Petrol in a Diesel Car in Over Knutsford: How Worried Should You Be?
Probably less than you already are — provided no one has started the car. Till the ignition primes the pump, the starter turns, or your car is driven, petrol in a diesel tank just waits there and does nothing. Which means the honest reply to that first Over Knutsford question — "have I wrecked it?" — normally no. Keep it that way: leave the motor off and call Petrol in Diesel. Keep reading for three things: the effect petrol has inside a diesel motor, the signs of how far it has spread, and ways to make sure you don't do it again.
The engine and petrol in a diesel: what goes on
Passing through a motor, diesel does two things at the same time. Oiling comes before burning; it does both. What stops the surfaces inside the high-pressure pump and your injectors from wearing against one another is the diesel passing through them — they are built to extremely fine gaps.
Badly at the first, not at all at the second: that's petrol. The rattling comes from petrol being made not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips away the lubrication your system depends on, and any pump working on such a mix is wearing itself.
Combined, those leave the shape of the problem clear. The damage is done by movement, not by contact. Any tank with petrol in it is a fuel problem. Whatever a worn pump sheds goes on, carried by the fuel, into the fuel injectors downstream, which is why a pump that has been working on the petrol is where a mechanical problem starts.
How bad is petrol in a diesel? Four scenarios our engineers see around Over Knutsford
Fuelled, and never started: nothing beats it. Being on a forecourt is what makes this the case: elsewhere, the car has been driven there to begin with. With the petrol held in your tank alone, it is drained and cleaned on the spot, and nothing more is needed.
Ignition on, or started for a second. The fuel system has been primed, so petrol has left the tank and got to the filter and the lines. That is generally still an easy task — a drain, a flush, and the filter seen to.
Some miles driven, and your pump has spent every one of them running on weakened fuel. How hard the vehicle was driven matters as much as how far, and the work covers that tank, the fuel lines, the filter and clean fuel through the whole circuit. Short trips, such as the school run to St Vincent De Paul Catholic Primary School, are one thing. Very different once more: a trip to Salford, under 15 miles away, or some mileage on the M6, under 3 miles from Over Knutsford, where the motor kept running hard.
It complained, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone lumpy. What you are hearing is the engine reporting fuel that no longer behaves like diesel. Whether it's the verge on Fir Tree Avenue, a lay-by or a side road, stop there and leave it. Long-term damage is very unusual when a vehicle is pulled over soon, and the drain and flush-through that still go first deal with it.
Petrol in a diesel myths Over Knutsford drivers hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Nothing is removed when you top up — that tank simply holds more of the same mixture. The idea behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong.
Not so: a current diesel copes with a bit of petrol. If anything, the opposite. A current diesel runs its fuel through smaller parts at higher pressure, which makes the lubrication matter more, not less.
Myth: "If it starts and drives, there is no damage done." This is the one that catches motorists. Feed diesel to a petrol engine and it generally won't run, so the driver stops — and the harm stops with them. While your pump wears, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Running is not the same as fine.
An old workaround for a separate problem is behind this one. Myth: "Add some two-stroke oil and drive it home." The petrol is still in the tank after that, and whatever it has thinned isn't put back.
The next start sends petrol back round your pump out of the lines and your filter, where some of that ends up after the motor has been run. That is why a DIY tank drain doesn't sort it — a myth. It is also really risky to drain petrol into a can by the kerbside.
Why petrol in a diesel happens at all
On purpose? Never. Through carelessness? Rarely, if ever. One way only, since of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one generally will not fit a petrol car. That's how the forecourt makes it easy.
Habit and the vehicle falling out of step is when it takes place. A new vehicle, a hire car or a courtesy car. Households running one of each, petrol and diesel. A well-known forecourt with the pumps in a different order. Fuelling up in a hurry en route to Knutsford, with a train to catch. Exactly the moment it happens: after years of driving petrol, a driver fills a diesel Renault Megane for the first time. With rain, a call arriving, or children to deal with, your hand simply does what it has always done.
Over Knutsford drivers: how to prevent petrol in a diesel next time
- The label is what matters, and so read the petrol pump rather than the colour: in the UK unleaded handles are normally green and diesel black, yet not on each forecourt.
- The first fill in a strange vehicle is the time to check your filler flap — inside it, or on the cap, many vehicles state which fuel they take.
- A coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember, for a household with one of each.
- It sounds silly and it works: on the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away then keep your mind on the petrol pump.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to reject a petrol nozzle, and add-on devices exist for motors without one. They are a safety net, not a reason to stop checking the pump.
- Stop as soon as you notice. Less petrol in that tank means a thinner blend. It doesn't change what to do next, which is still not to start the car.
Already put petrol in a diesel around Over Knutsford?
Then the order of things is short. Don't crank it, and don't turn your ignition on. Still on the forecourt, at Esso or anywhere else? Ask the attendants to help you push the car clear of the petrol pump. Then ring 0333 366 0103 and tell us what went in, roughly how much, and whether it's run.
If it was AdBlue rather than petrol, say so. That is a different problem — corrosion and deposits and not lost protection — and it has its own page for Over Knutsford.
What makes one Over Knutsford petrol in a diesel task cost more than the next
There is no fair single quote for this, because the four situations above are four separate jobs. The scenario itself does most of the work of moving your cost. Two things come after that: the petrol that got in as a proportion of what your tank holds, then the spot your car is in and whether our van can get to it safely.
What got in, how much, and whether it has run — three questions we ask before quoting, not after, for exactly that reason. Given the replies, you get a straight figure rather than a range.
About Over Knutsford
Over Knutsford is a suburban area situated on the riverside in Cheshire, with a mix of housing types although predominantly detached homes. Over Knutsford sits at an elevation of 69 metres, close to the town of Knutsford and near other local places such as Cross Town and Shaw Heath. Over Knutsford is located near Salford, which is approximately 13 miles away, and is about 155 miles from London.
Fuel drain cover across Cheshire, Over Knutsford included
Petrol in diesel calls around Over Knutsford — part of the WA postcode area — go to teams that likewise cover the spots about it, Cross Town, Knutsford and Shaw Heath included. We drain where the car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Over Knutsford: still at the petrol pump?
Then you are in the best spot there is. Turned off it stays; then call.