Should You Worry? Petrol in a Diesel Car in Chatburn
Provided it has not been started, you can worry far less than you likely are. Till your ignition primes the pump, the starter turns, or the car is driven, petrol in a diesel tank just sits there and does no harm. Which makes the truthful reply to the first Chatburn question — "have I wrecked it?" — usually no. To leave it like that, ring Petrol in Diesel and leave your engine alone. Read on for three things: the effect petrol has inside a diesel engine, the signs of how far it has got, and the way to make sure you never repeat it.
The motor and petrol in a diesel: what goes on
Passing through a motor, diesel is doing two jobs at the same time. It lubricates to begin with, and only then does it burn. What stops the surfaces inside your high-pressure pump and your injectors from wearing down against one another is your diesel flowing through them — they're designed to extremely fine tolerances.
Poorly at the first, not at all at the second: that is petrol. A pump running on a petrol mixture is wearing itself out, because petrol is runnier than diesel and strips out the protection your fuel system depends on. Petrol is also made to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that is where the clattering starts.
Seen together, they make clear the shape the problem takes. It is movement that causes the harm, not contact. A tank with petrol in it is a fuel issue. After your pump has been working on that petrol, a mechanical fault has begun: whatever is shed by a pump that is wearing down travels downstream to your injectors with your fuel.
Chatburn, petrol in a diesel: four situations, from mild to serious
Filled up, not once started. The best case there is. Being at a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With that petrol held inside that tank alone, it's emptied and flushed right where it stands, and nothing more is needed.
Ignition on, or started for a moment. Petrol has come out of that tank and got to your filter and the fuel lines, because the fuel system has been bled. Still usually easy: drain, flush, and the fuel filter sorted.
The pump has worked a couple of miles on weakened fuel — that is what driving it does. Tank, lines, filter, then fresh fuel put through the entire circuit: that is this work, and the way the vehicle was driven matters as much as the mileage. On the school run to Chatburn Church of England Primary School, the miles is small. Very different again: a trip to Preston, under 25 miles away, or some distance on the M65, under 10 miles from Chatburn, where the motor kept running hard.
Knocking, a ragged idle, smoke, a throttle gone soft: driven till it complained. The engine is telling you the fuel is no longer acting like diesel. Pull up on the spot — on the verge on Bridge Road, at the kerb, down a side road — and don't move it. What comes first is still the drain and flush-through, and that deals with it, with permanent damage very unusual when a vehicle is stopped early.
Stories Chatburn motorists hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." A fuller tank of the same mix is all you get, since topping up removes nothing. A diesel fuel system doesn't tolerate petrol by percentage in the way that advice presumes.
"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 handles its fuel, and so the protection counts more, not less.
The myth that catches motorists out: if it starts and drives, it must be unharmed. A petrol engine fed diesel usually won't run, so the motorist stops and the harm stops with them. Feed petrol to a diesel and it normally starts, idles and drives away like nothing happened — all the while its pump wears. Being able to run isn't proof of being fine.
Myth: "Add some two-stroke oil and drive it home." It is an outdated workaround for a different fault. It doesn't put back what petrol has thinned, and that petrol is still inside that tank afterwards.
Myth: "Drain your tank yourself and you are sorted." After your engine has run, some of the petrol is no longer in your tank: it is in your filter and the lines, and it goes straight back through the pump at the next start. And, a can of petrol drained by the roadside is truly hazardous.
How it happens: petrol in a diesel
No one does it on purpose, and it is rarely carelessness. A diesel nozzle generally won't fit a petrol motor, but 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 your car is the moment it occurs. Any car that is new to you — a hire car, on loan as a courtesy car, or brand new. A household with one petrol and one diesel on the driveway. A forecourt you know, but with its pumps arranged differently. A rushed fill en route to Clitheroe with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: precisely when it occurs. Add rain, a phone call or a back seat full of kids, and your hand does what it has always done.
Next time you fill up in Chatburn: preventing petrol in a diesel
- Green for unleaded and black for diesel is normal in the UK — yet not on each forecourt. Go by the label on the pump, not the colour.
- The first fill in a strange car is the time to check your filler flap — inside it, or on the cap, many cars state the fuel they take.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of meaning to remember, in a household with one of each.
- It seems silly and it works: on your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump.
- Whilst you're thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to reject a petrol nozzle, and add-on devices exist for the remainder. Treat it as a safety net, then keep checking the pump.
- As soon as you notice, stop: less petrol in your tank makes a thinner mixture. What to do next doesn't change, though — still do not crank it.
Chatburn: already put petrol in a diesel?
Then the order of things is short. Starting it is out, and so is switching on the ignition. Yet on the forecourt, at Certas Energy or anywhere else? Ask the attendants to help you push it clear of the petrol pump. Then ring 0333 366 0103 and tell us what went in, about how much, and if it's run.
Corrosion and deposits are the problem with AdBlue, whereas petrol means lost protection. So if it was AdBlue, say so — and read its own Chatburn page.
What makes one Chatburn petrol in a diesel task cost more than the next
Four separate tasks sit behind the four scenarios above — which is why there is no fair single quote. Chiefly, the cost moves with which one you are in. Next it is the ratio — how much petrol was put in against how much the tank holds — and then where the vehicle is and whether a van can get to it safely.
Three queries come first, before quoting, instead of after — what was put in, how much, has it run — and this is the reason. With the answers, there is a straight figure rather than a range.
About Chatburn itself
Chatburn is a village in Lancashire, situated on the banks of a river at an elevation of 96 metres. Chatburn lies near the villages of Worston, Grindleton, and Downham, and is approximately 16.7 miles from Preston. Chatburn has a population of around 1125 people, with a predominance of terraced housing. Chatburn is located in the North West region of England, about 189.3 miles from London.
Fuel drain cover across Lancashire, Chatburn included
Worston, Grindleton and Downham are among the spots around Chatburn that the same teams work, answering petrol in diesel call-outs across Chatburn's BB postcode area. You need not move your car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places we drain.
Chatburn: still at the petrol pump?
The best position there is, then — that's where you are. Keep it off. Call.