Should You Worry? Petrol in a Diesel Car in Warwick Bridge
Likely less than you are now — provided no one has started the vehicle. Till your ignition primes your pump, your starter cranks, or the vehicle is driven, petrol in a diesel tank just waits there and does nothing. Which means the truthful reply to that first Warwick Bridge question — "have I ruined it?" — normally no. Keep it that way: leave the engine off then ring Petrol in Diesel. Read on for three things: the effect petrol has inside a diesel engine, the signs of how far it has spread, and ways to make sure you don't repeat it.
What petrol in a diesel does to your engine
Passing through an engine, diesel is doing two things at once. Lubricating comes before burning; it does both. Designed to very fine tolerances, your injectors and the pump depend on your diesel flowing through them to stop their surfaces wearing against one another.
Of those two tasks, petrol handles the first badly and the second never. A pump running on a petrol blend is wearing itself out, because petrol is runnier than diesel and strips out the protection the fuel system relies on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that is where the knocking comes.
The shape of the trouble is plain when you put those together. Contact does not do the harm — circulation does. Petrol in a tank is a fuel problem. After the pump has been running on that petrol, a mechanical issue has started: anything shed by a pump that is wearing travels downstream to the injectors with your fuel.
Warwick Bridge, petrol in a diesel: four cases, from mild to major
Filled up, and not started: nothing beats it. Just the tank has petrol in it, and so the task is emptying that tank and rinsing the system where your car stands. This situation can only really take place at a forecourt: anywhere else, your car got there by being driven.
The ignition switched on, or a short start. Petrol has come out of that tank and reached your filter and your lines, because your system has been bled. That is generally still an easy task — a drain, a flush, and the filter dealt with.
Your pump now spent a couple of miles on weakened fuel — that's what driving it meant. The work is that tank, the fuel lines, your filter and fresh fuel through the whole circuit, and how hard the car was driven counts as much as how far. Short trips, like the school run to Warwick Bridge Primary School, are one matter. Any mileage on the M6, under 3 miles from Warwick Bridge, means your engine working hard throughout, and a run to Carlisle, under 5 miles away, makes a very different job too.
Driven till it complained. Rattling, a lumpy idle, smoke, a throttle that has gone soft. The fuel isn't acting like diesel any more, and your motor is saying so. Whether it is the verge on Mill Riggs, a lay-by or a side road, stop where you are then leave it. Lasting damage is very rare if a car is stopped quickly, and the drain and flush that still go first take care of it.
Warwick Bridge motorists and that petrol in a diesel stories they hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Nothing is removed by topping up — you're left with a fuller tank, still the same mixture. A diesel fuel system does not accept petrol by percentage in the way that advice supposes.
"Modern diesels can handle a little petrol" — a myth, and closer to the reverse. At higher pressure, through more precise components: that's how a current diesel moves its fuel, so the protection counts more, not less.
"It starts, it drives, so no harm done" — the myth that trips up most drivers than any other. The driver of a petrol engine fed diesel usually stops, because it will not run, and the harm stops there. Feed petrol to a diesel and it usually starts, ticks over and pulls away like nothing happened — all the while its pump is wearing. Fine and running aren't the same at all.
Myth: "Add some two-stroke oil and drive it home." It's an outdated workaround for a different fault. It doesn't put back what petrol has diluted, and the petrol is still in your tank later.
"Drain it yourself and you are sorted" — a myth, because after it's been running some petrol lies in the fuel filter and lines, ready to go straight back through your pump on the next start. It is also truly dangerous to drain petrol into a can at the kerbside.
How petrol ends up: petrol in a diesel
It is seldom carelessness, and no one does it on purpose. A diesel nozzle generally won't go into a petrol motor, but the narrower 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. A new car, a hire car or a courtesy car. Two cars on one driveway, one petrol, one diesel. A well-known forecourt with the pumps in a different order. A hurried fill on the way to Wetheral with a train to catch. A new-to-you diesel Renault Clio, its first fuelling, and a motorist used to petrol: precisely when it happens. Add a back seat full of kids, a phone call or rain, and habit wins.
Next time you fill up in Warwick Bridge: preventing petrol in a diesel
- The label is what counts, so check the petrol pump rather than the colour: in the UK unleaded handles are normally green and diesel black, yet not on every forecourt.
- In a car you don't know, look inside the flap over the filler or at the cap before your first fill: many vehicles print the fuel type there.
- Label the key. In a household with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- Before the nozzle leaves the petrol pump the first time you fill a hired or new car, say "diesel" aloud. Silly, yes, but it does the trick.
- Whilst you're thinking about something else, this is an easy mistake to make — so put the phone away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to refuse a petrol nozzle, and add-on devices exist for cars without one. They are a safety net, not a reason to stop checking the petrol pump.
- Less petrol means a weaker mix, and so stop as soon as you realise — while remembering that your next step is unchanged. It is still not to start the car.
Warwick Bridge: already put petrol in a diesel?
Then, there is only a short order of things. Do not switch your ignition on, and don't fire it up. The staff at the forecourt — whether at BP itself or wherever you filled up — will usually help roll it away from the petrol pump if you ask. Phone 0333 366 0103 next, with three facts — the fuel, the approximate volume, and if it's run.
If it was AdBlue rather than petrol, say so. That's a separate problem — corrosion and deposits rather than lost protection — and it has its own page for Warwick Bridge.
Why one petrol in a diesel task around Warwick Bridge costs more than another
The four situations above are four separate jobs, so no single quote for this would be fair. Mostly, the cost moves with which one you are in. The ratio counts next, meaning how much of the tank is petrol, and then the position of the car and whether reaching it is safe for a van.
What got in, how much, and if it's run — three queries we ask before quoting, not after, for exactly that reason. A range turns into a straight figure once those replies are in.
About Warwick Bridge, for a moment
Warwick Bridge is a village situated on the River Eden in Cumbria, with a mix of semi-detached housing and other residential properties. Warwick Bridge sits at an elevation of 27 metres, close to the city of Carlisle, and is surrounded by nearby places such as Little Corby and Corby Hill. Warwick Bridge has a population of approximately 871 residents, and its riverside setting provides a distinctive character to the village. Warwick Bridge is located about 4.6 miles from Carlisle, making it a commuter-friendly location.
Fuel drain cover around Warwick Bridge and across Cumbria
Petrol in diesel jobs around Warwick Bridge — part of the CA postcode area — go to teams that likewise cover the spots around it, Little Corby, Corby Hill and Burnrigg among them. The vehicle does not need to come to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the petrol pump around Warwick Bridge?
Nothing beats it: that's where you now are. Switched off it stays; then phone.