Lane Side: Petrol in a Diesel Car? How Worried to Be
Not started? Then less anxious than you likely are. Petrol sitting in a diesel tank does nothing to the motor till something draws it through the system — your ignition priming the pump, your starter, or the drive on its own. So the truthful answer to the first query everyone in Lane Side asks, "have I wrecked it?", is usually no. Leave your engine off then call Petrol in Diesel — that is how you keep it that way. Below, you will find what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you a second time.
What petrol in a diesel does to your engine
Passing through a motor, diesel is doing two jobs at the same time. It lubricates to begin with, and after that does it burn. Extremely fine gaps go into your injectors and your high-pressure pump, and just the diesel running through stops their surfaces grinding together.
Of these two tasks, petrol handles the first badly and the second never. A pump running on a petrol mixture is wearing itself out, since petrol is thinner than diesel and strips out the lubrication your fuel system relies on. Petrol is also made to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that is where the rattling comes.
The shape of the issue is clear once you put those together. Not contact but circulation is what causes the harm. Petrol in the tank is a fuel fault. A pump that has been running on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with the fuel to the injectors further on.
How bad is petrol in a diesel? Four scenarios we see in Lane Side
Filled but not once started — the best it gets. The petrol is in your tank and just that tank, and the job is a drain and a flush where your car sits. This is the one scenario that can only truly happen on a forecourt, since anywhere else the car has been driven to get there.
Ignition on, or started for a moment. Once primed, the system has drawn petrol out of that tank up to the fuel filter and the fuel lines. Usually nothing more than clearing, cleaning and sorting the fuel filter, and so still straightforward.
Driven a couple of miles. Now the pump has spent these miles running on weakened fuel. The work is the tank, your lines, the filter and fresh fuel through the whole circuit, and how hard the vehicle was driven matters as much as how far. A school run to Haslingden Primary School is one thing. Any miles on the M66, under 3 miles from Lane Side, means the engine working hard throughout, and a run to Salford, under 25 miles away, is a very different task as well.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone lumpy. What you are hearing is the engine reporting fuel that no longer acts like diesel. Leave it wherever it has stopped: a lay-by, a side street, the verge on St Peters Avenue. A vehicle stopped soon very rarely has lasting damage, because the fuel drain and the flush-through, which still go first, sort it out.
What Lane Side motorists get told about petrol in a diesel — and the stories in it
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing comes out when you top up — that tank simply carries more of the same blend. A diesel fuel system does not accept petrol by percentage in the way that advice presumes.
Myth: a newer diesel copes with a bit of petrol. Rather, the reverse. More precise components and higher pressure are the way a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that fools people. The motorist of a petrol motor fed diesel normally has no choice but to stop, because it will not run, and the damage stops with them. Whilst the pump grinds, a diesel fed petrol normally starts, ticks over and drives away as though nothing has happened. A running engine doesn't mean fine.
Not so: a two-stroke additive lets you to drive home. It is an old workaround, meant for another issue. What petrol has diluted stays weakened, and the petrol stays inside your tank regardless.
Myth: "Drain your tank yourself and you are sorted." Once your engine has run, some of that petrol is no longer inside the tank: it's in your filter and the fuel lines, and it goes right back through the pump at your next start. On top of that, petrol drained into a can by the road is truly risky.
How petrol ends up: petrol in a diesel
On purpose? Never. Through carelessness? Rarely, if ever. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol motor at all. The forecourt makes it simple, and the mistake runs one way.
It takes place when habit and the car stop matching. Hire cars, courtesy cars, and cars that are new to you. A household with one petrol and one diesel on the drive. Your ordinary forecourt, its pumps suddenly in a different order. A train to catch, and a hurried fill en route to Accrington. Exactly the moment it takes place: after years of driving petrol, someone fills a diesel Volkswagen Passat for the first time. Throw in a back seat full of kids, a phone call or rain, and habit wins.
Avoiding petrol in a diesel next time you fill up around Lane Side
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Read the petrol pump's label; the colour is only a hint.
- In a vehicle you don't know, look inside the flap over your filler or at the cap before the first fill: many cars state the fuel there.
- Mark your key. In a home with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- Before the nozzle leaves the pump the first time you fuel a hired or new motor, say "diesel" aloud. Silly, yes, yet it does the trick.
- While you're thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Some diesels come with a filler designed to reject a petrol nozzle, and devices you can add are available for motors without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the petrol pump.
- As soon as you realise, stop: less petrol in your tank means a thinner blend. What to do next doesn't change, though — still do not fire it up.
Petrol already in a diesel in Lane Side? Begin here
Short and simple, then, is the order of things. Leave it unstarted, with the ignition switched off too. Still on the forecourt, at Texaco or anywhere else? Ask the staff to help you roll the vehicle away from the petrol pump. Ring 0333 366 0103 next, with three answers — your fuel, the rough quantity, and if it has run.
Corrosion and deposits are the trouble with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and see its own Lane Side page.
Why one petrol in a diesel job around Lane Side costs more than another
The four situations above are four different jobs, so no single price for this would be honest. The scenario itself does most of the work of moving your cost. Two things come after that: the petrol that was put in as a proportion of what your tank takes, then the place the car is in and whether our van can reach it safely.
What got in, how much, and if it has run — three questions we ask before quoting, not after, for precisely that reason. The answers change a range into a straight figure.
About Lane Side and where it is
Lane Side is a suburban area in Lancashire, situated on the riverside with nearby settlements including Longshoot and Haslingden. Lane Side has a mix of housing types, but is predominantly characterised by terraced homes. Lane Side sits at an elevation of 246 metres, relatively high compared to the surrounding areas, and is located near Well Bank. Lane Side is approximately 15 miles from Salford, making it a commuter base for the city.
Fuel drain cover in Lane Side and across Lancashire
The teams answering petrol in diesel calls around Lane Side, in the BB postcode area, equally work the places around it, Longshoot, Haslingden and Well Bank among them. No need to move your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places we drain.
At the pump in Lane Side, right now?
No position is better: that is where you now are. Switched off it remains; then call.