Petrol in a Diesel Car in Portscatho: How Worried Should You Be?
Unstarted? Then less worried than you likely feel. Petrol sitting in a diesel tank does nothing to the motor until something pulls it through the fuel system — the ignition priming the pump, your starter, or driving on its own. So the truthful answer to the first question everyone in Portscatho asks, "have I ruined it?", is normally no. Leave your motor off and phone Petrol in Diesel — that keeps it that way. Read on for three things: the effect petrol has inside a diesel engine, the clues of how far it has spread, and the way to make sure you never do it again.
Inside the motor: what petrol in a diesel really does
Passing through a motor, diesel does two things at the same time. It lubricates to begin with, and only then does it burn. Very fine clearances are built into the injectors and the high-pressure fuel pump, and only your diesel flowing through stops those surfaces grinding together.
Poorly at the first, not at all at the second: that's petrol. A pump running on a petrol mix is wearing itself out, because petrol is thinner than diesel and takes away the lubrication your fuel system depends on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that's where any clattering starts.
Combined, those leave the shape of the issue clear. Not contact but circulation is what causes the harm. A tank with petrol in it is a fuel issue. The beginning of a mechanical problem is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with the fuel to your injectors downstream.
Petrol in a diesel around Portscatho: how serious is it? Four cases
Filled up, and not started: no case is better. On a forecourt, and really only there, the petrol is still confined to your tank — since anywhere else the car was driven to reach it. The task is emptying and rinsing on the spot.
The ignition switched on, or a short start. Once primed, your system has drawn petrol from that tank up to the filter and your lines. Drain, flush, see to the fuel filter: still usually simple.
Your pump has worked a few miles on weakened fuel — that is what driving it does. The work is the tank, the lines, the fuel filter and clean fuel through the entire system, and how hard the vehicle was driven counts as much as how far. Short trips, such as the school run to Gerrans School, are one thing. Very different once more: a run to Truro, under 10 miles away, or some mileage on the M5, over 50 miles from Portscatho, where the motor never stopped labouring hard.
Driven on until it complained — rattling, smoke, an uneven idle, a soft throttle. The engine is telling you your fuel is no longer acting like diesel. Leave it wherever it stops: a lay-by, a quiet street, the verge on Wellington Terrace. Lasting damage is very uncommon when a car is stopped quickly, and the fuel drain and flush that still come first deal with it.
Petrol in a diesel myths Portscatho people hear
False: topping up to full with diesel makes it fine. It does not. A bigger tank of the same mixture is all it gives, since topping up takes out nothing. Percentage isn't how a diesel fuel system copes with petrol, whatever that guidance presumes.
If anything, the opposite is true. Myth: "A current diesel can cope with a bit of petrol." Smaller components and higher pressure are how a newer diesel runs its fuel, and that makes the protection count more, not less.
One myth that catches motorists out: if it starts and drives, it must be unharmed. The motorist of a petrol engine fed diesel normally has no choice but to stop, since it will not run, and the damage stops with them. Whilst the pump grinds, a diesel fed petrol usually starts, idles and drives away as if nothing has happened. Fine and running are not the same at all.
Myth: "Add some two-stroke oil and drive the vehicle home." It's an old fix for a different fault. None of what petrol diluted is put back by it — and afterwards, your tank still holds the petrol.
Myth: "Drain the tank yourself and you're sorted." Once your engine has been run, some of that petrol is no longer inside that tank: it is in your filter and your lines, and it goes right back through the pump at the next start. Also, a can of petrol filled at the roadside is genuinely dangerous.
Why petrol in a diesel occurs so easily
Carelessness is seldom the cause, and nobody means to do it. The petrol nozzle is the smaller of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol car at all. The forecourt makes it easy, and the error runs one way.
It happens when habit and the vehicle stop matching. Courtesy car, hire car, or a car that's new. 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 en route to Falmouth Docks. Exactly the moment it occurs: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. With rain, a call arriving, or a car full of children to deal with, the hand simply does what it always has.
How to prevent petrol in a diesel on your next fill-up around Portscatho
- Green for unleaded and black for diesel is usual in the UK — yet not on every forecourt. Trust the label on the pump, not the colour.
- Check the filler flap. Plenty of motors state the fuel inside the flap or on the cap. Look at it on your first fill in any car you don't know.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of intending to remember, for a household with one of each.
- It seems daft and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the pump.
- Whilst you're thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Add-on devices are available for cars without one, and some diesels are built with a filler that won't take a petrol nozzle. Helpful — but a backstop only, never a reason to stop checking the label.
- Stop as soon as you notice. Less petrol in that tank means a thinner mix. It doesn't change what to do next, which is still not to crank it.
Put petrol in a diesel around Portscatho already?
Then the order of things is short. Do not fire it up, and don't turn the ignition on. The attendants on the forecourt — whether at Esso itself or wherever you filled up — will normally help roll it clear of the pump if you ask. Call 0333 366 0103 next, with three answers — your fuel, the rough volume, and whether it's run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a separate problem — Portscatho has a page all for it.
What makes one Portscatho petrol in a diesel job cost more than the next
The four scenarios above are four separate jobs, so no single quote for this would be fair. The situation itself does most of the work of moving your cost. Two things come after that: the petrol that went in as a proportion of what your tank takes, then the spot the car is in and whether our van can get to it safely.
Three queries come first, before quoting, instead of after — what went in, how much, has it run — and this is the reason. With those answers, you get a straight figure instead of a range.
About Portscatho itself
Portscatho is a small coastal village in Cornwall, situated on the Roseland Peninsula near the villages of Gerrans and Trewithian. Portscatho sits at a low elevation of around 17 metres, with its detached houses and other buildings looking out over the sea. Portscatho is close to the city of Truro, which is about 6.7 miles away, and is a popular spot for those who enjoy the coastal scenery of the South West. Portscatho has a population of around 588 people, who live in the village's predominantly detached houses.
Fuel drain cover across Cornwall, Portscatho included
Portscatho rests in the TR postcode area, and the vans that answer petrol in diesel calls there work the spots around it as well — Gerrans, Rosevine and Trewithian among them. The vehicle doesn't need to move to us: our engineers drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
In Portscatho and still at the petrol pump?
Then you are in the best place there can be. Turned off it remains; then call.