Should You Worry? Petrol in a Diesel Car in Throckley
Not started? Then less anxious than you probably feel. Everyone around Throckley starts with "have I wrecked it?", and the fair answer is normally no: petrol resting inside the tank of a diesel remains harmless till priming, cranking or driving draws it into the system. Leave the motor off and ring Petrol in Diesel — that keeps it like that. Below, you will find what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you again.
Your engine and petrol in a diesel: what happens
Passing through an engine, diesel does two jobs at once. Before it ignites, it lubricates — and then it ignites. What stops the surfaces inside the high-pressure fuel pump and your injectors from grinding against each other is your diesel flowing through them — they're built to extremely fine tolerances.
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 precisely the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips out the lubrication the fuel system hinges on, and any pump working on such a mixture is wearing itself.
Taken together, they make clear the shape the trouble takes. It is movement that does the harm, not contact. A tank with petrol in it is a fuel problem. The start of a mechanical problem is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with your fuel to the injectors downstream.
Four scenarios our technicians see in Throckley: how bad is petrol in a diesel?
Filled but not once started — the best it gets. Only the tank has petrol in it, so the job is emptying the tank and flushing the system where your car sits. This scenario can only really occur on a forecourt: anywhere else, the vehicle got there by being driven.
Your ignition switched on, or a short start. The fuel system has been primed, and so petrol has left that tank and got to the fuel filter and the fuel lines. Drain, flush, deal with the filter: still usually simple.
Those few miles on the road meant the pump running on fuel thinned by petrol throughout. Miles is only half of it; how hard it was driven matters equally. Either way the work includes that tank, your lines, your filter and clean fuel through the entire circuit. On the school run to Throckley Primary School, the miles is short. Very different again: a trip to Newcastle upon Tyne, under 10 miles away, or any miles on the Central Motorway East, under 10 miles from Throckley, where your engine kept working hard.
Driven on until it complained — clattering, smoke, a ragged idle, a soft throttle. The fuel is not behaving like diesel any more, and the engine is telling you. Pull up wherever you are — the verge on Back Victoria Terrace, a lay-by, a side street — and leave it where it is. Long-term damage is very uncommon if a car is stopped quickly, and the drain and flush-through that still come first take care of it.
Throckley people and that petrol in a diesel myths they hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. A bigger tank of the same mixture is all it gives, since topping up takes out nothing. That guidance supposes a diesel fuel system tolerates petrol by percentage. It does not.
"Newer diesels can handle a little petrol" — a myth, and closer to the reverse. Lubrication counts more on newer diesels, not less, since their fuel runs through more precise parts at higher pressure.
"It starts, it drives, so no harm done" — the myth that trips up most drivers than any other. Any petrol motor fed diesel usually won't run, so the motorist stops and the damage stops with them. A diesel fed petrol normally starts, idles and drives away as if nothing has happened, whilst the pump wears. Being able to run is not proof of being fine.
An old workaround for a distinct problem is behind this one. Myth: "Add some two-stroke oil and drive the car home." What petrol has thinned stays weakened, and that petrol stays inside the tank regardless.
Myth: "Drain your tank yourself and you are sorted." After the engine has been run, some of the petrol is no longer in the tank: it is in your filter and the lines, and it goes straight back through the pump on your next start. Emptying petrol into a can by the roadside is also genuinely hazardous.
Petrol in a diesel: how does it take place?
No one does it on purpose, and it is seldom carelessness. A diesel nozzle generally will not fit a petrol car, but the slimmer petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error straightforward, and only in that direction.
The moment routine stops matching the car is the moment it happens. Hire cars, courtesy cars, and cars that are new to you. Households running one of each, petrol and diesel. A familiar forecourt with the pumps in a different order. A train to catch, and a rushed fill en route to Blaydon. Years of petrol motors behind you, a diesel Volkswagen Passat in front of you on the forecourt for its first tank — that is when. With rain, a call arriving, or children to deal with, your hand just does what it always has.
Preventing petrol in a diesel next time you fill up in Throckley
- Check the pump, not the colour. In the UK unleaded handles are normally green and diesel black, yet not on every forecourt. The label is what counts.
- Plenty of motors state the fuel inside your filler flap or on the cap, and so check it on your first fill in a motor you don't know.
- One of each in the house? Mark your key to your diesel — a bright fob, a sticker — since meaning to remember is not enough.
- "Diesel", aloud, before you pick up the nozzle — every time a new or hired car needs its first tank. It sounds daft. It works.
- While you are thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to block a petrol nozzle, and add-on devices are available for the remainder. Treat it as a safety net, and keep checking the pump.
- Stop the moment you realise. Less petrol inside that tank makes a weaker blend. It doesn't change what to do next, which is still not to fire it up.
Already put petrol in a diesel around Throckley?
The order of things is brief, then. Do not crank it, and do not turn the ignition on. The attendants at the forecourt — whether at Shell itself or wherever you filled up — will usually help roll it away from the petrol pump if you ask. Ring 0333 366 0103 next, with three answers — your fuel, the approximate amount, and if it has run.
Corrosion and deposits form the problem with AdBlue, where petrol means lost protection. So if it was AdBlue, say so — and read its own Throckley page.
Why one petrol in a diesel job in Throckley costs more than another
A fair single price doesn't exist here: four scenarios, four separate jobs. What shifts the cost is chiefly which of them you're in. After that it is the ratio — how much petrol was put in against how much your tank holds — and then where the car is and whether our van can get to it safely.
Three queries come first, before any quote, instead of after — what went in, how much, has it run — and this is the reason. A range becomes a straight figure once those answers are in.
About Throckley and its setting
Throckley is a village in Tyne and Wear, situated on the banks of the River Tyne at an elevation of 77 metres. Throckley lies approximately 5.8 miles west of Newcastle upon Tyne, near the settlements of Bank Top, Walbottle, and Newburn. Throckley has a population of around 3189 residents, with semi-detached housing being the predominant type in the area. Throckley is located about 250.2 miles north of London, in the North East region of England.
Across Tyne and Wear and around Throckley: fuel drain cover
Bank Top, Walbottle and Newburn are among the places near Throckley that the same vans work, answering petrol in diesel call-outs across Throckley's NE postcode area. A forecourt, a supermarket car park, a lay-by or your own drive are all places our technicians drain, and your car doesn't need to move to us.
In Throckley and still at the pump?
Then you are in the best place there is. Leave it turned off, then ring.