Bryansford: Petrol in a Diesel Car? How Worried to Be
Less than you likely are, if it hasn't been started. "Have I ruined it?" is the first thing anyone in Bryansford asks, and the truthful answer is normally no, because petrol resting in a diesel tank hurts nothing until it's dragged through your fuel system — by ignition priming, by the starter, or by being driven. Leave your motor off then ring Petrol in Diesel — that keeps it that way. Read on for three things: the effect petrol has inside a diesel motor, the clues of how far it has spread, and the way to make sure you don't repeat it.
What petrol in a diesel does to the motor
On its way through a motor, diesel does two tasks. It protects first, and after that does it burn. What stops the surfaces inside your high-pressure pump and your injectors from wearing down against each other is your diesel flowing through them — they're built to extremely fine tolerances.
The second job petrol does not do at all, and the first it does badly. It's thinner than diesel and takes away the lubrication the system depends on, so a pump running on a petrol blend is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That's where the knocking comes from.
The shape of the trouble is plain once you put those together. Not contact but circulation is what does the damage. All a tank with petrol in it amounts to is a fuel issue. After the pump has been working on that petrol, a mechanical issue has started: anything shed by a pump that is grinding travels onward to the injectors with your fuel.
Petrol in a diesel in Bryansford: how bad is it? Four cases
The best case there is: filled up, not once started. Just your tank has petrol in it, so the task is clearing that tank and rinsing the fuel system where the vehicle sits. This scenario can only truly take place on a forecourt: anywhere else, the car got there by being driven.
The ignition turned on, or a short start. Once primed, your system has drawn petrol from that tank as far as your filter and the lines. Drain, flush, see to the fuel filter: still normally easy.
Some miles driven, and the pump has spent every one of them working on thinned fuel. How hard the car was driven counts as much as how far, and this work covers that tank, the fuel lines, the filter and clean fuel through the entire system. A school run to the local primary school is one thing. Any mileage on the M77, over 50 miles from Bryansford, means your engine has worked hard throughout, and a run to Newry, under 25 miles away, makes a very different task too.
Clattering, a ragged idle, smoke, a throttle gone soft: driven until it complained. That is the motor telling you its fuel no longer is acting like diesel. Stop wherever you are — the verge on B7041, a lay-by, a side street — and leave the car there. What goes first is still the drain and flush-through, and that takes care of it, with long-term damage very unusual when a car is stopped early.
Petrol in a diesel stories Bryansford people hear
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. Nothing comes out when you top up — the tank just holds more of the same mixture. The assumption behind the guidance — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. More precise parts and higher pressure are how a current diesel runs its fuel, and that makes the protection count more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that fools people. Diesel in a petrol motor normally leaves a motor that will not run: the motorist stops, and so does the harm. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile your pump wears. Running is not the same as fine.
Myth: "Add some two-stroke oil and drive it home." It is an outdated workaround for a different issue. The petrol is still in the tank after that, and what it has thinned is not put back.
The next start sends petrol back round the pump from your lines and the fuel filter, where some of it sits once the engine has been run. That is why a DIY tank drain doesn't sort it — a myth. Clearing petrol into a can at the kerbside is also genuinely hazardous.
How it happens: petrol in a diesel
On purpose? Never. Through carelessness? Rarely, if ever. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol vehicle at all. The forecourt makes it simple, and the mistake runs one way.
It occurs when routine and the car stop matching. A vehicle that's new to you — a hire car, on loan as a courtesy car, or just bought. A household with one petrol and one diesel on the driveway. A familiar forecourt with the pumps in a different order. A train to catch, and a rushed fill on the way to the nearest station. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that is when. 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 Bryansford
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most usually do. Check the petrol pump's label; the colour is just a hint.
- The first fill in an unfamiliar vehicle is the time to check the filler flap — on it, or on the cap, plenty of motors state the fuel they take.
- 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.
- Before the nozzle leaves the petrol pump the first time you fuel a hired or new motor, say "diesel" out loud. Silly, perhaps, but it does the trick.
- Tuck your phone away. This is an easy mistake to make whilst you're thinking about something else.
- Some diesels come with a filler designed to reject a petrol nozzle, and devices you can add are available for motors without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump.
- Less petrol makes a thinner mix, so stop as soon as you realise — though remembering that the next step is unchanged. It is still not to start it.
Already put petrol in a diesel around Bryansford?
In that case, there's just a short order of things. Do not turn the ignition on, and do not start it. Ask the attendants to help you push it away from the petrol pump if you are still on the forecourt, whether that is the nearest petrol station or somewhere else. Then phone 0333 366 0103 and tell us what was put in, about how much, and whether it's run.
Say so if it was AdBlue instead of petrol: it is a different problem, with its own page for Bryansford, since AdBlue brings corrosion and deposits instead of lost protection.
What makes one Bryansford petrol in a diesel job cost more than the next
The four situations above are four different jobs, so no single quote for this would be honest. Which of them you're in is chiefly what shifts the cost. Two things follow that: the petrol that got in as a share of what your tank holds, then the spot your car is in and whether a technician can get to it safely.
Ahead of any quote, not after, we ask three queries: the fuel that was put in, its volume, and if it's run. That is why. A range becomes a straight figure once the replies are in.
About Bryansford
Bryansford is a small locality in County Down, situated near the coast of Northern Ireland, with an elevation of 201 metres. Bryansford lies close to the towns of Newcastle and Castlewellan, and is approximately 17 miles from the city of Newry. Bryansford is characterised by its predominantly detached housing stock, reflecting its rural setting. Bryansford is also near the village of Annsborough, in the heart of the County Down countryside.
Across County Down and in Bryansford: fuel drain cover
Newcastle, Annsborough and Castlewellan are among the places around Bryansford that the same vans work, answering petrol in diesel call-outs across Bryansford's BT postcode area. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots we work, and the vehicle does not need to move to us.
At the pump in Bryansford, still?
In that case, you couldn't be in a better spot. Keep it off. Phone.