In order to investigate the safety issues of a fiber composite wrapped tank for automobile hydrogen on-board storage during the operation process, the modal tests of 0.074 m 3 fiber composite wrapped tanks are carried out. Using the dynamic parameters of the intact, slightly damaged, and fatigue-cracked tanks caused by repeated hydrogen filling, the feasibility of damage detection of fatigue cracks in fiber composite wrapped tanks is analyzed. The test results indicate that the localized fatigue cracks have some effects on the frequency responses of slightly damaged and fatigue-cracked tanks, but the effects are not significant. Therefore, the frequency response function cannot be used to detect the extent of damage or the crack location in a fiber composite wrapped tank. However, a method based on modal shape is a potential way to detect and locate possible damage. These test results and analyses provide guidance on the online damage detection of high-pressure hydrogen storage tanks in automobiles.