How Worried Should You Be? Petrol in a Diesel Car in Perry Barr
Provided it hasn't been started, worry far less than you likely are. "Have I ruined it?" is the first question everyone in Perry Barr asks, and the honest answer is usually no, because petrol left in a diesel tank hurts nothing till it is dragged through the system — by ignition priming, by the starter, or by driving. Leave the engine off then call Petrol in Diesel — that is how you keep it that way. The remainder 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 does not happen to you again.
What petrol in a diesel does to the engine
Diesel does two jobs on its way through a motor. It protects first, and only then does it burn. Built to extremely fine clearances, the fuel injectors and the pump depend on the diesel moving through them to stop their surfaces wearing against one another.
The second job petrol does not do at all, and the first it does poorly. It's thinner than diesel and takes away the lubrication the system rests on, so a pump running on a petrol mix is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That is where the knocking comes from.
The shape of the trouble is clear when you put those together. Not contact but circulation is what does the damage. Any tank with petrol in it is a fuel problem. Whatever a worn pump sheds travels on, borne by the fuel, into the fuel injectors further along, which is why a pump that has worked on that petrol is where a mechanical fault starts.
Petrol in a diesel in Perry Barr: how serious is it? Four cases
Filled up, never started. The best case there can be. On a forecourt, and genuinely only there, that petrol is still limited to the tank — since anywhere else the car was driven to get to it. The job is emptying and purging on the spot.
Started for a second, or only your ignition on. The fuel system has been primed, and so petrol has left that tank and reached the fuel filter and the fuel lines. Usually little more than emptying, cleaning and seeing to the filter, and so still easy.
Your pump has worked a few miles on diluted fuel — that is what driving the vehicle meant. The work is the tank, the lines, the filter and fresh fuel through the whole circuit, and how hard the car was driven counts as much as how far. On the school run to Dorrington Academy, the mileage is short. Getting as far as Birmingham, under 5 miles away, makes a very different task — as does any miles on the M6 Motorway Bridge, under a mile from Perry Barr, with the engine labouring hard all the way.
Knocking, an uneven idle, smoke, a throttle gone soft: driven until it complained. That is your motor telling you its fuel no longer is acting like diesel. Whether it's the verge on Lymedene Road, a lay-by or a side road, stop where you are then leave it. Long-term damage is very uncommon when a car is pulled over quickly, and the drain and flush-through that still go first take care of it.
Stories Perry Barr people hear about petrol in a diesel
False: topping up to full with diesel makes it fine. It does not. A fuller tank of the same mix is all it gives, since topping up takes out nothing. Percentage isn't how a diesel fuel system tolerates petrol, however much that advice presumes.
"Current diesels can handle a little petrol" — a myth, and closer to the opposite. Lubrication counts more on current diesels, not less, because their fuel passes through smaller components at higher pressure.
The myth that catches drivers out: if it starts and drives, it must be unharmed. Diesel in a petrol motor usually means a motor that won't run: the driver stops, and so does the harm. A diesel fed petrol usually starts, ticks over and drives away as though nothing has happened, whilst your pump wears. Fine and running are not the same at all.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate fault. It does not put back what petrol has weakened, and that petrol is still inside the tank later.
Myth: "Drain the tank yourself and you are sorted." Once the motor has been run, some of that petrol is no longer inside your tank: it is in the filter and your lines, and it goes right back through the pump on your next start. Clearing petrol into a can by the roadside is also genuinely risky.
Why petrol in a diesel occurs at all
It's seldom carelessness, and no one does it on purpose. A diesel nozzle mostly will not 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 easy, and just in one direction.
It happens when routine and the car stop matching. A new motor, a hire car or a courtesy car. Two motors on one drive, one petrol, one diesel. The pumps in a different order on a familiar forecourt. Rushing for a train at Hamstead and fuelling up en route. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: exactly when it occurs. Your hand does what it has always done once you add rain, a phone call or a back seat full of kids.
How to avoid petrol in a diesel at your next fill-up around Perry Barr
- Green for unleaded and black for diesel is normal in the UK — but not on every forecourt. Trust the label on the pump, not the colour.
- The first fill in an unfamiliar car is the time to check your filler flap — inside it, or on the cap, many motors state which fuel to use.
- A coloured fob or a sticker on the 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.
- While you are thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to reject a petrol nozzle, and aftermarket devices exist for the remainder. Treat it as a safety net, and keep reading the pump.
- As soon as you notice, stop: less petrol inside that tank means a thinner mixture. What to do next does not change, though — still don't crank it.
Put petrol in a diesel in Perry Barr already?
The order of things is brief, then. Never fire it up, and don't turn your ignition on. The attendants on the forecourt — whether at the nearest petrol station itself or wherever you filled up — will normally help roll it away from the pump if you ask. Next, 0333 366 0103. We'll ask what went in, about how much, and if it has been run.
Say so if it was AdBlue rather than petrol: it's a separate fault, with its own page for Perry Barr, because AdBlue brings corrosion and deposits rather than lost lubrication.
What makes one Perry Barr petrol in a diesel job cost more than the next
A fair single price doesn't exist here: four scenarios, four separate jobs. Mostly, your cost shifts with which situation you're in. Two things follow that: the petrol that went in as a proportion of what the tank holds, then the place the vehicle is in and whether a technician can get to it safely.
Three questions come first, before quoting, instead of after — what went in, how much, has it run — and this is the reason. Their replies are what turn a range into one firm number.
About Perry Barr, for a moment
Perry Barr is a suburban area in the West Midlands, situated on the River Tame and close to the city of Birmingham. Perry Barr has a mix of housing types, but semi-detached homes are predominant in the area. Perry Barr is located near several other residential areas, including Tower Hill and Perry Beeches, and is about 3.4 miles from Birmingham city centre. Perry Barr sits at an elevation of around 112 metres above sea level.
Fuel drain cover around Perry Barr and across West Midlands
The teams answering petrol in diesel jobs around Perry Barr, in the B postcode area, equally work the locations around it, Tower Hill, Perry Beeches and Perry among them. The vehicle doesn't need to come to us: our technicians drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
At the petrol pump in Perry Barr, still?
The best place there is, then — that is where you are. Leave the car turned off, and ring.