How Worried Should You Be? Petrol in a Diesel Car in Birchfield
Unstarted? Then less anxious than you probably are. "Have I wrecked it?" is the first thing anyone in Birchfield asks, and the honest answer is usually no, since petrol left in a diesel tank hurts nothing until it is dragged through your fuel system — by ignition priming, by your starter, or by driving. Petrol in Diesel is who to phone, with your engine left off, and so it remains that way. 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 never repeat it.
Petrol in a diesel: what does it do to the engine?
Passing through an engine, diesel is doing two jobs at once. Lubricating comes before burning; it does both. Designed to very fine clearances, the injectors and the pump depend on the diesel moving through them to stop their surfaces wearing against one another.
Petrol does the first task poorly and the second not at all. Being less viscous than diesel, petrol strips away the protection a fuel system needs, so a pump running on that mixture to wear itself. It's also made to resist igniting under compression — the reverse of what a diesel needs — which is where you hear the rattling.
The shape of the trouble is plain when you put those together. It is circulation that does the harm, not contact. Where that petrol is only inside that tank, it is a problem of fuel, nothing more. The start of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds moves on with your fuel to your injectors beyond it.
Birchfield, petrol in a diesel: four cases, from mild to significant
Filled up, never started. The best case there can be. Being on a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With that petrol kept inside your tank alone, it is cleared and flushed right where it stands, and nothing more is needed.
Your ignition switched on, or a brief start. With the fuel system primed, the fuel lines and filter already contain petrol that came from the tank. That's normally still an easy task — a drain, a flush, and the fuel filter seen to.
Driven a couple of miles. Now your pump has spent those miles labouring on weakened fuel. The work is the tank, the fuel lines, the filter and clean fuel through the whole circuit, and how hard the car was driven matters as much as how far. Driving the kids to Birchfield Primary School is one sort of trip. Any miles on the Aston Expressway, under a mile from Birchfield, means your engine working hard throughout, and a run to Birmingham, under 3 miles away, is a very different job as well.
Driven until it protested. Clattering, a ragged idle, smoke, a throttle that has gone soft. That is the motor telling you its fuel has stopped acting like diesel. Stop wherever you are — the verge on Trinity Road, a lay-by, a side street — then leave the car where it is. Permanent damage is very uncommon if a car is pulled over soon, and the fuel drain and flush-through that still come first deal with it.
What Birchfield drivers get told about petrol in a diesel — and the stories in it
False: topping up to full with diesel makes it fine. It does not. Topping up takes out nothing; it gives you a fuller tank of the same mixture. That advice presumes a diesel fuel system handles petrol by percentage. It does not.
Not so: a current diesel copes with a bit of petrol. Rather, the reverse. At higher pressure, through more precise parts: that's how a newer diesel handles its fuel, and so the protection counts more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that fools people. Any petrol engine fed diesel normally will not run, so the driver stops and the damage stops with them. Feed petrol to a diesel and it generally fires up, ticks over and drives away as if nothing happened — all while its pump wears. Fine and running are not the same thing.
An outdated fix for a separate fault is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." None of what petrol diluted is put back by it — and afterwards, that tank still contains the petrol.
The next start draws petrol back round the pump from the lines and the filter, where some of it sits after the motor has been run. That is why a DIY tank drain does not leave you sorted — a myth. It's also genuinely risky to drain petrol into a can by the roadside.
Why petrol in a diesel occurs so easily
On purpose? Never. Through carelessness? Rarely, if ever. The petrol nozzle is the smaller of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol vehicle at all. The forecourt makes it easy, and the slip runs one way.
The moment habit stops matching the vehicle is the moment it happens. A new vehicle, a hire car or a courtesy car. Two vehicles on one driveway, one petrol, one diesel. A well-known forecourt with the pumps in a different order. A train to catch, and a hurried fill en route to Perry Barr. Precisely the moment it occurs: after years of driving petrol, someone fills a diesel Volkswagen Tiguan for the first time. Your hand does what it has always done once you add rain, a phone call or a back seat full of kids.
Birchfield drivers: how to prevent petrol in a diesel next time
- The label is what counts, so read the petrol pump rather than the colour: in the UK unleaded handles are normally green and diesel black, yet not on every forecourt.
- The first fill in a new car is the time to check your filler flap — inside it, or on the cap, plenty of cars state the fuel to use.
- One of each in the household? Label the key to the diesel — a coloured fob, a sticker — because meaning to remember is not enough.
- It seems daft and it works: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Mistakes like this are straightforward to make whilst your mind is on something else, so the phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler built to block a petrol nozzle, and add-on devices are available for motors without one. They are a backstop, not a reason to stop checking the pump.
- Less petrol means a thinner blend, so stop the moment you notice — though remembering that your next step is unchanged. It is still not to crank it.
Petrol already in a diesel in Birchfield? Begin here
The order of things is brief, then. Never crank it, and don't switch the ignition on. Still at the forecourt, at Gulf or anywhere else? Ask the attendants to help you roll the vehicle away from the pump. Next, 0333 366 0103. We'll ask what went in, roughly how much, and if it has been run.
Say so if it was AdBlue instead of petrol: it is a different issue, with its own page for Birchfield, because AdBlue brings corrosion and deposits instead of lost lubrication.
Why one petrol in a diesel task around Birchfield costs more than another
Four separate tasks lie behind the four scenarios above — which is why there is no fair single quote. The situation itself does most of the work of moving the cost. Two things follow that: the petrol that went in as a share of what your tank takes, then the place your car is in and whether a technician can reach it safely.
What went in, how much, and if it's run — three queries we ask before costing, not after, for precisely that reason. Given those replies, there is a straight figure rather than a range.
About Birchfield, for a moment
Birchfield is a suburban area located near the centre of Birmingham, with a mix of terraced housing and local amenities. Birchfield sits at an elevation of around 110 metres, close to the nearby areas of Lozells, Aston, and Newtown. Birchfield is home to a diverse population of approximately 18,505 people, living in a range of predominantly terraced homes. Birchfield is situated about 2 miles from Birmingham city centre, making it a convenient location for commuters.
Birchfield and West Midlands: where our fuel drain cover reaches
Our teams answering petrol in diesel calls around Birchfield, in the B postcode area, equally work the locations near it, Lozells, Aston and Newtown included. The car doesn't need to move to us: our engineers drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
At the petrol pump around Birchfield, right now?
The best place there is, then — that is where you are. Switched off it remains; then ring.