Should You Worry? Petrol in a Diesel Car in Aston
Far less than you probably are, provided it hasn't been started. Everyone in Aston starts with "have I wrecked it?", and the fair answer is generally no: petrol left in the tank of a diesel stays harmless until priming, cranking or driving draws it into the system. Leave the motor off and call Petrol in Diesel — that is how you keep it like that. Read on for three things: the effect petrol has inside a diesel motor, the clues of how far it has spread, and the way to make sure you don't repeat it.
Inside the motor: what petrol in a diesel really does
Passing through an engine, diesel does two things at once. It ignites, and before it combusts it lubricates. Designed to very fine gaps, the fuel injectors and your pump depend on the diesel flowing through them to keep their surfaces from wearing against one another.
The second job petrol doesn't do at all, and the first it does poorly. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump on the mixture wearing 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 issue is clear once you put those together. Contact does not do the damage — movement does. Where the petrol is only in that tank, it's an issue of fuel, nothing more. After the pump has been working on that petrol, a mechanical issue has started: whatever is shed by a pump that's wearing down is carried downstream to the injectors with the fuel.
Four situations our engineers see in Aston: how bad is petrol in a diesel?
Filled up, and never started: nothing beats it. That petrol is inside that tank and only your tank, and the task is a drain and a flush where the vehicle stands. This is the one situation that can only truly happen on a forecourt, because anywhere else the vehicle has been driven to get there.
Ignition on, or started for a second. With the fuel system primed, the lines and filter now contain petrol that has come from the tank. That's generally still a straightforward job — a drain, a flush, and your filter seen to.
Driven a few miles. Now your pump has spent these miles running on thinned fuel. Distance is only half of that; how hard it was driven counts equally. Either way the work includes your tank, the fuel lines, your filter and clean fuel through the whole circuit. Driving the children to Aston Tower Community Primary School is one kind of trip. Any distance on the Aston Expressway, under a mile from Aston, means the engine has worked hard throughout, and a run to Birmingham, under 3 miles away, makes a very different task as well.
Driven till it complained. Rattling, an uneven idle, smoke, a throttle that has gone soft. The fuel isn't acting like diesel any more, and the motor is telling you. Stop wherever you are — the verge on Park Circus, a lay-by, a side street — and leave it there. What comes first is still the drain and flush, and that deals with it, with permanent damage very unusual if a car is stopped quickly.
Aston people and that petrol in a diesel stories they hear
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing is removed by topping up — you are left with a bigger tank, still the same mixture. That guidance assumes a diesel fuel system tolerates petrol by percentage. It doesn't.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through finer components: that is how a modern diesel moves its fuel, so the lubrication counts for more, not less.
This is the one that catches drivers. Myth: "If it starts and drives, there's no damage done." Diesel in a petrol motor normally leaves a motor that will not run: the driver stops, and so does the harm. A diesel fed petrol generally starts, ticks over and drives away as though nothing has happened, whilst your pump wears. Running isn't the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate problem. That petrol is still inside your tank after that, and what it has weakened is not put back.
If the engine has run, part of that petrol is in the filter and your lines, not your tank — and your next start pulls it right back through your pump. So the myth "drain the tank yourself and you are sorted" doesn't stand up. Besides, petrol drained into a can by the road is genuinely risky.
Petrol in a diesel: how does it take place?
It is seldom carelessness, and no one does it on purpose. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle generally won't go into a petrol car at all. So the error runs one way.
The moment routine stops matching the vehicle is the moment it takes place. Hire cars, courtesy cars, and vehicles that are new to you. Two motors on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A train to catch, and a hurried fill on the way to the nearest station. The first fill-up in a diesel Volkswagen Passat after years of driving petrol is precisely the moment it occurs. The hand repeats what it has always done once you add rain, a phone call or a back seat full of children.
How to prevent petrol in a diesel at your next fill-up around Aston
- Read the petrol pump, not the colour. In the UK unleaded handles are generally green and diesel black, but not on each forecourt. The label is what matters.
- The first fill in a new car is the time to check the filler flap — inside it, or on the cap, plenty of motors state the fuel to use.
- Mark your key. In a home with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- Before the nozzle leaves the petrol pump the first time you fill a hired or new car, say "diesel" out loud. Daft, perhaps, but it does the trick.
- Mistakes like this are easy to make while your mind is on something else, so your phone goes away.
- Some diesels have a filler built to block a petrol nozzle, and devices you can add exist for motors without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump.
- The moment you realise, stop: less petrol inside the tank makes a thinner blend. What to do next doesn't change, though — still don't fire it up.
Already put petrol in a diesel around Aston?
Then the order of things is brief. Never crank it, and don't switch the ignition on. The attendants at the forecourt — whether at Gulf itself or wherever you filled up — will normally help roll it clear of the pump if you ask. Ring 0333 366 0103 next, with three facts — your fuel, the approximate volume, and whether it has run.
Say so if it was AdBlue instead of petrol: it's a separate fault, with its own page for Aston, since AdBlue brings corrosion and deposits rather than lost lubrication.
One petrol in a diesel task in Aston costs more than another. Why?
The four situations above are four separate jobs, so no single price for this would be fair. Which of them you're in is chiefly what shifts your cost. Where the vehicle is matters too, and whether a technician can safely reach it, after the proportion of petrol to what your tank holds.
Before any quote, not after, come three questions: your fuel that got in, its amount, and if it's run. That's why. Their replies are what change a range into one firm number.
About Aston and where it is
Aston is a suburban area in the West Midlands, situated on the River Rea and close to the city centre of Birmingham. Aston sits at an elevation of around 120 metres, with terraced housing being the predominant type of accommodation in the area. Aston is located near other local areas such as Aston New Town, Birchfield, and New Town Row, and is home to a population of approximately 6345 people.
Fuel drain cover in Aston and across West Midlands
The teams answering petrol in diesel call-outs in Aston, in the B postcode area, equally work the spots near it, Aston New Town, Birchfield and New Town Row among them. We drain where the vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
In Aston and still at the pump?
No position is better: that's where you are. Switched off it stays; then ring.