Petrol in a Diesel Car in Steventon: How Worried Should You Be?
Probably less than you are now — as long as no one has started the car. Till the ignition primes your pump, your starter turns, or the car is driven, petrol in a diesel tank just rests there and does no harm. Which means the honest reply to the first Steventon question — "have I wrecked it?" — normally no. Petrol in Diesel is who to phone, with your engine left off, and so it remains that way. Read on for three things: the effect petrol has inside a diesel motor, the clues of how far it has spread, and the way to make sure you never repeat it.
Inside the motor: what petrol in a diesel really does
Passing through a motor, diesel does two things at once. Oiling comes before burning; it does both. What keeps the surfaces inside your high-pressure pump and the injectors from wearing down against one another is the diesel passing through them — they're made to extremely fine clearances.
Badly at the first, not at all at the second: that's petrol. A pump running on a petrol mixture is wearing itself out, since petrol is thinner than diesel and takes away the lubrication the fuel system relies on. Petrol is also made to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that's where the clattering starts.
Taken together, they show what shape the trouble takes. It's circulation that causes the damage, not contact. Any tank with petrol in it is a fuel problem. Whatever a worn pump sheds travels on, carried by the fuel, into your injectors downstream, which is why a pump that has worked on that petrol is where a mechanical problem begins.
Four scenarios our engineers see around Steventon: how serious is petrol in a diesel?
Fuelled up, not once started. The best case there can be. That petrol is inside your tank and only that tank, and the task is a drain and a flush where the car stands. This is the one scenario that can only really occur at a forecourt, since anywhere else the car has been driven to get there.
A brief spell of running, or merely the ignition on. The system has been bled, so petrol has left your tank and got to your filter and your lines. That is normally still an easy task — a drain, a flush, and the fuel filter dealt with.
A couple of miles driven, and the pump has spent every one of them running on weakened fuel. The work is the tank, the fuel lines, your filter and fresh fuel through the entire system, and how hard the car was driven matters as much as how far. Short trips, such as the school run to St Michael's CofE Primary School, Steventon Village, are one matter. Getting as far as Oxford, under 10 miles away, makes a very different task — as does any miles on the M4, under 15 miles from Steventon, with the motor labouring hard all the way.
It protested, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. The engine is telling you your fuel is no longer behaving like diesel. Pull up where you are — on the verge on Brewer Close, at the kerb, down a side road — and don't move it. A vehicle stopped soon very rarely has long-term damage, since the fuel drain and the flush, which still come first, take care of it.
Stories Steventon motorists hear about petrol in a diesel
False: topping up to full with diesel makes it fine. It does not. Nothing comes out when you top up — your tank just holds more of the same mixture. Percentage is not how a diesel fuel system copes with petrol, whatever that guidance assumes.
If anything, the opposite is true. Myth: "A current diesel can cope with a bit of petrol." More precise parts and higher pressure are the way a current diesel runs its fuel, and that makes the lubrication count more, not less.
This is the one that fools people. Myth: "If it starts and drives, there's no harm done." Diesel in a petrol motor generally means a motor that will not run: the motorist stops, and so does the harm. Feed petrol to a diesel and it generally fires up, ticks over and drives away like nothing happened — all the while its pump wears. Fine and running aren't the same at all.
Myth: "Add some two-stroke oil and drive the car home." It's an outdated fix for a separate problem. None of what petrol thinned is put back by it — and afterwards, that tank still contains the petrol.
Once your engine has been run, part of that petrol is in the filter and your lines, not the tank — and your next start pulls it right back through the pump. So the myth "drain that tank yourself and you're sorted" doesn't hold. Emptying petrol into a can at the kerbside is also genuinely risky.
Why petrol in a diesel happens so easily
Carelessness is seldom the cause, and nobody means to do it. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol car at all. The forecourt makes it simple, and the mistake runs one way.
When habit and the vehicle stop matching, it happens. A new motor, a hire car or a courtesy car. Households running one of each, petrol and diesel. A forecourt you know, but with its pumps laid out differently. Filling up in a hurry on the way to Didcot Parkway, with a train to catch. Exactly the moment it occurs: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Throw in rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
Preventing petrol in a diesel next time you fill up in Steventon
- Read the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, yet not on every forecourt. The label is what counts.
- Plenty of motors state the fuel inside the filler flap or on the cap, and so check it on your first fill in any motor you do not know.
- Good intentions do less than a sticker or a fob in a bright colour on the diesel's key if a house has one of each. So label it.
- Before the nozzle comes off the petrol pump the first time you fuel a hired or new car, say "diesel" aloud. Daft, perhaps, yet it does the trick.
- 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.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to block a petrol nozzle, and add-on devices exist for the remainder. Treat it as a safety net, and keep checking the petrol pump.
- Less petrol makes a thinner mixture, and so stop the moment you realise — while remembering that your next step is unchanged. It is still not to start the car.
Petrol already in a diesel in Steventon? Start here
Short and simple, then, is the order of things. Don't turn your ignition on, and do not crank it. The staff on the forecourt — whether at BP itself or wherever you filled up — will usually help roll it clear of the pump if you ask. What was put in, about how much, and if it has run: tell us those when you call 0333 366 0103.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate fault — Steventon has a page just for it.
What makes one Steventon petrol in a diesel job cost more than the next
Four separate jobs lie behind the four situations above — which is why there's no fair single quote. What shifts your cost is chiefly which of them you're in. After that it's the proportion — how much petrol went in against how much the tank takes — and then where your car is and whether a van can get to it safely.
Before any quote, not after, come three queries: the fuel that got in, the amount, and whether it's run. That's why. Given those answers, you get a straight figure rather than a range.
About Steventon and its setting
Steventon is a village in Oxfordshire, situated on the banks of the River Thames at an elevation of around 64 metres. Steventon lies approximately 9 miles south of Oxford and 52 miles west of London, with nearby settlements including Milton Hill and Milton. Steventon has a population of around 1071 residents, predominantly living in semi-detached housing. Steventon remains a quiet riverside community with a strong sense of local identity.
Fuel drain cover in Steventon and across Oxfordshire
Petrol in diesel jobs around Steventon — part of the OX postcode area — go to teams that likewise cover the places about it, Milton Hill, Milton Heights and Milton included. A forecourt, a supermarket car park, a lay-by or your own drive are all spots our technicians drain, and the car doesn't need to move to us.
In Steventon and still at the pump?
Then you're in the best spot there is. Phone, and keep it switched off.