How Worried Should You Be? Petrol in a Diesel Car in Edgeside
Unstarted? Then less worried than you likely feel. Till 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 means the truthful reply to the first Edgeside query — "have I ruined it?" — normally no. Leave your motor off then call Petrol in Diesel — that is how you keep it like that. What petrol actually does to a diesel, how to gauge how far it's gone, and how to keep it from happening again: that's the rest of this page.
Inside the motor: what petrol in a diesel really does
Two tasks fall to diesel on its route through a motor. It protects to begin with, and after that does it burn. What stops the surfaces inside your high-pressure pump and your injectors from wearing down against one another is your diesel flowing through them — they're designed to extremely fine tolerances.
Of these two jobs, petrol manages the first poorly and the second not at all. Being less viscous than diesel, petrol strips away the protection a fuel system needs, leaving a pump on that mixture wearing itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is why you hear the knocking.
Taken together, they make clear what shape the trouble takes. The damage is done by movement, not by contact. All a tank with petrol in it amounts to is a fuel problem. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with the fuel to the fuel injectors further on.
Four situations our technicians see in Edgeside: how serious is petrol in a diesel?
The best case there can be: filled up, not once started. Being on a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With that petrol held inside the tank alone, it's cleared and cleaned on the spot, and nothing more is needed.
Ignition on, or started for a second. Petrol has come out of your tank and reached the fuel filter and the lines, because your system has been primed. Still generally straightforward: drain, flush, and the fuel filter dealt with.
A few miles driven, and the pump has spent every one of them running on weakened fuel. The work is that tank, the lines, the fuel filter and fresh fuel through the whole circuit, and how hard the vehicle was driven counts as much as how far. Driving the kids to St Anne's Church of England Primary School is one sort of trip. Any distance on the M66, under 5 miles from Edgeside, means the engine working hard throughout, and a run to Manchester, under 25 miles away, makes a very different task too.
Clattering, an uneven idle, smoke, a throttle gone soft: driven until it complained. That's the motor telling you its fuel has stopped acting like diesel. Stop where you are — on the verge on Fearns Moss, at the kerb, down a side road — and don't move it again. What comes first is still the fuel drain and flush-through, and that deals with it, with lasting damage very uncommon if a car is stopped soon.
Stories Edgeside people hear about petrol in a diesel
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing is removed by topping up — you're left with a bigger tank, still the same mix. That guidance supposes a diesel fuel system tolerates petrol by percentage. It doesn't.
Not so: a current diesel copes with a bit of petrol. Rather, the reverse. A current diesel sends its fuel through finer components at higher pressure, which makes the protection count more, not less.
"It starts, it drives, and so no harm done" — the myth that catches more motorists than any other. Feed diesel to a petrol motor and it generally won't run, and so the driver stops — and the harm stops with them. Feed petrol to a diesel and it generally fires up, idles and drives away like nothing has happened — all the while its pump wears. Running isn't the same as fine.
Myth: a two-stroke additive makes it safe to drive home. It was an old workaround, supposed for another problem. It does not put back what petrol has diluted, and the petrol is still in your tank later on.
The next start draws petrol back round the pump from your lines and your filter, where some of that ends up once the motor has been run. That's why draining the tank yourself does not sort it — a myth. And, a can of petrol drained at the kerbside is genuinely dangerous.
How does petrol in a diesel happen?
Carelessness is seldom the cause, and no one means to do it. A diesel nozzle mostly won't go into a petrol car, yet the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error simple, and just in one direction.
The moment routine stops matching your car is the moment it takes place. Any vehicle that is new to you — hired, on loan as a courtesy car, or just bought. A household with one petrol and one diesel on the driveway. Your ordinary forecourt, its pumps suddenly in a different order. Fuelling up in a rush en route to Walsden, with a train to catch. Precisely the moment it takes place: after years of driving petrol, a driver fills a diesel Volkswagen Passat for the first time. Throw in rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
Edgeside people: how to prevent petrol in a diesel next time
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Read the petrol pump's label; the colour is just a hint.
- Check your filler flap. Plenty of motors state the fuel inside the flap or on the cap. Look at it on your first fill in any car you don't know.
- Label the 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.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump. It sounds silly and it works.
- Thinking about something else is when this becomes an easy mistake to make, so put your phone away then keep your mind on the pump.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to block a petrol nozzle, and add-on devices exist for cars without one. They are a backstop, not a reason to stop checking the pump.
- Spotting it halfway? Stop there and then. A weaker mix follows from less petrol in that tank, yet the next step remains the same: do not fire it up.
Already put petrol in a diesel in Edgeside?
The order of things is short, then. Starting it is out, and so is switching on your ignition. Yet on the forecourt, at Shell or anywhere else? Ask the attendants to help you push the vehicle away from the pump. Then call 0333 366 0103 and tell us what was put in, roughly how much, and whether it has run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a different fault — Edgeside has a page just for it.
What makes one Edgeside petrol in a diesel task cost more than the next
Four separate tasks sit behind the four situations above — which is why there is no honest single price. Which of them you're in is mostly what moves your cost. Two things follow that: the petrol that got in as a proportion of what your tank holds, then the spot the car is in and whether a van can get to it safely.
That is why our engineers ask three questions before quoting instead of after: what was put in, how much, and whether it's run. With those answers, you get a straight figure rather than a range.
About Edgeside itself
Edgeside is a suburban area in Lancashire, situated on the riverside with nearby places including Piercy, Shaw Clough, and Siss Clough. Edgeside has a population of approximately 3160 residents and is characterised by predominantly terraced housing. Edgeside sits at an elevation of 250 metres, relatively close to Manchester, which is 15.4 miles away. Edgeside is located in the North West region of England, about 175.7 miles from London.
Fuel drain cover in Edgeside and across Lancashire
Piercy, Shaw Clough and Siss Clough are among the locations near Edgeside that the same teams work, answering petrol in diesel call-outs across Edgeside's BB postcode area. A forecourt, a supermarket car park, a lay-by or your own driveway are all places our engineers drain, and your vehicle doesn't need to move to us.
Edgeside: still at the petrol pump?
In that case, you could not be in a better spot. Keep it off. Phone.