Crofton: Petrol in a Diesel Car? How Worried to Be
Far less than you likely are, provided it has not been started. "Have I ruined it?" is the first thing everyone around Crofton asks, and the honest answer is normally no, because petrol resting in a diesel tank harms nothing till it's dragged through your fuel system — by ignition priming, by the starter, or by driving. Petrol in Diesel is who to phone, with the engine left off, and so it remains that way. Further down, you will find what petrol really does inside a diesel, how far it may have got, and how to stop it happening to you again.
What petrol in a diesel does to the engine
Two jobs fall to diesel on its route through a motor. Before it combusts, it protects — then it burns. Made to very fine gaps, the injectors and the pump rely on the diesel moving through them to stop their surfaces wearing against one another.
Of those two jobs, petrol handles the first badly and the second not at all. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump running on that mixture to wear itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is where you hear the knocking.
Put those together and the shape of the problem is plain. The damage is done by movement, not by contact. Petrol in a tank is a fuel fault. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with your fuel to your injectors downstream.
Petrol in a diesel in Crofton: how serious is it? Four situations
Fuelled up, never started. The best case there is. At a forecourt, and really only there, that petrol is still confined to that tank — since everywhere else your car was driven to reach it. The job is emptying and rinsing on the spot.
Started for a moment, or just your ignition on. Petrol has come out of that tank and reached your filter and your lines, since your system has been bled. Normally little more than draining, rinsing and sorting your filter, so still straightforward.
Those few miles driven were the pump running on fuel thinned by petrol the whole way. The work is that tank, your lines, the filter and fresh fuel through the whole circuit, and how hard your car was driven matters as much as how far. Driving the children to Holy Innocents Catholic Primary School is one sort of trip. A run as far as London, under 15 miles away, is a very different task. So is any miles on the M25, under 3 miles from Crofton, where the engine has been running hard the whole time.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone ragged. That is your motor telling you its fuel has stopped acting like diesel. Whether it's the verge on York Rise, a lay-by or a side street, stop where you are and leave it. Lasting damage is very rare when a car is pulled over quickly, and the drain and flush that still go first sort it out.
Crofton drivers and that petrol in a diesel myths they hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. A bigger tank of the same mixture is all it gives, since topping up takes out nothing. That advice supposes a diesel fuel system handles petrol by percentage. It does not.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the reverse. A newer diesel sends its fuel through more precise parts at higher pressure, which makes the lubrication 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 motor fed diesel usually has no choice but to stop, since it will not run, and the harm stops there. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile your pump grinds. Running isn't the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate problem. It doesn't put back what petrol has weakened, and that petrol is still in the tank later.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol sits in your filter and lines, ready to go right back through your pump on the next start. On top of that, petrol emptied into a can by the road is truly dangerous.
How petrol ends up: petrol in a diesel
On purpose? Never. Through carelessness? Seldom, if ever. The petrol nozzle is the slimmer of the two and slides 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 easy, and the slip runs one way.
When routine and the car stop matching, it takes place. Any motor that's new to you — hired, on loan as a courtesy car, or brand new. A household with one petrol and one diesel on the drive. A forecourt you know, only with its pumps laid out differently. Rushing for a train outside Orpington and filling up en route. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: exactly when it occurs. With rain, a call arriving, or a car full of children to deal with, your hand just does what it has always done.
Avoiding petrol in a diesel next time you fill up in Crofton
- Read the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, yet not on each forecourt. The label is what matters.
- Plenty of motors state the fuel type inside the filler flap or on the cap, and so check there on your first fill in any motor you don't know.
- One of each in the home? Label your key to your diesel — a coloured fob, a sticker — because intending to remember isn't enough.
- Before the nozzle leaves the pump the first time you fuel a hired or new car, say "diesel" out loud. Silly, yes, but it works.
- Thinking about something else is when this becomes an easy mistake to make, so put the phone away and keep your mind on the petrol pump.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to block a petrol nozzle, and aftermarket devices exist for the rest. Count it as a safety net, and keep reading the petrol pump.
- Less petrol makes a thinner mix, and so stop as soon as you realise — though remembering that your next step is unchanged. It is still not to start the car.
Crofton: already put petrol in a diesel?
Then, there is just a short order of things. Do not start the vehicle, and don't switch the ignition on. Ask the attendants to help you push it clear of the pump if you're still on the forecourt, whether that's Texaco or somewhere else. What went in, about how much, and if it's run: tell us that when you phone 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a separate problem — Crofton has a page all for it.
What makes one Crofton petrol in a diesel job cost more than the next
Four different jobs lie behind the four situations above — which is why there is no fair single price. Mostly, your cost shifts with which situation you're in. Beyond that it's the proportion — how much petrol went in against how much your tank takes — and after that where the car is and whether a technician can get to it safely.
Three queries come first, before any quote, rather than after — what was put in, how much, has it run — and this is the reason. With the replies, you get a straight figure instead of a range.
About Crofton itself
Crofton is a suburban area in Greater London, situated approximately 13 miles from central London and near the towns of Orpington and Goddington. Crofton sits at an elevation of around 92 metres, with a mix of semi-detached housing and local amenities. Crofton is part of the larger London urban area, with Broom Hill nearby. Crofton has a population of around 6565 people, making it a small but distinct community within the region.
Fuel drain cover in Crofton and across Greater London
Crofton waits in the BR postcode area, and the teams that answer petrol in diesel jobs there work the locations near it as well — Orpington, Broom Hill and Goddington among them. The vehicle doesn't need to come to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
At the petrol pump around Crofton, right now?
Nothing beats it: that's where you are. Ring, and leave it turned off.