Aghadrumsee: Petrol in a Diesel Car? How Worried to Be
Likely less than you are now — as long as no one has started it. "Have I wrecked it?" is the first thing everyone around Aghadrumsee asks, and the truthful answer is normally no, because petrol left in a diesel tank harms nothing till it's drawn through your fuel system — by ignition priming, by your starter, or by driving. Petrol in Diesel is who to call, with the engine left off, and so it stays that way. Keep reading for three things: the effect petrol has inside a diesel engine, the signs of how far it has got, and the way to make sure you never repeat it.
Petrol in a diesel: what does it do to your engine?
Diesel has two tasks on its way through a motor. It lubricates first, and after that does it burn. The high-pressure fuel pump and your injectors are built to extremely fine gaps, and the diesel passing through them is what keeps those surfaces from wearing against each other.
Of those two jobs, petrol manages the first poorly and the second not at all. Being less viscous than diesel, petrol strips out the protection a fuel system needs, so a pump running on the mixture wearing itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is why you hear the rattling.
Seen together, they show the shape the trouble takes. The damage is done by movement, not by contact. All a tank with petrol in it amounts to is a fuel issue. Once the pump has been labouring on that petrol, a mechanical fault has started: anything shed by a pump that is wearing is carried onward to the fuel injectors with the fuel.
Petrol in a diesel in Aghadrumsee: how serious is it? Four cases
Filled but never started — as good as it gets. Only your tank has petrol in it, and so the task is clearing the tank and rinsing the fuel system where your car stands. This situation can only really occur on a forecourt: anywhere else, the vehicle got there by being driven.
Your ignition switched on, or a brief start. With the fuel system primed, your lines and filter now hold petrol that has come from that tank. Drain, flush, see to your filter: still normally simple.
Those few miles driven were the pump labouring on fuel diluted by petrol the whole way. Distance is only half of it; how hard it was driven matters equally. Either way this work runs to your tank, your lines, the filter and clean fuel through the entire circuit. Short trips, like the school run to the local primary school, are one thing. Very different once more: a run to Armagh, under 50 miles away, or some distance on the M77, over 50 miles from Aghadrumsee, where your engine kept working hard.
Driven till it complained. Clattering, a ragged idle, smoke, a throttle that has gone soft. The fuel isn't behaving like diesel any more, and your engine is saying so. Pull up on the spot — on the verge on Heugh Road, at the kerb, down a side road — and don't move it again. The fuel drain and flush still come first, and they deal with it: when a car is stopped quickly, long-term damage is very uncommon.
Aghadrumsee people and the petrol in a diesel stories they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing is removed when you top up — your tank simply holds more of the same blend. That advice presumes a diesel fuel system tolerates petrol by percentage. It does not.
"Current diesels can handle a little petrol" — a myth, and nearer the reverse. Protection matters more on current diesels, not less, because their fuel runs through smaller parts at higher pressure.
"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 normally has no choice but to stop, since it will not run, and the damage stops there. Whilst the pump grinds, a diesel fed petrol normally starts, idles and drives away as if nothing has happened. Fine and running are not the same at all.
An old fix for a different fault lies behind this one. Myth: "Add some two-stroke oil and drive the car home." None of what petrol thinned is put back by it — and afterwards, the tank still holds the petrol.
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's in your filter and the fuel lines, and it goes right back through the pump on the next start. Emptying petrol into a can by the kerbside is also genuinely risky.
Petrol in a diesel: how does it take place?
It's rarely carelessness, and no one does it on purpose. The forecourt makes it easy: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle generally won't go into a petrol car at all. So the slip runs one way.
Habit and your car getting out of step is when it occurs. Hire cars, courtesy cars, and cars that are new to you. Two cars on one drive, one petrol, one diesel. The pumps in a different order on a well-known forecourt. Fuelling up in a hurry en route to the nearest station, with a train to catch. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it takes place. Add rain, a phone call or a back seat full of kids, and the hand repeats what it has always done.
How to prevent petrol in a diesel on your next fill-up in Aghadrumsee
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most usually do. Read the pump's label; the colour is only a clue.
- Plenty of motors state the fuel inside your filler flap or on the cap, so check it on your first fill in a car you don't know.
- Good intentions do less than a sticker or a fob in a bright colour on your diesel's key if a house has one of each. So label it.
- "Diesel", out loud, before you pick up the nozzle — each time a new or hired car needs its first tank. It sounds silly. It does the trick.
- Put your phone away. This is an easy mistake to make while you're thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to refuse a petrol nozzle, and add-on devices exist for motors without one. They are a backstop, not a reason to stop reading the petrol pump.
- Less petrol makes a weaker blend, so stop the moment you realise — though remembering that the next stage is unchanged. It is still not to start the vehicle.
Put petrol in a diesel around Aghadrumsee already?
In that case, there is just a short order of things. Do not switch your ignition on, and do not fire it up. Ask the attendants to help you roll it away from the petrol pump if you're still at the forecourt, whether that's the nearest petrol station or anywhere else. Then phone 0333 366 0103 and tell us what went in, about how much, and whether it's run.
If it was AdBlue rather than petrol, say so. That is a separate issue — corrosion and deposits rather than lost lubrication — and it has its own page for Aghadrumsee.
Aghadrumsee petrol in a diesel jobs: why one costs more than another
The four scenarios above are four separate tasks, so no single quote for this would be fair. The scenario itself does most of the work of moving your cost. The share counts next, meaning how much of that tank is petrol, and then the location of the car and whether getting to it is safe for a van.
That's why our engineers ask three queries before pricing rather than after: what got in, how much, and if it has run. Those replies are what change a range into one firm number.
About Aghadrumsee itself
Aghadrumsee is a small locality in County Fermanagh, situated inland at an elevation of 106 metres. Aghadrumsee lies near the villages of Magheraveely, Rosslea, and Newtownbutler, and is approximately 26 miles from Armagh. Aghadrumsee is characterised by its predominantly detached housing stock, reflecting its rural setting. Aghadrumsee is a relatively small community, with a population of around 599 people.
Across County Fermanagh and in Aghadrumsee: fuel drain cover
Our vans answering petrol in diesel calls in Aghadrumsee, in the BT postcode area, equally work the places near it, Magheraveely, Rosslea and Newtownbutler included. Our engineers drain where your car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Aghadrumsee: still at the petrol pump?
In that case, you couldn't be in a better spot. Keep it off. Call.