Failsafes are a must-have for nitro powered r/c cars, boats, etc. I have used the electronic failsafes, which do a good job, but lately have decided to stick with a throttle return spring which works as well at a fraction of the cost.......... I can assume the only real reasons for the two loops in the tank pressure line is to keep any unwanted particles from blowing directly into your tank and to keep excess fuel from flowing directly from the tank into the pipe when you overfill the tank as we often do during quick pit stops for fuel when racing..........