Should You Worry? Petrol in a Diesel Car in Old Trafford
If it hasn't been started, worry less than you probably are. Everyone around Old Trafford begins with "have I wrecked it?", and the honest answer is usually no: petrol resting inside that tank of a diesel stays harmless until priming, cranking or driving pulls it into your fuel system. To leave the vehicle that way, call Petrol in Diesel and leave your engine switched off. Read on for three things: the effect petrol has inside a diesel motor, the clues of how far it has spread, and the way to make sure you don't do it again.
Petrol in a diesel: what does it do to the motor?
Passing through an engine, diesel is doing two jobs at the same time. It burns, and before it burns it protects. Designed to extremely fine clearances, your injectors and your pump rely on your diesel moving through them to stop their surfaces wearing against one another.
Poorly at the first, not at all at the second: that is petrol. The clattering comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips away the protection the fuel system rests on, and any pump running on such a blend is wearing itself.
Combined, those make the shape of the trouble plain. It's circulation that causes the harm, not contact. Where the petrol is only inside your tank, it's a fault of fuel, nothing more. The beginning of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with the fuel to the fuel injectors downstream.
Four scenarios our engineers see around Old Trafford: how serious is petrol in a diesel?
Fuelled up, never started. The best case there is. At a forecourt, and genuinely only there, that petrol is still limited to your tank — since anywhere else your car was driven to reach it. The task is emptying and rinsing on the spot.
Started for a second, or only your ignition on. Petrol has come out of that tank and got to the filter and the fuel lines, since the system has been bled. That's generally still an easy job — a drain, a flush, and the filter seen to.
Those few miles driven meant the pump running on fuel diluted by petrol throughout. Tank, lines, filter, then clean fuel put through the whole system: that's this work, and the way the vehicle was driven matters as much as the mileage. On the school run to Seymour Park Community Primary School, the mileage is short. A run as far as Salford, under 3 miles away, is a very different task. So is any miles on the Mancunian Way, under 3 miles from Old Trafford, where the motor has been labouring hard throughout.
Driven on till it protested — clattering, smoke, a lumpy idle, a dead throttle. What you are hearing is your engine reporting fuel that no longer acts like diesel. Whether it's the verge on Talbot Road, a lay-by or a side road, stop where you are then leave it. A vehicle pulled over early very rarely has lasting damage, because the fuel drain and the flush-through, which still go first, deal with it.
What Old Trafford motorists get told about petrol in a diesel — and the myths in it
False: topping up to full with diesel makes it fine. It doesn't. A bigger tank of the same mix is all it gives, because topping up takes out nothing. The idea behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through more precise parts: that's how a current diesel moves its fuel, so the protection matters for more, not less.
"It starts, it drives, and so no harm done" — the myth that catches most people than any other. Feed diesel to a petrol motor and it normally will not run, so the motorist stops — and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile the pump wears. A running engine does not mean fine.
An outdated fix for a separate issue lies behind this one. Myth: "Add some two-stroke oil and drive the car home." It doesn't put back what petrol has diluted, and the petrol is still inside that tank later on.
"Drain it yourself and you're sorted" — a myth, because after it has been running some petrol sits in the fuel filter and lines, ready to go right back through the pump at the next start. It is also genuinely hazardous to drain petrol into a can at the kerbside.
Petrol in a diesel: how does it happen?
A careless moment is rarely the cause, and no one means to do it. One way only, because of the nozzles: the slimmer petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol vehicle. That's how the forecourt makes it easy.
Routine and the car falling out of step is when it happens. A new vehicle, a hire car or a courtesy car. A household with one petrol and one diesel on the driveway. Your usual forecourt, its pumps now in a different order. Racing for a train outside Manchester United Football Club and fuelling up en route. Exactly the moment it takes place: after years of driving petrol, someone fills a diesel Renault Clio for the first time. Add rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
Old Trafford people: how to avoid petrol in a diesel next time
- Read the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on each forecourt. The label is what counts.
- Plenty of motors state the fuel type inside your filler flap or on the cap, so check there on the first fill in a motor you do not know.
- Mark 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" out loud before you take the nozzle off the petrol pump. It sounds silly and it does the trick.
- While you are thinking about something else, this is an easy mistake to make — so put your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to refuse a petrol nozzle, and add-on devices exist for the remainder. Treat it as a safety net, then keep reading the petrol pump.
- Stop as soon as you realise. Less petrol inside that tank means a weaker mixture. It does not change what to do next, which is still not to crank it.
Put petrol in a diesel around Old Trafford already?
Then the order of things is brief. Starting it is out, and so is turning on your ignition. The attendants on the forecourt — whether at Esso itself or wherever you filled up — will normally help push it clear of the petrol pump if you ask. Next, 0333 366 0103. We'll ask what was put in, about how much, and if it's been run.
If it was AdBlue rather than petrol, say so. That is a different problem — corrosion and deposits and not lost protection — and it has its own page for Old Trafford.
Why one petrol in a diesel task around Old Trafford costs more than another
An honest single price doesn't exist here: four situations, four separate jobs. Mostly, the cost moves with which one you are in. Next it's the share — how much petrol went in against how much the tank holds — and after that where the vehicle is and whether our van can get to it safely.
What got in, how much, and whether it's run — three queries our technicians ask before pricing, not after, for exactly that reason. The answers change a range into a straight figure.
About Old Trafford and its setting
Old Trafford is a locality in Greater Manchester, situated on the riverside near the city of Salford. Old Trafford sits at an elevation of 32 metres, approximately 1.5 miles from Salford and 162.5 miles from London. Old Trafford is characterized by its predominantly flat-type housing and is surrounded by nearby places such as Firswood, St Georges, and Ordsall. Old Trafford has a population of around 2561 residents.
Across Greater Manchester and in Old Trafford: fuel drain cover
Old Trafford rests in the M postcode area, and the vans that answer petrol in diesel calls there work the places near it as well — Firswood, St Georges and Ordsall among them. No need to move your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places where we work.
Old Trafford: still at the pump?
Nothing beats it: that is where you now are. Phone, and leave it turned off.