How Worried Should You Be? Petrol in a Diesel Car in Blackhill
Unstarted? Then less worried than you likely are. Petrol resting in a diesel tank does nothing to your motor until something pulls it through your fuel system — the ignition priming the pump, the starter, or driving itself. So the truthful answer to the first question everyone in Blackhill asks, "have I wrecked it?", is generally no. Leave your engine off then call Petrol in Diesel — that is how you keep it like that. The rest of this page covers what petrol really does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you a second time.
Petrol in a diesel: what does it do to the engine?
Two jobs fall to diesel on its journey round a motor. Before it combusts, it protects — then it burns. What keeps the surfaces inside the high-pressure pump and the injectors from grinding against one another is your diesel passing through them — they are built to very fine clearances.
Of those two jobs, petrol manages the first badly and the second never. The knocking comes from petrol being designed not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection the system rests on, and any pump working on that mixture is wearing itself.
Put those together and the shape of the issue is plain. Contact does not do the damage — movement does. Petrol in the tank is a fuel issue. Whatever a worn pump sheds goes on, borne by your fuel, into your injectors downstream, which is why a pump that has worked on the petrol is where a mechanical problem starts.
Four situations we see in Blackhill: how bad is petrol in a diesel?
Filled but never started — as good as it gets. On a forecourt, and really only there, the petrol is still confined to the tank — because anywhere else the car was driven to get to it. The task is emptying and rinsing on the spot.
A brief spell of running, or just your ignition on. Your system has been bled, so petrol has left your tank and got to your filter and the lines. Normally little more than draining, flushing and sorting the fuel filter, and so still straightforward.
The pump has spent a couple of miles on weakened fuel — that is what driving the vehicle does. The work is that tank, the lines, the filter and fresh fuel through the entire system, and how hard your car was driven counts as much as how far. On the school run to the local primary school, the miles is small. A run as far as Glasgow, under 3 miles away, is a very different job. So is any mileage on the M8, under a mile from Blackhill, where the motor has been labouring hard throughout.
Driven until it protested. Rattling, an uneven idle, smoke, a throttle that has gone soft. What you are hearing is your motor signalling fuel that no longer runs like diesel. Whether it is the verge on Langdale Street, a lay-by or a side road, stop where you are then leave it. The fuel drain and flush still come first, and they sort it out: if a car is pulled over soon, permanent damage is very rare.
Petrol in a diesel myths Blackhill people hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing comes out when you top up — the tank simply carries more of the same mixture. The assumption behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong.
If anything, the opposite holds. Myth: "A current diesel can cope with a bit of petrol." Lubrication matters more on newer diesels, not less, because their fuel runs through finer parts at higher pressure.
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 normally will not run, and so the driver stops — and the damage stops with them. Feed petrol to a diesel and it normally fires up, ticks over and pulls away as if nothing has happened — all while its pump wears. Fine and running are not the same thing.
Myth: a two-stroke additive lets you to drive home. It is an old workaround, supposed for another problem. What petrol has diluted stays thinned, and that petrol remains in that tank anyway.
Myth: "Drain your tank yourself and you are sorted." After the engine has run, some of that petrol is no longer in the tank: it is in the fuel filter and the lines, and it goes straight back through the pump at the next start. On top of that, petrol emptied into a can by the road is genuinely hazardous.
How it happens: petrol in a diesel
No one does it on purpose, and it's seldom carelessness. 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 mostly will not go into a petrol vehicle at all. So the slip runs one way.
When habit and the car stop matching, it occurs. A new motor, a hire car or a courtesy car. Households running one of each, petrol and diesel. The pumps in a different order on a well-known forecourt. Racing for a train at Robroyston and filling up en route. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist accustomed to petrol: precisely when it happens. Add a back seat full of children, a phone call or rain, and habit wins.
Blackhill drivers: how to prevent petrol in a diesel next time
- Check the pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on each forecourt. The label is what matters.
- Check the filler flap. Many cars state the fuel type inside the flap or on the cap. Look at it on the first fill in any car you do not know.
- One of each in the home? Mark the key to the diesel — a coloured fob, a sticker — since meaning to remember is not enough.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump. It seems daft and it works.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck your phone away and keep your mind on the pump.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler built to reject a petrol nozzle, and add-on devices are available for vehicles without one. They are a safety net, not a reason to stop checking the petrol pump.
- Noticing it halfway? Stop at once. A thinner mix results from less petrol inside your tank, yet your next step stays the same: don't fire it up.
Already put petrol in a diesel around Blackhill?
Then, there is just a short order of things. Do not fire it up, and don't switch your ignition on. The attendants at the forecourt — whether at JET itself or wherever you filled up — will normally help push it clear of the pump if you ask. Then ring 0333 366 0103 and tell us what went in, about how much, and whether it's run.
Say so if it was AdBlue instead of petrol: it is a separate problem, with its own page for Blackhill, because AdBlue brings corrosion and deposits rather than lost lubrication.
Why one petrol in a diesel task in Blackhill costs more than another
There is no honest single quote for this, because the four scenarios above are four separate tasks. Which of them you're in is mostly what shifts the cost. Where the car is counts too, and whether a van can safely get to it, after the share of petrol to what your tank holds.
Three questions come first, before quoting, rather than after — what got in, how much, has it run — and that is the reason. Those replies are what turn a range into one firm number.
About Blackhill, for a moment
Blackhill is a suburban area situated on the riverside in Glasgow City, with an elevation of around 80 metres. Blackhill lies approximately 2 miles from Glasgow city centre and is surrounded by nearby places such as Riddrie, Provanmill, and Hogganfield. Blackhill has a population of around 3938 people and predominantly features semi-detached housing. Blackhill is located relatively close to the heart of Glasgow, yet is far from London, at a distance of 344.4 miles.
Fuel drain cover across Glasgow City, Blackhill included
Blackhill rests in the G postcode area, and the vans that answer petrol in diesel jobs there work the spots around it as well — Riddrie, Provanmill and Hogganfield among them. The car doesn't need to move to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
At the petrol pump around Blackhill, right now?
Then, you couldn't be in a better spot. Switched off it stays; then ring.