Breedy Butts: Petrol in a Diesel Car? How Worried to Be
Likely less than you are now — provided nobody has started the vehicle. Till your ignition primes your pump, your starter cranks, or the vehicle is driven, petrol in a diesel tank simply sits there and does nothing. Which makes the truthful reply to the first Breedy Butts question — "have I wrecked it?" — usually no. Keep it that way: leave the engine off then call Petrol in Diesel. Below, you will find what petrol really does inside a diesel, how far it may have got, and how to stop it happening to you a second time.
Inside the engine: what petrol in a diesel really does
Diesel has two jobs on its way through a motor. Oiling comes before burning; it does both. The high-pressure fuel pump and the injectors are made to very fine clearances, and your diesel passing through them is what stops those surfaces from wearing down against one another.
Petrol handles the first job poorly and the second not at all. The rattling comes from petrol being designed not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips out the lubrication the system rests on, and any pump running on such a mix is wearing itself.
Combined, those leave the shape of the trouble clear. It is circulation that does the damage, not contact. All a tank with petrol in it amounts to is a fuel problem. Whatever a worn pump sheds goes on, borne by the fuel, into the fuel injectors further along, which is why a pump that has worked on that petrol is where a mechanical fault starts.
Breedy Butts, petrol in a diesel: four situations, from mild to significant
Filled up, and never started: nothing beats it. That petrol is in that tank and only that tank, and the job is a drain and a flush where the car stands. This is the one scenario that can only really take place at a forecourt, because anywhere else your car has been driven to get there.
Started for a second, or just your ignition on. Once primed, the fuel system has pulled petrol out of your tank up to the fuel filter and the fuel lines. Normally nothing more than draining, rinsing and sorting the filter, and so still simple.
Those few miles on the road were the pump running on fuel weakened by petrol the whole way. Distance is only half of it; how hard it was driven matters just as much. Either way the work runs to the tank, the fuel lines, your filter and clean fuel through the entire circuit. On the school run to Carleton Green Community Primary School, the miles is short. A run as far as Preston, under 15 miles away, is a very different job. So is any mileage on the M55, under 5 miles from Breedy Butts, where the engine has been labouring hard the whole time.
Driven on till it complained — knocking, smoke, an uneven idle, a soft throttle. The motor is telling you your fuel is no longer acting like diesel. Leave it wherever it stops: a lay-by, a side street, the verge on Harewood Close. The fuel drain and flush-through still come first, and they deal with it: if a car is pulled over quickly, permanent damage is very rare.
Petrol in a diesel stories Breedy Butts motorists hear
False: topping up to full with diesel makes it fine. It does not. Topping up takes out nothing; it gives you a fuller tank of the same mixture. The idea behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: a current diesel copes with a bit of petrol. If anything, the opposite. A modern diesel runs its fuel through finer parts at higher pressure, which makes the lubrication matter more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that catches drivers. Any petrol motor fed diesel usually will not run, so the motorist stops and the damage stops with them. Feed petrol to a diesel and it normally starts, ticks over and drives away like nothing happened — all while its pump is wearing. Being able to run is not the same as being fine.
Myth: "Add some two-stroke oil and drive the car home." It's an old fix for a separate issue. It does not put back what petrol has weakened, and the petrol is still in that tank afterwards.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol lies in your filter and lines, waiting to go straight back through the pump at your next start. Besides, petrol cleared into a can by the road is genuinely dangerous.
Why petrol in a diesel happens at all
It's seldom carelessness, and no one does it on purpose. A diesel nozzle mostly won't fit a petrol motor, but the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake simple, and only in that direction.
When habit and the vehicle stop matching, it happens. A car that's new to you — a hire car, on loan as a courtesy car, or brand new. Two cars on one driveway, one petrol, one diesel. The pumps in a different order on a familiar forecourt. Filling up in a rush on the way to Poulton-Le-Fylde, with a train to catch. Precisely the moment it takes place: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Add rain, a phone call or a back seat full of kids, and your hand does what it has always done.
Avoiding petrol in a diesel next time you fill up around Breedy Butts
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Check the petrol pump's label; the colour is just a hint.
- Inspect your filler flap. Plenty of cars state the fuel type inside the flap or on the cap. Look at it on the first fill in a vehicle you do not know.
- A coloured fob or a sticker on your diesel's key does more than any amount of intending to remember, in a house with one of each.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump. It sounds silly and it works.
- Put the phone away. This is an easy mistake to make while you're thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject a petrol nozzle, and add-on devices are available for cars without one. They are a backstop, not a reason to stop reading the petrol pump.
- Less petrol means a thinner mixture, so stop as soon as you notice — though remembering that your next step is unchanged. It's still not to start it.
Already put petrol in a diesel around Breedy Butts?
Then, there's just a short order of things. Don't turn the ignition on, and do not start it. Yet on the forecourt, at Applegreen or anywhere else? Ask the staff to help you roll it clear of the pump. Next, 0333 366 0103. We will ask what got in, roughly how much, and if it's been run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a different fault — Breedy Butts has a page all for it.
What makes one Breedy Butts petrol in a diesel task cost more than the next
Four separate jobs lie behind the four situations above — which is why there's no honest single quote. Which of them you're in is mostly what shifts your cost. The ratio matters next, meaning how much of that tank is petrol, followed by the position of the vehicle and whether reaching it is safe for a technician.
That's why we ask three queries before pricing instead of after: what got in, how much, and whether it has run. Those answers are what turn a range into one firm number.
About Breedy Butts itself
Breedy Butts is a coastal locality in Lancashire, situated near the towns of Carleton and Poulton-le-Fylde. Breedy Butts lies at a low elevation of around 6 metres, close to the shore. Breedy Butts is characterised by its predominantly detached housing stock, reflecting its residential nature. Breedy Butts is located approximately 13.9 miles from Preston, the nearest city.
Across Lancashire and around Breedy Butts: fuel drain cover
Petrol in diesel call-outs in Breedy Butts — part of the FY postcode area — go to teams that likewise cover the places round it, Carleton, Skippool and Poulton-le-Fylde among them. The car doesn't need to come to us: we drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
Breedy Butts: still at the pump?
Then you are in the best place there can be. Turned off it stays; then call.