Petrol in a Diesel Car in Tentersfield: How Worried Should You Be?
Probably less than you already are — as long as no one has started the car. Everyone around Tentersfield begins with "have I ruined it?", and the fair answer is generally no: petrol resting inside the tank of a diesel stays harmless until priming, cranking or driving draws it into the system. To leave the vehicle that way, call Petrol in Diesel and leave your motor switched off. Keep reading for three things: the effect petrol has inside a diesel engine, the clues of how far it has spread, and the way to make sure you don't repeat it.
What petrol in a diesel does to the engine
Passing through an engine, diesel does two things at once. It ignites, and before it ignites it lubricates. What keeps the surfaces inside the high-pressure fuel pump and the fuel injectors from grinding against one another is your diesel flowing through them — they are built to extremely fine tolerances.
Poorly at the first, not at all at the second: that is petrol. Being less viscous than diesel, petrol strips away the protection a fuel system needs, leaving a pump on that mixture wearing itself. It's equally made to resist igniting under compression — the reverse of what a diesel needs — which is where you hear the clattering.
The shape of the trouble is plain once you put those together. Not contact but movement is what does the harm. Where the petrol is only inside the tank, it is a fault of fuel, nothing more. The beginning of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds moves on with the fuel to the injectors beyond it.
How bad is petrol in a diesel? Four scenarios our engineers see in Tentersfield
The best case there can be: filled up, not once started. On a forecourt, and genuinely only there, that petrol is still confined to your tank — since anywhere else the vehicle was driven to get to it. The task is emptying and rinsing on the spot.
The ignition switched on, or a brief start. The fuel system has been primed, so petrol has left that tank and reached the fuel filter and the lines. Still normally straightforward: drain, flush, and the fuel filter seen to.
A few miles driven, and the pump has spent every one of them running on thinned fuel. The work is that tank, the fuel lines, the filter and fresh fuel through the entire system, and how hard the car was driven counts as much as how far. Driving the kids to Holy Trinity Primary School is one sort of trip. Any distance on the M66, under 3 miles from Tentersfield, means your engine has worked hard throughout, and a run to Salford, under 10 miles away, makes a very different task as well.
Driven on till it protested — knocking, smoke, a ragged idle, a dead throttle. The engine is telling you your fuel is no longer behaving like diesel. Leave it where it has stopped: a lay-by, a side street, the verge on A58. Permanent damage is very unusual when a car is stopped soon, and the drain and flush-through that still go first sort it out.
Stories Tentersfield people hear about petrol in a diesel
"Top it up the rest of the way with diesel and it will be fine" — a myth. It will not. A fuller tank of the same mixture is all it gives, because topping up removes nothing. A diesel fuel system does not accept petrol by percentage in the way that advice presumes.
Not so: a modern diesel copes with a bit of petrol. Rather, the opposite. A modern diesel runs its fuel through smaller components at higher pressure, which makes the protection count more, not less.
"It starts, it drives, and so no harm done" — the myth that trips up most drivers than any other. The motorist of a petrol motor fed diesel normally stops, since it will not run, and the damage stops there. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump wears. Fine and running aren't the same at all.
Myth: a two-stroke additive makes it safe to drive home. It was an old workaround, supposed for another problem. None of what petrol diluted is put back by it — and later, your tank still contains the petrol.
"Drain it yourself and you are sorted" — a myth, because after it has been running some petrol sits in your filter and lines, ready to go right back through the pump on the next start. Emptying petrol into a can at the roadside is also truly risky.
Why petrol in a diesel takes place so easily
No one does it on purpose, and it is seldom carelessness. The forecourt makes it simple: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle generally won't go into a petrol vehicle at all. So the slip runs one way.
It occurs when habit and the vehicle stop matching. Courtesy car, hire car, or a motor that is new. One petrol and one diesel on the drive of the same household. A forecourt you know, but with its pumps laid out differently. A train to catch, and a rushed fill en route to Kearsley. Years of petrol vehicles behind you, a diesel Renault Megane in front of you at the forecourt for its first tank — that's 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 around Tentersfield: preventing petrol in a diesel
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most generally do. Read the pump's label; the colour is only a hint.
- Many vehicles state the fuel inside your filler flap or on the cap, so check there on your first fill in any motor you don't know.
- Label your key. In a home with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- "Diesel", aloud, before you pick up the nozzle — every time a new or hired car gets its first tank. It seems silly. It does the trick.
- Mistakes like this are straightforward to make whilst your mind is on something else, and so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to block a petrol nozzle, and add-on devices are available for the remainder. Treat it as a safety net, and keep reading the pump.
- The moment you notice, stop: less petrol inside that tank makes a weaker mix. What to do next does not change, though — still don't crank it.
Tentersfield: already put petrol in a diesel?
Then the order of things is short. Starting it is out, and so is turning on the ignition. Still on the forecourt, at Tesco or anywhere else? Ask the staff to help you roll the vehicle clear of the petrol pump. Next, 0333 366 0103. We will ask what was put in, roughly how much, and if it has been run.
Corrosion and deposits form the trouble with AdBlue, where petrol brings lost protection. So if it was AdBlue, say so — and see its own Tentersfield page.
Why one petrol in a diesel job around Tentersfield costs more than another
The four situations above are four separate jobs, so no single price for this would be fair. What moves the cost is chiefly which of them you are in. Where the vehicle is counts too, and whether our van can safely get to it, after the ratio of petrol to what your tank holds.
Ahead of any quote, not after, come three questions: the fuel that went in, the amount, and if it's run. That's why. With the replies, there is a straight figure rather than a range.
About Tentersfield and its setting
Tentersfield is a suburban area situated near the lakeside in Greater Manchester, with an elevation of around 88 metres. Tentersfield lies approximately 7.8 miles from Salford and is part of the larger North West region. Tentersfield has a mix of housing types, but terraced housing is predominant in the area. Tentersfield is also close to nearby places such as Bury Ground, Bury, and Woodhill Fold.
Across Greater Manchester and around Tentersfield: fuel drain cover
Our vans answering petrol in diesel calls around Tentersfield, in the BL postcode area, equally work the locations around it, Bury Ground, Bury and Woodhill Fold among them. The vehicle 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 pump in Tentersfield?
The best place there is, then — that's where you are. Ring, and keep it turned off.