Petrol in a Diesel Car in Troy Town: How Worried Should You Be?
Provided it has not been started, worry far less than you likely are. Petrol sitting in a diesel tank does nothing to the motor till something pulls it through the fuel system — the ignition priming the pump, your starter, or driving on its own. So the honest answer to the first query anyone in Troy Town asks, "have I ruined it?", is normally no. Keep it like that: leave the motor off then phone Petrol in Diesel. The rest of this page sets out what petrol really does to a diesel, how to tell how far it has got, and how to make sure it doesn't happen to you again.
Petrol in a diesel: what does it do to the motor?
Two jobs fall to diesel on its route through a motor. It protects to begin with, and after that does it burn. The high-pressure pump and your injectors are built to extremely fine tolerances, and the diesel passing through them is what keeps those surfaces from grinding against each other.
Of those two jobs, petrol handles the first badly and the second not at all. A pump working on a petrol blend is wearing itself out, because petrol is thinner than diesel and strips out the protection the fuel system relies on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that is where the clattering comes.
Put these together and the shape of the problem is plain. Contact doesn't do the damage — movement does. Petrol in the tank is a fuel fault. A pump that has been labouring 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.
How bad is petrol in a diesel? Four scenarios our engineers see in Troy Town
Fuelled, and never started: no case is better. Only the tank has petrol in it, and so the job is draining the tank and cleaning the fuel system where the vehicle stands. This situation can only truly occur on a forecourt: anywhere else, your car got there by being driven.
Ignition on, or started for a moment. Petrol has come out of the tank and reached the filter and your lines, since the system has been primed. That is normally still a straightforward task — a drain, a flush, and the filter dealt with.
A couple of miles driven, and your pump has spent every one of them labouring on weakened fuel. Tank, lines, filter, then clean fuel run through the entire system: that is this work, and the way the vehicle was driven matters as much as the mileage. The school run to St Margaret's at Troy Town CofE Voluntary Controlled Primary School is one thing. Any miles on the M2, under 3 miles from Troy Town, means your engine working hard throughout, and a run to Southend-on-Sea, under 15 miles away, makes a very different task as well.
Knocking, an uneven idle, smoke, a throttle gone soft: driven until it complained. What you are hearing is your engine signalling fuel that no longer runs like diesel. Whether it is the verge on Hoopers Road, a lay-by or a side street, stop where you are then leave it. Lasting damage is very rare if a car is stopped early, and the fuel drain and flush-through that still go first sort it out.
Myths Troy Town drivers hear about petrol in a diesel
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Nothing comes out when you top up — your tank simply carries more of the same mixture. Percentage is not how a diesel fuel system copes with petrol, whatever that advice supposes.
"Current diesels can handle a little petrol" — a myth, and nearer the opposite. At higher pressure, through more precise parts: that is how a current diesel moves its fuel, so the lubrication counts for more, not less.
"It starts, it drives, so no harm done" — the myth that catches more drivers than any other. The motorist of a petrol engine fed diesel normally stops, because it will not run, and the damage stops there. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile your pump wears. Being able to run isn't proof of being fine.
Not so: a two-stroke additive lets you to drive home. It was an old fix, supposed for another issue. The petrol is still inside your tank after that, and what it has thinned is not put back.
The next start sends petrol back round your pump out of the fuel lines and the filter, where some of it ends up once the engine has been run. That is why a DIY tank drain doesn't sort it — a myth. Emptying petrol into a can by the kerbside is also genuinely risky.
Petrol in a diesel: how does it take place?
On purpose? Never. Through carelessness? Seldom, if ever. A diesel nozzle generally won't fit a petrol car, but the smaller petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one mistake simple, and only in one direction.
When habit and the vehicle stop matching, it happens. A motor that's new to you — hired, on loan as a courtesy car, or brand new. One petrol and one diesel on the drive of the same household. Your ordinary forecourt, its pumps suddenly in a different order. A hurried fill en route to Rochester with a train to catch. A new-to-you diesel Volkswagen Passat, its first fuelling, and a driver used to petrol: precisely when it takes place. Add rain, a phone call or a back seat full of children, and your hand repeats what it has always done.
How to prevent petrol in a diesel on your next fill-up in Troy Town
- The label is what matters, so check the petrol pump rather than 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 the filler or at the cap before your first fill: plenty of vehicles state the fuel there.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, for a home with one of each.
- Before the nozzle comes off the petrol pump the first time you fuel a hired or new car, say "diesel" aloud. Daft, perhaps, but it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, so tuck your phone away and keep your mind on the petrol pump.
- Some diesels come with a filler designed to reject a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump.
- Stop as soon as you realise. Less petrol in the tank means a thinner blend. It does not change what to do next, which is still not to start the car.
Troy Town: already put petrol in a diesel?
The order of things is brief, then. Leave it unstarted, with your ignition off too. Ask the staff to help you roll it clear of the pump if you are still at the forecourt, whether that's Morrisons or somewhere else. What went in, roughly how much, and whether it's run: tell us those when you call 0333 366 0103.
Say so if it was AdBlue rather than petrol: it is a different problem, with its own page for Troy Town, because AdBlue brings corrosion and deposits rather than lost lubrication.
Why one petrol in a diesel task around Troy Town costs more than another
Four different tasks sit behind the four situations above — which is why there is no fair single quote. Chiefly, your cost shifts with which one you're in. The ratio counts next, meaning how much of your tank is petrol, followed by the position of your car and whether reaching it is safe for a technician.
Ahead of any quote, not after, come three questions: the fuel that got in, the quantity, and if it's run. That's why. Given those answers, you get a straight figure instead of a range.
About Troy Town itself
Troy Town is a coastal suburban area in Kent, situated near the mouth of the Medway estuary at an elevation of around 27 metres. Troy Town lies within commuting distance of London, approximately 28.5 miles to the west, and is close to the nearby cities of Southend-on-Sea and Rochester. Troy Town is predominantly composed of flat dwellings, reflecting its character as a residential area. Troy Town is also near the towns of Strood and Borstal, and is part of the larger Medway conurbation.
Troy Town and Kent: where our fuel drain cover runs
Our teams answering petrol in diesel call-outs in Troy Town, in the ME postcode area, equally work the places near it, Rochester, Strood and Borstal included. Our engineers drain wherever the vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the petrol pump around Troy Town?
The best position there is, then — that's where you are. Keep it off. Phone.