Petrol in a Diesel Car in Arden: How Worried Should You Be?
Provided it has not been started, you can worry less than you likely are. Everyone in Arden begins with "have I ruined it?", and the honest answer is normally no: petrol resting inside your tank of any diesel remains harmless till priming, cranking or driving pulls it into the fuel system. To leave it that way, phone Petrol in Diesel and leave the engine switched off. Read on for three things: the effect petrol has inside a diesel engine, the signs of how far it has got, and ways to make sure you don't do it again.
The engine and petrol in a diesel: what happens
Two jobs fall to diesel on its route through a motor. Before it ignites, it lubricates — then it combusts. Designed to very fine clearances, your injectors and your pump rely on your diesel flowing through them to stop their surfaces wearing against one another.
Badly at the first, not at all at the second: that's petrol. Being less viscous than diesel, petrol strips away the lubrication a fuel system needs, leaving a pump running on that mixture to wear itself. It is also made to resist igniting under compression — the reverse of what a diesel needs — which is why you hear the clattering.
Taken together, they make clear the shape the issue takes. It is movement that does the damage, not contact. Petrol in a tank is a fuel problem. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with the fuel to your injectors downstream.
Four situations our engineers see around Arden: how bad is petrol in a diesel?
Fuelled up, never started. The best case there is. The petrol is in your tank and only the tank, and the task is a drain and a flush where the car stands. This is the one scenario that can only truly happen on a forecourt, since anywhere else the car has been driven to get there.
Started for a moment, or just the ignition on. Petrol has come out of that tank and got to your filter and the fuel lines, since the system has been bled. Normally little more than clearing, cleaning and seeing to the fuel filter, and so still straightforward.
Those few miles on the road were your pump labouring on fuel thinned by petrol the whole way. Tank, lines, filter, then fresh fuel run through the entire system: that is the work, and the way your car was driven counts as much as the mileage. On the school run to the local primary school, the distance is short. Very different once more: a run to Glasgow, under 10 miles away, or any distance on the M77, under a mile from Arden, where the motor kept working hard.
Knocking, an uneven idle, smoke, a throttle gone soft: driven until it complained. That's the engine telling you its fuel has stopped behaving like diesel. Leave it where it has stopped: a lay-by, a quiet street, the verge on Kilmuir Crescent. Permanent damage is very rare if a car is stopped soon, and the drain and flush-through that still go first sort it out.
Arden people and that petrol in a diesel myths they hear
False: topping up to full with diesel makes it fine. It doesn't. Nothing is removed when you top up — your tank just holds more of the same mixture. Percentage is not how a diesel fuel system copes with petrol, whatever that advice presumes.
"Modern diesels can handle a little petrol" — a myth, and closer to the opposite. Lubrication matters more on current diesels, not less, because their fuel runs through more precise components at higher pressure.
One myth that catches drivers out: if it starts and drives, it must be unharmed. The driver of a petrol engine fed diesel normally has no choice but to stop, 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, as it usually will; meanwhile the pump grinds. A running engine doesn't mean fine.
Not so: a two-stroke additive lets you to drive home. It was an old fix, meant for another issue. What petrol has thinned remains thinned, and that petrol remains inside the tank regardless.
"Drain it yourself and you are sorted" — a myth, since after it's been running some petrol sits in the filter and lines, ready to go right back through the pump on your next start. It is also truly risky to drain petrol into a can by the kerbside.
How it happens: petrol in a diesel
It's rarely carelessness, and nobody does it on purpose. One way only, because of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one mostly won't fit a petrol motor. That is how the forecourt makes it straightforward.
The moment routine stops matching the car is the moment it takes place. A new vehicle, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. The pumps in a different order on a familiar forecourt. A rushed fill on the way to Kennishead with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist accustomed to petrol: precisely when it happens. The hand repeats what it has always done when you add rain, a phone call or a back seat full of kids.
Next time you fill up around Arden: avoiding petrol in a diesel
- Green for unleaded and black for diesel is normal in the UK — but not on every forecourt. Go by the label on the pump, not the colour.
- Inspect your filler flap. Many vehicles state the fuel inside the flap or on the cap. Look at it on your first fill in a vehicle you don't know.
- Label the key. In a house with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember.
- It sounds daft and it works: on your first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, so tuck your phone away then keep your mind on the pump.
- Add-on devices exist for motors without one, and some diesels come with a filler that won't take a petrol nozzle. Useful — but a safety net only, never a reason to stop checking the label.
- Stop as soon as you realise. Less petrol in your tank means a weaker mix. It doesn't change what to do next, which is still not to crank it.
Petrol already in a diesel in Arden? Begin here
Then, there's only a short order of things. Do not crank it, and don't switch the ignition on. The attendants on the forecourt — whether at EG On the Move itself or wherever you filled up — will normally help roll it clear of the petrol pump if you ask. Then phone 0333 366 0103 and tell us what went in, roughly how much, and whether it's run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a different fault — Arden has a page just for it.
Arden petrol in a diesel tasks: why one costs more than another
The four situations above are four separate tasks, so no single quote for this would be honest. Which of them you're in is chiefly what moves your cost. The share counts next, meaning how much of the tank is petrol, followed by the location of the vehicle and whether reaching it is safe for a van.
What was put in, how much, and whether it has run — three questions our engineers ask before quoting, not after, for precisely that reason. Those replies are what turn a range into one firm number.
About Arden
Arden is a suburban area situated on the riverside in Glasgow City, with a relatively low elevation of 36 metres. Arden lies approximately 5.3 miles from Glasgow city centre and is surrounded by nearby places such as Kennishead, Darnley, and Thornliebank. Arden is characterised by its predominant housing type, which is mainly flat. Arden is located a significant distance from London, at around 343.2 miles away.
Across Glasgow City and around Arden: fuel drain cover
Petrol in diesel calls in Arden — part of the G postcode area — go to teams that likewise cover the spots around it, Kennishead, Darnley and Thornliebank included. You need not bring the car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots where we work.
Arden: still at the petrol pump?
Nothing beats it: that is where you now are. Keep it off. Phone.