How Worried Should You Be? Petrol in a Diesel Car in Bynea
Far less than you likely are, provided it has not been started. Till your ignition primes your pump, the starter turns, or your vehicle is driven, petrol in a diesel tank simply rests there and does no harm. Which means the truthful reply to that first Bynea query — "have I ruined it?" — normally no. To leave the vehicle that way, ring Petrol in Diesel and leave the engine alone. What petrol really does to a diesel, how to gauge how far it has travelled, and how to keep it from happening again: that's the remainder of this page.
Petrol in a diesel: what does it do to the engine?
Passing through a motor, diesel is doing two jobs at once. It protects to begin with, and only then does it burn. The high-pressure fuel pump and the fuel injectors are designed to very fine tolerances, and the diesel passing through them is what keeps those surfaces from wearing against one another.
The second job petrol doesn't do at all, and the first it does poorly. Being less viscous than diesel, petrol strips away the protection a fuel system needs, leaving a pump running on the mixture wearing itself. It is equally made to resist igniting under compression — the opposite of what a diesel needs — which is where you hear the clattering.
Put those together and the shape of the trouble is clear. Not contact but circulation is what does the damage. All a tank with petrol in it amounts to is a fuel issue. Once the pump has been working on that petrol, a mechanical problem has started: anything shed by a pump that is grinding travels onward to your injectors with the fuel.
Four scenarios we see around Bynea: how bad is petrol in a diesel?
Filled up, not once started. The best case there is. That petrol is in your tank and only that tank, and the job is a drain and a flush where the vehicle sits. This is the one situation that can only really happen at a forecourt, as anywhere else the car has been driven to get there.
A brief spell of running, or just the ignition on. Petrol has left your tank and got to the fuel filter and the lines, because the fuel system has been bled. Drain, flush, see to the filter: still usually simple.
Driven a couple of miles. Now the pump has spent these miles running on weakened fuel. Miles is only half of it; how hard it was driven matters just as much. Either way the work includes that tank, your lines, the fuel filter and fresh fuel through the entire system. On the school run to the local primary school, the miles is small. Very different once more: a run to Swansea, under 10 miles away, or some miles on the M4, under 3 miles from Bynea, where the engine never stopped working hard.
Driven on till it complained — clattering, smoke, a ragged idle, a dead throttle. The fuel is not acting like diesel any more, and the engine is telling you. Whether it's the verge on Heol-y-Bwlch, a lay-by or a side street, stop where you are then leave it. What comes first is still the fuel drain and flush-through, and that deals with it, with permanent damage very uncommon when a car is pulled over quickly.
Bynea people and that petrol in a diesel myths they hear
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. Nothing is removed by topping up — you're left with a fuller tank, still the same mix. A diesel fuel system does not accept petrol by percentage in the way that guidance assumes.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. Protection matters more on newer diesels, not less, because their fuel passes through more precise components at higher pressure.
Myth: "If it starts and drives, there's no damage done." This is the one that fools people. Any petrol motor fed diesel generally will not run, so the driver stops and the harm stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile your pump grinds. A running engine doesn't mean fine.
Myth: a two-stroke additive lets you to drive home. It is an old workaround, meant for another fault. What petrol has weakened stays weakened, and that petrol stays inside your tank regardless.
If the motor has been run, part of that petrol sits in the fuel filter and the fuel lines, not that tank — and your next start sends it right back through the pump. So the myth "drain the tank yourself and you are sorted" does not stand up. It's also really hazardous to drain petrol into a can at the roadside.
Petrol in a diesel: how does it happen?
No one does it on purpose, and it is seldom carelessness. One way only, because of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, while the diesel one generally will not fit a petrol motor. That's how the forecourt makes it simple.
It occurs when habit and the car stop matching. A new car, a hire car or a courtesy car. One petrol and one diesel on the drive of the same household. A well-known forecourt with the pumps in a different order. A rushed fill en route to the nearest station with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver used to petrol: precisely when it happens. Add rain, a phone call or a back seat full of kids, and the hand does what it has always done.
Next time you fill up in Bynea: avoiding petrol in a diesel
- A green handle for unleaded and black for diesel is usual in the UK — yet not on every forecourt. Trust the label on the petrol pump, not the colour.
- Many motors state the fuel inside your filler flap or on the cap, so check there on the first fill in a vehicle you do not know.
- Label your key. In a household with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember.
- It seems silly and it does the trick: on your first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump.
- Whilst you're thinking about something else, this is an easy mistake to make — so put your phone away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to block a petrol nozzle, and add-on devices are available for cars without one. They are a backstop, not a reason to stop reading the pump.
- Less petrol means a thinner mixture, so stop as soon as you realise — though remembering that the next stage is unchanged. It's still not to crank it.
Already put petrol in a diesel around Bynea?
Then the order of things is brief. Leave it unstarted, with the ignition switched off as well. The staff on the forecourt — whether at Texaco itself or wherever you filled up — will usually help push it away from the pump if you ask. 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 fault — corrosion and deposits instead of lost lubrication — and it has its own page for Bynea.
Why one petrol in a diesel job around Bynea costs more than another
There is no honest single quote for this, because the four situations above are four separate jobs. What shifts your cost is mostly which of them you are in. Where the vehicle is counts too, and whether a technician can safely get to it, after the share of petrol to what the tank holds.
That's why our engineers ask three questions before pricing rather than after: what was put in, how much, and if it has run. The answers turn a range into a straight figure.
About Bynea
Bynea is a small coastal suburban area in Carmarthenshire, situated near the mouth of the Loughor estuary. Bynea has a low elevation of around 6 metres above sea level and is located close to the nearby communities of Yspitty, Llwynhendy, and Cwmcarnhywel. Bynea is characterized by its predominantly semi-detached housing stock and is within commuting distance of Swansea, the nearest city. Bynea is part of the wider Swansea Bay area, with the city of Swansea being approximately 7.5 miles away.
Bynea and Carmarthenshire: where our fuel drain cover reaches
Bynea rests in the SA postcode area, and the vans that answer petrol in diesel call-outs there work the places around it as well — Yspitty, Llwynhendy and Cwmcarnhywel among them. Our engineers drain where your car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the pump in Bynea?
Nothing beats it: that's where you are. Switched off it stays; then phone.