Brindle Heath: Petrol in a Diesel Car? How Worried to Be
Probably less than you already are — as long as nobody has started the car. Till your ignition primes your pump, your starter turns, or the vehicle is driven, petrol in a diesel tank just rests there and does no harm. Which means the truthful reply to the first Brindle Heath question — "have I wrecked it?" — normally no. Petrol in Diesel is who to ring, with the engine kept off, and so it stays that way. What petrol really does to a diesel, how to gauge how far it's travelled, and how to stop it from happening again: that's the remainder of this page.
The motor and petrol in a diesel: what goes on
Passing through a motor, diesel is doing two jobs at once. It ignites, and before it ignites it lubricates. What keeps the surfaces inside your high-pressure pump and the fuel injectors from grinding against each other is your diesel passing through them — they're built to very fine gaps.
Badly at the first, not at all at the second: that is petrol. A pump running on a petrol blend is wearing itself out, because petrol is thinner than diesel and strips out the protection the fuel system depends on. Petrol is also made to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that is where any rattling comes.
Together, those make the shape of the trouble plain. It is circulation that does the harm, not contact. Petrol in a tank is a fuel issue. Whatever a worn pump sheds travels on, carried by the fuel, into the injectors downstream, which is why a pump that has been working on that petrol is where a mechanical issue starts.
How serious is petrol in a diesel? Four scenarios we see around Brindle Heath
Filled up, not once started. The best case there can be. Only the tank has petrol in it, and so the job is clearing the tank and cleaning the system where your car sits. This scenario can only really take place on a forecourt: anywhere else, the vehicle got there by being driven.
The ignition switched on, or a short start. The fuel system has been primed, so petrol has left that tank and reached your filter and the fuel lines. Drain, flush, deal with the fuel filter: still normally simple.
Those few miles driven meant your pump working on fuel weakened by petrol throughout. How hard the car was driven counts as much as how far, and this work covers your tank, your lines, the filter and clean fuel through the entire circuit. Short trips, such as the school run to Holy Family VA RC Primary School, are one thing. A run as far as Salford, under a mile away, is a very different task. So is any distance on the M602, under a mile from Brindle Heath, where your engine has been running hard throughout.
Driven on until it protested — knocking, smoke, an uneven idle, a soft throttle. The fuel isn't acting like diesel any more, and the engine is saying so. Stop wherever you are — the verge on Langworthy Road, a lay-by, a side street — and leave the vehicle where it is. A vehicle stopped soon very rarely has lasting damage, since the drain and the flush-through, which still come first, deal with it.
Brindle Heath drivers and that petrol in a diesel myths they hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up takes out nothing; it gives you a fuller tank of the same mixture. The assumption behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." A modern diesel runs its fuel through smaller parts at higher pressure, which makes the lubrication matter more, not less.
"It starts, it drives, so no harm done" — the myth that trips up more drivers than any other. The driver of a petrol motor fed diesel usually has no choice but to stop, because it will not run, and the harm stops there. While your pump wears, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Running isn't the same as fine.
An outdated fix for a separate problem lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." The petrol is still inside that tank after that, and whatever it has weakened is not put back.
The next start sends petrol back round the pump out of the fuel lines and your filter, where some of that sits once the engine has been run. That is why draining the tank yourself doesn't sort it — a myth. Draining petrol into a can at the kerbside is also genuinely dangerous.
How does petrol in a diesel happen?
No one does it on purpose, and it's seldom carelessness. A diesel nozzle generally won't go into a petrol car, yet the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake simple, and just in that direction.
When habit and the car stop matching, it occurs. Any vehicle that's new to you — hired, on loan as a courtesy car, or brand new. A household with one petrol and one diesel on the drive. A well-known forecourt with the pumps in a different order. A train to catch, and a hurried fill en route to Salford Crescent. Years of petrol motors behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that is when. Add a back seat full of kids, a phone call or rain, and habit takes over.
Avoiding petrol in a diesel next time you fill up in Brindle Heath
- A green handle for unleaded and black for diesel is normal in the UK — but not on each forecourt. Trust the label on the petrol pump, not the colour.
- Many vehicles state the fuel type inside the filler flap or on the cap, and so check there on your first fill in a vehicle you do not know.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of meaning to remember, for a household with one of each.
- Before the nozzle leaves the pump the first time you fill a hired or new car, say "diesel" aloud. Daft, perhaps, but it works.
- Whilst you are thinking about something else, this is an easy mistake to make — so put the phone away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to reject a petrol nozzle, and add-on devices exist for the remainder. Count it as a backstop, and keep checking the petrol pump.
- As soon as you realise, stop: less petrol inside that tank means a thinner mix. What to do next doesn't change, though — still do not crank it.
Put petrol in a diesel in Brindle Heath already?
Then the order of things is short. Never start the car, and don't turn the ignition on. The attendants at the forecourt — whether at BP itself or wherever you filled up — will usually help roll it clear of the petrol pump if you ask. Then phone 0333 366 0103 and tell us what was put in, roughly how much, and if it has run.
If it was AdBlue and not petrol, say so. That is a separate issue — corrosion and deposits rather than lost lubrication — and it has its own page for Brindle Heath.
Brindle Heath petrol in a diesel tasks: why one costs more than another
There is no honest single price for this, since the four scenarios above are four separate jobs. Chiefly, the cost moves with which situation you are in. Two things come after that: the petrol that was put in as a share of what your tank takes, then the place the vehicle is in and whether our van can get to it safely.
That's why we ask three queries before quoting rather than after: what went in, how much, and whether it has run. Given those answers, there is a straight figure instead of a range.
About Brindle Heath, for a moment
Brindle Heath is a suburban area in Greater Manchester, situated near the city of Salford and close to nearby places such as Pendleton and Seedley. Brindle Heath has a population of around 5854 people and is characterised by semi-detached housing. Brindle Heath sits at an elevation of 69 metres, in the inland setting of the North West region. Brindle Heath is located approximately 164.8 miles from London, but is closely tied to the nearby urban centre of Salford, being just 0.9 miles away.
Fuel drain cover across Greater Manchester, Brindle Heath included
The vans answering petrol in diesel jobs around Brindle Heath, in the M postcode area, also work the locations around it, Pendleton, Seedley and Irlams o th Height among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all places our engineers work, and the vehicle does not need to move to us.
In Brindle Heath and still at the petrol pump?
Then you're in the best position there can be. Switched off it remains; then call.