Petrol in a Diesel Car in Western Hill: How Worried Should You Be?
Unstarted? Then less anxious than you probably are. Petrol sitting in a diesel tank does nothing to the engine until something pulls it through the fuel system — your ignition priming your pump, the starter, or the drive itself. So the fair answer to the first query everyone in Western Hill asks, "have I wrecked it?", is generally no. To keep it like that, call Petrol in Diesel then leave the motor alone. What petrol really does to a diesel, how to judge how far it's gone, and how to keep it from happening again: that is the rest of this page.
Inside your engine: what petrol in a diesel does
Diesel has two jobs on its way through an engine. It combusts, and before it combusts it lubricates. The high-pressure pump and the fuel injectors are built to very fine gaps, and your diesel passing through them is what keeps those surfaces from wearing against each other.
Of these two tasks, petrol manages the first poorly and the second not at all. A pump working on a petrol mixture is wearing itself out, since petrol is runnier than diesel and takes away the lubrication your fuel system relies on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that's where the knocking starts.
Combined, those make the shape of the issue clear. Not contact but movement is what causes the damage. Petrol in the tank is a fuel problem. A pump that has been working 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.
Petrol in a diesel around Western Hill: how bad is it? Four situations
The best case there is: filled up, never started. The petrol is inside your tank and just that tank, and the task is a drain and a flush where your car sits. This is the one situation that can only really take place on a forecourt, since anywhere else your car has been driven to get there.
The ignition switched on, or a short start. Once primed, the system has drawn petrol from your tank up to the fuel filter and your lines. That's generally still an easy job — a drain, a flush, and the filter dealt with.
Your pump has worked a few miles on thinned fuel — that is what driving the car meant. Mileage is only half of that; how hard it was driven counts equally. Either way the work runs to that tank, the lines, your filter and fresh fuel through the entire system. On the school run to St Margaret's Church of England Primary School, the miles is short. Any miles on the A1(M), under 3 miles from Western Hill, means the motor has worked hard throughout, and a run to Durham, under a mile away, makes a very different task as well.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone ragged. The fuel isn't behaving like diesel any more, and the motor is saying so. Stop where you are — on the verge on North Road, at the kerb, down a side road — and don't move it again. A car stopped soon very seldom has lasting damage, as the drain and the flush-through, which still go first, deal with it.
Western Hill people and the petrol in a diesel stories they hear
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. A bigger tank of the same mix is all it gives, since topping up removes nothing. Percentage isn't how a diesel fuel system tolerates petrol, however much that guidance presumes.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. More precise parts and higher pressure are how a current diesel runs its fuel, and that makes the protection matter more, not less.
This is the one that catches motorists. Myth: "If it starts and drives, there's no harm done." Feed diesel to a petrol engine and it usually won't run, and so the driver stops — and the damage stops with them. A diesel fed petrol usually starts, ticks over and drives away as though nothing has happened, while the pump wears. A running engine does not mean fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a different fault. What petrol has weakened stays thinned, and the petrol stays inside that tank anyway.
The next start sends petrol back round the pump from the lines and your filter, where some of it sits after your engine has run. That is why a DIY tank drain doesn't leave you sorted — a myth. On top of that, petrol cleared into a can by the road is truly hazardous.
How does petrol in a diesel occur?
A careless moment is seldom the cause, and nobody means to do it. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol motor at all. The forecourt makes it easy, and the slip runs one way.
The moment routine stops matching the car is the moment it happens. Hire cars, courtesy cars, and motors that are new to you. Households running one of each, petrol and diesel. A well-known forecourt with the pumps in a different order. A rushed fill en route to Durham with a train to catch. A new-to-you diesel Renault Megane, its first fuelling, and a motorist accustomed to petrol: exactly when it happens. With rain, a call arriving, or a car full of children to deal with, your hand simply does what it always has.
Western Hill drivers: how to prevent petrol in a diesel next time
- Read the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, yet not on every forecourt. The label is what counts.
- Plenty of vehicles state the fuel type inside your filler flap or on the cap, so check it on your first fill in a motor you do not know.
- One of each in the house? Label your key to the diesel — a bright fob, a sticker — because meaning to remember isn't enough.
- "Diesel", out loud, before you lift the nozzle — every time a new or hired car gets its first tank. It seems daft. It works.
- Thinking about something else is when this becomes an easy mistake to make, so put your phone away and keep your mind on the petrol pump.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to block a petrol nozzle, and add-on devices exist for the remainder. Treat it as a safety net, then keep checking the petrol pump.
- Less petrol makes a thinner blend, and so stop the moment you notice — though remembering that your next step is unchanged. It is still not to start it.
Put petrol in a diesel around Western Hill already?
Then, there's only a short order of things. Don't switch the ignition on, and don't crank it. Still on the forecourt, at Esso or anywhere else? Ask the attendants to help you push it away from the pump. Then call 0333 366 0103 and tell us what got in, about how much, and whether it has run.
Say so if it was AdBlue rather than petrol: it is a separate fault, with its own page for Western Hill, since AdBlue brings corrosion and deposits instead of lost lubrication.
What makes one Western Hill petrol in a diesel job cost more than the next
The four scenarios above are four different tasks, so no single quote for this would be honest. Which of them you are in is chiefly what moves your cost. Where the car is matters too, and whether a van can safely reach it, after the proportion of petrol to what the tank holds.
Three queries come first, before any quote, instead of after — what went in, how much, has it run — and this is the reason. A range becomes a straight figure when the answers are in.
About Western Hill itself
Western Hill is a suburban area located on the riverside in Durham, with a mix of terraced housing and a population of around 5220 residents. Western Hill sits at an elevation of 81 metres, close to the city centre of Durham, which is approximately 0.2 miles away. Western Hill is part of the wider urban area of Durham, near other suburbs such as North End and Aykley Heads.
Fuel drain cover across Durham, Western Hill included
Petrol in diesel jobs around Western Hill — part of the DH postcode area — go to teams that likewise cover the locations around it, Durham, North End and Aykley Heads included. The car doesn't need to move to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
Still at the petrol pump around Western Hill?
The best position there is, then — that is where you are. Ring, and keep it turned off.