This reminds me of in college when I was in a team of students trying to solve the problem of pumping fluids in zero gravity. We ended up adding different metals to the fluids in order to use magnetic force to control the flow of the fluids. Eventually the metal bits tore apart the pump though
Anyone have a 5 gallon tank of gasoline or diesel hanging around? Take a magnet preferably a very strong one, tie it to a string dip it in there and shake up the container. Let the container settle, remove the magnet and search for anything it picked up. If there is anything at all it could be plausible, if there is nothing repeat with gas from different stations. My guess would be the highest likely-hood of finding something like this would be in diesel or kerosene considering it comes out of the refinery process first. Therefore it is put through less filters. Most likely this isn't going to prove anything but its worth a shot.
But most likely it wont work. Why? Because simply you are not doing anything to change the system. All you are doing is temporarily stopping magnetic bits (if any) from entering the injectors. As these metal bits build up eventually they will start being swept away by the flow of fuel in the system. If there were a filter of some sort that had to be changed, then that would make it more plausible. However, most of these systems are filter-less, so therefore they are probably useless. Just my thoughts
