Costessey Park: Petrol in a Diesel Car? How Worried to Be
Provided it has not been started, you can worry far less than you probably are. "Have I ruined it?" is the first question anyone in Costessey Park asks, and the truthful answer is usually no, since petrol left in a diesel tank hurts nothing till it's dragged through the system — by ignition priming, by the starter, or by driving. Keep it like that: leave your engine off and call Petrol in Diesel. What petrol actually does to a diesel, how to judge how far it's travelled, and how to keep it from happening again: that is the remainder of this page.
The motor and petrol in a diesel: what goes on
On its way through a motor, diesel does two tasks. It protects first, and only then does it burn. Very fine clearances go into your injectors and your high-pressure pump, and only your diesel running through stops those surfaces grinding together.
Petrol does the first job badly and the second not at all. A pump running on a petrol mixture is wearing itself out, because petrol is thinner than diesel and takes away the lubrication the fuel system depends on. Petrol is also made to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that's where the rattling comes.
Taken together, they make clear the shape the trouble takes. Contact does not do the harm — movement does. Petrol in the tank is a fuel problem. Once your pump has been working on that petrol, a mechanical fault has started: whatever is shed by a pump that's wearing down travels downstream to the injectors with your fuel.
Costessey Park, petrol in a diesel: four situations, from mild to significant
Fuelled but never started — as good as it gets. Being at a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With that petrol kept in that tank alone, it's emptied and flushed on the spot, and nothing more is needed.
A moment's running, or just the ignition on. Your system has been bled, and so petrol has left the tank and reached the fuel filter and the fuel lines. Normally little more than draining, purging and sorting your filter, so still easy.
Those few miles on the road were the pump labouring on fuel diluted by petrol throughout. Tank, lines, filter, then clean fuel put through the entire system: that is the work, and the way the car was driven matters as much as the mileage. Short trips, like the school run to St Augustine's Catholic Primary School, Costessey, are one matter. Any distance on the M11, over 50 miles from Costessey Park, means your engine working hard throughout, and a run to Norwich, under 5 miles away, makes a very different task too.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone ragged. That is the motor telling you its fuel no longer is acting like diesel. Pull up wherever you are — the verge on Parklands, a lay-by, a side street — and leave the car where it is. A car pulled over quickly very seldom has long-term damage, since the drain and the flush, which still go first, deal with it.
Costessey Park motorists and the petrol in a diesel myths they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Topping up removes nothing; it gives you a fuller tank of the same mixture. The assumption behind that advice — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. A current diesel sends its fuel through smaller components at higher pressure, which makes the protection count more, not less.
This is the one that catches motorists. Myth: "If it starts and drives, there's no harm done." The motorist of a petrol motor fed diesel usually stops, because it will not run, and the harm stops there. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile your pump grinds. Being able to run is not the same as being fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a different problem. What petrol has weakened stays thinned, and that petrol stays in your tank regardless.
"Drain it yourself and you're sorted" — a myth, since after it's been running some petrol lies in the filter and lines, waiting to go right back through the pump at the next start. And, a can of petrol filled at the roadside is genuinely risky.
Petrol in a diesel: how does it happen?
A careless moment is rarely the cause, and nobody means to do it. One way only, since of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol vehicle. That is how the forecourt makes it easy.
The moment habit stops matching the vehicle is the moment it takes place. Hire cars, courtesy cars, and motors that are new to you. A household with one petrol and one diesel on the driveway. The pumps in a different order on a familiar forecourt. Rushing for a train at Norwich and fuelling up en route. Exactly the moment it takes place: after years of driving petrol, someone fills a diesel Renault Megane for the first time. Throw in a back seat full of children, a phone call or rain, and the hand takes over.
Costessey Park drivers: how to avoid petrol in a diesel next time
- Green for unleaded and black for diesel is normal in the UK — but not on every forecourt. Go by the label on the pump, not the colour.
- Plenty of vehicles state the fuel inside the filler flap or on the cap, and so check there on the first fill in any car you do not know.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, for a home with one of each.
- It sounds daft and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away and keep your mind on the pump.
- Some diesels come with a filler designed to block a petrol nozzle, and devices you can add exist for motors without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the petrol pump.
- Spotting it halfway? Stop there and then. A weaker mixture results from less petrol in that tank, yet your next step stays the same: don't fire it up.
Costessey Park: already put petrol in a diesel?
Then the order of things is brief. Do not switch the ignition on, and do not fire it up. If you're still on the forecourt — Sainsbury's or anywhere else — ask the staff to help you push it clear of the petrol pump. Call 0333 366 0103 next, with three answers — your fuel, the approximate volume, and whether it has run.
If it was AdBlue and not petrol, say so. That is a different problem — corrosion and deposits rather than lost lubrication — and it has its own page for Costessey Park.
One petrol in a diesel job around Costessey Park costs more than another. Why?
An honest single quote doesn't exist here: four scenarios, four separate tasks. The scenario itself does most of the work of moving your cost. Two things come after that: the petrol that went in as a proportion of what that tank takes, then the spot your car is in and whether a van can get to it safely.
Three questions come first, before any quote, instead of after — what went in, how much, has it run — and that is the reason. The replies change a range into a straight figure.
About Costessey Park itself
Costessey Park is a locality situated on the River Wensum in Norfolk, with a mix of detached housing and open spaces. Costessey Park lies close to the city of Norwich, which is approximately 4.4 miles away, and is part of the wider area that includes nearby places such as Costessey and New Costessey. Costessey Park has a relatively low elevation of around 16 metres above sea level, typical of the riverside setting in this part of Eastern England.
Across Norfolk and in Costessey Park: fuel drain cover
Costessey Park rests in the NR postcode area, and our vans that answer petrol in diesel calls there work the places near it as well — Costessey, Queens Hills and New Costessey among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations our technicians drain, and the vehicle doesn't need to move to us.
In Costessey Park and still at the petrol pump?
Then you are in the best place there can be. Keep the car turned off, then ring.