Gorseinon Garden Village: Petrol in a Diesel Car? How Worried to Be
Less than you probably are, if it hasn't been started. Everyone around Gorseinon Garden Village begins with "have I ruined it?", and the honest answer is normally no: petrol left inside your tank of a diesel remains harmless until priming, cranking or driving draws it into the fuel system. To keep the car that way, ring Petrol in Diesel then leave the motor switched off. Further down, you will find what petrol really does inside a diesel, how far it might have gone, and how to stop it happening to you again.
Inside the engine: what petrol in a diesel does
Diesel has two tasks on its way through an engine. It combusts, and before it combusts it lubricates. What keeps the surfaces inside your high-pressure pump and the injectors from grinding against each other is the diesel flowing through them — they're designed to very fine tolerances.
The second task petrol doesn't do at all, and the first it does poorly. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump on the blend to wear itself. It is equally made to resist igniting under compression — the opposite of what a diesel needs — which is why you get the clattering.
The shape of the trouble is plain once you put those together. The damage is done by movement, not by contact. A tank with petrol in it is a fuel problem. Whatever a worn pump sheds goes on, borne by your fuel, into your injectors further along, which is why a pump that has worked on the petrol is where a mechanical problem starts.
Petrol in a diesel in Gorseinon Garden Village: how bad is it? Four cases
Fuelled, and never started: no case is better. On a forecourt, and really only there, the petrol is still confined to that tank — since anywhere else the car was driven to reach it. The task is draining and rinsing on the spot.
Your ignition switched on, or a short start. Your system has been primed, and so petrol has left your tank and got to the filter and the fuel lines. Still normally straightforward: drain, flush, and your filter dealt with.
Driven a couple of miles. Now your pump has spent these miles labouring on weakened fuel. The work is your tank, the fuel lines, the fuel filter and fresh fuel through the whole system, and how hard the car was driven counts as much as how far. The school run to the local primary school is one matter. A run as far as Swansea, under 5 miles away, is a very different job. So is any mileage on the M4, under 3 miles from Gorseinon Garden Village, where your engine has been running hard throughout.
Knocking, an uneven idle, smoke, a throttle gone soft: driven till it complained. What you are hearing is the motor signalling fuel that no longer acts like diesel. Stop wherever you are — the verge on Garden Crescent, a lay-by, a side street — and leave the vehicle where it is. What goes first is still the drain and flush, and that deals with it, with long-term damage very uncommon when a car is stopped soon.
What Gorseinon Garden Village drivers get told about petrol in a diesel — and the stories in it
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. A bigger tank of the same mix is all you get, since topping up removes nothing. Percentage is not how a diesel fuel system tolerates petrol, however much that advice presumes.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the reverse. Protection counts more on modern diesels, not less, because their fuel passes through finer parts at higher pressure.
"It starts, it drives, and so there is no harm" — the myth that catches most drivers than any other. Feed diesel to a petrol motor and it normally will not run, so the motorist stops — and the harm stops with them. A diesel fed petrol generally starts, ticks over and drives away as though nothing has happened, whilst the pump wears. Fine and running aren't the same at all.
Myth: "Add some two-stroke oil and drive it home." It is an old fix for a separate fault. None of what petrol thinned gets put back by it — and afterwards, the tank still contains that petrol.
"Drain it yourself and you are sorted" — a myth, because after it has been running some petrol sits in your filter and lines, waiting to go right back through the pump at your next start. On top of that, petrol drained into a can by the road is truly hazardous.
How petrol ends up: petrol in a diesel
A careless moment is rarely the cause, and nobody means to do it. The forecourt makes it easy: the petrol nozzle is the slimmer of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle generally won't go into a petrol motor at all. So the error runs one way.
It happens when habit and the car stop matching. Courtesy car, hire car, or a car that's new. Two vehicles on one driveway, one petrol, one diesel. A well-known forecourt with the pumps in a different order. A hurried fill en route to Gowerton with a train to catch. Years of petrol vehicles behind you, a diesel Renault Megane in front of you at the forecourt for its first tank — that is when. Your hand repeats what it has always done once you add rain, a phone call or a back seat full of children.
Next time you fill up in Gorseinon Garden Village: avoiding petrol in a diesel
- Green for unleaded and black for diesel is normal in the UK — yet not on each forecourt. Trust the label on the pump, not the colour.
- Many cars state the fuel inside the filler flap or on the cap, and so check there on your first fill in a vehicle you don't know.
- Good intentions do less than a sticker or a fob in a vivid colour on the diesel's key when a home has one of each. So mark it.
- "Diesel", aloud, before you lift the nozzle — every time a new or hired car gets its first tank. It seems daft. It works.
- Whilst you're thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Add-on devices are available for cars without one, and some diesels are built with a filler that will not accept a petrol nozzle. Helpful — but a backstop only, never a reason to stop checking the label.
- Stop as soon as you notice. Less petrol inside your tank means a thinner mix. It doesn't change what to do next, which is still not to fire it up.
Petrol already in a diesel in Gorseinon Garden Village? Start here
The order of things is short, then. Leave it unstarted, with the ignition switched off as well. The staff at the forecourt — whether at Murco itself or wherever you filled up — will normally help push it clear of the pump if you ask. Next, 0333 366 0103. We'll ask what was put in, about how much, and if it's been run.
If it was AdBlue instead of petrol, say so. That is a separate fault — corrosion and deposits rather than lost protection — and it has its own page for Gorseinon Garden Village.
Gorseinon Garden Village petrol in a diesel jobs: why one costs more than another
The four situations above are four different jobs, so no single price for this would be fair. Which of them you're in is chiefly what moves the cost. The ratio counts next, meaning how much of your tank is petrol, followed by the location of your car and whether reaching it is safe for a technician.
What was put in, how much, and if it's run — three queries our technicians ask before pricing, not after, for precisely that reason. With those replies, there is a straight figure instead of a range.
About Gorseinon Garden Village
Gorseinon Garden Village is a suburban area located near the coast in Swansea, with Gorseinon Garden Village sitting at an elevation of 26 metres above sea level. Gorseinon Garden Village is situated approximately 4.7 miles from Swansea city centre, with Gorseinon Garden Village being close to nearby places such as Gorseinon, Gowerton, and Penllergaer. Gorseinon Garden Village has a population of around 1600 people, with Gorseinon Garden Village predominantly consisting of semi-detached housing.
Fuel drain cover across Swansea, Gorseinon Garden Village included
Gorseinon Garden Village sits in the SA postcode area, and our vans that answer petrol in diesel call-outs there work the places near it as well — Gorseinon, Gowerton and Penllergaer among them. You need not move your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations where we work.
At the pump around Gorseinon Garden Village, still?
Then, you couldn't be in a better position. Switched off it stays; then phone.