Accrington: Petrol in a Diesel Car? How Worried to Be
Far less than you likely are, provided it hasn't been started. "Have I ruined it?" is the first question everyone around Accrington asks, and the truthful answer is normally no, since petrol resting in a diesel tank hurts nothing till it is dragged through the fuel system — by ignition priming, by your starter, or by driving. To keep the vehicle that way, call Petrol in Diesel then leave your engine switched off. What petrol really does to a diesel, how to gauge how far it's travelled, and how to keep it from happening again: that is the remainder of this page.
What petrol in a diesel does to your engine
On its way through an engine, diesel does two tasks. It protects to begin with, and only then does it burn. What keeps the surfaces inside your high-pressure pump and your injectors from wearing against one another is your diesel flowing through them — they are designed to extremely fine tolerances.
Of those two jobs, petrol manages the first poorly and the second not at all. Being less viscous than diesel, petrol strips out the protection a fuel system needs, leaving a pump running on that mixture to wear itself. It is equally made to resist igniting under compression — the opposite of what a diesel needs — which is where you hear the rattling.
Together, those leave the shape of the trouble plain. It's movement that does the damage, not contact. All a tank with petrol in it amounts to is a fuel issue. A pump that has been running on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the fuel injectors further on.
How serious is petrol in a diesel? Four situations we see in Accrington
The best case there can be: filled up, never started. The petrol is inside that tank and only the tank, and the job is a drain and a flush where the vehicle sits. This is the one situation that can only truly occur at a forecourt, since anywhere else your car has been driven to get there.
A moment's running, or merely the ignition on. Once primed, the fuel system has drawn petrol from that tank up to the fuel filter and your lines. Drain, flush, see to the filter: still normally straightforward.
Driven a few miles. Now your pump has spent these miles running on diluted fuel. The work is the tank, your lines, the filter and fresh fuel through the entire circuit, and how hard your car was driven matters as much as how far. On the school run to Accrington Benjamin Hargreaves Church of England Primary School, the miles is short. A run as far as Preston, under 15 miles away, is a very different task. So is any miles on the M65, under 3 miles from Accrington, where your engine has been working hard throughout.
Driven until it protested. Knocking, a ragged idle, smoke, a throttle that has gone soft. The fuel is not behaving like diesel any more, and the engine is telling you. Leave it where it stops: a lay-by, a quiet street, the verge on Market Place. What goes first is still the drain and flush-through, and that sorts it out, with long-term damage very unusual when a vehicle is stopped quickly.
Accrington people and the petrol in a diesel stories 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. Percentage isn't how a diesel fuel system copes with petrol, whatever that guidance presumes.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. Lubrication counts more on modern diesels, not less, because their fuel runs through more precise parts at higher pressure.
One myth that catches drivers off guard: if it starts and drives, it must be unharmed. Any petrol motor fed diesel usually will not run, so the motorist stops and the damage stops with them. A diesel fed petrol normally starts, ticks over and drives away as though nothing has happened, while your pump wears. Being able to run isn't proof of being fine.
An old fix for a different problem is behind this one. Myth: "Add some two-stroke oil and drive the car home." That petrol is still inside that tank afterwards, and whatever it has weakened isn't put back.
If the engine has run, part of that petrol sits in the filter and the fuel lines, not that tank — and your next start sends it right back through the pump. So the myth "drain your tank yourself and you are sorted" doesn't hold. And, a can of petrol filled at the kerbside is truly risky.
Petrol in a diesel: how does it happen?
A careless moment is seldom the cause, and no one means to do it. A diesel nozzle mostly will not fit a petrol vehicle, but the smaller petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake simple, and only in that direction.
It happens when routine and your car stop matching. A new motor, a hire car or a courtesy car. A household with one petrol and one diesel on the driveway. The pumps in a different order on a familiar forecourt. A rushed fill on the way to the nearest station with a train to catch. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it happens. Throw in rain, a phone call or a back seat full of children, and your hand repeats what it has always done.
Preventing petrol in a diesel next time you fill up in Accrington
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Check the pump's label; the colour is just a clue.
- Plenty of cars state the fuel inside the filler flap or on the cap, so check it on your first fill in any motor you do not know.
- Label the key. In a household with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember.
- "Diesel", aloud, before you pick up the nozzle — every time a new or hired car needs its first tank. It seems daft. It works.
- Put your phone away. This is an easy mistake to make while you are thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to refuse a petrol nozzle, and add-on devices are available for the remainder. Count it as a backstop, and keep reading the pump.
- Less petrol means a thinner blend, so stop as soon as you realise — though remembering that the next stage is unchanged. It is still not to start it.
Already put petrol in a diesel around Accrington?
Then the order of things is brief. Do not switch your ignition on, and do not fire it up. Yet at the forecourt, at Esso or anywhere else? Ask the staff to help you roll the car away from the pump. Phone 0333 366 0103 next, with three answers — your fuel, the approximate quantity, and if it has run.
If it was AdBlue instead of petrol, say so. That's a separate issue — corrosion and deposits and not lost protection — and it has its own page for Accrington.
What makes one Accrington petrol in a diesel task cost more than the next
There is no honest single price for this, because the four situations above are four different jobs. What moves your cost is mostly which of them you are in. The ratio counts next, meaning how much of your tank is petrol, and then the position of the car and whether getting to it is safe for a van.
Before any quote, not after, we ask three queries: the fuel that went in, the volume, and whether it's run. That's why. A range becomes a straight figure once those answers are in.
About Accrington
Accrington is a town located in Lancashire, England, positioned on the banks of a river. It sits within the Hyndburn borough, near several major towns and cities. The town is nestled in a spot that provides easy access to nearby urban centres, including Blackburn and Manchester. Accrington serves as the main settlement in the area and is home to the local council.
Fuel drain cover across Lancashire, Accrington included
Our vans answering petrol in diesel calls in Accrington, in the BB postcode area, equally work the places around it, Lower Fold, Barnfield and Scaitcliffe among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots our engineers work, and your car does not need to move to us.
Still at the pump around Accrington?
The best position there is, then — that's where you are. Keep it off. Call.