in Baffins
Provided it hasn't been started, worry less than you probably are. Till the ignition primes your pump, your starter turns, or the car is driven, petrol in a diesel tank just waits there and does nothing. Which means the truthful reply to that first Baffins question — "have I ruined it?" — usually no. To leave the car that way, call Petrol in Diesel then leave the motor switched off. Below, this page sets out what petrol actually does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
What petrol in a diesel does to your engine
On its way through an engine, diesel has two tasks. Oiling comes before burning; it does both. Very fine clearances are built into your injectors and the high-pressure pump, and just your diesel flowing through keeps those surfaces from grinding together.
The second job petrol doesn't do at all, and the first it does poorly. Being less viscous than diesel, petrol strips away the lubrication a fuel system needs, so a pump on the mixture wearing itself. It's also made to resist igniting under compression — the opposite of what a diesel needs — which is why you get the rattling.
Put these together and the shape of the issue is plain. The harm is done by circulation, not by contact. Petrol in the tank is a fuel problem. The beginning of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds moves on with your fuel to your injectors beyond it.
Petrol in a diesel in Baffins: how bad is it? Four situations
Fuelled, and not started: no case is better. Being at a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With the petrol kept inside your tank alone, it is emptied and cleaned on the spot, and nothing more is needed.
Ignition on, or started for a second. With the fuel system primed, the lines and filter already contain petrol that has come from that tank. Drain, flush, deal with your filter: still usually straightforward.
Driven a few miles. Now your pump has spent these miles running on diluted fuel. How hard the car was driven matters as much as how far, and this work takes in that tank, the lines, your filter and clean fuel through the whole system. Driving the children to Westover Primary School is one sort of trip. Any distance on the M275, under 3 miles from Baffins, means the motor working hard throughout, and a run to Portsmouth, under 3 miles away, makes a very different job as well.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone lumpy. The engine is telling you your fuel is no longer behaving like diesel. Pull up wherever you are — the verge on Cooper Road, a lay-by, a side street — and leave the car where it is. A car stopped soon very seldom has lasting damage, because the drain and the flush-through, which still come first, deal with it.
Petrol in a diesel stories Baffins people hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." A bigger tank of the same mixture is all it gives, since topping up takes out nothing. The idea behind the advice — that diesel fuel systems accept petrol by percentage — is wrong.
"Current diesels can handle a little petrol" — a myth, and closer to the reverse. A modern diesel runs its fuel through finer components at higher pressure, which makes the lubrication count more, not less.
"It starts, it drives, so there is no harm" — the myth that trips up most drivers than any other. Any petrol motor fed diesel normally won't run, and so the motorist stops and the damage stops with them. A diesel fed petrol usually starts, idles and drives away as if nothing has happened, while your pump grinds. Running isn't the same as fine.
Myth: a two-stroke additive makes it safe to drive home. It was an old workaround, supposed for another fault. What petrol has diluted remains weakened, and that petrol remains inside the tank anyway.
Myth: "Drain the tank yourself and you are sorted." After the engine has been run, some of that petrol is no longer inside the tank: it is in the filter and your lines, and it goes right back through your pump on the next start. Clearing petrol into a can at the roadside is also genuinely hazardous.
How does petrol in a diesel take place?
It is rarely carelessness, and no one does it on purpose. One way only, because of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol motor. That is how the forecourt makes it easy.
The moment routine stops matching the car is the moment it takes place. Any motor that is new to you — a hire car, on loan as a courtesy car, or just bought. Households running one of each, petrol and diesel. A forecourt you know, but with its pumps arranged differently. A rushed fill on the way to Fratton with a train to catch. A new-to-you diesel Volkswagen Passat, its first fuelling, and a driver used to petrol: exactly when it occurs. With rain, a call arriving, or children to deal with, the hand simply does what it has always done.
Avoiding petrol in a diesel next time you fill up around Baffins
- 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 just a hint.
- Inspect the filler flap. Plenty of vehicles state the fuel inside the flap or on the cap. Look at it on the first fill in any car you don't know.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of intending to remember, in a home with one of each.
- It sounds silly and it does the trick: on your first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump.
- While you are thinking about something else, this is an easy mistake to make — so put the phone away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to refuse a petrol nozzle, and add-on devices are available for vehicles without one. They are a safety net, not a reason to stop reading the petrol pump.
- Less petrol makes a weaker mixture, so stop the moment you realise — though remembering that the next step is unchanged. It's still not to fire it up.
Put petrol in a diesel in Baffins already?
The order of things is brief, then. Don't fire it up, and don't switch your ignition on. Still on the forecourt, at BP or anywhere else? Ask the staff to help you push the car clear of the petrol pump. Phone 0333 366 0103 next, with three answers — your fuel, the approximate amount, and whether it's run.
Corrosion and deposits are the trouble with AdBlue, where petrol brings lost lubrication. So if it was AdBlue, say so — and read its own Baffins page.
One petrol in a diesel job in Baffins costs more than another. Why?
There is no fair single price for this, since the four situations above are four separate jobs. Chiefly, the cost shifts with which one you're in. Two things follow that: the petrol that was put in as a share of what the tank holds, then the place the car is in and whether a van can reach it safely.
Three questions come first, before quoting, rather than after — what went in, how much, has it run — and that is the reason. With the replies, you get a straight figure rather than a range.
About Baffins itself
Baffins is a coastal suburban area in Hampshire, situated near the city of Portsmouth and close to the neighbouring areas of Copnor, Buckland, and Kingston. Baffins is characterized by its low elevation of around 3 metres above sea level and its predominantly terraced housing stock. Baffins is home to a population of approximately 6653 residents and is located about 1.9 miles from Portsmouth city centre. Baffins forms part of the larger Portsmouth urban area, which is about 62.7 miles south-west of London.
Fuel drain cover across Hampshire, Baffins included
Copnor, Buckland and Kingston are among the places around Baffins that the same vans work, answering petrol in diesel jobs across Baffins's PO postcode area. No need to move the car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places we drain.
At the petrol pump around Baffins, right now?
Then you're in the best position there can be. Keep the vehicle switched off, then ring.