How Worried Should You Be? Petrol in a Diesel Car in Tardy Gate
Provided it hasn't been started, worry less than you probably are. Until the ignition primes the pump, your starter cranks, or the vehicle is driven, petrol in a diesel tank just sits there and does no harm. Which makes the truthful reply to the first Tardy Gate question — "have I ruined it?" — usually no. To keep the car like that, call Petrol in Diesel then leave your engine switched off. Keep reading for three things: the effect petrol has inside a diesel motor, the clues of how far it has got, and the way to make sure you don't do it again.
What petrol in a diesel does to your engine
Diesel has two tasks on its way through an engine. Oiling comes before burning; it does both. The high-pressure pump and the fuel injectors are designed to extremely fine clearances, and your diesel passing through them is what stops those surfaces from grinding against each other.
Petrol does the first job badly and the second not at all. A pump running on a petrol blend is wearing itself out, because petrol is thinner than diesel and strips out the lubrication the fuel system relies on. Petrol is also made to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that is where any knocking starts.
Combined, those leave the shape of the trouble plain. Contact doesn't do the damage — circulation does. Where that petrol is only in the tank, it is an issue of fuel, nothing more. After the pump has been working on that petrol, a mechanical fault has started: anything shed by a pump that is wearing down travels onward to your injectors with the fuel.
Petrol in a diesel in Tardy Gate: how serious is it? Four situations
Fuelled up, not once started. The best case there can be. At a forecourt, and genuinely only there, that petrol is still limited to the tank — since everywhere else the car was driven to get to it. The task is emptying and rinsing on the spot.
Your ignition turned on, or a short start. With your system primed, your lines and filter already hold petrol that came from that tank. Drain, flush, deal with the fuel filter: still normally simple.
Some miles driven, and your pump has spent each of them running on weakened fuel. The work is your tank, the lines, the filter and fresh fuel through the whole system, and how hard the vehicle was driven matters as much as how far. The school run to Lostock Hall Community Primary School is one matter. Very different once more: a trip to Preston, under 3 miles away, or some miles on the M65, under a mile from Tardy Gate, where your engine never stopped running hard.
Driven on till it protested — knocking, smoke, a ragged idle, a dead throttle. That is your motor telling you its fuel no longer is behaving like diesel. Leave it where it has stopped: a lay-by, a quiet street, the verge on Moss Street. A car stopped quickly very seldom has permanent damage, as the fuel drain and the flush-through, which still come first, deal with it.
Myths Tardy Gate motorists hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing comes out when you top up — your tank simply holds more of the same mixture. A diesel fuel system does not tolerate petrol by percentage in the way that advice assumes.
Myth: a modern diesel copes with a bit of petrol. Rather, the reverse. A current diesel runs its fuel through smaller components at higher pressure, which makes the lubrication count more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there's no harm done." Diesel in a petrol motor generally means a motor that won't run: the driver stops, and so does the damage. Whilst the pump grinds, a diesel fed petrol usually starts, ticks over and drives away as if nothing has happened. A running engine does not mean fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an outdated workaround for a distinct problem. The petrol is still in your tank afterwards, and what it has thinned is not put back.
Once the engine has been run, part of the petrol is in your filter and the lines, not that tank — and your next start pulls it straight back through your pump. So the myth "drain that tank yourself and you are sorted" doesn't stand up. Besides, petrol drained into a can by the road is genuinely dangerous.
How does petrol in a diesel take place?
On purpose? Never. Through carelessness? Rarely, if ever. The petrol nozzle is the narrower of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol car at all. The forecourt makes it easy, and the error runs one way.
Routine and the car falling out of step is how it happens. Any motor that is new to you — a hire car, on loan as a courtesy car, or brand new. Two vehicles on one driveway, one petrol, one diesel. A forecourt you know, only with its pumps laid out differently. A train to catch, and a hurried fill on the way to Lostock Hall. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is exactly the moment it happens. With rain, a call coming in, or children to deal with, the hand just does what it has always done.
Tardy Gate drivers: how to prevent petrol in a diesel next time
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most usually do. Check the petrol pump's label; the colour is only a clue.
- Plenty of motors state the fuel type inside the filler flap or on the cap, so check it on the first fill in a motor you do not know.
- One of each in the home? Label your key to your diesel — a coloured fob, a sticker — because intending to remember isn't enough.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the pump. It sounds silly and it works.
- Mistakes like this are easy to make while your mind is on something else, so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to block a petrol nozzle, and add-on devices are available for the remainder. Treat it as a backstop, then keep reading the petrol pump.
- The moment you realise, stop: less petrol inside your tank means a thinner blend. What to do next doesn't change, though — still don't crank it.
Put petrol in a diesel around Tardy Gate already?
In that case, there's just a short order of things. Never crank it, and don't turn your ignition on. If you're still on the forecourt — Shell or anywhere else — ask the attendants to help you push the vehicle away from the petrol pump. Ring 0333 366 0103 next, with three answers — your fuel, the approximate volume, and if it's run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a different issue — Tardy Gate has a page just for it.
One petrol in a diesel job in Tardy Gate costs more than another. Why?
Four separate tasks sit behind the four situations above — which is why there's no honest single price. Mostly, your cost shifts with which one you're in. Where your car is counts too, and whether a van can safely get to it, after the ratio of petrol to what the tank holds.
That's why our engineers ask three queries before pricing instead of after: what was put in, how much, and whether it has run. With the replies, you get a straight figure rather than a range.
About Tardy Gate
Tardy Gate is a suburban area situated on the riverside in Lancashire, with a relatively low elevation of 40 metres. Tardy Gate lies close to the city of Preston, approximately 2.3 miles away, and is near other local places such as Lostock Hall and Farington Moss. Tardy Gate has a population of around 6429 people and predominantly consists of semi-detached housing.
Across Lancashire and in Tardy Gate: fuel drain cover
The vans answering petrol in diesel calls around Tardy Gate, in the PR postcode area, equally work the places near it, Lostock Hall, Cuerden Green and Farington Moss included. Our engineers drain where your vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Tardy Gate: still at the pump?
Then you're in the best position there is. Turned off it stays; then call.