Petrol in a Diesel Car in Harbertonford: How Worried Should You Be?
Likely less than you are now — provided no one has started it. Till the ignition primes the pump, the starter turns, or the vehicle is driven, petrol in a diesel tank simply waits there and does nothing. Which makes the honest reply to the first Harbertonford query — "have I wrecked it?" — normally no. Keep it like that: leave your engine off then phone Petrol in Diesel. What petrol actually does to a diesel, how to gauge how far it's gone, and how to keep it from happening again: that is the rest of this page.
Inside the engine: what petrol in a diesel really does
Passing through an engine, diesel is doing two jobs at once. Lubricating comes before burning; it does both. Built to very fine tolerances, your injectors and the pump rely on the diesel moving through them to keep their surfaces from wearing against one another.
Poorly at the first, not at all at the second: that's petrol. A pump working on a petrol mix is wearing itself out, since petrol is thinner than diesel and strips out the protection your fuel system depends on. Petrol is also made to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that is where the rattling starts.
Taken together, they show the shape the problem takes. Not contact but movement is what does the damage. Where the petrol is only inside that tank, it's a fault of fuel, nothing more. A pump that has been working on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with the fuel to your injectors further on.
Four situations we see in Harbertonford: how serious is petrol in a diesel?
Filled up, and never started: no case is better. Just your tank has petrol in it, so the job is draining that tank and cleaning your system where the vehicle stands. This scenario can only really take place on a forecourt: anywhere else, the vehicle got there by being driven.
A brief spell of running, or merely your ignition on. The system has been primed, so petrol has left that tank and reached the fuel filter and the lines. Drain, flush, see to your filter: still usually simple.
Your pump now spent a couple of miles on thinned fuel — that is what driving it meant. How hard your car was driven matters as much as how far, and this work takes in your tank, your lines, the filter and clean fuel through the whole circuit. Driving the kids to Harbertonford Church of England Primary School is one sort of trip. Any miles on the M5, under 25 miles from Harbertonford, means the engine has worked hard throughout, and a run to Plymouth, under 25 miles away, makes a very different task as well.
Driven on until it complained — rattling, smoke, a lumpy idle, a soft throttle. That is your engine telling you its fuel no longer is acting like diesel. Whether it's the verge on Old Road, a lay-by or a side road, stop where you are then leave it. A car stopped quickly very seldom has long-term damage, as the drain and the flush, which still go first, deal with it.
What Harbertonford motorists get told about petrol in a diesel — and the stories in it
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing is removed when you top up — your tank simply carries more of the same blend. That guidance assumes a diesel fuel system handles petrol by percentage. It does not.
"Modern diesels can handle a little petrol" — a myth, and closer to the opposite. A current diesel sends its fuel through smaller parts at higher pressure, which makes the protection count more, not less.
The myth that catches motorists off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it normally won't run, and so the motorist stops — and the damage stops with them. Feed petrol to a diesel and it normally fires up, ticks over and drives away as if nothing happened — all the while its pump wears. Running is not the same as fine.
Myth: a two-stroke additive lets you to drive home. It was an old workaround, meant for another fault. None of what petrol diluted is put back by it — and later, that tank still holds that petrol.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol sits in the fuel filter and lines, ready to go straight back through your pump on your next start. On top of that, petrol drained into a can by the road is genuinely hazardous.
Why petrol in a diesel occurs at all
It's seldom carelessness, and nobody does it on purpose. 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 generally will not go into a petrol car at all. So the error runs one way.
It occurs when habit and your car stop matching. Hire cars, courtesy cars, and motors that are new to you. Households running one of each, petrol and diesel. Your normal forecourt, its pumps suddenly in a different order. A train to catch, and a rushed fill on the way to Totnes. Years of petrol motors behind you, a diesel Renault Clio in front of you at the forecourt for its first tank — that is when. The hand does what it has always done once you add rain, a phone call or a back seat full of kids.
Next time you fill up around Harbertonford: preventing petrol in a diesel
- Green for unleaded and black for diesel is normal in the UK — yet not on every forecourt. Go by the label on the petrol pump, not the colour.
- Plenty of vehicles state the fuel type inside your filler flap or on the cap, so check there on your first fill in a motor you do not know.
- One of each in the home? Label the key to your diesel — a coloured fob, a sticker — because intending to remember is not enough.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump. It sounds silly and it works.
- Tuck the phone away. This is an easy mistake to make whilst you are thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to block a petrol nozzle, and add-on devices are available for the remainder. Treat it as a backstop, and keep checking the petrol pump.
- Less petrol makes a weaker blend, and so stop as soon as you notice — though remembering that the next stage is unchanged. It is still not to start the vehicle.
Harbertonford: already put petrol in a diesel?
The order of things is brief, then. Don't turn your ignition on, and do not start it. If you're still at the forecourt — TotalEnergies or anywhere else — ask the staff to help you push the vehicle away from the pump. Then phone 0333 366 0103 and tell us what got in, roughly how much, and whether it has run.
If it was AdBlue instead of petrol, say so. That's a separate issue — corrosion and deposits rather than lost lubrication — and it has its own page for Harbertonford.
Why one petrol in a diesel task in Harbertonford costs more than another
There is no fair single quote for this, because the four scenarios above are four separate tasks. The situation itself does most of the work of moving your cost. Where the car is matters too, and whether a van can safely reach it, after the proportion of petrol to what that tank holds.
Three questions come first, before any quote, instead of after — what got in, how much, has it run — and this is the reason. A range becomes a straight figure once those answers are in.
About Harbertonford and its setting
Harbertonford is a small village in Devon, situated on the banks of a river at an elevation of around 35 metres. Harbertonford lies near the villages of Harberton and Halwell, and is approximately 19 miles from Plymouth. Harbertonford has a population of around 568 people, predominantly living in terraced housing. Harbertonford is located in the South West region of England, about 173.9 miles from London.
Harbertonford and Devon: where our fuel drain cover runs
Harberton, Murtwell and Halwell are among the spots near Harbertonford that the same teams work, answering petrol in diesel jobs across Harbertonford's TQ postcode area. The vehicle does not need to move to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
In Harbertonford and still at the pump?
In that case, you couldn't be in a better position. Ring, and leave it switched off.