Little Broughton: Petrol in a Diesel Car? How Worried to Be
If it has not been started, worry far less than you likely are. "Have I wrecked it?" is the first question anyone around Little Broughton asks, and the truthful answer is generally no, since petrol left in a diesel tank hurts nothing until it's dragged through the fuel system — by ignition priming, by the starter, or by being driven. Petrol in Diesel is who to call, with the motor left off, and so it remains that way. Keep reading 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 don't repeat it.
What petrol in a diesel does to your engine
Passing through a motor, diesel is doing two jobs at the same time. It lubricates first, and only then does it burn. What keeps the surfaces inside your high-pressure pump and the injectors from wearing down against each other is the diesel flowing through them — they are designed to very fine gaps.
Of those two jobs, petrol manages the first poorly and the second never. A pump running on a petrol mix is wearing itself out, because petrol is thinner than diesel and strips out the protection your fuel system depends on. Petrol is also made to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that is where the rattling comes.
The shape of the trouble is clear once you put those together. It is circulation that does the harm, not contact. A tank with petrol in it is a fuel problem. After your pump has been labouring on that petrol, a mechanical fault has started: whatever is shed by a pump that is wearing travels onward to the injectors with the fuel.
How serious is petrol in a diesel? Four situations our engineers see in Little Broughton
Fuelled, and never started: no case is better. The petrol is in the tank and just the tank, and the task is a drain and a flush where your car stands. This is the one situation that can only really take place on a forecourt, because anywhere else the vehicle has been driven to get there.
Ignition on, or started for a moment. Petrol has left your tank and got to your filter and the fuel lines, because the system has been primed. Drain, flush, deal with the filter: still usually easy.
Some miles driven, and the pump has spent each of them running on thinned fuel. Distance is only half of that; how hard it was driven counts equally. Either way the work includes your tank, your lines, the filter and fresh fuel through the entire circuit. Short trips, such as the school run to Broughton Primary School, are one thing. A run as far as Carlisle, under 50 miles away, is a very different task. So is any miles on the Southwaite Services Northbound, under 25 miles from Little Broughton, where the motor has been working hard throughout.
Driven until it complained. Knocking, a lumpy idle, smoke, a throttle that has gone soft. The fuel isn't behaving like diesel any more, and your motor is telling you. Stop on the spot — on the verge on Alice Lane, at the kerb, down a side road — and don't move it again. A car pulled over early very rarely has permanent damage, as the fuel drain and the flush, which still come first, sort it out.
Petrol in a diesel stories Little Broughton drivers hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. A fuller tank of the same mixture is all it gives, since topping up removes nothing. That guidance supposes a diesel fuel system handles petrol by percentage. It doesn't.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. Protection matters more on newer diesels, not less, since their fuel passes through more precise parts at higher pressure.
This is the one that fools motorists. Myth: "If it starts and drives, there is no damage done." Diesel in a petrol motor normally leaves a motor that won't run: the driver stops, and so does the damage. A diesel fed petrol normally starts, ticks over and drives away as though nothing has happened, while the pump grinds. Being able to run is not the same as being fine.
Myth: "Add some two-stroke oil and drive the car home." It's an old fix for a different problem. The petrol is still inside the tank afterwards, and what it has thinned is not put back.
If the motor has run, part of the petrol is in the filter and the lines, not the tank — and the next start pulls it straight back through your pump. So the myth "drain the tank yourself and you're sorted" does not stand up. Emptying petrol into a can at the roadside is also really dangerous.
How petrol ends up: petrol in a diesel
Nobody does it on purpose, and it's seldom carelessness. The petrol nozzle is the smaller of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol car at all. The forecourt makes it easy, and the error runs one way.
When routine and the car stop matching, it takes place. Any motor that's new to you — hired, on loan as a courtesy car, or brand new. Households running one of each, petrol and diesel. A familiar forecourt with the pumps in a different order. A train to catch, and a hurried fill en route to Maryport. Precisely the moment it takes place: after years of driving petrol, a driver fills a diesel Volkswagen Passat for the first time. The hand does what it has always done once you add rain, a phone call or a back seat full of kids.
Preventing petrol in a diesel next time you fill up around Little Broughton
- Check the pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on every forecourt. The label is what matters.
- The first fill in an unfamiliar vehicle is the time to check your filler flap — on it, or on the cap, plenty of motors state which fuel to use.
- Label the key. In a house with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember.
- "Diesel", aloud, before you lift the nozzle — every time a new or hired car gets its first tank. It seems silly. It works.
- Mistakes like this are straightforward to make while your mind is on something else, so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to reject a petrol nozzle, and add-on devices are available for the rest. Treat it as a safety net, then keep checking the petrol pump.
- Spotting it halfway? Stop at once. A weaker mixture follows from less petrol in your tank, yet your next step remains the same: do not start the car.
Put petrol in a diesel in Little Broughton already?
Then, there is only a short order of things. Leave it unstarted, with your ignition switched off as well. Still on the forecourt, at Essex Garage or anywhere else? Ask the staff to help you roll it clear of the pump. Ring 0333 366 0103 next, with three answers — your fuel, the rough volume, and if it's run.
If it was AdBlue and not petrol, say so. That's a separate fault — corrosion and deposits and not lost lubrication — and it has its own page for Little Broughton.
One petrol in a diesel job in Little Broughton costs more than another. Why?
The four scenarios above are four different jobs, so no single price for this would be fair. What shifts the cost is chiefly which of them you're in. Beyond that it's the ratio — how much petrol got in against how much that tank holds — and then where the car is and whether a van can reach it safely.
Three queries come first, before quoting, instead of after — what got in, how much, has it run — and this is the reason. Those answers turn a range into a straight figure.
About Little Broughton, for a moment
Little Broughton is a village situated on the riverside in Cumbria, with an elevation of 74 metres above sea level. Little Broughton lies approximately 25 miles from Carlisle and 258 miles from London, making it a relatively remote community. Little Broughton has a mix of housing types, but semi-detached homes are the most common, and it is near other small settlements like Great Broughton and Brigham.
Little Broughton and Cumbria: where our fuel drain cover runs
Little Broughton waits in the CA postcode area, and the vans that answer petrol in diesel jobs there work the spots near it as well — Great Broughton, Broughton Cross and Brigham among them. No need to bring your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations we drain.
In Little Broughton and still at the petrol pump?
Then, you couldn't be in a better position. Keep it off. Phone.