Petrol in a Diesel Car in Consett: How Worried Should You Be?
Likely less than you are now — as long as no one has started it. "Have I wrecked it?" is the first thing anyone around Consett asks, and the honest answer is normally no, because petrol left in a diesel tank harms nothing till it is drawn through the fuel system — by ignition priming, by the starter, or by driving. Leave your engine off and call Petrol in Diesel — that keeps it that way. What petrol actually does to a diesel, how to judge how far it has travelled, and how to keep it from happening a second time: that's the rest of this page.
What petrol in a diesel does to the motor
Passing through a motor, diesel is doing two jobs at once. Oiling comes before burning; it does both. What keeps the surfaces inside your high-pressure pump and your injectors from wearing against one another is your diesel passing through them — they are built to very fine clearances.
Petrol does the first task badly and the second not at all. A pump running on a petrol blend is wearing itself out, because petrol is thinner than diesel and strips out the lubrication the fuel system depends on. Petrol is also made to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that's where the rattling starts.
Taken together, they make clear the shape the problem takes. Contact doesn't do the damage — circulation does. A tank with petrol in it is a fuel issue. After the pump has been labouring on that petrol, a mechanical issue has started: whatever is shed by a pump that is wearing down is carried downstream to the fuel injectors with the fuel.
Petrol in a diesel around Consett: how serious is it? Four cases
The best case there is: filled up, never started. Only the tank has petrol in it, and so the task is clearing that tank and rinsing the fuel system where your car stands. This scenario can only truly happen at a forecourt: anywhere else, your car got there by being driven.
Your ignition turned on, or a brief start. Petrol has left that tank and reached the filter and the lines, since your system has been bled. That is generally still an easy task — a drain, a flush, and the fuel filter seen to.
A few miles driven, and your pump has spent each of them running on weakened fuel. Tank, lines, filter, then fresh fuel put through the whole system: that is the work, and the way the car was driven matters as much as the miles. Short trips, such as the school run to Consett Infant School, are one matter. Any mileage on the A1(M), under 15 miles from Consett, means your engine has worked hard throughout, and a run to Durham, under 15 miles away, is a very different task as well.
Driven till it complained. Rattling, a ragged idle, smoke, a throttle that has gone soft. What you are hearing is your engine reporting fuel that no longer runs like diesel. Stop wherever you are — the verge on John Street, a lay-by, a side street — and leave it where it is. A vehicle pulled over quickly very rarely has long-term damage, since the drain and the flush, which still come first, deal with it.
What Consett motorists get told about petrol in a diesel — and the stories in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing comes out when you top up — the tank just carries more of the same blend. Percentage is not how a diesel fuel system tolerates petrol, however much that advice presumes.
"Modern diesels can handle a little petrol" — a myth, and closer to the reverse. Finer components and higher pressure are the way a current diesel runs its fuel, and that makes the lubrication count more, not less.
Myth: "If it starts and drives, there is no damage done." This is the one that fools people. A petrol motor fed diesel generally will not run, so the driver stops and the damage stops with them. Feed petrol to a diesel and it usually starts, idles and pulls away as if nothing has happened — all while its pump wears. Running isn't the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate fault. What petrol has weakened remains diluted, and the petrol remains inside that tank anyway.
Myth: "Drain that tank yourself and you are sorted." Once the motor has been run, some of that petrol is no longer in that tank: it is in your filter and the lines, and it goes right back through the pump on your next start. It's also really hazardous to drain petrol into a can by the kerbside.
Petrol in a diesel: how does it happen?
It is seldom carelessness, and no one does it on purpose. A diesel nozzle mostly won't go into a petrol car, yet the smaller petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake simple, and just in that direction.
The moment habit stops matching the car is the moment it takes place. A new vehicle, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. Your ordinary forecourt, its pumps suddenly in a different order. Racing for a train outside Stocksfield and fuelling up en route. The first fill-up in a diesel Renault Megane after years of driving petrol is precisely the moment it takes place. Your hand does what it has always done when you add rain, a phone call or a back seat full of children.
Consett motorists: how to prevent petrol in a diesel next time
- 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 only a clue.
- Check your filler flap. Many motors state the fuel inside the flap or on the cap. Look at it on the first fill in any car you do not know.
- Mark your 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 intending to remember.
- It seems silly and it works: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, and so put the phone away and keep your mind on the pump.
- Some diesels have a filler built to refuse a petrol nozzle, and devices you can add exist for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the pump.
- Spotting it mid-fill? Stop there and then. A thinner mix results from less petrol in that tank, but your next step stays the same: don't crank it.
Put petrol in a diesel in Consett already?
The order of things is short, then. Do not switch your ignition on, and don't fire it up. The staff at the forecourt — whether at Morrisons itself or wherever you filled up — will normally help roll it away from the petrol pump if you ask. Then ring 0333 366 0103 and tell us what went in, about how much, and whether it has run.
Say so if it was AdBlue rather than petrol: it's a separate issue, with its own page for Consett, since AdBlue brings corrosion and deposits instead of lost lubrication.
What makes one Consett petrol in a diesel task cost more than the next
The four scenarios above are four separate jobs, so no single price for this would be honest. What shifts your cost is chiefly which of them you are in. The proportion counts next, meaning how much of the tank is petrol, followed by the position of your car and whether getting to it is safe for a van.
That is why our technicians ask three questions before pricing instead of after: what went in, how much, and whether it has run. With those replies, you get a straight figure rather than a range.
About Consett, for a moment
Consett is a town in County Durham, situated inland at an elevation of 271 metres, with terraced housing being the predominant type of accommodation. Consett lies approximately 11 miles from the city of Durham and is surrounded by nearby places such as Crookhall, Blackhill, and Templetown. Consett has a population of around 16,989 people and is located about 241 miles north of London. Consett is characterised by its grid-like street pattern and rows of terraced houses.
Across Durham and around Consett: fuel drain cover
Crookhall, Blackhill and Templetown are among the spots around Consett that the same vans work, answering petrol in diesel calls across Consett's DH postcode area. Our technicians drain where the car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
At the petrol pump around Consett, right now?
Then, you could not be in a better position. Keep it off. Call.