Barrows: Petrol in a Diesel Car? How Worried to Be
Not started? Then less worried than you likely are. Till the ignition primes your pump, the starter cranks, or your vehicle is driven, petrol in a diesel tank simply waits there and does no harm. Which means the honest reply to the first Barrows question — "have I wrecked it?" — normally no. To keep the vehicle like that, ring Petrol in Diesel and leave your engine switched off. 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 do it again.
What petrol in a diesel does to the motor
Passing through a motor, diesel does two things at once. Before it ignites, it protects — then it burns. Your high-pressure pump and your injectors are built to extremely fine clearances, and the diesel passing through them is what stops those surfaces from wearing down against each other.
The second job petrol doesn't do at all, and the first it does poorly. It is runnier than diesel and strips away the protection the fuel system hinges on, and so a pump running on a petrol mix is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the knocking comes from.
Put these together and the shape of the issue is plain. Not contact but circulation is what does the harm. All a tank with petrol in it amounts to is a fuel issue. The start of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds travels on with your fuel to your injectors downstream.
Barrows, petrol in a diesel: four cases, from mild to major
Filled up, never started. The best case there is. The petrol is in that tank and only your tank, and the task is a drain and a flush where the vehicle sits. This is the one situation that can only truly occur at a forecourt, as anywhere else the car has been driven to get there.
A moment's running, or merely your ignition on. Once primed, the system has pulled petrol out of the tank as far as the fuel filter and the fuel lines. That's normally still a straightforward task — a drain, a flush, and the filter seen to.
A couple of miles driven, and the pump has spent each of them running on diluted fuel. Mileage is only half of it; how hard it was driven matters just as much. Either way the work runs to the tank, your lines, your filter and fresh fuel through the whole circuit. On the school run to Cheddar First School, the mileage is small. Very different a second time: a run to Wells, under 10 miles away, or any miles on the M5, under 5 miles from Barrows, where the engine never stopped labouring hard.
Driven on until it protested — rattling, smoke, an uneven idle, a soft throttle. The fuel is not behaving like diesel any more, and the motor is saying so. Leave it where it stops: a lay-by, a quiet street, the verge on Barrow Park. A car pulled over quickly very seldom has permanent damage, since the fuel drain and the flush-through, which still go first, sort it out.
Petrol in a diesel myths Barrows motorists hear
Myth: topping up to full with diesel makes it fine. It doesn't. Topping up removes nothing; it gives you a fuller tank of the same mix. That advice supposes a diesel fuel system handles petrol by percentage. It doesn't.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. Lubrication counts more on current diesels, not less, because their fuel runs through finer parts at higher pressure.
Myth: "If it starts and drives, there's no damage done." This is the one that fools motorists. Any petrol engine fed diesel generally will not run, so the motorist stops and the damage stops with them. Whilst your pump grinds, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Fine and running are not the same thing.
An old workaround for a separate problem is behind this one. Myth: "Add some two-stroke oil and drive the car home." What petrol has diluted stays thinned, and the petrol stays in your tank anyway.
If the motor has been run, part of that petrol sits in the fuel filter and your lines, not that tank — and your next start pulls it right back through your pump. So the myth "drain that tank yourself and you are sorted" does not stand up. And, a can of petrol filled by the kerbside is truly risky.
Petrol in a diesel: how does it occur?
It is seldom carelessness, and nobody does it on purpose. A diesel nozzle mostly won't fit a petrol car, yet the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake easy, and just in one direction.
When habit and your car stop matching, it takes place. Hire cars, courtesy cars, and motors that are new to you. Households running one of each, petrol and diesel. Your ordinary forecourt, its pumps suddenly in a different order. A train to catch, and a hurried fill on the way to Worle. A new-to-you diesel Volkswagen Passat, its first fuelling, and a motorist used to petrol: exactly when it happens. Throw in rain, a phone call or a back seat full of kids, and the hand does what it has always done.
How to avoid petrol in a diesel at your next fill-up in Barrows
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most generally do. Check the pump's label; the colour is only a hint.
- Plenty of motors state the fuel inside the filler flap or on the cap, so check there on your first fill in any car you don't know.
- One of each in the home? Label your key to the diesel — a coloured fob, a sticker — since meaning to remember is not enough.
- "Diesel", out loud, before you lift the nozzle — each time a new or hired car gets its first tank. It seems silly. It does the trick.
- Tuck your phone away. This is an easy mistake to make while you are thinking about something else.
- Add-on devices are available for motors without one, and some diesels come with a filler that won't take a petrol nozzle. Helpful — but a safety net only, never a reason to stop checking the label.
- Spotting it mid-fill? Stop at once. A thinner mixture results from less petrol inside the tank, yet your next step remains the same: do not start the vehicle.
Petrol already in a diesel in Barrows? Begin here
Short and simple, then, is the order of things. Leave it unstarted, with the ignition off as well. The attendants on the forecourt — whether at Murco itself or wherever you filled up — will normally help push it away from the petrol pump if you ask. Then phone 0333 366 0103 and tell us what was put in, about how much, and if it's run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a different problem — Barrows has a page all for it.
Barrows petrol in a diesel jobs: why one costs more than another
The four situations above are four different tasks, so no single quote for this would be fair. Chiefly, your cost shifts with which one you're in. Beyond that it is the share — how much petrol went in against how much the tank takes — and after that where the car is and whether a van can get to it safely.
What got in, how much, and if it's run — three questions our technicians ask before costing, not after, for exactly that reason. Those answers change a range into a straight figure.
About Barrows itself
Barrows is a suburban area situated on the lakeside in Somerset, with a relatively low elevation of 22 metres. Barrows lies near several other small communities, including Hillfield and Hamfield, and is close to the historic city of Wells. Barrows has a population of around 3948 people, predominantly living in detached housing. Barrows is also within easy reach of the popular tourist destination of Cheddar.
Barrows and Somerset: where our fuel drain cover reaches
Our teams answering petrol in diesel jobs in Barrows, in the BS postcode area, equally work the locations near it, Hillfield, Hamfield and Cheddar among them. We drain where your car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
In Barrows and still at the petrol pump?
Nothing beats it: that's where you now are. Turned off it remains; then call.