Petrol in a Diesel Car in Whiteside: How Worried Should You Be?
Less than you probably are, provided it hasn't been started. Petrol resting in a diesel tank does nothing to your engine till something draws it through your fuel system — your ignition priming the pump, the starter, or driving itself. So the truthful answer to the first question anyone around Whiteside asks, "have I ruined it?", is usually no. Keep it that way: leave your engine off and phone Petrol in Diesel. Further down, 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.
Petrol in a diesel: what does it do to your engine?
Passing through a motor, diesel does two jobs at the same time. Before it ignites, it lubricates — and then it burns. Made to very fine clearances, the fuel injectors and your pump depend on your diesel flowing through them to keep their surfaces from wearing against one another.
Badly at the first, not at all at the second: that is petrol. The knocking comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips away the protection the fuel system hinges on, and any pump working on such a mix is wearing itself.
Put those together and the shape of the trouble is clear. The harm is done by circulation, not by contact. Where the petrol is only inside your tank, it is a fault of fuel, nothing more. Whatever a worn pump sheds travels on, borne by your fuel, into the injectors downstream, which is why a pump that has worked on that petrol is where a mechanical fault starts.
Whiteside, petrol in a diesel: four cases, from mild to major
Fuelled but not once started — as good as it gets. That petrol is in the tank and just your tank, and the task is a drain and a flush where your car stands. This is the one scenario that can only truly occur at a forecourt, since anywhere else your car has been driven to get there.
Ignition on, or started for a moment. With the fuel system primed, the lines and filter already hold petrol that has come from the tank. Drain, flush, deal with the fuel filter: still usually simple.
Your pump now spent a few miles on thinned fuel — that is what driving the vehicle meant. How hard the vehicle was driven counts as much as how far, and the work covers your tank, the lines, the fuel filter and clean fuel through the entire circuit. The school run to the local primary school is one matter. Any distance on the M8, under 3 miles from Whiteside, means the engine has worked hard throughout, and a run to Dunfermline, under 15 miles away, is a very different task as well.
Driven until it protested. Clattering, an uneven idle, smoke, a throttle that has gone soft. The fuel isn't acting like diesel any more, and your motor is telling you. Stop wherever you are — the verge on Whitburn Road, a lay-by, a side street — then leave it there. Lasting damage is very uncommon when a car is pulled over quickly, and the fuel drain and flush that still go first deal with it.
Myths Whiteside motorists hear about petrol in a diesel
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Topping up takes out nothing; it gives you a fuller tank of the same mix. That guidance presumes a diesel fuel system handles petrol by percentage. It doesn't.
"Newer diesels can handle a little petrol" — a myth, and nearer the reverse. Protection counts more on modern diesels, not less, because their fuel runs through more precise parts at higher pressure.
"It starts, it drives, and so no harm done" — the myth that catches most people than any other. The driver of a petrol motor fed diesel normally has no choice but to stop, since it will not run, and the damage stops there. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump wears. Being able to run isn't the same as being fine.
Myth: "Add some two-stroke oil and drive the car home." It's an old fix for a different issue. It does not put back what petrol has weakened, and the petrol is still in your tank later on.
Myth: "Drain the tank yourself and you are sorted." Once your engine has been run, some of that petrol is no longer in your tank: it is in your filter and your lines, and it goes straight back through the pump at the next start. And, a can of petrol filled at the kerbside is genuinely dangerous.
How it happens: petrol in a diesel
It's rarely carelessness, and nobody does it on purpose. A diesel nozzle generally won't go into a petrol car, but the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error easy, and only in one direction.
It takes place when habit and your car stop matching. A new motor, a hire car or a courtesy car. One petrol and one diesel on the drive of the same household. Your normal forecourt, its pumps now in a different order. Rushing for a train at Bathgate and fuelling up en route. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it happens. Throw in a back seat full of children, a phone call or rain, and habit takes over.
How to avoid petrol in a diesel on your next fill-up around Whiteside
- Read the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on every forecourt. The label is what matters.
- Many motors state the fuel type inside the filler flap or on the cap, so check it on the first fill in any motor you do not know.
- Good intentions do less than a sticker or a fob in a bright colour on the diesel's key if a house has one of each. So label it.
- It sounds silly and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, and so put the phone away then keep your mind on the petrol pump.
- Some diesels have a filler built to refuse a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the petrol pump.
- As soon as you notice, stop: less petrol in your tank makes a thinner blend. What to do next does not change, though — still don't fire it up.
Petrol already in a diesel around Whiteside? Begin here
Then the order of things is brief. Do not switch your ignition on, and do not start it. Ask the attendants to help you push it clear of the pump if you're still at the forecourt, whether that's Morrisons or anywhere else. Phone 0333 366 0103 next, with three facts — the fuel, the approximate quantity, and if it has run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a different issue — Whiteside has a page all for it.
One petrol in a diesel task around Whiteside costs more than another. Why?
There's no honest single price for this, because the four scenarios above are four separate tasks. The situation itself does most of the work of moving your cost. Where the car is matters too, and whether a technician can safely get to it, after the ratio of petrol to what the tank holds.
That's why we ask three queries before costing rather than after: what was put in, how much, and if it's run. With those answers, you get a straight figure instead of a range.
About Whiteside and its setting
Whiteside is a suburban area situated on the riverside in West Lothian, with a mix of detached housing and local amenities. Whiteside sits at an elevation of 145 metres, overlooking the surrounding countryside. Whiteside is located near several other suburban areas, including Standhill, Paulville, and Windyknowe, and is approximately 14 miles from Dunfermline. Whiteside has a population of around 3843 residents, living in predominantly detached homes.
Whiteside and West Lothian: where our fuel drain cover runs
Standhill, Paulville and Windyknowe are among the places near Whiteside that the same vans work, answering petrol in diesel jobs across Whiteside's EH postcode area. No need to bring the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all locations we drain.
At the pump around Whiteside, still?
No position is better: that is where you are. Turned off it stays; then ring.