Petrol in a Diesel Car in Hodge Lea: How Worried Should You Be?
Less than you likely are, if it has not been started. Till the ignition primes your pump, your starter cranks, or the car is driven, petrol in a diesel tank just rests there and does no harm. Which makes the truthful reply to the first Hodge Lea query — "have I wrecked it?" — normally no. Leave your engine off then ring Petrol in Diesel — that is how you keep it like that. Read on for three things: the effect petrol has inside a diesel engine, the clues of how far it has spread, and the way to make sure you don't repeat it.
Petrol in a diesel: what does it do to the engine?
Diesel has two tasks on its way through an engine. It lubricates to begin with, and only then does it burn. Extremely fine clearances go into the fuel injectors and the high-pressure pump, and just the diesel flowing through keeps those surfaces from grinding together.
The second task petrol doesn't do at all, and the first it does poorly. The clattering comes from petrol being designed not to ignite when compressed, which is precisely the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips out the lubrication the system hinges on, and any pump running on such a mixture is wearing itself.
Combined, those make the shape of the problem clear. Contact doesn't do the damage — circulation does. Petrol in a tank is a fuel issue. The beginning of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds travels on with the fuel to the fuel injectors downstream.
Four scenarios our engineers see around Hodge Lea: how bad is petrol in a diesel?
Filled up, not once started. The best case there is. The petrol is inside your tank and just your tank, and the job is a drain and a flush where the car stands. This is the one scenario that can only truly occur at a forecourt, since anywhere else your car has been driven to get there.
A brief spell of running, or merely the ignition on. With the system primed, your lines and filter now hold petrol that has come from that tank. Drain, flush, see to the filter: still usually straightforward.
Those few miles on the road were the pump working on fuel weakened by petrol the whole way. Distance is only half of it; how hard it was driven counts just as much. Either way this work runs to that tank, your lines, the filter and fresh fuel through the entire circuit. Short trips, like the school run to Greenleys First School, are one matter. A run as far as Milton Keynes, under 3 miles away, is a very different job. So is any mileage on the M1, under 5 miles from Hodge Lea, where the engine has been running hard throughout.
It protested, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone uneven. What you are hearing is the motor reporting fuel that no longer acts like diesel. Whether it's the verge on Hodge Lea Lane, a lay-by or a side street, stop where you are then leave it. A vehicle stopped early very seldom has long-term damage, as the drain and the flush, which still go first, deal with it.
Stories Hodge Lea motorists hear about petrol in a diesel
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing is removed by topping up — you're left with a fuller tank, still the same mixture. A diesel fuel system does not accept petrol by percentage in the way that guidance presumes.
Not so: a current diesel copes with a bit of petrol. If anything, the reverse. Lubrication counts more on current diesels, not less, since their fuel passes through smaller components at higher pressure.
Myth: "If it starts and drives, there is no harm done." This is the one that catches motorists. A petrol motor fed diesel normally won't run, and so the driver stops and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile your pump wears. Running doesn't mean fine.
Myth: "Add some two-stroke oil and drive the car home." It is an old workaround for a separate issue. None of what petrol thinned is put back by it — and later, the tank still contains the petrol.
Myth: "Drain the tank yourself and you are sorted." Once the engine has been run, some of the petrol is no longer in the tank: it is in your filter and your lines, and it goes straight back through the pump on your next start. It is also really dangerous to drain petrol into a can by the kerbside.
How petrol ends up: petrol in a diesel
A careless moment is rarely the cause, and nobody means to do it. The petrol nozzle is the smaller of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol motor at all. The forecourt makes it simple, and the error runs one way.
It happens when habit and the car stop matching. Courtesy car, hire car, or a motor that is brand new. One petrol and one diesel on the drive of the same household. A familiar forecourt with the pumps in a different order. Rushing for a train outside Wolverton and fuelling up en route. The first fill-up in a diesel Renault Megane after years of driving petrol is exactly the moment it happens. With rain, a call arriving, or children to deal with, your hand simply does what it has always done.
Hodge Lea motorists: how to prevent petrol in a diesel next time
- A green handle for unleaded and black for diesel is normal in the UK — but not on every forecourt. Trust the label on the petrol pump, not the colour.
- Plenty of vehicles state the fuel inside the filler flap or on the cap, and so check it on your first fill in any car you don't know.
- One of each in the house? Label your key to your diesel — a coloured fob, a sticker — since intending to remember is not enough.
- Before the nozzle comes off the petrol pump the first time you fill a hired or new car, say "diesel" out loud. Daft, perhaps, yet it does the trick.
- Mistakes like this are easy to make whilst your mind is on something else, and so your phone goes away.
- Add-on devices exist for motors without one, and some diesels are built with a filler that won't accept a petrol nozzle. Useful — but a backstop at best, never a reason to stop checking the label.
- Stop as soon as you notice. Less petrol in the tank makes a thinner mix. It doesn't change what to do next, which is still not to fire it up.
Already put petrol in a diesel in Hodge Lea?
The order of things is short, then. Don't start the car, and don't switch your ignition on. If you are still on the forecourt — BP or anywhere else — ask the staff to help you push the vehicle clear of the pump. Ring 0333 366 0103 next, with three answers — your fuel, the approximate volume, and if it's run.
Say so if it was AdBlue rather than petrol: it's a different problem, with its own page for Hodge Lea, because AdBlue brings corrosion and deposits rather than lost protection.
What makes one Hodge Lea petrol in a diesel job cost more than the next
The four situations above are four separate jobs, so no single quote for this would be honest. What shifts the cost is mostly which of them you're in. Where the car is matters too, and whether a technician can safely reach it, after the ratio of petrol to what your tank takes.
What got in, how much, and if it's run — three questions our engineers ask before pricing, not after, for precisely that reason. Those answers are what change a range into one firm number.
About Hodge Lea, briefly
Hodge Lea is a suburban area in Buckinghamshire, situated near the city of Milton Keynes and approximately 47.7 miles northwest of London. Hodge Lea sits at an elevation of around 99 metres, in a landscape of gentle hills and valleys. Hodge Lea is characterized by its predominantly terraced housing and is located near other suburban areas such as Stacey Bushes and Greenleys.
Hodge Lea and Buckinghamshire: where our fuel drain cover runs
Petrol in diesel call-outs in Hodge Lea — part of the MK postcode area — go to vans that also cover the places around it, Stacey Bushes, Greenleys and Two Mile Ash included. A forecourt, a supermarket car park, a lay-by or your own drive are all places our engineers drain, and your vehicle doesn't need to move to us.
Still at the petrol pump in Hodge Lea?
The best position there is, then — that is where you are. Phone, and keep it turned off.