Should You Worry? Petrol in a Diesel Car in Moss Pit
Provided it has not been started, you can worry less than you probably are. Everyone around Moss Pit starts with "have I ruined it?", and the honest answer is usually no: petrol left inside the tank of a diesel stays harmless till priming, cranking or driving pulls it into your fuel system. Leave the motor off and phone Petrol in Diesel — that keeps it like that. Read on for three things: the effect petrol has inside a diesel motor, the signs of how far it has spread, and the way to make sure you don't repeat it.
What petrol in a diesel does to your engine
Diesel does two jobs on its way through a motor. It protects to begin with, and after that does it burn. Made to very fine tolerances, the injectors and your pump rely on the diesel flowing through them to keep their surfaces from wearing against one another.
Badly at the first, not at all at the second: that's petrol. It's thinner than diesel and removes the lubrication your fuel system depends on, so a pump running on a petrol mix is a pump wearing itself. And petrol is made to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That's where the knocking comes from.
Seen together, they make clear what shape the problem has. Contact doesn't do the harm — movement does. Any tank with petrol in it is a fuel problem. The start of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds moves on with your fuel to the fuel injectors downstream.
Moss Pit, petrol in a diesel: four situations, from mild to major
The best case there is: filled up, never started. Only that tank has petrol in it, so the task is emptying the tank and purging the system where your car sits. This scenario can only really occur at a forecourt: anywhere else, the vehicle got there by being driven.
A moment's running, or just the ignition on. With the fuel system primed, the fuel lines and filter already contain petrol that has come from your tank. That is normally still a simple task — a drain, a flush, and your filter dealt with.
Your pump now spent a couple of miles on weakened fuel — that's what driving it does. Tank, lines, filter, then clean fuel put through the whole circuit: that's the work, and the way your car was driven matters as much as the distance. Driving the kids to Burton Manor Primary School is one sort of trip. Very different once more: a run to Wolverhampton, under 15 miles away, or some miles on the M6, under a mile from Moss Pit, where your engine never stopped labouring hard.
Driven on till it complained — knocking, smoke, a lumpy idle, a soft throttle. What you are hearing is the engine signalling fuel that no longer acts like diesel. Pull up where you are — on the verge on Garth Close, at the kerb, down a side road — and do not move it. What goes first is still the drain and flush, and that deals with it, with lasting damage very uncommon if a car is stopped soon.
Petrol in a diesel myths Moss Pit people hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Topping up removes nothing; it gives you a bigger tank of the same mixture. That guidance supposes a diesel fuel system handles petrol by percentage. It doesn't.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. A current diesel runs its fuel through more precise components at higher pressure, which makes the protection matter more, not less.
This is the one that fools people. Myth: "If it starts and drives, there's no harm done." Feed diesel to a petrol engine and it usually will not run, and so the driver stops — and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile your pump grinds. Being able to run isn't proof of being fine.
Myth: a two-stroke additive lets you to drive home. It was an old fix, meant for another problem. What petrol has thinned remains thinned, and the petrol stays in that tank anyway.
Myth: "Drain that tank yourself and you are sorted." After your engine has been run, some of that petrol is no longer in that tank: it is in the fuel filter and the fuel lines, and it goes straight back through the pump on your next start. Emptying petrol into a can by the roadside is also really risky.
Why petrol in a diesel occurs at all
Carelessness is rarely the cause, and nobody means to do it. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle mostly won't go into a petrol vehicle at all. So the slip runs one way.
The moment habit stops matching your car is the moment it takes place. Hire cars, courtesy cars, and vehicles that are new to you. Two motors on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A train to catch, and a rushed fill on the way to Stafford. Exactly the moment it takes place: after years of driving petrol, a driver fills a diesel Renault Megane for the first time. With rain, a call coming in, or a car full of children to deal with, your hand simply does what it has always done.
Next time you fill up around Moss Pit: avoiding petrol in a diesel
- A green handle for unleaded and black for diesel is normal in the UK — yet not on each forecourt. Trust the label on the pump, not the colour.
- Many vehicles state the fuel inside your filler flap or on the cap, so check it on the first fill in a vehicle you don't know.
- Label your key. In a home with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- "Diesel", out loud, before you lift the nozzle — every time a new or hired car gets its first tank. It seems silly. It does the trick.
- Tuck your phone away. This is an easy mistake to make whilst you are thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to block a petrol nozzle, and add-on devices exist for cars without one. They are a safety net, not a reason to stop checking the petrol pump.
- Spotting it mid-fill? Stop there and then. A weaker mix follows from less petrol in that tank, but the next stage stays the same: don't fire it up.
Put petrol in a diesel around Moss Pit already?
Then the order of things is short. Starting it is out, and so is turning on your ignition. Yet at the forecourt, at Esso or anywhere else? Ask the staff to help you roll it clear of the pump. Next, 0333 366 0103. We'll ask what got in, about how much, and if it has been run.
If it was AdBlue rather than petrol, say so. That's a separate fault — corrosion and deposits and not lost lubrication — and it has its own page for Moss Pit.
What makes one Moss Pit petrol in a diesel task cost more than the next
An honest single price doesn't exist here: four situations, four separate tasks. Chiefly, your cost moves with which situation you are in. Beyond that it's the share — how much petrol went in against how much the tank takes — and after that where the car is and whether a technician can get to it safely.
What went in, how much, and if it's run — three questions our engineers ask before costing, not after, for exactly that reason. Given the replies, you get a straight figure rather than a range.
About Moss Pit itself
Moss Pit is a suburban area in Staffordshire, situated inland at an elevation of 94 metres, with semi-detached housing being the predominant type of accommodation. Moss Pit lies approximately 13 miles from Wolverhampton and is surrounded by nearby places such as Rickerscote and Rising Brook. Moss Pit is part of the wider West Midlands region, with London being around 122 miles to the southeast. Moss Pit has a population of around 4256 residents.
Fuel drain cover around Moss Pit and across Staffordshire
Moss Pit rests in the ST postcode area, and our vans that answer petrol in diesel call-outs there work the places around it as well — Rickerscote, Rising Brook and Burton Manor among them. No need to bring the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places where we work.
At the petrol pump in Moss Pit, still?
Then you're in the best position there can be. Call, and leave it switched off.