67' rebuilding the mistress..

[jwodahl]

doing parts collection, and prep before i tear down the truck from running condition.. i have decided to keep the in-cab tank instead of doing the conversion to the spare tire well.. the one concern i have is i have been told that if these trucks happen to roll, gas will go all over the cab and driver.. my question is, is there any type of one-way valve that can be installed inline to where i can fill the tank, but not be concerned with fuel coming back out if some sort of accident were to occur.. thanks..