Holmfirth: Petrol in a Diesel Car? How Worried to Be
Not started? Then less anxious than you likely are. Everyone around Holmfirth begins with "have I ruined it?", and the honest answer is normally no: petrol left in the tank of a diesel stays harmless till priming, cranking or driving draws it into your fuel system. Leave your engine off and phone 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.
What petrol in a diesel does to your engine
Two jobs fall to diesel on its route through a motor. It ignites, and before it burns it lubricates. The high-pressure fuel pump and your injectors are built to very fine tolerances, and the diesel passing through them is what stops those surfaces from wearing against each other.
Petrol does the first task poorly and the second not at all. A pump working on a petrol blend is wearing itself out, because petrol is runnier than diesel and takes away the protection the fuel system depends on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that is where the rattling starts.
Together, those make the shape of the trouble plain. The damage is done by circulation, not by contact. Where the petrol is only inside your tank, it's an issue of fuel, nothing more. The start of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds moves on with your fuel to the fuel injectors beyond it.
Holmfirth, petrol in a diesel: four situations, from mild to serious
Filled up, never started. The best case there can be. That petrol is in that tank and only your tank, and the job is a drain and a flush where your car sits. This is the one scenario that can only truly happen at a forecourt, since anywhere else your car has been driven to get there.
Your ignition turned on, or a short start. Once primed, the fuel system has drawn petrol out of that tank as far as the filter and the lines. Normally little more than draining, cleaning and sorting the fuel filter, and so still easy.
A couple of miles driven, and the pump has spent each of them labouring on weakened fuel. How hard your car was driven matters as much as how far, and this work covers that tank, your lines, your filter and fresh fuel through the whole system. On the school run to Holmfirth Junior Infant and Nursery School, the distance is short. Any miles on the M62, under 10 miles from Holmfirth, means the engine has worked hard throughout, and a run to Wakefield, under 15 miles away, makes a very different job as well.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone ragged. What you are hearing is the motor reporting fuel that no longer behaves like diesel. Leave it wherever it has stopped: a lay-by, a side street, the verge on Victoria Street. What comes first is still the fuel drain and flush-through, and that deals with it, with long-term damage very rare if a vehicle is pulled over early.
Myths Holmfirth drivers hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Nothing is removed by topping up — you are left with a fuller tank, still the same mix. That guidance assumes a diesel fuel system tolerates petrol by percentage. It does not.
Myth: a modern diesel copes with a bit of petrol. Rather, the opposite. More precise components and higher pressure are the way a current diesel runs its fuel, and that makes the lubrication count more, not less.
This is the one that fools people. Myth: "If it starts and drives, there's no harm done." Feed diesel to a petrol motor and it generally will not run, and so the driver stops — and the harm stops with them. A diesel fed petrol generally starts, ticks over and drives away as though nothing has happened, whilst your pump grinds. Being able to run is not the same as being fine.
An outdated fix for a separate problem lies behind this one. Myth: "Add some two-stroke oil and drive the car home." What petrol has diluted remains weakened, and that petrol remains inside that tank regardless.
The next start draws petrol back round your pump from your lines and the filter, where some of it sits after your engine has run. That's why a DIY tank drain does not leave you sorted — a myth. Also, a can of petrol drained at the kerbside is truly dangerous.
Petrol in a diesel: how does it occur?
On purpose? Never. Through carelessness? Rarely, if ever. One way only, since of the nozzles: the smaller petrol one slips inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol car. That is how the forecourt makes it simple.
Routine and the vehicle getting out of step is how it occurs. Hire cars, courtesy cars, and vehicles that are new to you. Two vehicles on one drive, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A train to catch, and a rushed fill en route to Brockholes. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you at the forecourt for its first tank — that is when. Throw in a back seat full of children, a phone call or rain, and the hand wins.
Preventing petrol in a diesel next time you fill up in Holmfirth
- The label is what counts, and so read the petrol pump instead of the colour: in the UK unleaded handles are usually green and diesel black, yet not on every forecourt.
- In a vehicle you do not know, look inside the flap over your filler or at the cap before the first fill: plenty of vehicles state the fuel type there.
- Good intentions count for less than a sticker or a fob in a vivid colour on the diesel's key if a household has one of each. So label it.
- It sounds silly and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump.
- Tuck the phone away. This is an easy mistake to make whilst you're thinking about something else.
- Some diesels come with a filler designed to block a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the petrol pump.
- Spotting it mid-fill? Stop there and then. A weaker mix results from less petrol inside the tank, yet your next step stays the same: don't crank it.
Holmfirth: already put petrol in a diesel?
Short and simple, then, is the order of things. Leave it unstarted, with the ignition switched off as well. The staff at the forecourt — whether at Murco itself or wherever you filled up — will normally help push it clear of the pump if you ask. What went in, roughly how much, and whether it's run: tell us those when you ring 0333 366 0103.
Say so if it was AdBlue rather than petrol: it is a different problem, with its own page for Holmfirth, because AdBlue brings corrosion and deposits rather than lost protection.
Why one petrol in a diesel task around Holmfirth costs more than another
There is no fair single quote for this, since the four situations above are four separate tasks. What moves your cost is mostly which of them you're in. Two things come after that: the petrol that was put in as a share of what your tank holds, then the spot your car is in and whether a technician can get to it safely.
That is why our technicians ask three queries before costing instead of after: what got in, how much, and if it's run. The replies turn a range into a straight figure.
About Holmfirth itself
Holmfirth is a town situated in the Holme Valley in West Yorkshire, with the River Holme running through it. Holmfirth sits at an elevation of 151 metres, surrounded by hills and scenic countryside. Holmfirth has a mix of old and new buildings, including many detached houses, and is located near several smaller communities such as Under Hill and New Town. Holmfirth is approximately 14 miles from Wakefield and 159 miles from London.
Fuel drain cover across West Yorkshire, Holmfirth included
Under Hill, New Town and Hill are among the spots near Holmfirth that the same vans work, answering petrol in diesel calls across Holmfirth's HD postcode area. Our engineers drain wherever your vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
In Holmfirth and still at the pump?
Then you're in the best place there can be. Keep the vehicle turned off, and ring.