Hadleigh: Petrol in a Diesel Car? How Worried to Be
Likely less than you are now — provided no one has started the car. Till your ignition primes your pump, your starter turns, or your car is driven, petrol in a diesel tank simply waits there and does no harm. Which means the honest reply to the first Hadleigh query — "have I wrecked it?" — usually no. Leave the engine off then ring Petrol in Diesel — that keeps it 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 doesn't happen to you a second time.
The motor and petrol in a diesel: what goes on
Diesel does two jobs on its way through a motor. It combusts, and before it ignites it lubricates. Designed to extremely fine clearances, your injectors and your pump rely on your diesel moving through them to keep their surfaces from wearing against one another.
Of these two tasks, petrol manages the first poorly and the second not at all. Being less viscous than diesel, petrol strips away the protection a fuel system needs, leaving a pump on the mixture to wear itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is why you get the knocking.
Combined, those leave the shape of the trouble plain. Not contact but movement is what causes the damage. All a tank with petrol in it amounts to is a fuel issue. Once your pump has been working on that petrol, a mechanical problem has started: anything shed by a pump that's wearing down is carried onward to the fuel injectors with your fuel.
Petrol in a diesel around Hadleigh: how serious is it? Four situations
The best case there is: filled up, not once started. The petrol is inside the tank and only the tank, and the job is a drain and a flush where the car stands. This is the one scenario that can only truly happen on a forecourt, since anywhere else your car has been driven to get there.
Ignition on, or started for a second. Your system has been bled, and so petrol has left the tank and reached the filter and your lines. That is generally still a straightforward task — a drain, a flush, and the filter seen to.
Driven a few miles. Now your pump has spent these miles working on diluted fuel. Tank, lines, filter, then fresh fuel put through the entire system: that is this work, and the way your car was driven matters as much as the mileage. On the school run to Hadleigh Community Primary School, the mileage is small. Getting as far as Colchester, under 15 miles away, makes a very different job — as does any miles on the M11, under 50 miles from Hadleigh, with your engine labouring hard all the way.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone lumpy. The fuel isn't acting like diesel any more, and the engine is saying so. Whether it is the verge on Market Place, a lay-by or a side road, stop there and leave it. Permanent damage is very unusual when a car is pulled over soon, and the drain and flush-through that still go first take care of it.
Petrol in a diesel myths Hadleigh drivers hear
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. The idea behind the advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
If anything, the opposite is true. Myth: "A newer diesel can cope with a bit of petrol." Lubrication counts more on current diesels, not less, because their fuel runs through smaller components at higher pressure.
"It starts, it drives, and so no harm done" — the myth that catches more drivers than any other. Feed diesel to a petrol motor and it normally won't run, so the motorist stops — and the harm stops with them. A diesel fed petrol generally starts, ticks over and drives away as if nothing has happened, whilst the pump wears. Running is not the same as fine.
An outdated workaround for a separate problem lies behind this one. Myth: "Add some two-stroke oil and drive the car home." What petrol has thinned remains thinned, and that petrol remains inside your tank anyway.
If your engine has been run, part of the petrol sits in your filter and the fuel lines, not your tank — and your next start pulls it straight back through your pump. So the myth "drain the tank yourself and you are sorted" does not stand up. On top of that, petrol cleared into a can by the road is truly risky.
Petrol in a diesel: how does it occur?
Carelessness is seldom the cause, and no one means to do it. One way only, because of the nozzles: the narrower petrol one slides inside a diesel filler with almost no resistance, while the diesel one generally won't fit a petrol vehicle. That's how the forecourt makes it simple.
The moment routine stops matching the vehicle is the moment it occurs. Courtesy car, hire car, or a car that is new. One petrol and one diesel on the drive of the same household. The pumps in a different order on a well-known forecourt. Rushing for a train outside Manningtree and fuelling up en route. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver used to petrol: precisely when it takes place. The hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
Hadleigh people: how to avoid petrol in a diesel next time
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most generally do. Read the petrol pump's label; the colour is only a hint.
- Many vehicles state the fuel type inside the filler flap or on the cap, and so check there on your first fill in a motor you don't know.
- Mark the 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 meaning to remember.
- "Diesel", aloud, before you pick up the nozzle — every time a new or hired car gets its first tank. It seems silly. It does the trick.
- Mistakes like this are straightforward to make while your mind is on something else, so the phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to block a petrol nozzle, and aftermarket devices are available for the remainder. Count it as a backstop, then keep checking the pump.
- Spotting it halfway? Stop at once. A thinner mix results from less petrol inside that tank, yet the next stage remains the same: do not fire it up.
Put petrol in a diesel in Hadleigh already?
Short and simple, then, is the order of things. Do not fire it up, and do not turn the ignition on. Ask the attendants to help you push it clear of the pump if you're still at the forecourt, whether that's Gulf or anywhere else. Next, 0333 366 0103. We'll ask what was put in, about how much, and if it's been run.
Say so if it was AdBlue rather than petrol: it's a different issue, with its own page for Hadleigh, because AdBlue brings corrosion and deposits rather than lost protection.
One petrol in a diesel task around Hadleigh costs more than another. Why?
Four separate jobs lie behind the four situations above — which is why there is no fair single quote. Which of them you're in is mostly what moves your cost. Two things come after that: the petrol that was put in as a proportion of what your tank takes, then the spot the car is in and whether a van can reach it safely.
What was put in, how much, and whether it has run — three queries our technicians ask before quoting, not after, for exactly that reason. Those replies turn a range into a straight figure.
About Hadleigh, briefly
Hadleigh is a town situated on the banks of the River Brett in Suffolk, with a population of around 8340 people. Hadleigh sits at an elevation of 23 metres, close to the nearby villages of Upper Layham and Lower Layham. Hadleigh is characterized by its predominantly detached housing stock and is located near Oaks Tye, within commuting distance of Colchester and around 59 miles from London. Hadleigh has a riverside setting that influences its local environment and community.
Fuel drain cover across Suffolk, Hadleigh included
The vans answering petrol in diesel calls in Hadleigh, in the IP postcode area, equally work the places near it, Upper Layham, Lower Layham and Oaks Tye included. A forecourt, a supermarket car park, a lay-by or your own drive are all spots our engineers drain, and the vehicle doesn't need to move to us.
In Hadleigh and still at the petrol pump?
The best position there is, then — that is where you are. Switched off it remains; then phone.