Should You Worry? Petrol in a Diesel Car in Fern Grove
Not started? Then less anxious than you likely are. Until the ignition primes the pump, the starter cranks, or the car is driven, petrol in a diesel tank just waits there and does no harm. Which makes the honest reply to that first Fern Grove question — "have I wrecked it?" — normally no. To keep it that way, ring Petrol in Diesel then leave the engine alone. What petrol really does to a diesel, how to judge how far it's gone, and how to keep it from happening a second time: that is the rest of this page.
What petrol in a diesel does to the motor
Two jobs fall to diesel on its journey round a motor. Before it burns, it protects — then it ignites. Your high-pressure pump and the injectors are built to very fine gaps, and your diesel passing through them is what stops those surfaces from grinding against each other.
Petrol does the first task poorly and the second not at all. It is thinner than diesel and takes away the protection the fuel system hinges on, so a pump running on a petrol blend is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the clattering comes from.
Taken together, they make clear what shape the problem takes. Not contact but movement is what does the damage. All a tank with petrol in it amounts to is a fuel problem. Once the pump has been running on that petrol, a mechanical fault has started: whatever is shed by a pump that's grinding is carried downstream to your injectors with the fuel.
Petrol in a diesel around Fern Grove: how bad is it? Four cases
Filled up, and never started: no case is better. The petrol is inside that tank and only the tank, and the job is a drain and a flush where your car stands. This is the one situation that can only really happen on a forecourt, because anywhere else the vehicle has been driven to get there.
The ignition turned on, or a short start. Petrol has left that tank and got to the filter and the fuel lines, since the system has been primed. Normally nothing more than draining, purging and seeing to the filter, so still simple.
The pump now spent a few miles on thinned fuel — that is what driving it does. The work is the tank, the lines, the filter and fresh fuel through the whole circuit, and how hard the vehicle was driven matters as much as how far. On the school run to Fairfield Community Primary School, the distance is small. Any distance on the M66, under a mile from Fern Grove, means your engine working hard throughout, and a run to Salford, under 10 miles away, is a very different job as well.
Driven on until it complained — clattering, smoke, an uneven idle, a dead throttle. The engine is telling you the fuel is no longer behaving like diesel. Pull up wherever you are — the verge on Rochdale Old Road, a lay-by, a side street — then leave the car there. The fuel drain and flush-through still go first, and they take care of it: if a vehicle is pulled over quickly, lasting damage is very unusual.
Fern Grove motorists and that petrol in a diesel myths they hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Nothing comes out when you top up — that tank simply holds more of the same blend. Percentage isn't how a diesel fuel system copes with petrol, whatever that guidance assumes.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. At higher pressure, through more precise parts: that's how a current diesel moves its fuel, and so the lubrication matters more, not less.
The myth that catches people off guard: if it starts and drives, it must be unharmed. Diesel in a petrol motor generally leaves a motor that will not run: the motorist stops, and so does the damage. A diesel fed petrol normally starts, ticks over and drives away as though nothing has happened, while your pump grinds. Being able to run isn't the same as being fine.
Myth: "Add some two-stroke oil and drive it home." It is an old workaround for a separate fault. The petrol is still inside that tank after that, and whatever it has weakened is not put back.
If the engine has been run, part of that petrol is in the fuel filter and your lines, not the tank — and the next start sends it right back through the pump. So the myth "drain your tank yourself and you're sorted" doesn't hold. Emptying petrol into a can at the roadside is also truly hazardous.
How does petrol in a diesel occur?
Carelessness is rarely the cause, and nobody means to do it. The petrol nozzle is the narrower of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol car at all. The forecourt makes it simple, and the slip runs one way.
Habit and the car getting out of step is how it occurs. Hire cars, courtesy cars, and cars that are new to you. A household with one petrol and one diesel on the driveway. The pumps in a different order on a well-known forecourt. A train to catch, and a hurried fill on the way to Castleton. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it occurs. Add a back seat full of children, a phone call or rain, and habit wins.
How to prevent petrol in a diesel on your next fill-up around Fern Grove
- Check the petrol pump, not the colour. In the UK unleaded handles are generally green and diesel black, but not on each forecourt. The label is what matters.
- Plenty of motors state the fuel inside your filler flap or on the cap, and so check there on your first fill in any motor you don't know.
- Label your key. In a house with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump. It sounds daft and it works.
- Put the phone away. This is an easy mistake to make while you're thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to block a petrol nozzle, and add-on devices exist for the rest. Count it as a backstop, then keep checking the pump.
- The moment you realise, stop: less petrol inside the tank means a weaker mix. What to do next does not change, though — still don't fire it up.
Put petrol in a diesel in Fern Grove already?
In that case, there is just a short order of things. Do not turn the ignition on, and don't crank it. The attendants at the forecourt — whether at EG On the Move itself or wherever you filled up — will usually help roll it away from the petrol pump if you ask. Next, 0333 366 0103. We'll ask what went in, about how much, and if it's been run.
Say so if it was AdBlue instead of petrol: it's a different issue, with its own page for Fern Grove, since AdBlue brings corrosion and deposits rather than lost protection.
What makes one Fern Grove petrol in a diesel job cost more than the next
Four separate jobs sit behind the four scenarios above — which is why there's no fair single quote. What moves the cost is mostly which of them you're in. Two things follow that: the petrol that went in as a proportion of what the tank takes, then the spot your car is in and whether a technician can reach it safely.
That is why we ask three questions before pricing instead of after: what got in, how much, and if it's run. A range turns into a straight figure when the replies are in.
About Fern Grove itself
Fern Grove is a suburban area in Greater Manchester, situated on the riverside at an elevation of 111 metres. Fern Grove lies approximately 8 miles from Salford and is surrounded by other local places such as Topping Fold and Woodgate Hill. Fern Grove has a population of around 6191 people and is characterised by its predominantly semi-detached housing stock. Fern Grove is also relatively distant from London, being around 170 miles away.
Fern Grove and Greater Manchester: where our fuel drain cover reaches
Petrol in diesel call-outs around Fern Grove — part of the BL postcode area — go to teams that also cover the places about it, Topping Fold, Free Town and Woodgate Hill among them. The vehicle does not need to move to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
In Fern Grove and still at the petrol pump?
The best position there is, then — that's where you are. Turned off it remains; then phone.