How Worried Should You Be? Petrol in a Diesel Car in St Augustines
Far less than you probably are, provided it has not been started. Petrol sitting in a diesel tank does nothing to the engine until something pulls it through your fuel system — your ignition priming the pump, the starter, or driving on its own. So the truthful answer to the first query everyone in St Augustines asks, "have I wrecked it?", is normally no. Keep it like that: leave the engine off and call Petrol in Diesel. Read on for three things: the effect petrol has inside a diesel motor, the signs of how far it has spread, and ways to make sure you don't repeat it.
Inside your engine: what petrol in a diesel really does
Two jobs fall to diesel on its route round a motor. Before it combusts, it lubricates — and then it ignites. What keeps the surfaces inside the high-pressure pump and the injectors from wearing against one another is your diesel passing through them — they are made to very fine gaps.
Of these two jobs, petrol handles the first poorly and the second not at all. A pump working on a petrol blend is wearing itself out, since petrol is runnier than diesel and strips out the protection the fuel system depends on. Petrol is also made to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that is where any clattering comes.
The shape of the problem is plain when you put those together. The harm is done by circulation, not by contact. Any tank with petrol in it is a fuel problem. The start of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds moves on with the fuel to your injectors downstream.
Four scenarios our engineers see in St Augustines: how serious is petrol in a diesel?
Filled up, never started. The best case there can be. That petrol is inside your tank and just that tank, and the job is a drain and a flush where your car stands. This is the one scenario that can only really occur at a forecourt, since anywhere else the vehicle has been driven to get there.
Ignition on, or started for a moment. Petrol has left the tank and reached your filter and your lines, because your system has been bled. That's generally still a straightforward task — a drain, a flush, and the fuel filter seen to.
A few miles driven, and the pump has spent every one of them working on diluted fuel. The work is that tank, the lines, the fuel filter and fresh fuel through the entire circuit, and how hard your car was driven matters as much as how far. On the school run to Spire Junior School, the mileage is small. A run as far as Sheffield, under 15 miles away, is a very different job. So is any miles on the M1, under 5 miles from St Augustines, where the motor has been running hard throughout.
Driven on till it protested — clattering, smoke, an uneven idle, a dead throttle. That's the engine telling you its fuel has stopped acting like diesel. Leave it where it stops: a lay-by, a side street, the verge on Dundonald Road. A car stopped early very seldom has permanent damage, as the drain and the flush-through, which still come first, take care of it.
Myths St Augustines drivers hear about petrol in a diesel
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. Topping up takes out nothing; it gives you a bigger tank of the same mixture. That guidance presumes a diesel fuel system handles petrol by percentage. It does not.
"Current diesels can handle a little petrol" — a myth, and nearer the opposite. At higher pressure, through smaller parts: that is how a modern diesel handles its fuel, and so the protection counts more, not less.
Myth: "If it starts and drives, there's no harm done." This is the one that catches motorists. A petrol engine fed diesel generally will not run, and so the driver stops and the damage stops with them. Feed petrol to a diesel and it usually fires up, idles and pulls away as if nothing has happened — all while its pump wears. Running is not the same as fine.
Not so: a two-stroke additive lets you to drive home. It was an old workaround, meant for another problem. None of what petrol thinned gets put back by it — and afterwards, that tank still holds that petrol.
Once the engine has run, part of the petrol is in the filter and the fuel lines, not the tank — and the next start pulls it straight back through the pump. So the myth "drain the tank yourself and you are sorted" does not stand up. It's also genuinely hazardous to drain petrol into a can at the kerbside.
Why petrol in a diesel occurs so easily
On purpose? Never. Through carelessness? Seldom, if ever. One way only, because of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly won't fit a petrol car. That's how the forecourt makes it easy.
Routine and the car getting out of step is how it happens. Courtesy car, hire car, or a car that's brand new. Two vehicles on one drive, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A hurried fill en route to Chesterfield with a train to catch. Precisely the moment it happens: after years of driving petrol, a driver fills a diesel Renault Megane 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 St Augustines
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most usually do. Read the petrol pump's label; the colour is just a clue.
- The first fill in an unfamiliar vehicle is the time to check the filler flap — on it, or on the cap, many motors state the fuel they take.
- Good intentions count for less than a sticker or a fob in a bright colour on the diesel's key if a house has one of each. So label it.
- Before the nozzle comes off the petrol pump the first time you fuel a hired or new car, say "diesel" out loud. Daft, yes, yet it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck your phone away and keep your mind on the pump.
- Add-on devices exist for motors without one, and some diesels are built with a filler that will not take a petrol nozzle. Useful — but a safety net at best, never a reason to stop checking the label.
- Spotting it mid-fill? Stop at once. A weaker mixture follows from less petrol inside your tank, yet the next stage remains the same: do not crank it.
Put petrol in a diesel around St Augustines already?
In that case, there is only a short order of things. Do not fire it up, and do not switch your ignition on. The attendants on the forecourt — whether at Chesterfield Autogas Ltd itself or wherever you filled up — will normally help push it away from the petrol pump if you ask. Next, 0333 366 0103. We'll ask what got in, about how much, and if it has been run.
Corrosion and deposits are the problem with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and see its own St Augustines page.
One petrol in a diesel job around St Augustines costs more than another. Why?
There is no fair single price for this, since the four situations above are four different tasks. What moves your cost is chiefly which of them you're in. The share counts next, meaning how much of that tank is petrol, and then the position of the car and whether reaching it is safe for a technician.
That's why our technicians ask three questions before quoting instead of after: what got in, how much, and if it's run. Those replies change a range into a straight figure.
About St Augustines and where it is
St Augustines is a suburban area in Derbyshire, situated on the riverside at an elevation of 82 metres, with semi-detached housing being the predominant type of accommodation. St Augustines is located near several other places, including Boythorpe, Spital, and Birdholme, and is approximately 10.9 miles from Sheffield. St Augustines has a population of around 6036 people and is part of the wider urban area surrounding Sheffield. St Augustines is also relatively close to the national motorway network, with London being around 130.8 miles away.
Fuel drain cover around St Augustines and across Derbyshire
Boythorpe, Spital and Birdholme are among the places around St Augustines that the same vans work, answering petrol in diesel call-outs across St Augustines's S postcode area. A forecourt, a supermarket car park, a lay-by or your own drive are all places our technicians drain, and the car does not need to come to us.
St Augustines: still at the pump?
Then, you could not be in a better spot. Leave the vehicle switched off, and ring.