How Worried Should You Be? Petrol in a Diesel Car in Penshaw
Likely less than you are now — as long as no one has started the vehicle. Petrol sitting in a diesel tank does nothing to your engine till something draws it through the system — your ignition priming the pump, the starter, or driving on its own. So the fair answer to the first query everyone around Penshaw asks, "have I ruined it?", is generally no. Petrol in Diesel is who to phone, with the motor left off, so it stays that way. The rest of this page explains what petrol really does to a diesel, how to tell how far it has got, and how to make sure it doesn't happen to you a second time.
Petrol in a diesel: what does it do to the engine?
Passing through a motor, diesel does two things at once. It protects to begin with, and only then does it burn. The high-pressure pump and the fuel injectors are built to very fine clearances, and your diesel passing through them is what stops those surfaces from grinding against one another.
The second task petrol doesn't do at all, and the first it does badly. 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 protection the system hinges on, and any pump running on such a mix is wearing itself.
Combined, those leave the shape of the problem clear. The harm is done by movement, not by contact. A tank with petrol in it is a fuel problem. Whatever a worn pump sheds travels on, carried by your fuel, into the injectors further along, which is why a pump that has worked on that petrol is where a mechanical problem starts.
Four scenarios our engineers see in Penshaw: how serious is petrol in a diesel?
The best case there can be: filled up, not once started. Being at a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With the petrol kept inside that tank alone, it's cleared and cleaned on the spot, and nothing more is needed.
The ignition switched on, or a brief start. With the fuel system primed, the fuel lines and filter now contain petrol that came from that tank. Usually nothing more than clearing, purging and sorting the filter, so still easy.
Those few miles on the road were the pump running on fuel weakened by petrol the whole way. Tank, lines, filter, then clean fuel run through the entire circuit: that is the work, and the way the car was driven counts as much as the mileage. On the school run to Our Lady Queen of Peace Catholic Primary School, Penshaw, the mileage is small. Very different again: a run to Sunderland, under 10 miles away, or some mileage on the Western Highway, under 3 miles from Penshaw, where your engine never stopped labouring hard.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone lumpy. That's your engine telling you its fuel has stopped acting like diesel. Stop where you are — on the verge on Wensleydale Avenue, 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 long-term damage very uncommon when a vehicle is pulled over quickly.
Penshaw motorists and the petrol in a diesel myths they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing is removed when you top up — that tank just holds more of the same mixture. Percentage isn't how a diesel fuel system tolerates petrol, however much that advice presumes.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the reverse. Protection counts more on modern diesels, not less, because their fuel passes through finer parts at higher pressure.
"It starts, it drives, and so no harm done" — the myth that trips up most people than any other. Feed diesel to a petrol motor and it usually will not run, and so the driver stops — and the damage stops with them. While the pump grinds, a diesel fed petrol normally starts, ticks over and drives away as though nothing has happened. Being able to run isn't proof of being fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an outdated workaround for a separate fault. What petrol has diluted stays diluted, and the petrol stays in the tank regardless.
Once your engine has run, part of that petrol sits in your filter and your lines, not the tank — and your next start sends it straight back through the pump. So the myth "drain the tank yourself and you're sorted" does not stand up. Besides, petrol emptied into a can by the road is genuinely risky.
Why petrol in a diesel occurs at all
On purpose? Never. Through carelessness? Rarely, if ever. One way only, because of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, while the diesel one mostly won't fit a petrol motor. That's how the forecourt makes it simple.
Routine and the car getting out of step is when it takes place. Courtesy car, hire car, or a car that is brand new. One petrol and one diesel on the drive of the same household. Your usual forecourt, its pumps suddenly in a different order. A train to catch, and a hurried fill en route to Chester-Le-Street. Years of petrol vehicles behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that is when. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
Next time you fill up around Penshaw: preventing petrol in a diesel
- The label is what matters, and so check the petrol pump instead of the colour: in the UK unleaded handles are normally green and diesel black, yet not on every forecourt.
- The first fill in a strange car is the time to check the filler flap — on it, or on the cap, plenty of vehicles state which fuel they take.
- A coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember, for a home with one of each.
- It sounds silly and it works: on the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away then keep your mind on the pump.
- 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 motors without one. They are a backstop, not a reason to stop checking the petrol pump.
- Less petrol means a weaker mix, and so stop the moment you notice — while remembering that your next stage is unchanged. It's still not to start the car.
Already put petrol in a diesel around Penshaw?
The order of things is brief, then. Do not switch your ignition on, and don't fire it up. Still at the forecourt, at Gulf or anywhere else? Ask the attendants to help you roll the car away from the pump. Next, 0333 366 0103. We will ask what was put in, roughly how much, and if it's been run.
If it was AdBlue rather than petrol, say so. That's a separate issue — corrosion and deposits and not lost lubrication — and it has its own page for Penshaw.
One petrol in a diesel job in Penshaw costs more than another. Why?
The four scenarios above are four different tasks, so no single price for this would be fair. Which of them you are in is mostly what shifts the cost. Two things follow that: the petrol that went in as a share of what your tank takes, then the spot the car is in and whether our van can get to it safely.
That's why our technicians ask three questions before quoting instead of after: what got in, how much, and if it has run. Those answers turn a range into a straight figure.
About Penshaw itself
Penshaw is a village situated on the banks of the River Wear in Tyne and Wear, with a mix of semi-detached housing and local amenities. Penshaw lies close to the city of Sunderland, approximately 5 miles to the north, and is near other local communities such as Shiney Row and Fatfield. Penshaw has a relatively low elevation of around 44 metres above sea level, reflecting its riverside setting. Penshaw is home to around 2259 residents, according to recent estimates.
Fuel drain cover across Tyne and Wear, Penshaw included
Our vans answering petrol in diesel jobs in Penshaw, in the DH postcode area, equally work the places around it, Shiney Row, Mount Pleasant and Fatfield included. You need not bring your car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places we drain.
Still at the petrol pump in Penshaw?
Then you are in the best position there is. Keep it off. Phone.