Should You Worry? Petrol in a Diesel Car in Fullarton
Likely less than you are now — provided no one has started the vehicle. Petrol resting in a diesel tank does nothing to your motor until something draws it through the fuel system — your ignition priming the pump, the starter, or the drive on its own. So the fair answer to the first query everyone around Fullarton asks, "have I wrecked it?", is usually no. Leave the engine off and phone Petrol in Diesel — that keeps it that way. The rest of this page explains 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 motor?
On its way through an engine, diesel has two tasks. It burns, and before it ignites it protects. What keeps the surfaces inside your high-pressure pump and the injectors from wearing down against one another is your diesel passing through them — they're made to extremely fine gaps.
Petrol does the first job poorly and the second not at all. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, leaving a pump on that mixture to wear itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is why you get the rattling.
Combined, those leave the shape of the trouble clear. It is movement that does the harm, not contact. Where that petrol is only inside your tank, it is a problem of fuel, nothing more. The beginning of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with your fuel to your injectors downstream.
How serious is petrol in a diesel? Four situations we see in Fullarton
Fuelled, and never started: nothing beats it. At a forecourt, and really only there, that petrol is still limited to your tank — since everywhere else the vehicle was driven to reach it. The task is draining and rinsing on the spot.
Your ignition switched on, or a brief start. Once primed, the fuel system has drawn petrol from the tank up to the fuel filter and your lines. That's usually still a simple task — a drain, a flush, and your filter dealt with.
Those few miles on the road were your pump running on fuel diluted by petrol throughout. The work is that tank, the lines, the fuel filter and clean fuel through the whole circuit, and how hard the vehicle was driven counts as much as how far. Short trips, like the school run to the local primary school, are one matter. Any miles on the M74, under a mile from Fullarton, means your engine has worked hard throughout, and a run to Glasgow, under 5 miles away, is a very different job too.
It protested, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone ragged. The engine is telling you the fuel is no longer acting like diesel. Pull up where you are — on the verge on Easterhill Street, at the kerb, down a side road — and don't move it again. A car stopped early very seldom has lasting damage, as the fuel drain and the flush, which still come first, deal with it.
Fullarton motorists and the petrol in a diesel stories they hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing is removed when you top up — that tank simply holds more of the same mixture. That guidance supposes a diesel fuel system tolerates petrol by percentage. It doesn't.
"Current diesels can handle a little petrol" — a myth, and closer to the reverse. A newer diesel runs its fuel through more precise parts at higher pressure, which makes the protection matter more, not less.
This is the one that fools motorists. Myth: "If it starts and drives, there is no harm done." Any petrol motor fed diesel normally will not run, so the driver stops and the damage stops with them. While the pump grinds, a diesel fed petrol usually starts, idles and drives away as though nothing has happened. Fine and running aren't the same thing.
Myth: a two-stroke additive makes it safe to drive home. It was an old fix, supposed for another issue. It does not put back what petrol has diluted, and that petrol is still inside the tank later on.
Myth: "Drain that tank yourself and you are sorted." Once the motor has been run, some of that petrol is no longer inside your tank: it is in the filter and the fuel lines, and it goes right back through the pump on the next start. Also, a can of petrol drained by the kerbside is genuinely risky.
How does petrol in a diesel happen?
On purpose? Never. Through carelessness? Rarely, if ever. The forecourt makes it simple: the petrol nozzle is the narrower 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 motor at all. So the slip runs one way.
It occurs when habit and the car stop matching. Any vehicle that is new to you — a hire car, on loan as a courtesy car, or just bought. Households running one of each, petrol and diesel. A forecourt you know, but with its pumps laid out differently. A rushed fill en route to Carmyle with a train to catch. A new-to-you diesel Volkswagen Passat, its first fuelling, and a motorist accustomed to petrol: precisely when it takes place. Your hand does what it has always done once you add rain, a phone call or a back seat full of children.
Next time you fill up around Fullarton: avoiding petrol in a diesel
- The label is what counts, and so check the pump rather than the colour: in the UK unleaded handles are normally green and diesel black, yet not on each forecourt.
- The first fill in an unfamiliar vehicle is the time to check your filler flap — inside it, or on the cap, many cars state the fuel they take.
- Mark your key. In a home with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It seems daft and it does the trick.
- Tuck the phone away. This is an easy mistake to make whilst you are thinking about something else.
- Add-on devices are available for motors without one, and some diesels come with a filler that won't accept a petrol nozzle. Helpful — but a backstop at best, never a reason to stop checking the label.
- Stop the moment you realise. Less petrol in the tank makes a weaker mixture. It does not change what to do next, which is still not to start it.
Put petrol in a diesel around Fullarton already?
Short and simple, then, is the order of things. Starting it is out, and so is switching on your ignition. If you're still at the forecourt — Shell or anywhere else — ask the attendants to help you roll it away from the pump. Call 0333 366 0103 next, with three answers — your fuel, the approximate quantity, and if it's run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a different problem — Fullarton has a page all for it.
Why one petrol in a diesel task in Fullarton costs more than another
The four scenarios above are four different tasks, so no single price for this would be fair. What shifts your cost is chiefly which of them you're in. Two things come after that: the petrol that was put in as a proportion of what your tank holds, then the spot the vehicle is in and whether our van can get to it safely.
What was put in, how much, and whether it's run — three queries our engineers ask before pricing, not after, for precisely that reason. A range becomes a straight figure when the answers are in.
About Fullarton itself
Fullarton is a suburban area located on the riverside in Glasgow City, with a relatively low elevation of 27 metres. Fullarton sits approximately 3.2 miles from Glasgow city centre, within a short distance of nearby places such as Tollcross, Dalbeth, and Sandyhills. Fullarton has a population of around 3497 people, predominantly residing in flat-type housing. Fullarton is situated in a convenient location, with easy access to Glasgow's amenities and services.
Fullarton and Glasgow City: where our fuel drain cover reaches
Petrol in diesel calls around Fullarton — part of the G postcode area — go to vans that also cover the places around it, Tollcross, Dalbeth and Sandyhills among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots our engineers drain, and your car does not need to come to us.
Fullarton: still at the pump?
In that case, you could not be in a better place. Call, and leave it switched off.