Pierremont: Petrol in a Diesel Car? How Worried to Be
Not started? Then less anxious than you likely feel. Everyone around Pierremont begins with "have I wrecked it?", and the honest answer is generally no: petrol resting inside your tank of any diesel stays harmless until priming, cranking or driving draws it into the system. Petrol in Diesel is who to call, with the motor left off, so it remains that way. Below, this page sets out what petrol really does inside a diesel, how far it might have gone, and how to stop it happening to you again.
The engine and petrol in a diesel: what goes on
Passing through a motor, diesel does two jobs at the same time. Before it combusts, it lubricates — and then it burns. Designed to very fine tolerances, the fuel injectors and the pump depend on your diesel flowing through them to stop their surfaces wearing against one another.
Petrol handles the first job poorly and the second not at all. A pump running on a petrol mixture is wearing itself out, since petrol is runnier 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's where the clattering starts.
Put those together and the shape of the issue is plain. Not contact but circulation is what does the harm. Where that petrol is only inside the tank, it's an issue of fuel, nothing more. A pump that has been working on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with your fuel to the injectors downstream.
Pierremont, petrol in a diesel: four situations, from mild to major
Fuelled up, not once started. The best case there is. The petrol is inside your tank and just that tank, and the task is a drain and a flush where the car sits. This is the one situation that can only really take place on a forecourt, as anywhere else the vehicle has been driven to get there.
Started for a second, or only the ignition on. With your system primed, the fuel lines and filter now hold petrol that came from your tank. Drain, flush, see to the fuel filter: still usually simple.
Driven a couple of miles. Now the pump has spent these miles running on diluted fuel. How hard the vehicle was driven counts as much as how far, and this work covers that tank, your lines, your filter and clean fuel through the whole circuit. Short trips, such as the school run to Reid Street Primary School, are one thing. Driving as far as Durham, under 25 miles away, makes a very different job — as does any miles on the A1(M), under 3 miles from Pierremont, with the engine working hard the whole time.
Knocking, a ragged idle, smoke, a throttle gone soft: driven until it complained. What you are hearing is the engine signalling fuel that no longer acts like diesel. Pull up wherever you are — the verge on Bloomfield Road, a lay-by, a side street — and leave the vehicle where it is. What comes first is still the drain and flush-through, and that takes care of it, with lasting damage very uncommon if a vehicle is stopped quickly.
Stories Pierremont people hear about petrol in a diesel
False: topping up to full with diesel makes it fine. It does not. Nothing is removed when you top up — your tank just holds more of the same mixture. That guidance presumes a diesel fuel system handles petrol by percentage. It does not.
"Newer diesels can handle a little petrol" — a myth, and closer to the opposite. More precise parts and higher pressure are how a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that fools motorists. Diesel in a petrol motor normally leaves a motor that won't run: the motorist stops, and so does the harm. Whilst your pump wears, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Running is not the same as fine.
Myth: "Add some two-stroke oil and drive the car home." It's an old fix for a separate problem. What petrol has thinned stays thinned, and the petrol remains in the tank anyway.
"Drain it yourself and you are sorted" — a myth, because after it has been running some petrol lies in your filter and lines, waiting to go right back through the pump on your next start. Emptying petrol into a can at the roadside is also genuinely dangerous.
How does petrol in a diesel happen?
It is seldom carelessness, and no one does it on purpose. One way only, because of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, while the diesel one generally won't fit a petrol motor. That is how the forecourt makes it easy.
When routine and the vehicle stop matching, it occurs. Hire cars, courtesy cars, and vehicles that are new to you. A household with one petrol and one diesel on the drive. A forecourt you know, but with its pumps arranged differently. Racing for a train outside North Road and fuelling up en route. Years of petrol cars behind you, a diesel Volkswagen Golf in front of you at the forecourt for its first tank — that is when. With rain, a call arriving, or children to deal with, your hand just does what it always has.
How to prevent petrol in a diesel at your next fill-up around Pierremont
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most usually do. Check the pump's label; the colour is only a hint.
- Many vehicles state the fuel inside the filler flap or on the cap, and so check it on the first fill in any vehicle you don't know.
- One of each in the household? Mark your key to your diesel — a bright fob, a sticker — since meaning 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 take the nozzle off the petrol pump. It seems silly and it does the trick.
- Put the phone away. This is an easy mistake to make while you're thinking about something else.
- Add-on devices exist for cars without one, and some diesels are built with a filler that will not take a petrol nozzle. Helpful — but a safety net at best, never a reason to stop checking the label.
- The moment you notice, stop: less petrol in your tank makes a thinner mix. What to do next doesn't change, though — still do not fire it up.
Put petrol in a diesel around Pierremont already?
Then the order of things is short. Don't fire it up, and do not turn the ignition on. If you are still at the forecourt — Shell or anywhere else — ask the attendants to help you roll the car away from the pump. Then phone 0333 366 0103 and tell us what got in, roughly how much, and whether it has run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a different problem — Pierremont has a page just for it.
Why one petrol in a diesel job around Pierremont costs more than another
An honest single quote does not exist here: four situations, four separate tasks. Mostly, the cost moves with which situation you are in. Two things come after that: the petrol that went in as a share of what your tank holds, then the place your car is in and whether our van can reach it safely.
Three questions come first, before quoting, rather than after — what went in, how much, has it run — and this is the reason. Given the answers, you get a straight figure rather than a range.
About Pierremont
Pierremont is a suburban area situated on the riverside in County Durham, with a mix of terraced housing and a population of around 9242 residents. Pierremont sits at an elevation of 55 metres, close to nearby places such as Cockerton, Hope Town, and Rise Carr. Pierremont is located approximately 16.9 miles from the city of Durham and 217.5 miles from London, in the North East region of England. Pierremont's riverside setting provides a distinctive character to the area.
Fuel drain cover across Durham, Pierremont included
Cockerton, Hope Town and Rise Carr are among the spots around Pierremont that the same teams work, answering petrol in diesel jobs across Pierremont's DL postcode area. The car doesn't 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.
In Pierremont and still at the petrol pump?
Then, you could not be in a better position. Leave it turned off, and ring.