Petrol in a Diesel Car in Wilton Dean: How Worried Should You Be?
Probably less than you already are — provided no one has started it. Until your ignition primes the pump, the starter cranks, or your car is driven, petrol in a diesel tank just waits there and does nothing. Which makes the honest reply to the first Wilton Dean question — "have I ruined it?" — normally no. Petrol in Diesel is who to phone, with your engine kept off, and so it stays that way. The remainder of this page explains what petrol really does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you again.
The engine and petrol in a diesel: what happens
Diesel does two tasks on its way through a motor. It lubricates to begin with, and after that does it burn. Built to very fine gaps, the fuel injectors and the pump depend on your diesel moving through them to stop their surfaces wearing against one another.
Petrol does the first task badly and the second not at all. A pump working on a petrol mix is wearing itself out, since petrol is thinner than diesel and strips out the lubrication the fuel system depends on. Petrol is also made to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that is where the knocking starts.
Together, those make the shape of the issue clear. The damage is done by movement, not by contact. Where that petrol is only inside your tank, it's a fault of fuel, nothing more. After the pump has been running on that petrol, a mechanical problem has begun: anything shed by a pump that is wearing down travels onward to the injectors with your fuel.
Wilton Dean, petrol in a diesel: four cases, from mild to serious
Filled up, never started. The best case there is. Only that tank has petrol in it, so the job is draining your tank and rinsing the fuel system where the vehicle stands. This scenario can only really happen at a forecourt: anywhere else, the car got there by being driven.
A moment's running, or merely the ignition on. Once primed, the system has drawn petrol from your tank up to the fuel filter and your lines. Normally little more than clearing, rinsing and sorting the fuel filter, so still easy.
Driven a couple of miles. Now your pump has spent these miles labouring on diluted fuel. How hard the vehicle was driven matters as much as how far, and the work covers the tank, the lines, the fuel filter and clean fuel through the whole circuit. Short trips, like the school run to the local primary school, are one thing. Very different once more: a trip to Carlisle, under 50 miles away, or any miles on the A74(M), under 50 miles from Wilton Dean, where your engine never stopped labouring hard.
Driven till it protested. Knocking, a lumpy idle, smoke, a throttle that has gone soft. The fuel isn't acting like diesel any more, and the motor is saying so. Pull up wherever you are — the verge on Overhall Road, a lay-by, a side street — and leave it where it is. What comes first is still the drain and flush, and that deals with it, with lasting damage very unusual when a vehicle is pulled over soon.
Petrol in a diesel stories Wilton Dean motorists hear
"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 are left with a fuller tank, still the same mix. A diesel fuel system does not accept petrol by percentage in the way that advice assumes.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." Lubrication counts more on current diesels, not less, since their fuel runs through more precise parts at higher pressure.
One myth that catches people off guard: if it starts and drives, it must be unharmed. The driver of a petrol motor fed diesel normally stops, since it will not run, and the damage stops there. Feed petrol to a diesel and it normally fires up, ticks over and pulls away like nothing has happened — all while its pump wears. A running engine doesn't mean fine.
Not so: a two-stroke additive makes it safe to drive home. It is an old fix, supposed for another fault. What petrol has thinned stays diluted, and that petrol stays in that tank anyway.
The next start sends petrol back round your pump out of your lines and the filter, where some of that sits once the engine has run. That is why draining your tank yourself doesn't sort it — a myth. Also, a can of petrol filled at the roadside is genuinely risky.
How it happens: petrol in a diesel
No one does it on purpose, and it's seldom carelessness. One way only, since of the nozzles: the slimmer petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol vehicle. That's how the forecourt makes it easy.
When routine and your car stop matching, it happens. A new motor, a hire car or a courtesy car. A household with one petrol and one diesel on the driveway. A familiar forecourt with the pumps in a different order. Racing for a train outside the nearest station and filling up en route. Precisely the moment it occurs: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Add a back seat full of kids, a phone call or rain, and the hand wins.
Wilton Dean people: how to avoid petrol in a diesel next time
- The label is what matters, so check the pump instead of the colour: in the UK unleaded handles are usually green and diesel black, but not on each forecourt.
- Check your filler flap. Many vehicles state the fuel type inside the flap or on the cap. Look at it on the first fill in any motor you do not know.
- Mark your key. In a house with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- "Diesel", out loud, before you pick up the nozzle — each time a new or hired car needs its first tank. It seems silly. It works.
- Whilst you are thinking about something else, this is an easy mistake to make — so put the phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to refuse a petrol nozzle, and add-on devices are available for the remainder. Treat it as a safety net, and keep reading the petrol pump.
- The moment you notice, stop: less petrol inside your tank makes a thinner mix. What to do next does not change, though — still do not fire it up.
Already put petrol in a diesel in Wilton Dean?
Then, there is only a short order of things. Do not switch your ignition on, and don't start it. If you are still at the forecourt — Sainsbury's or anywhere else — ask the attendants to help you push the car clear of the petrol pump. Then call 0333 366 0103 and tell us what was put in, about how much, and whether it has run.
Say so if it was AdBlue rather than petrol: it's a separate fault, with its own page for Wilton Dean, since AdBlue brings corrosion and deposits instead of lost protection.
Why one petrol in a diesel task in Wilton Dean costs more than another
The four scenarios above are four separate tasks, so no single price for this would be fair. What moves the cost is mostly which of them you are in. After that it is the share — how much petrol went in against how much your tank takes — and then where the car is and whether our van can reach it safely.
That's why we ask three questions before quoting rather than after: what got in, how much, and if it has run. With the answers, there is a straight figure rather than a range.
About Wilton Dean and where it is
Wilton Dean is a suburban area situated on the riverside in the Scottish Borders, with a mix of detached housing and a population of around 517 residents. Wilton Dean sits at an elevation of 134 metres, near the communities of Cauld, West End, and Lynnwood. Wilton Dean is located approximately 37 miles from Carlisle and 292 miles from London, making it a relatively rural suburb. Wilton Dean has a scenic setting, with the river running nearby.
Fuel drain cover across Scottish Borders, Wilton Dean included
Our vans answering petrol in diesel jobs in Wilton Dean, in the TD postcode area, also work the locations around it, Cauld, West End and Lynnwood among them. The car does not need to come to us: our technicians drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
Wilton Dean: still at the pump?
Then you are in the best position there can be. Keep it off. Call.