Town End Farm: Petrol in a Diesel Car? How Worried to Be
Unstarted? Then less worried than you likely are. Everyone in Town End Farm starts with "have I ruined it?", and the fair answer is generally no: petrol resting in that tank of any diesel stays harmless until priming, cranking or driving pulls it into the system. Petrol in Diesel is who to phone, with the engine kept off, so it remains that way. The rest of this page sets out what petrol really does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you again.
Petrol in a diesel: what does it do to the engine?
Two tasks fall to diesel on its journey through a motor. It lubricates to begin with, and after that does it burn. Very fine clearances are built into the injectors and the high-pressure pump, and just your diesel flowing through keeps their surfaces from grinding together.
The second task petrol doesn't do at all, and the first it does badly. A pump running on a petrol blend is wearing itself out, because 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 reverse of what a diesel needs from its fuel — and that's where the clattering starts.
The shape of the problem is plain once you put those together. Contact doesn't do the harm — circulation does. A tank with petrol in it is a fuel issue. The beginning of a mechanical problem is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with the fuel to the injectors downstream.
Petrol in a diesel in Town End Farm: how bad is it? Four situations
Filled up, never started. The best case there can be. The petrol is in that tank and just that tank, and the job is a drain and a flush where your car sits. This is the one scenario that can only truly take place at a forecourt, because anywhere else your car has been driven to get there.
The ignition turned on, or a brief start. Once primed, the fuel system has pulled petrol out of your tank up to the filter and the lines. Drain, flush, see to your filter: still normally simple.
Those few miles on the road meant the pump running on fuel thinned by petrol throughout. How hard the car was driven counts as much as how far, and the work takes in that tank, the lines, the fuel filter and clean fuel through the entire system. The school run to Bexhill Academy is one matter. Any distance on the A194(M), under 3 miles from Town End Farm, means the motor has worked hard throughout, and a run to Sunderland, under 5 miles away, is a very different task too.
Driven on until it complained — clattering, smoke, a ragged idle, a soft throttle. The engine is telling you your fuel is no longer behaving like diesel. Pull up where you are — on the verge on Bingley Street, at the kerb, down a side road — and don't move it again. Permanent damage is very rare if a vehicle is stopped quickly, and the fuel drain and flush-through that still go first deal with it.
What Town End Farm drivers get told about petrol in a diesel — and the myths in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Topping up takes out nothing; it gives you a fuller tank of the same mixture. A diesel fuel system doesn't accept petrol by percentage in the way that advice supposes.
"Modern diesels can handle a little petrol" — a myth, and nearer the opposite. Protection counts more on current diesels, not less, because their fuel runs through more precise components at higher pressure.
"It starts, it drives, and so there is no harm" — the myth that trips up more drivers than any other. The driver of a petrol motor fed diesel normally has no choice but to stop, since it will not run, and the damage stops there. A diesel fed petrol usually starts, ticks over and drives away as though nothing has happened, whilst your pump grinds. Running doesn't mean fine.
Myth: "Add some two-stroke oil and drive the car home." It is an outdated workaround for a separate issue. What petrol has thinned remains thinned, and the petrol remains in your tank anyway.
Myth: "Drain your tank yourself and you are sorted." Once the engine has run, some of the petrol is no longer inside your tank: it's in the fuel filter and the lines, and it goes straight back through the pump on the next start. Clearing petrol into a can at the kerbside is also really dangerous.
How it happens: petrol in a diesel
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle generally will not fit a petrol vehicle, yet the smaller petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error straightforward, and only in one direction.
The moment routine stops matching the vehicle is the moment it takes place. Hire cars, courtesy cars, and motors 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 East Boldon and filling up en route. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it happens. Throw in rain, a phone call or a back seat full of children, and your hand repeats what it has always done.
Next time you fill up in Town End Farm: preventing petrol in a diesel
- Read the petrol pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on every forecourt. The label is what counts.
- Check your filler flap. Plenty of motors state the fuel inside the flap or on the cap. Look at it on your first fill in a car you don't know.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of meaning to remember, for a house with one of each.
- 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 pump. It sounds silly and it works.
- Put your 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 come with a filler designed to block a petrol nozzle, and aftermarket devices exist for the rest. Count it as a backstop, and keep reading the petrol pump.
- Less petrol makes a weaker mixture, so stop as soon as you notice — while remembering that your next step is unchanged. It's still not to crank it.
Already put petrol in a diesel around Town End Farm?
The order of things is brief, then. Do not turn the ignition on, and do not fire it up. The staff at the forecourt — whether at BP itself or wherever you filled up — will usually help roll it away from the petrol pump if you ask. Then call 0333 366 0103 and tell us what got in, roughly how much, and if it has run.
Corrosion and deposits are the problem with AdBlue, whereas petrol brings lost lubrication. So if it was AdBlue, say so — and read its own Town End Farm page.
What makes one Town End Farm petrol in a diesel task cost more than the next
Four separate tasks lie behind the four situations above — which is why there's no fair single quote. The situation itself does most of the work of moving your cost. Two things come after that: the petrol that went in as a proportion of what that tank takes, then the spot your car is in and whether a van can reach it safely.
That is why our technicians ask three questions before pricing instead of after: what went in, how much, and if it has run. Their answers are what turn a range into one firm number.
About Town End Farm
Town End Farm is a suburban area located on the outskirts of Sunderland in Tyne and Wear, situated near the river at an elevation of 36 metres. Town End Farm sits close to several nearby places of interest, including Hylton Castle and Downhill, and is characterized by its predominantly semi-detached housing stock. Town End Farm is part of the wider Sunderland urban area, with the city centre just 3.4 miles away.
Across Tyne and Wear and in Town End Farm: fuel drain cover
Petrol in diesel calls in Town End Farm — part of the SR postcode area — go to vans that likewise cover the spots around it, Hylton Castle, Downhill and Castletown included. You need not bring the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations we drain.
At the petrol pump in Town End Farm, right now?
No position is better: that is where you are. Leave the car turned off, then ring.