The TV version with that big galoot as Reacher was much more believable.
Some vehicles do cut power to the fuel pump when the airbags deploy. For example: https://www.fordservicecontent.com/Ford_Content/vdirsnet/OwnerManual/Home/Content?variantid=3751&languageCode=en&countryCode=USA&Uid=G1765079&ProcUid=G1765080&userMarket=ZAF&div=f&buildtype=web