Hatfield Garden Village: Petrol in a Diesel Car? How Worried to Be
Far less than you probably are, provided it has not been started. "Have I wrecked it?" is the first thing anyone in Hatfield Garden Village asks, and the honest answer is generally no, because petrol resting in a diesel tank hurts nothing till it is drawn through your fuel system — by ignition priming, by your starter, or by being driven. Leave the engine off then phone Petrol in Diesel — that is how you keep it like that. Further down, this page sets out what petrol actually does inside a diesel, how far it may have got, and how to stop it happening to you a second time.
What petrol in a diesel does to the engine
Passing through an engine, diesel is doing two things at once. Lubricating comes before burning; it does both. Made to very fine gaps, the fuel injectors and your pump rely on your diesel flowing through them to stop their surfaces wearing against one another.
Petrol does the first job badly and the second not at all. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump running on that mixture wearing itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is why you get the knocking.
The shape of the problem is plain when you put those together. The harm is done by movement, not by contact. All a tank with petrol in it amounts to is a fuel problem. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with the fuel to the fuel injectors downstream.
Hatfield Garden Village, petrol in a diesel: four cases, from mild to significant
Filled but never started — the best it gets. At a forecourt, and truly only there, that petrol is still confined to that tank — since everywhere else the vehicle was driven to get to it. The task is emptying and purging on the spot.
Started for a second, or only the ignition on. The system has been bled, and so petrol has left your tank and got to your filter and the lines. Drain, flush, deal with the fuel filter: still usually easy.
Those few miles driven meant the pump running on fuel diluted by petrol the whole way. Distance is only half of that; how hard it was driven matters equally. Either way the work includes your tank, the fuel lines, the filter and fresh fuel through the entire circuit. The school run to Green Lanes Primary School is one thing. Very different once more: a run to St Albans, under 5 miles away, or some miles on the A1(M), under a mile from Hatfield Garden Village, where the motor kept working hard.
Driven until it complained. Rattling, a lumpy idle, smoke, a throttle that has gone soft. That's the engine telling you its fuel has stopped behaving like diesel. Stop wherever you are — the verge on The Ferns, a lay-by, a side street — then leave it where it is. What comes first is still the fuel drain and flush-through, and that deals with it, with long-term damage very rare when a car is stopped early.
Hatfield Garden Village people and the petrol in a diesel myths they hear
Myth: topping up to full with diesel makes it fine. It does not. Topping up takes out nothing; it gives you a fuller tank of the same mix. That advice supposes a diesel fuel system tolerates petrol by percentage. It doesn't.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the reverse. At higher pressure, through finer components: that's how a modern diesel moves its fuel, and so the lubrication matters for more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that catches motorists. A petrol engine fed diesel usually won't run, and so the motorist stops and the damage stops with them. Feed petrol to a diesel and it usually fires up, idles and pulls away as if nothing has happened — all the while its pump is wearing. Running does not mean fine.
An old fix for a separate issue lies behind this one. Myth: "Add some two-stroke oil and drive the car home." The petrol is still in your tank afterwards, and whatever it has diluted isn't put back.
"Drain it yourself and you're sorted" — a myth, because after it has been running some petrol lies in the fuel filter and lines, ready to go straight back through your pump on the next start. It is also truly risky to drain petrol into a can by the kerbside.
Petrol in a diesel: how does it happen?
Carelessness is seldom the cause, and no one means to do it. The forecourt makes it simple: the petrol nozzle is the smaller of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle mostly won't go into a petrol car at all. So the slip runs one way.
The moment routine stops matching the car is the moment it occurs. Hire cars, courtesy cars, and vehicles that are new to you. Households running one of each, petrol and diesel. The pumps in a different order on a well-known forecourt. Filling up in a rush en route to Hatfield, with a train to catch. Years of petrol cars behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that's when. With rain, a call coming in, or a car full of children to deal with, the hand just does what it always has.
How to avoid petrol in a diesel at your next fill-up around Hatfield Garden Village
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most usually do. Check the petrol pump's label; the colour is just a clue.
- In a vehicle you don't know, look inside the flap over the filler or at the cap before the first fill: many cars print the fuel type there.
- Good intentions do less than a sticker or a fob in a vivid colour on the diesel's key when a house has one of each. So mark it.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the petrol pump. It sounds silly and it does the trick.
- Put the phone away. This is an easy mistake to make while you are thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to refuse a petrol nozzle, and add-on devices exist for cars without one. They are a safety net, not a reason to stop checking the pump.
- As soon as you realise, stop: less petrol in the tank means a thinner blend. What to do next doesn't change, though — still don't start the car.
Already put petrol in a diesel in Hatfield Garden Village?
Short and simple, then, is the order of things. Leave it unstarted, with the ignition switched off as well. If you are still on the forecourt — the nearest petrol station or anywhere else — ask the attendants to help you roll the car clear of the petrol pump. Next, 0333 366 0103. We'll ask what went in, about how much, and if it has been run.
Say so if it was AdBlue instead of petrol: it is a different issue, with its own page for Hatfield Garden Village, since AdBlue brings corrosion and deposits rather than lost lubrication.
What makes one Hatfield Garden Village petrol in a diesel job cost more than the next
There's no fair single quote for this, because the four situations above are four different jobs. Chiefly, the cost moves with which situation you are in. The share counts next, meaning how much of your tank is petrol, and then the location of the car and whether reaching it is safe for our van.
Three questions come first, before any quote, instead of after — what was put in, how much, has it run — and this is the reason. Given those replies, you get a straight figure rather than a range.
About Hatfield Garden Village, for a moment
Hatfield Garden Village is a suburban area located in Hertfordshire, situated approximately 19 miles north of London and 4.6 miles east of St Albans. Hatfield Garden Village sits at an elevation of around 78 metres, in a gently sloping inland area surrounded by other residential neighbourhoods such as Birchwood and The Ryde. Hatfield Garden Village has a population of around 2938 people, predominantly living in semi-detached housing. Hatfield Garden Village is also near Stanborough, a nearby area of natural beauty.
Fuel drain cover across Hertfordshire, Hatfield Garden Village included
Petrol in diesel calls in Hatfield Garden Village — part of the AL postcode area — go to vans that likewise cover the spots round it, Birchwood, The Ryde and Stanborough among them. The vehicle doesn't need to come to us: we drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
Still at the petrol pump in Hatfield Garden Village?
In that case, you could not be in a better place. Keep the vehicle turned off, and ring.