How Worried Should You Be? Petrol in a Diesel Car in Gartsherrie
Not started? Then less worried than you likely are. "Have I wrecked it?" is the first thing anyone around Gartsherrie asks, and the truthful answer is usually no, because petrol resting in a diesel tank harms nothing till it's dragged through the system — by ignition priming, by the starter, or by being driven. To keep the vehicle that way, call Petrol in Diesel then leave your motor switched off. Further down, this page sets out what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you again.
Petrol in a diesel: what does it do to the engine?
Two tasks fall to diesel on its route round a motor. It combusts, and before it ignites it lubricates. Very fine tolerances are built into the injectors and the high-pressure pump, and just the diesel running through stops their surfaces grinding together.
The second task petrol doesn't do at all, and the first it does badly. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, leaving a pump on the mixture wearing itself. It is equally made to resist igniting under compression — the reverse of what a diesel needs — which is why you get the rattling.
The shape of the problem is clear once you put those together. Not contact but movement is what causes the harm. A tank with petrol in it is a fuel fault. After the pump has been labouring on that petrol, a mechanical problem has started: whatever is shed by a pump that's wearing is carried onward to the fuel injectors with the fuel.
Four situations our engineers see in Gartsherrie: how bad is petrol in a diesel?
The best case there can be: filled up, not once started. The petrol is in the tank and only the tank, and the task is a drain and a flush where the vehicle stands. This is the one situation that can only really take place on a forecourt, as anywhere else the car has been driven to get there.
Started for a second, or just the ignition on. With the system primed, the lines and filter already contain petrol that came from that tank. Drain, flush, see to the filter: still usually straightforward.
Some miles driven, and the pump has spent every one of them working on weakened fuel. The work is that tank, the lines, the filter and clean fuel through the whole circuit, and how hard your car was driven counts as much as how far. Driving the children to the local primary school is one sort of trip. A run as far as Glasgow, under 10 miles away, is a very different job. So is any miles on the M73, under 3 miles from Gartsherrie, where the motor has been labouring hard the whole time.
Knocking, a lumpy 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. Leave it where it has stopped: a lay-by, a side street, the verge on Hornock Road. A vehicle stopped soon very seldom has permanent damage, because the fuel drain and the flush, which still come first, sort it out.
Myths Gartsherrie drivers hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing is removed by topping up — you are left with a fuller tank, still the same mixture. Percentage is not how a diesel fuel system tolerates petrol, whatever that advice presumes.
If anything, the opposite holds. Myth: "A current diesel can cope with a bit of petrol." A newer diesel sends its fuel through more precise components at higher pressure, which makes the lubrication matter more, not less.
This is the one that fools people. Myth: "If it starts and drives, there is no damage done." Feed diesel to a petrol motor and it generally will not run, and so the motorist stops — and the damage stops with them. Feed petrol to a diesel and it generally fires up, idles and pulls away as if nothing happened — all while its pump is wearing. Fine and running are not the same at all.
Myth: "Add some two-stroke oil and drive it home." It is an old workaround for a different problem. It doesn't put back what petrol has weakened, and the petrol is still inside that tank later on.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol lies in the fuel filter and lines, ready to go straight back through the pump at your next start. Clearing petrol into a can by the kerbside is also genuinely hazardous.
Petrol in a diesel: how does it happen?
It's rarely carelessness, and no one does it on purpose. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol vehicle at all. The forecourt makes it easy, and the slip runs one way.
Habit and the car falling out of step is how it occurs. A vehicle that's new to you — hired, on loan as a courtesy car, or just bought. One petrol and one diesel on the drive of the same household. A well-known forecourt with the pumps in a different order. Rushing for a train at Coatbridge Sunnyside and fuelling up en route. The first fill-up in a diesel Renault Megane after years of driving petrol is exactly the moment it takes place. Add a back seat full of kids, a phone call or rain, and habit takes over.
How to prevent petrol in a diesel at your next fill-up in Gartsherrie
- A green handle for unleaded and black for diesel is normal in the UK — yet not on every forecourt. Trust the label on the petrol pump, not the colour.
- The first fill in a new car is the time to check your filler flap — on it, or on the cap, plenty of cars state the fuel to use.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, in a home with one of each.
- "Diesel", out loud, before you pick up the nozzle — every time a new or hired car gets its first tank. It sounds silly. It works.
- Mistakes like this are straightforward to make whilst your mind is on something else, and so the phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to block a petrol nozzle, and add-on devices are available for motors without one. They are a backstop, not a reason to stop reading the pump.
- The moment you notice, stop: less petrol in the tank means a thinner blend. What to do next does not change, though — still don't crank it.
Petrol already in a diesel in Gartsherrie? Begin here
Then the order of things is brief. Do not switch your ignition on, and do not start it. The attendants on the forecourt — whether at Asda itself or wherever you filled up — will usually help roll it away from the petrol pump if you ask. What got in, about how much, and whether it's run: tell us that when you phone 0333 366 0103.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a separate fault — Gartsherrie has a page just for it.
Why one petrol in a diesel job around Gartsherrie costs more than another
Four different jobs lie behind the four situations above — which is why there's no fair single quote. The situation itself does most of the work of moving the cost. Beyond that it is the share — how much petrol was put in against how much the tank holds — and then where your car is and whether a technician can reach it safely.
Three queries come first, before any quote, rather than after — what was put in, how much, has it run — and that is the reason. Those replies turn a range into a straight figure.
About Gartsherrie, for a moment
Gartsherrie is a suburban area in North Lanarkshire, situated on the riverside at an elevation of 87 metres, with Glasgow approximately 8 miles to the west. Gartsherrie is characterized by its predominantly flat-type housing and is located near other local places such as Sunnyside and Summerlee. Gartsherrie has a population of around 4849 residents and is part of the wider Glasgow urban area. Gartsherrie is some 341 miles northwest of London, in the central Scottish lowlands.
Fuel drain cover around Gartsherrie and across North Lanarkshire
Sunnyside, Summerlee and Greenhill are among the places around Gartsherrie that the same teams work, answering petrol in diesel call-outs across Gartsherrie's ML postcode area. No need to bring the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places we drain.
At the petrol pump around Gartsherrie, right now?
Then, you couldn't be in a better position. Keep it off. Phone.