Petrol in a Diesel Car in Blairdardie: How Worried Should You Be?
Unstarted? Then less worried than you likely are. Until your ignition primes the pump, your starter turns, or your car is driven, petrol in a diesel tank just sits there and does no harm. Which makes the honest reply to the first Blairdardie question — "have I wrecked it?" — normally no. Leave your motor off then phone Petrol in Diesel — that keeps it like that. Keep reading for three things: the effect petrol has inside a diesel motor, the clues of how far it has got, and the way to make sure you never repeat it.
Petrol in a diesel: what does it do to your engine?
Passing through an engine, diesel does two jobs at the same time. It lubricates first, and only then does it burn. Your high-pressure pump and the injectors are built to extremely fine tolerances, and your diesel passing through them is what stops those surfaces from wearing against one another.
Of those two tasks, petrol handles the first badly and the second not at all. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump running on the mixture to wear itself. It is also made to resist igniting under compression — the reverse of what a diesel needs — which is why you get the clattering.
The shape of the issue is plain when you put those together. The damage is done by circulation, not by contact. Any tank with petrol in it is a fuel fault. The start of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds moves on with your fuel to the injectors beyond it.
Petrol in a diesel around Blairdardie: how serious is it? Four cases
Fuelled, and never started: nothing beats it. At a forecourt, and truly only there, the petrol is still limited to that tank — since everywhere else the car was driven to get to it. The task is emptying and purging on the spot.
A moment's running, or merely your ignition on. Petrol has left the tank and reached the fuel filter and your lines, because the fuel system has been bled. Drain, flush, see to the filter: still normally simple.
Those few miles driven were the pump working on fuel thinned by petrol the whole way. How hard the car was driven counts as much as how far, and this work takes in your tank, the lines, the fuel filter and clean fuel through the entire circuit. On the school run to the local primary school, the mileage is short. Getting as far as Glasgow, under 10 miles away, makes a very different job — as does any distance on the M8, under 3 miles from Blairdardie, with the motor working hard all the way.
Driven on till it protested — knocking, smoke, a ragged idle, a dead throttle. What you are hearing is the motor signalling fuel that no longer runs like diesel. Leave it wherever it has stopped: a lay-by, a quiet street, the verge on Blairdardie Drive. Long-term damage is very unusual when a car is stopped soon, and the fuel drain and flush-through that still come first sort it out.
What Blairdardie motorists get told about petrol in a diesel — and the myths in it
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing is removed by topping up — you are left with a fuller tank, still the same mix. A diesel fuel system doesn't tolerate petrol by percentage in the way that advice assumes.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. A current diesel runs its fuel through more precise components at higher pressure, which makes the lubrication matter more, not less.
One myth that catches drivers out: if it starts and drives, it must be unharmed. Diesel in a petrol motor generally means a motor that will not run: the motorist stops, and so does the harm. Whilst your pump grinds, a diesel fed petrol normally starts, idles and drives away as if nothing has happened. Running doesn't mean fine.
Myth: "Add some two-stroke oil and drive the car home." It is an outdated fix for a separate problem. What petrol has diluted stays weakened, and that petrol stays inside the tank regardless.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol sits in your filter and lines, waiting to go right back through the pump on the next start. Emptying petrol into a can by the roadside is also really risky.
How it happens: petrol in a diesel
Carelessness is seldom the cause, and no one means to do it. A diesel nozzle generally won't fit a petrol motor, but the smaller petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake simple, and only in one direction.
Routine and the car getting out of step is how it takes place. A new car, a hire car or a courtesy car. Two vehicles on one drive, one petrol, one diesel. A forecourt you know, but with its pumps arranged differently. A rushed fill on the way to Drumchapel with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist used to petrol: exactly when it happens. With rain, a call coming in, or children to deal with, the hand just does what it has always done.
How to avoid petrol in a diesel at your next fill-up in Blairdardie
- The label is what matters, so read the pump rather than the colour: in the UK unleaded handles are usually green and diesel black, yet not on each forecourt.
- Check your filler flap. Many vehicles state the fuel type inside the flap or on the cap. Look at it on your first fill in any motor you do not know.
- Good intentions do less than a sticker or a fob in a bright colour on your diesel's key if a household has one of each. So mark it.
- "Diesel", aloud, before you lift the nozzle — every time a new or hired car needs its first tank. It sounds silly. It does the trick.
- Put your phone away. This is an easy mistake to make while you're thinking about something else.
- Some diesels have a filler built to reject a petrol nozzle, and devices you can add are available for motors without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop checking the pump.
- Noticing it mid-fill? Stop at once. A weaker mixture follows from less petrol in that tank, but the next stage remains the same: don't start the car.
Petrol already in a diesel around Blairdardie? Begin here
Then the order of things is short. Don't start it, and do not switch the ignition on. The staff on the forecourt — whether at Sainsbury's itself or wherever you filled up — will normally help push it away from the pump if you ask. Next, 0333 366 0103. We'll ask what was put in, about how much, and if it has been run.
Say so if it was AdBlue instead of petrol: it's a separate fault, with its own page for Blairdardie, because AdBlue brings corrosion and deposits instead of lost protection.
One petrol in a diesel job around Blairdardie costs more than another. Why?
There is no honest single quote for this, because the four situations above are four different tasks. What shifts the cost is chiefly which of them you are in. Next it's the proportion — how much petrol was put in against how much the tank takes — and then where the car is and whether a technician can get to it safely.
Before any quote, not after, come three questions: your fuel that got in, its quantity, and if it has run. That's why. Given those answers, there is a straight figure instead of a range.
About Blairdardie
Blairdardie is a suburban area in Glasgow City, situated near the River Clyde at an elevation of 24 metres. Blairdardie lies approximately 5 miles northwest of Glasgow city centre, within a short distance of nearby places such as Old Drumchapel and High Knightswood. Blairdardie is predominantly composed of flat-type housing, which is typical of many suburban areas in Glasgow. Blairdardie has a population of around 6495 residents, according to approximate estimates.
Blairdardie and Glasgow City: where our fuel drain cover reaches
Our vans answering petrol in diesel calls around Blairdardie, in the G postcode area, also work the spots near it, Old Drumchapel, High Knightswood and Drumchapel among them. A forecourt, a supermarket car park, a lay-by or your own drive are all spots our engineers drain, and your car does not need to come to us.
Blairdardie: still at the pump?
The best position there is, then — that is where you are. Phone, and leave it switched off.