Sugar in the gass tank, from [Archive] - Team Camaro Tech

: Sugar in the gass tank, from

Joe Harrison
Sep 23rd, 04, 06:09 AM
Sweet Revenge

Legend: Putting sugar in the gas tank will ruin a vehicle's engine.

Status: False.

Origins: Judging from the entries made on one police blotter after another, cars around the nation are having their gas tanks sugared by those whom their owners have displeased. Why is this happening? Because, according to widespread belief, sugar poured into a gas tank will turn into a poor man's version of liquid cement and quickly render the vehicle's engine unfit for anything but a junkyard. In theory, the sugar dissolves into the gasoline, then travels along the fuel lines into the engine, where the heat of the vehicle's operations melts the sweetener into a dense sludge that gets into every nook and cranny of the engine. The sucrosed engine seizes and halts the vehicle in its tracks, but the real damage comes when the engine cools and the sludge hardens to rock-like consistency. Only the replacement of the entire engine will render the car fit for use again, says popular wisdom; otherwise, it's kiss your jalopy goodbye.

It is for such reason that this theory is so fervently cherished it appears to grant, for the price of a 5 lb. bag of sugar, the ability to effect great and irreparable harm to an adversary's most prized possession. The touted mode of vengeance is both inexpensive and easy to carry out, a combination that seems to put the power of getting even into the hands of anyone, no matter how disadvantaged.

However, revenge fantasies aside, this snippet of popular lore turns out not to be the sure and deadly car killer the retribution-minded would want to believe it is. As with many grand schemes, it lives more vividly in its imagining than in reality.

Sugar doesn't dissolve in gasoline, as a researcher at Berkeley confirmed in 1994. Forensics professor John Thornton labeled sucrose with radioactive carbon atoms and mixed it with gasoline, then spun the concoction in a centrifuge. After the undissolved particles were removed, the liquid's radiation level was measured to determine how much sucrose had become part of the gasoline. The answer was extremely little: the equivalent of less than a teaspoonful per 15-gallon tank of gas.

Because sugar doesn't dissolve in automotive fuel, it doesn't carmelize, and so it does not turn into the debilitating gunk this well-known entry in the revenge canon calls for.

Instead, sugar poured into a car's gas tank stays intact. While sugar could still cause harm if it reached the engine (but in the same way sand would, by virtue of its being a granular contaminant, not because the sugar would turn into a syrup), even that potential harm is generally prevented by filtration. At the end of the pickup tube in the gas tank is a "sock" that blocks solid materials, so the fuel gets through, but precious little that's not liquid does. Further up the line is the fuel filter, and what may have got through the "sock" does not get past it.

Yet, even though the sugar will not reach the engine in either syrup or solid state, it can clog the fuel filter or the fuel injectors, a circumstance which could stop a car. A little sugar in the tank could be dealt with by no more than having to change the fuel filter a few times, but a heavier sugaring would require the gas tank be removed from the car and dumped out. Tom and Ray Magliozzi (the hosts of radio's Car Talk) say it's not a big job for a good mechanic to drop the tank and clean it out; the process would likely cost the car's owner somewhere between $100 and $200. Though $100 to $200 is an appreciable sum, it is a far cry from the wished-for outcome of forcing the victim to have to replace the engine or scrap the car.

Ironically, there may soon come a day when each of us happily puts sugar in our gas tanks. In 2002 researchers at the University of Wisconsin at Madison happened upon a relatively easy way to extract hydrogen from a glucose solution: heat the sugar solution to 392F and pass it over a platinum-based catalyst to break it down into hydrogen and carbon dioxide. The resultant hydrogen could then be directed into a fuel cell that would power a car, with the carbon dioxide released into the atmosphere.

The potential for using sugar to fuel cars doesn't end with the notion of using the hydrogen extracted from glucose solutions. In 2004 researchers at Sandia National Labs began applying for patents covering ways to convert the glucose itself into energy, with an eye to using the sugar itself as a fuel source.

Yet the science of the matter aside, we expect reports of sugared gas tanks to continue to appear on police blotters everywhere for as long as gasoline engines power cars. The desire for revenge runs strong so strong that it will not let such a little thing as facts get in its way.

Accordingly, the best way to gain revenge on someone through the "sugar in the gas tank" prank might be to simply play on the belief rather than the reality just sprinkle a fair amount of sugar on the ground beneath the opening to the fuel tank of your victim's car and leave an empty sugar sack in a conspicious spot near the vehicle. Then sit back and watch your victim go wild trying to figure out how to deal with all that sugar he assumes is now in his gas tank.

Barbara "domino sugar theory" Mikkelson

Sightings: This particular revenge scheme has been imortalized in Less Than Jake's 1996 "Sugar in Your Gas Tank" and has appeared in the 1996 film Kingpin.

Vintage 68
Sep 23rd, 04, 07:22 AM
I agree that it doesn't get into the engine and turn it into a frozen molasses hulk - but it does clog up every filter you put in the car until you drop the tank and get the stuff out...
We'll just file this under - 'been there, done that' graemlins/angry.gif (and don't pi$$ off guys that work in supermarkets - but, I really am sorry about what happened to his car ;) )

Sep 23rd, 04, 07:24 AM
I had sugar put in the gas tank of a motorcycle I once owned, and I can attest to the fact that it quit running, and everything had to come apart to be cleaned.

Sep 23rd, 04, 09:38 AM
What would powdered sugar do? Seems like that would find its way through the fuel system easier than larger granules would.

Sep 23rd, 04, 10:02 AM
Sorry but my car is heavy enough already, it prefers Nutrasweet.

I know by way of a friend that a Craftsman riding mower won't run on Roundup concentrate.

Sep 23rd, 04, 11:10 AM
This myth was tested on the TLC/Discovery show Mythbusters ( . They poured several different things into the gas tank of a car to test the effects. They were unable to get the car to stop running using just sugar. In their words...."Myth Busted!"

Sep 23rd, 04, 01:44 PM
Somebody did post once about somebody else putting sugar in the oil AND that it didn't take no time to melt after the oil got hot and carbonize and screw everything up big time!!


Sep 23rd, 04, 01:55 PM
Originally posted by rojo:
I know by way of a friend that a Craftsman riding mower won't run on Roundup concentrate. But man will they fly with a tank of C16.

Sep 23rd, 04, 04:00 PM
Only thing I can add, is that I was on the receiving end of a gas tank "additive". I don't know what he put in my gas tank, but it ruined 3 new carburetors and corroded the fuel lines even after I drained the tank. I took a sample and saved it in a Mason jar. It smelled like pool acid and gas. There was access to pool acid at this house. After a week in the jar the lid became obviousley corroded and after 2 weeks had eaten through the metal top. The car never ran again. I ended up selling it to the wrecking yard.
No biggie as it was a F*rd.
I don't advocate vengeance, but I later determined who it was, and dropped a few 5\16" bolts into the intake and valve ports of his freshly rebuilt 460. I was patient and helped him put the motor in. He fired it up and it was all I could do to contain myself as his motor came apart. I wish I knew what exactly he put in my fuel tank, because it killed my car.
What comes around... goes around.

Sep 23rd, 04, 09:10 PM
Man you guys are mean :eek: :D

Scooby Doo
Sep 24th, 04, 07:47 AM
Originally posted by rcatalano:
This myth was tested on the TLC/Discovery show Mythbusters ( . They poured several different things into the gas tank of a car to test the effects. They were unable to get the car to stop running using just sugar. In their words...."Myth Busted!" Those have got to be the biggest idiots on TV. I don't hold faith in any of their experiments.


Sep 24th, 04, 08:48 AM
During WWII, experiments were done to determine what the French underground could use to sabotage German machinery. It was found that ground up walnut shells in the crankcase caused the most damage.

Sep 24th, 04, 03:45 PM
383, may have been bleach, takes a lot to mess with the engine, but a couple cups full mixed in overnight will destroy the gastank and fuel lines.

Sep 25th, 04, 05:20 AM
Muratic Acid will do what you described and is comonly used in swimming pools. I left a quart of muratic acid open sitting on my work bench and my new uncoated floor pans were on a shelf 10' away and within 2 days they were solid rust.

Sep 25th, 04, 10:26 AM
Makes sense that it was muriatic acid as we had a pool. I had a locking gas cap on the car, and that was the give away. Someone had access to my keys, like the roommate. Ever since I have had locking gas caps. The roomate and I parted ways shortly after that, and I heard through the vine that he never figured out what happened to his engine. Don't get mad.... get even.