How Worried Should You Be? Petrol in a Diesel Car in Portchester
Probably less than you already are — provided no one has started the car. Petrol sitting in a diesel tank does nothing to your motor till something pulls it through your fuel system — the ignition priming the pump, your starter, or the drive on its own. So the honest answer to the first query anyone in Portchester asks, "have I ruined it?", is generally no. Keep it that way: leave your engine off and phone Petrol in Diesel. Keep reading for three things: the effect petrol has inside a diesel motor, the clues of how far it has spread, and ways to make sure you never do it again.
What petrol in a diesel does to your engine
On its way through an engine, diesel has two jobs. Before it ignites, it lubricates — and then it burns. Made to extremely fine tolerances, the fuel injectors and the pump rely on the diesel moving through them to stop their surfaces wearing against one another.
Petrol handles the first task badly and the second not at all. A pump running on a petrol mix is wearing itself out, since petrol is thinner than diesel and strips out the lubrication the fuel system relies on. Petrol is also made to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that is where any clattering comes.
The shape of the problem is plain when you put those together. It is movement that causes the damage, not contact. Petrol in a tank is a fuel fault. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with your fuel to the fuel injectors downstream.
Petrol in a diesel in Portchester: how bad is it? Four situations
Filled but never started — as good as it gets. Just the tank has petrol in it, and so the job is draining the tank and purging the fuel system where the car sits. This scenario can only truly take place at a forecourt: anywhere else, the car got there by being driven.
A moment's running, or merely the ignition on. Once primed, your system has pulled petrol from your tank as far as the fuel filter and your lines. Still usually straightforward: drain, flush, and the filter seen to.
A few miles driven, and the pump has spent each of them running on weakened fuel. Tank, lines, filter, then fresh fuel put through the entire system: that is this work, and the way the car was driven counts as much as the miles. Short trips, such as the school run to Northern Junior School, are one matter. Very different once more: a trip to Portsmouth, under 5 miles away, or any mileage on the M27, under a mile from Portchester, where the motor never stopped labouring hard.
It protested, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone ragged. The motor is telling you the fuel is no longer behaving like diesel. Pull up on the spot — on the verge on The Crossway, at the kerb, down a side road — and do not move it. Permanent damage is very uncommon when a car is stopped soon, and the drain and flush-through that still go first sort it out.
Portchester drivers and that petrol in a diesel stories they hear
False: topping up to full with diesel makes it fine. It doesn't. Nothing is removed when you top up — your tank just holds more of the same mixture. The assumption behind the guidance — that diesel fuel systems accept petrol by percentage — is wrong.
"Current diesels can handle a little petrol" — a myth, and closer to the opposite. At higher pressure, through finer parts: that's how a newer diesel moves its fuel, so the lubrication matters for more, not less.
Myth: "If it starts and drives, there's no harm done." This is the one that catches motorists. Feed diesel to a petrol engine and it normally will not run, so the driver stops — and the damage stops with them. While your pump grinds, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. A running engine doesn't mean fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a different issue. It doesn't put back what petrol has thinned, and that petrol is still inside the tank afterwards.
Myth: "Drain your tank yourself and you're sorted." Once the motor has been run, some of the petrol is no longer inside your tank: it is in the fuel filter and the fuel lines, and it goes right back through the pump at your next start. Also, a can of petrol drained at the kerbside is truly hazardous.
How does petrol in a diesel take place?
No one does it on purpose, and it is seldom carelessness. A diesel nozzle generally will not go into a petrol vehicle, but the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error easy, and only in one direction.
When habit and the car stop matching, it occurs. Any motor that is new to you — hired, on loan as a courtesy car, or brand new. One petrol and one diesel on the driveway of the same household. A well-known forecourt with the pumps in a different order. Filling up in a rush on the way to the nearest station, with a train to catch. Exactly the moment it occurs: after years of driving petrol, someone fills a diesel Volkswagen Tiguan for the first time. Add rain, a phone call or a back seat full of kids, and the hand repeats what it has always done.
Avoiding petrol in a diesel next time you fill up in Portchester
- 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 just a clue.
- In a motor you don't know, look inside the flap over your filler or at the cap before the first fill: many motors state the fuel type there.
- A coloured fob or a sticker on the diesel's key does more than any amount of intending to remember, in a home with one of each.
- Before the nozzle comes off the petrol pump the first time you fill a hired or new motor, say "diesel" aloud. Silly, perhaps, but it works.
- Mistakes like this are easy to make whilst your mind is on something else, and so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to refuse a petrol nozzle, and aftermarket devices exist for the rest. Treat it as a safety net, and keep reading the petrol pump.
- Noticing it halfway? Stop at once. A weaker blend results from less petrol inside that tank, but the next stage stays the same: do not fire it up.
Already put petrol in a diesel in Portchester?
Then the order of things is brief. Don't turn the ignition on, and do not fire it up. If you are still on the forecourt — BP or anywhere else — ask the attendants to help you push it away from the pump. What went in, about how much, and whether it's run: tell us those when you call 0333 366 0103.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a different issue — Portchester has a page just for it.
Why one petrol in a diesel task in Portchester costs more than another
Four different jobs sit behind the four scenarios above — which is why there's no honest single quote. Chiefly, your cost moves with which situation you're in. The ratio counts next, meaning how much of your tank is petrol, followed by the location of your car and whether reaching it is safe for a van.
That is why we ask three questions before quoting rather than after: what went in, how much, and if it's run. Given those answers, there is a straight figure rather than a range.
About Portchester
Portchester is a suburban area in Hampshire, situated on the coast near Portsmouth, with a mix of semi-detached housing and other residential properties. Portchester sits at a low elevation of around 5 metres, close to the shoreline and overlooking the Solent Strait. Portchester is part of the larger Portsmouth urban area, but retains its own distinct character as a smaller community. Portchester is near other suburban areas like Port Solent and Paulsgrove, and is within easy reach of the city of Portsmouth.
Fuel drain cover in Portchester and across Hampshire
Petrol in diesel call-outs around Portchester — part of the PO postcode area — go to vans that likewise cover the locations round it, Port Solent, Paulsgrove and Downend among them. No need to bring the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots we drain.
At the petrol pump in Portchester, right now?
In that case, you couldn't be in a better place. Keep it off. Call.