How Worried Should You Be? Petrol in a Diesel Car in Lade
If it hasn't been started, worry less than you probably are. Till the ignition primes the pump, your starter cranks, or the vehicle is driven, petrol in a diesel tank just sits there and does no harm. Which means the honest reply to the first Lade query — "have I wrecked it?" — normally no. Keep it that way: leave your engine off and ring Petrol in Diesel. What petrol actually does to a diesel, how to judge how far it has gone, and how to keep it from happening again: that's the rest of this page.
What petrol in a diesel does to the engine
Passing through an engine, diesel is doing two things at once. Oiling comes before burning; it does both. Built to very fine tolerances, the fuel injectors and the pump depend on the diesel flowing through them to keep their surfaces from wearing against one another.
The second task petrol does not do at all, and the first it does badly. Being less viscous than diesel, petrol strips out the protection a fuel system needs, leaving a pump on the blend wearing itself. It's equally made to resist igniting under compression — the reverse of what a diesel needs — which is where you hear the clattering.
The shape of the trouble is plain once you put those together. Contact doesn't do the harm — movement does. Where that petrol is only in your tank, it's a problem of fuel, nothing more. The start of a mechanical problem is a pump that has been labouring on that petrol — and whatever a worn pump sheds travels on with the fuel to the fuel injectors beyond it.
How bad is petrol in a diesel? Four scenarios we see in Lade
Filled up, and not started: no case is better. At a forecourt, and genuinely only there, that petrol is still limited to the tank — because everywhere else your car was driven to reach it. The job is draining and rinsing on the spot.
A moment's running, or merely the ignition on. Petrol has left the tank and reached the filter and the lines, since your system has been bled. That's usually still an easy job — a drain, a flush, and the filter seen to.
The pump has spent a couple of miles on weakened fuel — that is what driving it meant. Tank, lines, filter, then fresh fuel put through the entire system: that's the work, and the way your car was driven matters as much as the distance. Short trips, like the school run to Greatstone Primary School, are one thing. Getting as far as Canterbury, under 25 miles away, makes a very different task — as does any distance on the M20, under 15 miles from Lade, with the engine labouring hard the whole time.
It protested, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone ragged. That is the motor telling you its fuel no longer is acting like diesel. Whether it's the verge on Coast Drive, a lay-by or a side street, stop there and leave it. The drain and flush still go first, and they sort it out: if a car is stopped soon, lasting damage is very unusual.
Petrol in a diesel stories Lade people hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Topping up removes nothing; it gives you a fuller tank of the same mix. That advice assumes a diesel fuel system tolerates petrol by percentage. It does not.
"Modern diesels can handle a little petrol" — a myth, and closer to the opposite. A current diesel sends its fuel through more precise components at higher pressure, which makes the protection count more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that fools motorists. The driver of a petrol engine fed diesel usually has no choice but to stop, because it will not run, and the harm stops with them. Feed petrol to a diesel and it generally starts, ticks over and pulls away like nothing has happened — all while its pump wears. Fine and running aren't the same thing.
Myth: a two-stroke additive lets you to drive home. It was an old workaround, meant for another fault. It doesn't put back what petrol has thinned, and that petrol is still inside the tank after that.
If the motor has been run, part of that petrol sits in your filter and your lines, not the tank — and your next start pulls it right back through the pump. So the myth "drain that tank yourself and you are sorted" does not hold. And, a can of petrol filled at the kerbside is genuinely dangerous.
How petrol ends up: petrol in a diesel
Nobody does it on purpose, and it's seldom carelessness. A diesel nozzle generally won't go into a petrol car, yet the slimmer petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error straightforward, and only in that direction.
The moment routine stops matching the car is the moment it takes place. Hire cars, courtesy cars, and cars that are new to you. Two cars on one driveway, one petrol, one diesel. A forecourt you know, only with its pumps arranged differently. A rushed fill en route to Appledore (Kent) with a train to catch. Years of petrol cars behind you, a diesel Volkswagen Passat in front of you at the forecourt for its first tank — that is when. With rain, a call coming in, or children to deal with, the hand just does what it always has.
Next time you fill up in Lade: preventing petrol in a diesel
- Read the petrol pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on each forecourt. The label is what matters.
- Check your filler flap. Many motors state the fuel type inside the flap or on the cap. Look at it on your first fill in a vehicle you do not know.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of intending to remember, in a household with one of each.
- "Diesel", aloud, before you lift the nozzle — each time a new or hired car needs its first tank. It seems daft. It works.
- While you're thinking about something else, this is an easy mistake to make — so put your phone away.
- Some diesels come with a filler designed to reject a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the petrol pump.
- Stop as soon as you notice. Less petrol inside the tank means a weaker blend. It doesn't change what to do next, which is still not to fire it up.
Put petrol in a diesel in Lade already?
The order of things is brief, then. Leave it unstarted, with the ignition off too. Still on the forecourt, at Usher Motors or anywhere else? Ask the attendants to help you roll the car away from the pump. Next, 0333 366 0103. We'll ask what went in, about how much, and if it has been run.
Say so if it was AdBlue rather than petrol: it's a separate issue, with its own page for Lade, because AdBlue brings corrosion and deposits rather than lost lubrication.
Why one petrol in a diesel task around Lade costs more than another
The four scenarios above are four different jobs, so no single quote for this would be honest. Mostly, the cost shifts with which situation you are in. Beyond that it is the share — how much petrol got in against how much that tank takes — and after that where the vehicle is and whether our van can reach it safely.
What was put in, how much, and if it has run — three questions we ask before quoting, not after, for exactly that reason. With the answers, there is a straight figure instead of a range.
About Lade itself
Lade is a small coastal suburban area in Kent, situated near the Dungeness headland and close to the villages of Greatstone-on-Sea and Lydd-on-Sea. Lade has a low elevation of around 4 metres above sea level, reflecting its coastal setting. Lade is characterized by its semi-detached housing stock, typical of many suburban areas in the South East of England. Lade is located approximately 61 miles from London and 23 miles from the city of Canterbury.
Across Kent and around Lade: fuel drain cover
Petrol in diesel jobs in Lade — part of the TN postcode area — go to vans that likewise cover the locations round it, Greatstone-on-Sea, Lydd-on-Sea and Dungeness included. Our engineers drain where your vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
At the petrol pump in Lade, still?
In that case, you couldn't be in a better spot. Switched off it stays; then ring.