How Worried Should You Be? Petrol in a Diesel Car in Long Melford
Probably less than you are now — provided no one has started the car. Everyone around Long Melford starts with "have I wrecked it?", and the honest answer is normally no: petrol resting in the tank of any diesel remains harmless until priming, cranking or driving pulls it into the system. 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 travelled, and how to keep it from happening again: that is the remainder of this page.
Inside the motor: what petrol in a diesel really does
On its way through a motor, diesel has two jobs. It lubricates first, and after that does it burn. Very fine tolerances are built into the fuel injectors and the high-pressure pump, and just the diesel running through stops their surfaces grinding together.
Petrol handles the first job poorly and the second not at all. The knocking comes from petrol being designed not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the lubrication your system hinges on, and any pump working on that mix is wearing itself.
Seen together, they show the shape the issue has. The damage is done by movement, not by contact. All a tank with petrol in it amounts to is a fuel problem. Whatever a worn pump sheds goes on, borne by your fuel, into the fuel injectors further along, which is why a pump that has worked on that petrol is where a mechanical issue begins.
Four scenarios our engineers see in Long Melford: how bad is petrol in a diesel?
Fuelled but not once started — as good as it gets. At a forecourt, and really only there, that petrol is still confined to the tank — because anywhere else the vehicle was driven to get to it. The task is emptying and rinsing on the spot.
Your ignition switched on, or a brief start. With your system primed, your lines and filter already contain petrol that has come from your tank. Drain, flush, deal with the filter: still normally simple.
Driven a few miles. Now the pump has spent these miles running on thinned fuel. The work is the tank, your lines, your filter and clean fuel through the whole circuit, and how hard the car was driven matters as much as how far. Short trips, like the school run to Long Melford Church of England Primary School, are one thing. Very different a second time: a run to Colchester, under 15 miles away, or some miles on the M11, under 25 miles from Long Melford, where the motor never stopped working hard.
Clattering, an uneven idle, smoke, a throttle gone soft: driven until it complained. What you are hearing is the engine reporting fuel that no longer behaves like diesel. Whether it is the verge on Little St Mary's, a lay-by or a side road, stop there then leave it. What goes first is still the fuel drain and flush, and that sorts it out, with lasting damage very unusual if a vehicle is pulled over quickly.
Petrol in a diesel myths Long Melford motorists hear
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It won't. Nothing is removed when you top up — that tank simply holds more of the same blend. A diesel fuel system doesn't accept petrol by percentage in the way that advice presumes.
Myth: a modern diesel copes with a bit of petrol. If anything, the opposite. Protection counts more on newer diesels, not less, because their fuel runs through smaller components at higher pressure.
"It starts, it drives, so there is no harm" — the myth that catches more motorists than any other. The motorist of a petrol motor fed diesel normally stops, since 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 does; meanwhile your pump wears. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive the car home." It is an outdated fix for a different issue. What petrol has thinned remains diluted, and that petrol remains inside your tank regardless.
Myth: "Drain your tank yourself and you are sorted." Once the motor has run, some of the petrol is no longer inside that tank: it is in the fuel filter and your lines, and it goes straight back through the pump on the next start. On top of that, petrol emptied into a can by the road is genuinely hazardous.
Why petrol in a diesel occurs so easily
On purpose? Never. Through carelessness? Rarely, if ever. One way only, since of the nozzles: the smaller petrol one slips inside a diesel filler with almost no resistance, while the diesel one mostly won't fit a petrol motor. That's how the forecourt makes it simple.
The moment habit stops matching your car is the moment it takes place. Courtesy car, hire car, or a motor that is new. One petrol and one diesel on the drive of the same household. A well-known forecourt with the pumps in a different order. A rushed fill on the way to Sudbury Suffolk with a train to catch. Years of petrol vehicles behind you, a diesel Renault Megane in front of you at the forecourt for its first tank — that is when. With rain, a call arriving, or a car full of children to deal with, the hand simply does what it always has.
Avoiding petrol in a diesel next time you fill up around Long Melford
- Read the pump, not the colour. In the UK unleaded handles are generally green and diesel black, but not on each forecourt. The label is what counts.
- Many vehicles state the fuel inside your filler flap or on the cap, so check there on the first fill in any vehicle you do not know.
- Mark the key. In a household with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- It seems daft and it works: on your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump.
- Whilst you're thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Add-on devices exist for motors without one, and some diesels come with a filler that will not take a petrol nozzle. Useful — but a safety net at best, never a reason to stop checking the label.
- Less petrol makes a thinner mixture, so stop the moment you realise — while remembering that the next step is unchanged. It is still not to start the car.
Petrol already in a diesel in Long Melford? Start here
The order of things is short, then. Leave it unstarted, with your ignition off as well. The attendants at the forecourt — whether at Tesco itself or wherever you filled up — will normally help push it away from the pump if you ask. Next, 0333 366 0103. We will ask what got in, about how much, and if it's been run.
Say so if it was AdBlue rather than petrol: it's a separate problem, with its own page for Long Melford, because AdBlue brings corrosion and deposits instead of lost protection.
One petrol in a diesel task around Long Melford costs more than another. Why?
There is no honest single quote for this, since the four scenarios above are four separate jobs. What shifts the cost is chiefly which of them you are in. Where your car is matters too, and whether a van can safely reach it, after the ratio of petrol to what that tank takes.
That is why we ask three questions before costing rather than after: what went in, how much, and whether it's run. The replies turn a range into a straight figure.
About Long Melford
Long Melford is a village situated in the Stour Valley in Suffolk, with the River Stour running along its edge. Long Melford lies at an elevation of 34 metres, close to the Essex border, and is surrounded by nearby places such as Liston and Rodbridge Corner. Long Melford has a mix of housing types, but semi-detached homes are predominant, and the village is within commuting distance of Colchester and London. Long Melford is home to approximately 1683 residents, according to recent estimates.
Fuel drain cover across Suffolk, Long Melford included
Liston, Rodbridge Corner and Liston Gardens are among the locations near Long Melford that the same teams work, answering petrol in diesel call-outs across Long Melford's CO postcode area. You need not bring the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places where we work.
At the petrol pump around Long Melford, right now?
Nothing beats it: that's where you now are. Phone, and leave it turned off.