Richmond Hill: Petrol in a Diesel Car? How Worried to Be
Likely less than you are now — provided no one has started the car. Petrol resting in a diesel tank does nothing to the engine till something draws it through your fuel system — the ignition priming the pump, your starter, or the drive on its own. So the fair answer to the first question anyone around Richmond Hill asks, "have I ruined it?", is usually no. To keep it that way, call Petrol in Diesel then leave your motor switched off. Below, you will find what petrol actually does inside a diesel, how far it may have got, and how to stop it happening to you again.
The motor and petrol in a diesel: what goes on
Passing through a motor, diesel does two things at the same time. It combusts, and before it burns it lubricates. The high-pressure fuel pump and your injectors are made to extremely fine clearances, and your diesel passing through them is what stops those surfaces from wearing down against one another.
The second task petrol does not do at all, and the first it does poorly. A pump running on a petrol mixture is wearing itself out, since petrol is thinner than diesel and strips out the lubrication your fuel system relies 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 rattling comes.
The shape of the issue is plain when you put those together. Contact doesn't do the harm — movement does. All a tank with petrol in it amounts to is a fuel problem. Whatever a worn pump sheds goes on, carried by your fuel, into the injectors downstream, which is why a pump that has been working on the petrol is where a mechanical fault starts.
Four scenarios our technicians see around Richmond Hill: how bad is petrol in a diesel?
Fuelled up, not once started. The best case there can be. Being on a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With that petrol held in your tank alone, it is emptied and flushed on the spot, and nothing more is needed.
Started for a moment, or just the ignition on. Once primed, the system has pulled petrol from that tank as far as your filter and your lines. Drain, flush, see to your filter: still normally straightforward.
The pump now worked a couple of miles on diluted fuel — that's what driving the car meant. Tank, lines, filter, then fresh fuel run through the entire system: that is this work, and the way your car was driven matters as much as the miles. The school run to Lakenham Primary School is one matter. Getting as far as Norwich, under a mile away, makes a very different task — as does any mileage on the M11, over 50 miles from Richmond Hill, with your engine labouring hard all the way.
Driven on until it protested — knocking, smoke, a lumpy idle, a dead throttle. That's your engine telling you its fuel has stopped behaving like diesel. Pull up where you are — on the verge on Ber Street, at the kerb, down a side road — and don't move it. What goes first is still the fuel drain and flush-through, and that takes care of it, with permanent damage very uncommon when a vehicle is stopped soon.
What Richmond Hill motorists get told about petrol in a diesel — and the myths in it
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. Nothing comes out when you top up — your tank just holds more of the same mixture. Percentage isn't how a diesel fuel system copes with petrol, whatever that advice supposes.
If anything, the opposite is true. Myth: "A current diesel can cope with a bit of petrol." Protection counts more on current diesels, not less, since their fuel runs through smaller parts at higher pressure.
Myth: "If it starts and drives, there is no damage done." This is the one that catches drivers. Any petrol engine fed diesel generally will not run, so the driver stops and the damage stops with them. While your pump wears, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It's an old fix for a distinct fault. None of what petrol thinned is put back by it — and afterwards, the tank still contains that petrol.
If the engine has been run, part of the petrol is in the fuel filter and the lines, not that tank — and the next start sends it right back through your pump. So the myth "drain your tank yourself and you're sorted" doesn't hold. It's also really hazardous to drain petrol into a can by the kerbside.
Why petrol in a diesel takes place at all
On purpose? Never. Through carelessness? Rarely, if ever. The forecourt makes it simple: the petrol nozzle is the smaller of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle generally will not go into a petrol vehicle at all. So the error runs one way.
Habit and the car getting out of step is how it happens. Courtesy car, hire car, or a car that's brand new. A household with one petrol and one diesel on the driveway. Your normal forecourt, its pumps suddenly in a different order. A hurried fill en route to Norwich with a train to catch. The first fill-up in a diesel Renault Megane after years of driving petrol is precisely the moment it happens. Add a back seat full of kids, a phone call or rain, and habit wins.
Next time you fill up around Richmond Hill: preventing petrol in a diesel
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most generally do. Check the pump's label; the colour is just a hint.
- Inspect your filler flap. Many vehicles state the fuel type inside the flap or on the cap. Look at it on your first fill in any car you do not know.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of intending to remember, for a household with one of each.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It seems daft and it works.
- Mistakes like this are easy to make while your mind is on something else, and so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to reject a petrol nozzle, and aftermarket devices exist for the rest. Treat it as a safety net, then keep reading the petrol pump.
- Stop the moment you notice. Less petrol inside the tank makes a thinner mix. It doesn't change what to do next, which is still not to fire it up.
Put petrol in a diesel in Richmond Hill already?
Then, there's just a short order of things. Starting it is out, and so is turning on your ignition. The attendants on the forecourt — whether at Sainsbury's itself or wherever you filled up — will normally help push it away from the pump if you ask. Phone 0333 366 0103 next, with three facts — your fuel, the approximate amount, and whether it has run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a different fault — Richmond Hill has a page just for it.
What makes one Richmond Hill petrol in a diesel task cost more than the next
The four scenarios above are four different tasks, so no single price for this would be honest. Which of them you're in is chiefly what shifts your cost. Two things come after that: the petrol that got in as a proportion of what your tank holds, then the place your car is in and whether our van can get to it safely.
That's why we ask three questions before costing rather than after: what got in, how much, and whether it's run. With those answers, there is a straight figure instead of a range.
About Richmond Hill itself
Richmond Hill is a suburban area located on the riverside in Norfolk, with a relatively low elevation of 37 metres. Richmond Hill sits adjacent to the city of Norwich, with which it is closely tied, and is near other nearby places such as Lakenham and Trowse Millgate. Richmond Hill is characterized by a high proportion of flat-type housing, which is typical of many urban and suburban areas in the region. Richmond Hill is also situated about 98 miles from London, making it a relatively distant but still accessible suburb.
Richmond Hill and Norfolk: where our fuel drain cover reaches
The teams answering petrol in diesel jobs in Richmond Hill, in the NR postcode area, also work the places near it, Lakenham, Trowse Millgate and Norwich among them. A forecourt, a supermarket car park, a lay-by or your own drive are all locations we work, and your car does not need to move to us.
Richmond Hill: still at the petrol pump?
Nothing beats it: that is where you now are. Keep it off. Call.