How Worried Should You Be? Petrol in a Diesel Car in West Brompton
Not started? Then less worried than you probably are. "Have I wrecked it?" is the first thing anyone in West Brompton asks, and the truthful answer is usually no, because petrol left in a diesel tank hurts nothing till it's dragged through the system — by ignition priming, by the starter, or by driving. Leave your engine off then ring Petrol in Diesel — that keeps it that way. Read on for three things: the effect petrol has inside a diesel engine, the signs of how far it has got, and ways to make sure you never do it again.
What petrol in a diesel does to the engine
Passing through an engine, diesel is doing two things at the same time. It protects first, and after that does it burn. What stops the surfaces inside your high-pressure pump and your injectors from wearing down against each other is your diesel passing through them — they are made to extremely fine gaps.
Of those two jobs, petrol handles the first poorly and the second not at all. A pump running on a petrol blend 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 reverse of what a diesel wants from its fuel — and that is where any clattering starts.
Seen together, they make clear the shape the issue has. Contact does not do the damage — circulation does. Where that petrol is only inside your tank, it's a fault of fuel, nothing more. Whatever a worn pump sheds goes on, borne by the fuel, into the fuel injectors further along, which is why a pump that has worked on that petrol is where a mechanical fault starts.
Four situations our technicians see around West Brompton: how serious is petrol in a diesel?
Filled up, not once started. The best case there is. At a forecourt, and really only there, the petrol is still confined to that tank — since anywhere else the car was driven to get to it. The job is emptying and purging on the spot.
Ignition on, or started for a second. Petrol has come out of that tank and reached your filter and the lines, since the fuel system has been bled. That is usually still a straightforward job — a drain, a flush, and your filter dealt with.
Driven a few miles. Now your pump has spent these miles working on weakened fuel. Mileage is only half of it; how hard it was driven counts just as much. Either way the work includes the tank, the fuel lines, the fuel filter and clean fuel through the whole system. The school run to Bousfield Primary School is one matter. Very different again: a run to Westminster, under 3 miles away, or some mileage on the M4, under 5 miles from West Brompton, where the motor never stopped working hard.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone ragged. The fuel isn't acting like diesel any more, and your engine is saying so. Pull up on the spot — on the verge on Westgate Terrace, at the kerb, down a side road — and don't move it again. A car pulled over soon very rarely has permanent damage, since the fuel drain and the flush-through, which still go first, sort it out.
Stories West Brompton drivers hear about petrol in a diesel
False: topping up to full with diesel makes it fine. It does not. A bigger tank of the same mix is all you get, because topping up removes nothing. The assumption behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
Not so: a newer diesel copes with a bit of petrol. Rather, the reverse. Protection counts more on modern diesels, not less, because their fuel passes through smaller components at higher pressure.
This is the one that catches drivers. Myth: "If it starts and drives, there is no damage done." Any petrol engine fed diesel generally won't run, so the motorist stops and the harm stops with them. A diesel fed petrol usually starts, ticks over and drives away as if nothing has happened, while your pump wears. Fine and running are not the same at all.
Myth: "Add some two-stroke oil and drive it home." It's an old workaround for a distinct issue. None of what petrol diluted gets put back by it — and afterwards, the tank still contains that petrol.
Once the motor has run, part of that petrol sits in your filter and the lines, not the tank — and the next start pulls it right back through the pump. So the myth "drain that tank yourself and you are sorted" does not hold. Besides, petrol emptied into a can by the road is genuinely dangerous.
How petrol ends up: petrol in a diesel
A careless moment is seldom the cause, and no one means to do it. A diesel nozzle generally will not fit a petrol car, yet the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error simple, and only in that direction.
Routine and the vehicle falling out of step is when it takes place. Courtesy car, hire car, or a car that is new. One petrol and one diesel on the driveway of the same household. The pumps in a different order on a well-known forecourt. A rushed fill on the way to the nearest station with a train to catch. Years of petrol vehicles behind you, a diesel Volkswagen Passat in front of you on the forecourt for its first tank — that's when. Throw in rain, a phone call or a back seat full of kids, and your hand does what it has always done.
West Brompton motorists: how to prevent petrol in a diesel next time
- The label is what matters, and so check the pump instead of the colour: in the UK unleaded handles are usually green and diesel black, yet not on every forecourt.
- In a motor you do not know, look inside the flap over your filler or at the cap before your first fill: plenty of cars state the fuel there.
- Label your key. In a home with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- "Diesel", out loud, before you pick up the nozzle — every time a new or hired car gets its first tank. It sounds daft. It does the trick.
- Whilst you are thinking about something else, this is an easy mistake to make — so tuck the phone away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to reject a petrol nozzle, and add-on devices exist for motors without one. They are a safety net, not a reason to stop checking the pump.
- Less petrol means a thinner blend, so stop as soon as you notice — while remembering that the next stage is unchanged. It's still not to crank it.
Put petrol in a diesel around West Brompton already?
The order of things is brief, then. Don't fire it up, and do not turn your ignition on. Ask the attendants to help you roll it away from the petrol pump if you are still at the forecourt, whether that's Esso or anywhere else. Call 0333 366 0103 next, with three facts — your fuel, the rough amount, and whether it's run.
Corrosion and deposits form the trouble with AdBlue, whereas petrol brings lost lubrication. So if it was AdBlue, say so — and read its own West Brompton page.
West Brompton petrol in a diesel jobs: why one costs more than another
Four different tasks sit behind the four situations above — which is why there is no fair single price. Which of them you are in is chiefly what shifts the cost. The ratio counts next, meaning how much of that tank is petrol, and then the position of the vehicle and whether reaching it is safe for a van.
That's why we ask three queries before costing rather than after: what was put in, how much, and if it's run. Their answers are what change a range into one firm number.
About West Brompton, for a moment
West Brompton is a suburban area in the inland part of Greater London, with an elevation of around 13 metres above sea level. West Brompton sits close to several notable areas, including Earls Court, South Kensington, and Walham Green, and is approximately 3 miles from central London. West Brompton is predominantly composed of flat dwellings, housing a population of around 21241 residents. West Brompton is also near Westminster, which is about 2.9 miles away.
Fuel drain cover in West Brompton and across Greater London
Petrol in diesel call-outs around West Brompton — part of the SW postcode area — go to teams that likewise cover the spots around it, Earls Court, South Kensington and Walham Green among them. The car doesn't need to move to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the pump in West Brompton?
Nothing beats it: that's where you now are. Keep the car turned off, and ring.