Petrol in a Diesel Car in Ashford Hill: How Worried Should You Be?
Probably less than you already are — provided no one has started it. Petrol sitting in a diesel tank does nothing to the motor till something draws it through your fuel system — your ignition priming the pump, your starter, or the drive itself. So the fair answer to the first query anyone in Ashford Hill asks, "have I ruined it?", is normally no. Petrol in Diesel is who to phone, with the motor left off, so it stays that way. What petrol actually does to a diesel, how to judge how far it has gone, and how to stop it from happening a second time: that's the rest of this page.
Inside the engine: what petrol in a diesel does
Passing through an engine, diesel does two jobs at the same time. Lubricating comes before burning; it does both. Extremely fine clearances are built into your injectors and the high-pressure pump, and only the diesel running through keeps their surfaces from grinding together.
Of these two jobs, petrol manages the first badly and the second not at all. Being less viscous than diesel, petrol strips away the lubrication a fuel system needs, so a pump on that mixture to wear itself. It's 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 trouble is plain when you put those together. Not contact but circulation is what does the damage. Any tank with petrol in it is a fuel fault. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with the fuel to the injectors downstream.
How serious is petrol in a diesel? Four scenarios we see around Ashford Hill
The best case there is: filled up, never started. Being on a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With that petrol held in that tank alone, it is emptied and rinsed on the spot, and nothing more is needed.
A brief spell of running, or just your ignition on. Petrol has left the tank and reached your filter and the lines, because the fuel system has been bled. Drain, flush, see to your filter: still normally simple.
Your pump now worked a few miles on thinned fuel — that's what driving it meant. Tank, lines, filter, then fresh fuel run through the whole system: that is this work, and the way the car was driven counts as much as the mileage. Driving the children to Ashford Hill Primary School is one sort of trip. Any mileage on the M4, under 10 miles from Ashford Hill, means your engine working hard throughout, and a run to Winchester, under 25 miles away, is a very different job too.
Driven on until it complained — clattering, smoke, an uneven idle, a soft throttle. That is your engine telling you its fuel has stopped behaving like diesel. Leave it wherever it has stopped: a lay-by, a quiet street, the verge on Little Knowl Hill. What goes first is still the fuel drain and flush, and that sorts it out, with long-term damage very unusual when a car is stopped early.
Stories Ashford Hill drivers hear about petrol in a diesel
Myth: topping up to full with diesel makes it fine. It does not. Nothing is removed by topping up — you're left with a fuller tank, still the same mix. Percentage is not how a diesel fuel system tolerates petrol, whatever that advice presumes.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. A newer diesel runs its fuel through smaller components at higher pressure, which makes the protection count more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that catches motorists. The driver of a petrol motor fed diesel normally stops, because it will not run, and the damage stops with them. Feed petrol to a diesel and it generally fires up, ticks over and drives away like nothing has happened — all the while its pump wears. Being able to run isn't the same as being fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a different problem. What petrol has thinned remains diluted, and the petrol remains in that tank regardless.
If the engine has run, part of the petrol is in the filter and your lines, not your tank — and your next start sends it right back through your pump. So the myth "drain the tank yourself and you are sorted" does not hold. Emptying petrol into a can by the kerbside is also really hazardous.
How it happens: petrol in a diesel
It's rarely carelessness, and no one does it on purpose. One way only, since of the nozzles: the slimmer petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol vehicle. That is how the forecourt makes it simple.
Routine and the vehicle falling out of step is when it happens. Any motor that's new to you — a hire car, on loan as a courtesy car, or brand new. A household with one petrol and one diesel on the drive. The pumps in a different order on a familiar forecourt. A train to catch, and a rushed fill on the way to Midgham. Precisely the moment it happens: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. The hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
Avoiding petrol in a diesel next time you fill up in Ashford Hill
- Green for unleaded and black for diesel is usual in the UK — but not on each forecourt. Go by the label on the petrol pump, not the colour.
- Check the filler flap. Many motors state the fuel inside the flap or on the cap. Look at it on your first fill in a car you do not know.
- One of each in the home? Mark the key to your diesel — a bright fob, a sticker — since intending to remember isn't enough.
- Before the nozzle leaves the pump the first time you fill a hired or new vehicle, say "diesel" out loud. Daft, yes, yet it does the trick.
- Put your phone away. This is an easy mistake to make whilst you're thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler built to block a petrol nozzle, and add-on devices exist for motors without one. They are a safety net, not a reason to stop reading the petrol pump.
- Stop as soon as you notice. Less petrol inside the tank means a thinner blend. It does not change what to do next, which is still not to start it.
Ashford Hill: already put petrol in a diesel?
The order of things is brief, then. Leave it unstarted, with your ignition off too. Yet on the forecourt, at Murrays Service Station or anywhere else? Ask the attendants to help you roll it away from the pump. Then call 0333 366 0103 and tell us what got in, roughly how much, and if it's run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a different problem — Ashford Hill has a page all for it.
One petrol in a diesel job in Ashford Hill costs more than another. Why?
Four separate jobs lie behind the four scenarios above — which is why there's no honest single price. What moves your cost is mostly which of them you are in. Where the car is counts too, and whether a van can safely reach it, after the share of petrol to what that tank holds.
Three questions come first, before quoting, rather than after — what was put in, how much, has it run — and this is the reason. A range becomes a straight figure when the replies are in.
About Ashford Hill and where it is
Ashford Hill is a small village in Hampshire, situated inland at an elevation of around 80 metres. Ashford Hill lies near the larger settlements of Fair Oak and Winchester, and is surrounded by other smaller places such as Wheat Hold and Brimpton Common. Ashford Hill has a population of approximately 611 people, and is characterised by predominantly detached housing. Ashford Hill is located about 47.6 miles from London, making it a rural community within commuting distance of the capital.
Fuel drain cover across Hampshire, Ashford Hill included
Petrol in diesel jobs in Ashford Hill — part of the RG postcode area — go to teams that likewise cover the spots round it, Fair Oak, Wheat Hold and Brimpton Common among them. The vehicle does not need to come to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
At the petrol pump around Ashford Hill, right now?
Then, you could not be in a better spot. Leave it switched off, then ring.