Should You Worry? Petrol in a Diesel Car in Northfield
Less than you probably are, provided it hasn't been started. Petrol sitting in a diesel tank does nothing to the engine till something pulls it through the fuel system — the ignition priming the pump, your starter, or driving on its own. So the honest answer to the first query anyone around Northfield asks, "have I wrecked it?", is generally no. Keep it like that: leave your motor off then call Petrol in Diesel. What petrol really does to a diesel, how to judge how far it has travelled, and how to stop it from happening again: that's the rest of this page.
What petrol in a diesel does to the motor
Diesel does two tasks on its way through a motor. Oiling comes before burning; it does both. The high-pressure pump and the injectors are built to very fine tolerances, and your diesel passing through them is what keeps those surfaces from grinding against each other.
Poorly at the first, not at all at the second: that is petrol. A pump working on a petrol mixture is wearing itself out, because petrol is thinner than diesel and strips out the protection the fuel system relies on. Petrol is also made to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that is where the rattling comes.
Together, those make the shape of the issue plain. The harm is done by movement, not by contact. All a tank with petrol in it amounts to is a fuel fault. Once the pump has been running on that petrol, a mechanical fault has begun: whatever is shed by a pump that is grinding is carried onward to your injectors with your fuel.
How bad is petrol in a diesel? Four situations we see in Northfield
The best case there can be: filled up, never started. Just that tank has petrol in it, and so the task is emptying the tank and purging the system where the car sits. This scenario can only really occur at a forecourt: anywhere else, the car got there by being driven.
A moment's running, or merely the ignition on. Once primed, the fuel system has drawn petrol out of your tank up to your filter and the fuel lines. Normally little more than draining, rinsing and sorting your filter, so still straightforward.
Your pump has worked a few miles on thinned fuel — that is what driving the car does. The work is the tank, the lines, your filter and fresh fuel through the entire system, and how hard your car was driven matters as much as how far. Short trips, like the school run to All Saints Church of England Infant Academy, are one thing. Very different once more: a run to Kingston upon Hull, under 5 miles away, or some distance on the M180, under 10 miles from Northfield, where the motor kept labouring hard.
Driven till it complained. Rattling, a lumpy idle, smoke, a throttle that has gone soft. The fuel is not behaving like diesel any more, and your motor is telling you. Stop on the spot — on the verge on Crossfield Road, at the kerb, down a side road — and don't move it. The drain and flush-through still come first, and they take care of it: when a vehicle is pulled over soon, permanent damage is very unusual.
Northfield people and that petrol in a diesel myths they hear
"Top it up the rest of the way with diesel and it will be fine" — a myth. It will not. A bigger tank of the same mixture is all you get, since topping up takes out nothing. Percentage isn't how a diesel fuel system tolerates petrol, whatever that guidance presumes.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. Finer parts and higher pressure are how a modern diesel runs its fuel, and that makes the lubrication matter more, not less.
"It starts, it drives, and so there is no harm" — the myth that trips up most motorists than any other. Any petrol motor fed diesel generally will not run, so the motorist stops and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile the pump grinds. Running doesn't mean fine.
An outdated workaround for a different fault is behind this one. Myth: "Add some two-stroke oil and drive the car home." What petrol has weakened stays diluted, and the petrol remains in the tank regardless.
"Drain it yourself and you're sorted" — a myth, since after it's been running some petrol sits in the filter and lines, waiting to go straight back through your pump on the next start. It is also genuinely dangerous to drain petrol into a can by the roadside.
How petrol ends up: petrol in a diesel
It's rarely carelessness, and no one does it on purpose. One way only, since of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, while the diesel one generally won't fit a petrol vehicle. That is how the forecourt makes it straightforward.
The moment routine stops matching the vehicle is the moment it happens. Courtesy car, hire car, or a motor that is new. Households running one of each, petrol and diesel. A forecourt you know, only with its pumps arranged differently. A train to catch, and a rushed fill on the way to Hessle. Precisely the moment it occurs: after years of driving petrol, someone fills a diesel Volkswagen Passat for the first time. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
Northfield people: how to prevent petrol in a diesel next time
- Green for unleaded and black for diesel is usual in the UK — but not on each forecourt. Trust the label on the petrol pump, not the colour.
- Many vehicles state the fuel inside the filler flap or on the cap, and so check it on your first fill in any motor you don't know.
- Mark the key. In a house 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 the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It seems silly and it works.
- Put your phone away. This is an easy mistake to make whilst you're thinking about something else.
- Some diesels come with a filler built to block a petrol nozzle, and devices you can add are available for motors without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop checking the petrol pump.
- The moment you realise, stop: less petrol inside the tank means a weaker mix. What to do next does not change, though — still do not fire it up.
Petrol already in a diesel around Northfield? Start here
In that case, there's just a short order of things. Leave it unstarted, with the ignition switched off too. Ask the staff to help you roll it away from the pump if you are still at the forecourt, whether that's Esso or anywhere else. Ring 0333 366 0103 next, with three facts — your fuel, the rough quantity, and if it has run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a different problem — Northfield has a page just for it.
What makes one Northfield petrol in a diesel job cost more than the next
The four scenarios above are four separate jobs, so no single price for this would be fair. Mostly, your cost moves with which one you are in. Two things follow that: the petrol that was put in as a share of what the tank holds, then the place the car is in and whether our van can reach it safely.
That is why our technicians ask three queries before quoting instead of after: what went in, how much, and if it has run. A range turns into a straight figure when the answers are in.
About Northfield itself
Northfield is a suburban area in the East Riding of Yorkshire, situated near the coast and approximately 4 miles from Kingston upon Hull. Northfield has a relatively low elevation of around 6 metres above sea level, and its location near the Humber Estuary has influenced its development. Northfield is characterized by its predominantly terraced housing stock, which reflects the area's history of residential growth. Northfield is close to nearby places such as Hessle, Low Field, and South Field, and is part of the larger urban area surrounding Kingston upon Hull.
Fuel drain cover around Northfield and across East Riding of Yorkshire
The teams answering petrol in diesel call-outs in Northfield, in the HU postcode area, also work the places near it, Hessle, Low Field and South Field included. The car doesn't need to move to us: our technicians drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Northfield: still at the petrol pump?
No position is better: that's where you are. Phone, and leave it turned off.