Should You Worry? Petrol in a Diesel Car in Old Benwell
Far less than you likely are, provided it has not been started. Petrol resting in a diesel tank does nothing to the motor until something draws it through the system — the ignition priming the pump, your starter, or the drive on its own. So the honest answer to the first query everyone around Old Benwell asks, "have I wrecked it?", is normally no. To keep the car that way, phone Petrol in Diesel and leave the motor switched off. What petrol really does to a diesel, how to judge how far it has gone, and how to keep it from happening again: that is the remainder of this page.
What petrol in a diesel does to the motor
Diesel does two jobs on its way through a motor. Before it ignites, it protects — then it combusts. Very fine gaps go into the fuel injectors and the high-pressure fuel pump, and just your diesel running through stops those surfaces grinding together.
Badly at the first, not at all at the second: that is petrol. A pump working on a petrol mixture is wearing itself out, since petrol is runnier than diesel and strips out the lubrication the fuel system depends on. Petrol is also made to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that's where any knocking starts.
Seen together, they make clear what shape the problem has. Contact doesn't do the harm — movement does. All a tank with petrol in it amounts to is a fuel issue. Once your pump has been running on that petrol, a mechanical issue has begun: anything shed by a pump that is wearing is carried downstream to the injectors with the fuel.
Four scenarios we see in Old Benwell: how bad is petrol in a diesel?
Filled up, and never started: no case is better. At a forecourt, and genuinely only there, the petrol is still confined to the tank — because everywhere else the vehicle was driven to get to it. The task is draining and rinsing on the spot.
Your ignition turned on, or a short start. Petrol has left your tank and got to the filter and your lines, since your system has been bled. Usually nothing more than emptying, cleaning and sorting the filter, and so still straightforward.
Driven a couple of miles. Now the pump has spent those miles running on diluted fuel. How hard the vehicle was driven matters as much as how far, and the work covers that tank, the fuel lines, the filter and clean fuel through the entire system. A school run to Bridgewater Primary School is one matter. Very different a second time: a trip to Newcastle upon Tyne, under 3 miles away, or some distance on the Central Motorway East, under 3 miles from Old Benwell, where the engine kept labouring hard.
It protested, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone ragged. What you are hearing is your motor reporting fuel that no longer behaves like diesel. Pull up wherever you are — the verge on Betts Avenue, a lay-by, a side street — then leave it there. Lasting damage is very uncommon when a vehicle is pulled over early, and the drain and flush-through that still come first sort it out.
Stories Old Benwell motorists 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. Nothing is removed when you top up — that tank simply carries more of the same blend. A diesel fuel system does not accept petrol by percentage in the way that guidance presumes.
Myth: a modern diesel copes with a bit of petrol. Rather, the opposite. More precise parts and higher pressure are the way a current diesel runs its fuel, and that makes the lubrication count more, not less.
One myth that catches drivers 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, idles and drives away as if nothing has happened, while your pump grinds. Running is not the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a distinct problem. It doesn't put back what petrol has diluted, and the petrol is still inside that tank afterwards.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol lies in your filter and lines, waiting to go right back through the pump at your next start. Besides, petrol emptied into a can by the road is genuinely dangerous.
How it happens: petrol in a diesel
It is seldom carelessness, and nobody does it on purpose. A diesel nozzle generally won't fit a petrol car, but the smaller petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error straightforward, and just in one direction.
It takes place when habit and the vehicle stop matching. Hire cars, courtesy cars, and cars that are new to you. A household with one petrol and one diesel on the driveway. Your normal forecourt, its pumps now in a different order. Fuelling up in a rush en route to Metrocentre, with a train to catch. A new-to-you diesel Renault Megane, its first fuelling, and a motorist used to petrol: exactly when it happens. With rain, a call arriving, or a car full of children to deal with, your hand simply does what it always has.
Avoiding petrol in a diesel next time you fill up around Old Benwell
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most generally do. Check the petrol pump's label; the colour is just a clue.
- In a vehicle you do not know, look inside the flap over your filler or at the cap before your first fill: many cars state the fuel type there.
- One of each in the household? Mark your key to your diesel — a coloured fob, a sticker — because meaning to remember isn't enough.
- "Diesel", aloud, before you lift the nozzle — every time a new or hired car needs its first tank. It sounds daft. It does the trick.
- Mistakes like this are easy to make whilst your mind is on something else, so your phone goes away.
- Add-on devices are available for motors without one, and some diesels come with a filler that will not take a petrol nozzle. Useful — but a backstop at best, never a reason to stop checking the label.
- Spotting it mid-fill? Stop at once. A thinner mix results from less petrol in your tank, yet your next stage remains the same: do not crank it.
Put petrol in a diesel in Old Benwell already?
Short and simple, then, is the order of things. Do not switch the ignition on, and do not fire it up. If you're still on the forecourt — BP or anywhere else — ask the staff to help you push it away from the petrol pump. Then phone 0333 366 0103 and tell us what went in, about how much, and whether it's run.
If it was AdBlue and not petrol, say so. That's a different problem — corrosion and deposits and not lost lubrication — and it has its own page for Old Benwell.
What makes one Old Benwell petrol in a diesel task cost more than the next
There's no honest single quote for this, because the four scenarios above are four separate jobs. Which of them you are in is chiefly what moves the cost. After that it is the share — how much petrol got in against how much your tank takes — and then where your car is and whether a van can get to it safely.
Ahead of any quote, not after, we ask three questions: the fuel that got in, its amount, and whether it has run. That is why. With the answers, there is a straight figure rather than a range.
About Old Benwell, for a moment
Old Benwell is a suburban area located inland in Tyne and Wear, sitting at an elevation of 92 metres near the city of Newcastle upon Tyne. Old Benwell is characterized by its semi-detached housing and is situated close to nearby places such as Scotswood and Benwell. Old Benwell is approximately 2.7 miles from Newcastle upon Tyne and around 247.9 miles from London.
Fuel drain cover in Old Benwell and across Tyne and Wear
Scotswood, Benwell and Paradise are among the locations near Old Benwell that the same vans work, answering petrol in diesel call-outs across Old Benwell's NE postcode area. Our engineers drain wherever your car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the pump around Old Benwell?
In that case, you could not be in a better spot. Keep it off. Ring.