Petrol in a Diesel Car in Banbridge: How Worried Should You Be?
Less than you likely are, if it hasn't been started. "Have I wrecked it?" is the first question everyone in Banbridge asks, and the honest answer is usually no, since petrol resting in a diesel tank hurts nothing till it's dragged through the fuel system — by ignition priming, by the starter, or by being driven. To keep the car that way, ring Petrol in Diesel then leave your engine switched off. The remainder of this page sets out what petrol really does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you a second time.
Petrol in a diesel: what does it do to the motor?
Diesel does two jobs on its way through a motor. It ignites, and before it ignites it lubricates. Designed to extremely fine clearances, the fuel injectors and the pump depend on the diesel moving through them to stop their surfaces wearing against one another.
Petrol does the first task badly and the second not at all. Being less viscous than diesel, petrol strips out the protection a fuel system needs, so a pump on the blend wearing itself. It's also made to resist igniting under compression — the reverse of what a diesel needs — which is why you hear the clattering.
Put those together and the shape of the problem is plain. The harm is done by circulation, not by contact. Petrol in a tank is a fuel problem. The beginning of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds moves on with your fuel to the injectors downstream.
Petrol in a diesel in Banbridge: how serious is it? Four situations
The best case there is: filled up, never started. Being on a forecourt is what makes this the case: elsewhere, the car has been driven there to begin with. With that petrol kept in the tank alone, it is drained and cleaned on the spot, and nothing more is needed.
A brief spell of running, or merely your ignition on. With your system primed, the lines and filter already hold petrol that came from that tank. Drain, flush, deal with the fuel filter: still normally easy.
The pump now spent a couple of miles on diluted fuel — that's what driving the car meant. Tank, lines, filter, then fresh fuel put through the entire system: that's this work, and the way the car was driven counts as much as the miles. Driving the kids to the local primary school is one sort of trip. A run as far as Newry, under 15 miles away, is a very different job. So is any mileage on the M77, over 50 miles from Banbridge, where your engine has been working hard the whole time.
Driven on until it protested — clattering, smoke, a lumpy idle, a dead throttle. The fuel isn't behaving like diesel any more, and your engine is telling you. Pull up wherever you are — the verge on Dunskey Street, a lay-by, a side street — and leave the car there. Long-term damage is very rare when a vehicle is pulled over soon, and the fuel drain and flush that still go first sort it out.
Banbridge drivers and that petrol in a diesel stories they hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing comes out when you top up — your tank just holds more of the same blend. A diesel fuel system does not accept petrol by percentage in the way that advice supposes.
Not so: a modern diesel copes with a bit of petrol. Rather, the reverse. A modern diesel sends its fuel through finer components at higher pressure, which makes the protection count more, not less.
This is the one that fools motorists. Myth: "If it starts and drives, there is no harm done." The motorist of a petrol engine fed diesel normally stops, since it will not run, and the harm stops with them. Whilst your pump grinds, a diesel fed petrol normally starts, idles and drives away as though nothing has happened. Fine and running aren't the same at all.
An outdated workaround for a different fault lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." It doesn't put back what petrol has diluted, and that petrol is still inside your tank later on.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol sits in the fuel filter and lines, ready to go straight back through the pump on the next start. And, a can of petrol filled by the kerbside is truly risky.
Why petrol in a diesel occurs at all
Carelessness is rarely the cause, and no one means to do it. A diesel nozzle mostly will not fit a petrol car, but the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake straightforward, and only in one direction.
The moment habit stops matching your car is the moment it happens. A vehicle that is new to you — a hire car, on loan as a courtesy car, or brand new. Households running one of each, petrol and diesel. Your usual forecourt, its pumps suddenly in a different order. A rushed fill en route to the nearest station with a train to catch. Years of petrol motors behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that is when. Throw in rain, a phone call or a back seat full of kids, and your hand does what it has always done.
Banbridge people: how to avoid petrol in a diesel next time
- The label is what counts, so read the petrol pump rather than the colour: in the UK unleaded handles are usually green and diesel black, yet not on every forecourt.
- Check your filler flap. Many vehicles state the fuel inside the flap or on the cap. Look at it on your first fill in a motor you do not know.
- Good intentions count for less than a sticker or a fob in a vivid colour on your diesel's key when a house has one of each. So label it.
- "Diesel", aloud, before you pick up the nozzle — each time a new or hired car gets its first tank. It sounds silly. It does the trick.
- While you are thinking about something else, this is an easy mistake to make — so put your phone away.
- Add-on devices exist for cars without one, and some diesels come with a filler that won't accept a petrol nozzle. Helpful — but a safety net only, never a reason to stop checking the label.
- Noticing it halfway? Stop there and then. A weaker mixture follows from less petrol inside the tank, but the next step remains the same: don't crank it.
Petrol already in a diesel in Banbridge? Begin here
Then the order of things is short. Do not crank it, and do not turn the ignition on. If you are still at the forecourt — the nearest petrol station or anywhere else — ask the staff to help you push the vehicle clear of the petrol pump. What went in, about how much, and whether it's run: tell us those when you ring 0333 366 0103.
If it was AdBlue instead of petrol, say so. That is a separate problem — corrosion and deposits instead of lost lubrication — and it has its own page for Banbridge.
Why one petrol in a diesel task in Banbridge costs more than another
Four different jobs lie behind the four scenarios above — which is why there is no honest single price. The situation itself does most of the work of moving the cost. Two things follow that: the petrol that got in as a share of what that tank takes, then the spot the car is in and whether a technician can get to it safely.
That's why we ask three questions before quoting instead of after: what got in, how much, and if it has run. Those answers change a range into a straight figure.
About Banbridge
Banbridge is a town in County Down, situated in the inland area of Northern Ireland, with an elevation of 74 metres. Banbridge lies near the towns of Lawrencetown, Loughbrickland, and Tullylish, and is approximately 12 miles from Newry. Banbridge has a population of around 15016 people, predominantly living in semi-detached housing. Banbridge is located about 322 miles from London, making it a significant urban centre in the region.
Banbridge and County Down: where our fuel drain cover reaches
Petrol in diesel call-outs around Banbridge — part of the BT postcode area — go to teams that likewise cover the locations round it, Lawrencetown, Loughbrickland and Tullylish included. A forecourt, a supermarket car park, a lay-by or your own driveway are all places our engineers work, and your car doesn't need to come to us.
At the petrol pump in Banbridge, still?
The best position there is, then — that is where you are. Keep it off. Ring.