Stroud Hill: Petrol in a Diesel Car? How Worried to Be
Probably less than you are now — provided no one has started the car. Everyone around Stroud Hill starts with "have I wrecked it?", and the fair answer is generally no: petrol left inside the tank of any diesel stays harmless until priming, cranking or driving draws it into the system. To leave it that way, ring Petrol in Diesel and leave your 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 never do it again.
Inside your engine: what petrol in a diesel does
Passing through an engine, diesel does two jobs at once. Lubricating comes before burning; it does both. The high-pressure pump and the fuel injectors are designed to very fine clearances, and your diesel passing through them is what stops those surfaces from wearing down against one another.
Of those two jobs, petrol manages the first badly and the second never. The clattering comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips away the protection the fuel system depends on, and any pump running on such a mix is wearing itself.
Taken together, they make clear what shape the problem has. Contact does not do the harm — movement does. Any tank with petrol in it is a fuel issue. The beginning of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds moves on with your fuel to your injectors downstream.
Four situations we see around Stroud Hill: how bad is petrol in a diesel?
Filled up, never started. The best case there can be. Only the tank has petrol in it, and so the task is emptying that tank and cleaning the system where the car stands. This scenario can only really occur on a forecourt: anywhere else, your car got there by being driven.
Ignition on, or started for a moment. The fuel system has been bled, so petrol has left that tank and reached your filter and the lines. Normally little more than emptying, flushing and sorting the fuel filter, so still straightforward.
A couple of miles driven, and the pump has spent each of them labouring on diluted fuel. Tank, lines, filter, then clean fuel run through the whole system: that is the work, and the way your car was driven matters as much as the distance. Short trips, like the school run to Stroud Valley Community Primary School, are one thing. Driving as far as Gloucester, under 10 miles away, makes a very different job — as does any miles on the M5, under 5 miles from Stroud Hill, with the motor running hard the whole time.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone uneven. The fuel isn't acting like diesel any more, and the motor is saying so. Pull up where you are — on the verge on Bisley Old Road, at the kerb, down a side road — and don't move it again. Permanent damage is very uncommon when a car is pulled over soon, and the drain and flush that still come first sort it out.
Myths Stroud Hill people hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing comes out when you top up — your tank simply carries more of the same mixture. A diesel fuel system does not accept petrol by percentage in the way that advice presumes.
"Newer diesels can handle a little petrol" — a myth, and nearer the opposite. Protection matters more on modern diesels, not less, since their fuel passes through finer components at higher pressure.
Myth: "If it starts and drives, there is no harm done." This is the one that fools people. The motorist of a petrol motor fed diesel usually has no choice but to stop, since it will not run, and the harm stops with them. Feed petrol to a diesel and it normally starts, ticks over and pulls away like nothing has happened — all while its pump wears. Being able to run is not proof of being fine.
Myth: "Add some two-stroke oil and drive the car home." It is an outdated workaround for a different issue. None of what petrol weakened is put back by it — and later, that tank still holds that petrol.
If the motor has been run, part of that petrol is in the fuel filter and your lines, not that tank — and the next start sends it right back through the pump. So the myth "drain the tank yourself and you are sorted" does not stand up. Clearing petrol into a can at the roadside is also truly dangerous.
How does petrol in a diesel take place?
It's seldom carelessness, and no one does it on purpose. One way only, because of the nozzles: the slimmer petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly won't fit a petrol car. That's how the forecourt makes it simple.
The moment routine stops matching the car is the moment it takes place. Hire cars, courtesy cars, and motors that are new to you. One petrol and one diesel on the drive of the same household. The pumps in a different order on a well-known forecourt. A hurried fill on the way to Stroud with a train to catch. Exactly the moment it takes place: after years of driving petrol, someone fills a diesel Renault Clio for the first time. Add rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
Stroud Hill drivers: how to avoid petrol in a diesel next time
- Check the pump, not the colour. In the UK unleaded handles are normally green and diesel black, yet not on each forecourt. The label is what counts.
- The first fill in an unfamiliar vehicle is the time to check the filler flap — on it, or on the cap, plenty of motors state which fuel they take.
- One of each in the home? Mark your key to your diesel — a coloured fob, a sticker — since meaning to remember isn't enough.
- "Diesel", aloud, before you lift the nozzle — each time a new or hired car needs its first tank. It sounds daft. It works.
- Whilst you're thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Add-on devices are available for motors without one, and some diesels come with a filler that will not accept a petrol nozzle. Helpful — but a safety net at best, never a reason to stop checking the label.
- Stop as soon as you realise. Less petrol inside that tank means a thinner blend. It does not change what to do next, which is still not to crank it.
Petrol already in a diesel in Stroud Hill? Start here
The order of things is brief, then. Never start it, and don't turn the ignition on. The attendants on the forecourt — whether at BP itself or wherever you filled up — will normally help push it clear of the petrol pump if you ask. What got in, about how much, and whether it has run: tell us that when you phone 0333 366 0103.
Corrosion and deposits are the issue with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and read its own Stroud Hill page.
What makes one Stroud Hill petrol in a diesel job cost more than the next
An honest single price does not exist here: four situations, four separate jobs. Which of them you're in is chiefly what shifts the cost. Where the car is matters too, and whether a van can safely reach it, after the share of petrol to what the tank takes.
What was put in, how much, and if it's run — three questions our engineers ask before costing, not after, for exactly that reason. A range turns into a straight figure once the answers are in.
About Stroud Hill
Stroud Hill is a suburban area located on the outskirts of Gloucester, situated near the riverside in Gloucestershire. Stroud Hill sits at an elevation of around 120 metres, with nearby neighbourhoods including Mount Pleasant, Uplands, and Badbrook. Stroud Hill is characterized by its predominantly semi-detached housing stock, and it is home to a population of approximately 5759 residents. Stroud Hill is also relatively close to major cities, with Gloucester just 8.4 miles away and London around 90.7 miles distant.
Fuel drain cover around Stroud Hill and across Gloucestershire
Petrol in diesel jobs around Stroud Hill — part of the GL postcode area — go to teams that likewise cover the spots about it, Mount Pleasant, Uplands and Badbrook among them. Our engineers drain wherever your vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Still at the pump in Stroud Hill?
Nothing beats it: that's where you are. Leave it turned off, and ring.