Should You Worry? Petrol in a Diesel Car in Up Green
Provided it has not been started, worry less than you probably are. Petrol resting in a diesel tank does nothing to the engine till something draws it through the fuel system — the ignition priming the pump, the starter, or driving on its own. So the honest answer to the first query everyone around Up Green asks, "have I wrecked it?", is usually no. Petrol in Diesel is who to ring, with your engine left off, and so it remains that way. 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 a second time.
Inside your engine: what petrol in a diesel really does
On its way through an engine, diesel does two tasks. Lubricating comes before burning; it does both. The high-pressure pump and the fuel injectors are built to extremely fine gaps, and the diesel passing through them is what stops those surfaces from wearing against each other.
Badly at the first, not at all at the second: that's petrol. It is runnier than diesel and strips away the lubrication the system rests on, so a pump running on a petrol mixture is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That's where the rattling comes from.
Put these together and the shape of the issue is plain. Contact does not do the damage — movement does. All a tank with petrol in it amounts to is a fuel issue. A pump that has been working on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with the fuel to the fuel injectors further on.
How bad is petrol in a diesel? Four scenarios our technicians see around Up Green
The best case there is: filled up, not once started. On a forecourt, and genuinely only there, that petrol is still limited to the tank — because anywhere else the vehicle was driven to get to it. The job is emptying and flushing on the spot.
Your ignition turned on, or a short start. Once primed, your system has pulled petrol out of that tank as far as the fuel filter and the lines. Drain, flush, see to the fuel filter: still usually simple.
Those few miles driven meant the pump labouring on fuel weakened by petrol the whole way. How hard the car was driven counts as much as how far, and the work takes in that tank, the lines, the fuel filter and fresh fuel through the entire circuit. Short trips, like the school run to Charles Kingsley's Church of England Primary School, are one matter. Any miles on the M3, under 5 miles from Up Green, means the motor working hard throughout, and a run to Winchester, under 50 miles away, is a very different task as well.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone uneven. The motor is telling you your fuel is no longer acting like diesel. Pull up on the spot — on the verge on Coopers Hill, at the kerb, down a side road — and don't move it again. A vehicle stopped quickly very seldom has long-term damage, as the fuel drain and the flush-through, which still go first, sort it out.
Up Green drivers and the petrol in a diesel stories they hear
Myth: topping up to full with diesel makes it fine. It does not. A bigger tank of the same mixture is all it gives, since topping up takes out nothing. A diesel fuel system does not tolerate petrol by percentage in the way that advice supposes.
"Current diesels can handle a little petrol" — a myth, and nearer the reverse. A current diesel runs its fuel through smaller parts at higher pressure, which makes the lubrication matter more, not less.
"It starts, it drives, so no harm done" — the myth that trips up more motorists than any other. The driver of a petrol motor fed diesel usually stops, because it will not run, and the damage stops there. Feed petrol to a diesel and it usually fires up, ticks over and pulls away like nothing happened — all the while its pump wears. A running engine does not mean fine.
Not so: a two-stroke additive lets you to drive home. It was an old workaround, supposed for another issue. It does not put back what petrol has diluted, and that petrol is still in the tank later.
Myth: "Drain the tank yourself and you are sorted." After the engine has been run, some of that petrol is no longer in that tank: it's in the fuel filter and the fuel lines, and it goes right back through the pump at your next start. On top of that, petrol emptied into a can by the road is truly risky.
Why petrol in a diesel occurs so easily
Carelessness is rarely the cause, and no one means to do it. A diesel nozzle generally will not fit a petrol car, yet the narrower 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 vehicle is the moment it happens. Hire cars, courtesy cars, and motors that are new to you. Households running one of each, petrol and diesel. A forecourt you know, but with its pumps arranged differently. Fuelling up in a hurry on the way to Sandhurst, with a train to catch. Years of petrol motors behind you, a diesel Volkswagen Passat in front of you on the forecourt for its first tank — that's when. Add a back seat full of kids, a phone call or rain, and habit wins.
Preventing petrol in a diesel next time you fill up in Up Green
- Check the petrol pump, not the colour. In the UK unleaded handles are generally green and diesel black, but not on every forecourt. The label is what counts.
- Many vehicles state the fuel type inside your filler flap or on the cap, and so check there on the first fill in a vehicle you do not know.
- Label your key. In a home with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump. It sounds daft and it does the trick.
- Mistakes like this are simple to make whilst your mind is on something else, and so your phone goes away.
- 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 motors without one. They are a safety net, not a reason to stop reading the pump.
- Noticing it mid-fill? Stop there and then. A thinner blend follows from less petrol in the tank, yet the next stage remains the same: don't crank it.
Put petrol in a diesel in Up Green already?
Then, there is only a short order of things. Don't switch the ignition on, and don't fire it up. If you're still on the forecourt — Texaco or anywhere else — ask the attendants to help you push the car away from the pump. Next, 0333 366 0103. We will ask what was put in, about how much, and if it's been run.
If it was AdBlue instead of petrol, say so. That's a separate problem — corrosion and deposits instead of lost protection — and it has its own page for Up Green.
Up Green petrol in a diesel jobs: why one costs more than another
There is no honest single price for this, because the four situations above are four different jobs. Mostly, your cost shifts with which situation you are in. Beyond that it is the share — how much petrol got in against how much your tank takes — and then where the car is and whether a 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 that is the reason. Given those answers, you get a straight figure instead of a range.
About Up Green and where it is
Up Green is a small hamlet in Hampshire, situated inland at an elevation of 67 metres, and is located near Eversley Cross and Moulsham Green. Up Green has a population of around 748 people and is characterized by predominantly detached housing. Up Green is positioned approximately 27.5 miles from Winchester and 33.6 miles from London, placing it in a rural setting within the South East region. Up Green remains a quiet residential community with a mix of local amenities and rural surroundings.
Fuel drain cover across Hampshire, Up Green included
Petrol in diesel calls around Up Green — part of the RG postcode area — go to vans that also cover the locations about it, Eversley Cross, Eversley Centre and Moulsham Green included. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations our technicians work, and the car does not need to come to us.
In Up Green and still at the pump?
Nothing beats it: that is where you now are. Call, and keep it switched off.