You’re standing at the pump, nozzle in the tank, and your phone buzzes in your pocket. A text from your kid. A call from work. You glance at the red-and-white placard bolted to the pump — the one with the crossed-out cell phone — and you hesitate. Somewhere in the back of your mind sits a story you’ve heard a hundred times: phones can spark. Phones can ignite gasoline fumes. Phones can blow up gas stations.

It’s one of the most widely believed safety warnings in the world, posted on millions of pumps across the United States, Europe, Australia, Africa, and Asia. And it is, according to every major fire-safety authority that has ever investigated it, false.

Not “mostly harmless.” Not “unproven.” The claim that an ordinary cell phone can ignite gasoline vapor at a filling station has been tested by engineers, debunked by industry investigators, investigated by federal regulators, and literally blown up on television — and in more than 25 years of searching, nobody has ever found a single real-world case of it happening.

So where did the warning come from? Why do the signs still stand? And if phones aren’t starting pump fires, what is? This is the story of a rumor that outran the truth — and the genuine danger hiding behind it.

*The device in your pocket at the pump. Decades of safety investigations say it has never started a fire at a filling station.*

The claim

The warning usually reads something like this: “Turn off your cell phone. Do not use electronic devices while refueling. Mobile phones can ignite fuel or fumes.” Many signs lump phones in with cigarettes and open flames, as if a ringing handset were a pocket-sized blowtorch.

The fear behind the sign is specific and mechanical: a phone that rings, or lights up, or simply sits powered on near the nozzle, releases enough energy — a spark, a surge, a burst of radiation — to ignite the invisible cloud of gasoline vapor swirling around the fuel filler neck. One spark, the story goes, and the whole station goes up.

It sounds plausible because it borrows from something real. Gasoline vapor absolutely can be ignited by a spark. The minimum ignition energy of a gasoline-air mixture is tiny — roughly 0.2 millijoules, a whisper of energy. A static shock from a doorknob carries thousands of times more. So the logic runs: if a tiny spark can do it, surely a phone — a buzzing, glowing, radio-transmitting gadget — could do it too.

That logic collapsed the moment anyone actually tested it.

What the investigators found

The most thorough record belongs to the Petroleum Equipment Institute, the American trade association that tracks fires at filling stations. The PEI has compiled a database of refueling fire incidents stretching back decades — more than 150 documented cases of fires at the pump. Its finding, published on the institute’s own website: the PEI has “not documented a single incident that was caused by a cellular telephone.”

Zero. Out of every refueling fire ever investigated and logged, not one was started by a phone.

The U.S. Federal Communications Commission reached the same conclusion. The FCC investigated the claims and states on its official website that there is no documented evidence linking wireless equipment to fires at gas stations. Federal regulators, in other words, looked for the phone-caused pump fire and came back empty-handed.

Then came the television test. In 2003, the Discovery Channel show MythBusters sealed a cell phone inside a chamber filled with explosive gasoline vapors and forced it to ring over and over. The phone rang. The vapors sat there. Nothing happened. The show tested the scenario twice, in controlled conditions designed to give the myth every advantage — and the phone could not ignite the fumes either time. As Popular Science noted in a 2025 roundup of smartphone myths, “your smartphone can’t blow up a gas station,” citing both the PEI’s zero-incident record and the MythBusters result.

Australia’s transport safety investigators independently reached the same verdict. A report from the Australian Transport Safety Bureau examined fires that had been blamed on phones and found that, in the bureau’s words, “not one of these incidents was associated with telecommunication reporting.” The fires were real. The phones were innocent bystanders.

*The claim traveled the world in forwarded emails and social posts for years before investigators traced it back to its source — and found nothing there.*

The physics: why a phone can’t do it

Engineers who have studied the question say the numbers were never on the myth’s side. Electrical engineer Steve Fowler of Fowler Associates put it bluntly: “mobile phone signals are far too weak to ignite even explosive gasoline fumes.”

A phone communicates with nearby towers using radio waves at a fraction of a watt — typically around 0.5 watts of transmit power — and that energy radiates outward in all directions. It is not concentrated, it is not arcing, and it cannot heat anything to ignition temperature. The radio-frequency energy from a phone is, as Fowler explained, carried by a wave with “a discrete particle having zero rest mass, no electric charge and an indefinitely long lifetime” — it simply has no mechanism to start a fire.

The battery is no more threatening. Modern smartphones use sealed lithium-ion cells operating at just a few volts, wrapped in plastic housings that insulate the internals from the outside world. For a phone to produce an external spark, something catastrophic would have to happen first: the battery would need to be punctured, crushed, or torn open right next to the fuel vapors. Normal operation — ringing, texting, scrolling, even charging — generates no open spark at all.

Renowned Australian scientist Dr. Karl Kruszelnicki, examining the claim in 2006, called ignition by a phone “theoretically possible” — then explained why the theory stays theoretical. The energy required to ignite petrol vapor, he calculated, is roughly one five-millionth of the energy stored in a fully charged phone battery. But that energy would have to be released in a single, concentrated spark, and a phone’s sealed, low-voltage electronics have no way to deliver it. Even if the internal electronics failed outright, he concluded, any resulting spark would still be too small to start a fire.

Michael Marando of the National Fire Protection Association gave the most honest summary of the residual risk in a 2022 interview with USA Today: “For me to say there’s no risk, I can’t really do that, because there could be some really, really one-in-a-several billion chance that it could possibly happen. There’s just too many factors that have to line up that it’s extraordinarily rare.”

One in several billion. That is the safety community’s considered estimate of the risk — so close to zero that no incident has ever been observed.

*Modern phones are sealed, low-voltage devices. Their electronics have no way to produce the kind of spark the myth imagines.*

How a rumor became a warning sign

If phones have never caused a pump fire, how did the belief become so universal that it ended up printed on signs at millions of stations? The answer is one of the internet’s oldest and most successful email hoaxes.

The story began circulating in 1999 as a forwarded email with the ominous subject line “A warning for Woman.” It claimed that Shell Oil had issued an urgent warning after three incidents in which mobile phones ignited fuel vapors during refueling: in one, a phone left on a car’s trunk lid rang and the resulting fire destroyed the car and the pump; in another, a driver suffered severe burns to the face answering a call while fueling; in a third, a phone ringing in a pocket ignited vapors and burned the victim’s thigh and groin. The email closed with four “Rules for Safe Refueling,” including “Don’t use your cell phone — leave it inside the vehicle or turn it off,” and cited a real person — Bob Renkes of the Petroleum Equipment Institute — as if he endorsed the phone warning.

Renkes did endorse part of the email — but not the part about phones. He was, at the time, running a campaign about the genuine danger of static electricity at gas pumps, and the hoax had grafted his real research onto a fabricated phone warning. The three Shell incidents never happened. Shell spokesperson Stephanie Johnson later confirmed that no such incidents were reported to the company and that Shell had never issued such a warning.

A second wave arrived in 2002 with a fresh version of the same email, and a third strain told of a man in Indonesia severely burned when he answered his phone while refueling. A National Public Radio reporter tracked down the journalist behind that story. As Renkes later recounted, the original article had been written third-hand — and it was the reporter’s first published article. Investigators, in his words, “never could find any actual report of an accident.”

So why did phone manufacturers and gas stations start posting warnings anyway? Here the story takes an ironic turn. According to Nokia spokesman Keith Nowak, British law requires the manual of any battery-operated device — from flashlights to radios — to carry a warning against use at petrol stations. Phones, being battery-operated devices, got the warning printed in their manuals by default. When gasoline companies saw the warnings in phone manuals, Renkes explained, they simply followed suit and began posting the same warnings at their pumps. A legal boilerplate written for every battery-powered gadget on earth became, through corporate imitation, “evidence” that phones were uniquely dangerous at the pump.

The University of Washington’s vehicle fire research database summarizes the episode dryly: the PEI “dispels the myth that cell phones cause fires while refueling. It was dismissed as an email hoax.”

*A phone's circuit board carries tiny currents at a few volts — orders of magnitude below what it takes to ignite fuel vapor.*

The real fire starter: static electricity

Here is the twist the hoax accidentally got right: fires at gas pumps are real, they are frightening, and they do happen. They’re just caused by something the email barely mentioned — static electricity from your own body.

The mechanism is simple. When you slide out of your car, your clothing rubs against the fabric of the seat, building up a static electrical charge on your body — the same charge that makes a balloon stick to a wall or a doorknob shock you in winter. If you then reach for the metal fuel nozzle or the filler neck without discharging that charge, a spark can jump from your hand to the metal. And it jumps in exactly the wrong place: right where concentrated gasoline vapors are escaping from the tank opening.

The PEI’s investigation of more than 150 such fires found a strikingly consistent pattern. Nearly every case involved the driver getting back into the vehicle while the nozzle was still pumping — to escape the cold, to check a phone, to grab something from the bag — then returning to the pump and reaching for the nozzle. The re-entry rebuilt the static charge on the seat fabric; the return to the nozzle discharged it into the vapor zone. Cool, dry weather made it worse. Rubber-soled shoes, which insulate the body and prevent the charge from draining away, showed up again and again.

This is where the phone re-enters the story — not as the spark, but as the reason people move. The phone in your pocket gives you a reason to climb back into the car mid-fill to answer a call, to shift in your seat, to fidget — every one of those movements rebuilding the static charge that actually causes the fires. As one safety analysis put it, studies of the PEI’s flash-fire database consistently show that re-entering the vehicle during fueling is the single most common precursor to a static discharge ignition. The phone isn’t the igniter. It’s often the motivation behind the movement that creates the igniter.

The American Petroleum Institute’s actual safety guidance reflects this. Its refueling rules emphasize: turn off the engine, don’t smoke, don’t re-enter the vehicle during fueling — and if you must get back in, discharge the static by touching a bare-metal part of the car body before you touch the nozzle. If a static fire does start at the filler neck, the guidance is counterintuitive but critical: leave the nozzle in place, back away, and let the station’s emergency shutoff do its work.

Why the signs never came down

If the science has been settled for two decades, why does nearly every pump on earth still warn you about your phone? The reasons are a mix of caution, liability, and inertia — and one of them is more reasonable than the myth-busters like to admit.

First, the precautionary principle. Gas stations handle an extremely flammable product in a public space, and their safety culture is built on eliminating even theoretical risks. BP Australia’s website offers the industry’s candid version: if you drop your phone and the battery is knocked loose, the thinking goes, a spark could theoretically be produced near flammable vapors. The chance is, in the industry’s own telling, minuscule — but “petrol stations are on the side of caution,” as one Australian forecourt representative put it. When the cost of being wrong is a fireball, even a one-in-several-billion risk gets a sign.

Second, regulatory and legal inertia. Once warnings are printed in manuals, posted on pumps, and written into safety training, removing them creates a liability question no company’s lawyers want to answer. The sign stays because taking it down would require someone to formally declare the risk nonexistent — and as the NFPA’s Marando noted, no safety professional will say the risk is literally zero.

Third — and this one is legitimate — distraction. The National Association of Convenience and Fuel Retailing has documented incidents in which drivers distracted by their phones drove away with the fuel nozzle still locked into their vehicle, ripping hoses off pumps and damaging cars. A driver staring at a screen is also a driver who might overfill the tank, spill fuel on themselves, or fail to notice a problem. The phone at the pump is genuinely dangerous — just not for the reason the sign says. It’s dangerous the way a phone anywhere near a two-ton vehicle and a flammable liquid is dangerous: it steals your attention.

In that sense, the warning signs accidentally do useful work. They keep people present and alert during the thirty seconds of refueling. They just do it by telling a story that isn’t true.

*Igniting fuel takes a serious release of energy — the kind a rocket engine produces, not the kind a ringing phone can.*

The Verdict

False. The claim that using a cell phone at a gas station can ignite fuel vapors and cause a fire has no documented real-world case behind it, and every formal investigation has come back negative.

The key evidence:

• The Petroleum Equipment Institute, which maintains the most comprehensive database of refueling fires — more than 150 investigated incidents — states it has “not documented a single incident that was caused by a cellular telephone.”
• The FCC investigated the claims and found no documented evidence linking wireless equipment to gas station fires.
• MythBusters (2003) sealed a ringing phone in a chamber of explosive gasoline vapor, twice, under controlled conditions — and could not produce an ignition.
• Australia’s Transport Safety Bureau reviewed fires blamed on phones and found that “not one of these incidents was associated with telecommunication reporting.”
• The physics doesn’t work. Phone radio signals transmit at a fraction of a watt with no mechanism to create a spark; sealed low-voltage batteries cannot produce an external arc during normal use. Engineers and the NFPA put the residual risk at roughly one in several billion — effectively zero.
• The origin is a hoax. The “three Shell incidents” came from a 1999 forwarded email; Shell confirmed the incidents never happened and it never issued the warning. The pump placards trace back to boilerplate warnings legally required in battery-device manuals, which gas companies copied.

The genuine danger at the pump is static electricity from your own body — built up by sliding across the car seat, especially in cool, dry weather, and discharged when you reach for the nozzle after climbing back into the car. The phone’s real role in pump fires is indirect: it gives you a reason to get back in the car, which is the single most common precursor to a static-ignition fire.

The kicker

So the next time your phone buzzes at the pump, here’s the honest safety briefing, stripped of the myth: answering it will not blow up the station. No fire investigator, no federal regulator, and no television explosion-enthusiast has ever managed to make that happen, and the rumor that says otherwise was born in a chain email in 1999.

But put the phone away anyway. Stay outside your vehicle until the tank is full. If you absolutely must climb back in — the weather is miserable, the kids are fighting — touch a bare-metal part of the car body before your hand goes anywhere near the nozzle, and let that invisible static charge drain off into the steel. Don’t smoke, don’t overfill, and don’t drive off with the nozzle still in the tank.

The sign on the pump told you the wrong story for the right reason: pay attention at the pump. Just know that the thing that can actually hurt you isn’t the phone in your hand — it’s the charge on your sweater.